236 files changed, 15396 insertions, 25 deletions

diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 0000000..f1bb6b3
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1,4 @@
+Author:
+
+David Robillard <d@drobilla.net>
+
diff --git a/COPYING b/COPYING
index a4147d2..94a9ed0 100644
--- a/COPYING
+++ b/COPYING
@@ -1,25 +1,674 @@
-Redistribution and use in source and binary forms, with or without
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-are met:
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+
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+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/INSTALL b/INSTALL
new file mode 100644
index 0000000..623cddd
--- /dev/null
+++ b/INSTALL
@@ -0,0 +1,59 @@
+Installation Instructions
+=========================
+
+Basic Installation
+------------------
+
+Building this software requires only Python.  To install with default options:
+
+    ./waf configure
+    ./waf
+    ./waf install
+
+You may need to become root for the install stage, for example:
+
+    sudo ./waf install
+
+Configuration Options
+---------------------
+
+All supported options can be viewed using the command:
+
+    ./waf --help
+
+Most options only need to be passed during the configure stage, for example:
+
+    ./waf configure --prefix=/usr
+    ./waf
+    ./waf install
+
+Compiler Configuration
+----------------------
+
+Several standard environment variables can be used to control how compilers are
+invoked:
+
+ * CC:        Path to C compiler
+ * CFLAGS:    C compiler options
+ * CXX:       Path to C++ compiler
+ * CXXFLAGS:  C++ compiler options
+ * CPPFLAGS:  C preprocessor options
+ * LINKFLAGS: Linker options
+
+Installation Directories
+------------------------
+
+The --prefix option (or the PREFIX environment variable) can be used to change
+the prefix which all files are installed under.  There are also several options
+allowing for more fine-tuned control, see the --help output for details.
+
+Packaging
+---------
+
+Everything can be installed to a specific root directory by passing a --destdir
+option to the install stage (or setting the DESTDIR environment variable),
+which adds a prefix to all install paths.  For example:
+
+    ./waf configure --prefix=/usr
+    ./waf
+    ./waf install --destdir=/tmp/package
diff --git a/NEWS b/NEWS
new file mode 100644
index 0000000..4abfd45
--- /dev/null
+++ b/NEWS
@@ -0,0 +1,58 @@
+ganv (1.4.3) unstable;
+
+  * Fix positioning of embedded widgets when changing layout.
+  * Fix port position on modules with embedded widgets.
+  * Fix unexpected node jumping when dragging new connections.
+  * Preserve selection for quickly making several connections.
+  * Dampen sprung layout energy over time to prevent oscillation.
+  * Add support for edges that do not constrain the layout.
+  * Distinguish edge color from port color slighly.
+  * Highlight connected edges on port hover.
+  * Add support for PDF and PS export.
+  * Improve text rendering at high zoom.
+  * Improve appearance of graphs with circle nodes.
+  * Improve update performance.
+  * Add API to specify module port order.
+  * Add support for beveled box corners.
+  * Fix various minor visual alignment/sizing issues.
+  * Fix size of vertical flow modules.
+  * Fix compilation with --no-fdgl (patch from Vlad Glagolev).
+  * Fix crash when destroying canvas.
+  * Upgrade to waf 1.8.14
+
+ -- David Robillard <d@drobilla.net>  Fri, 14 Oct 2016 18:55:26 -0400
+
+ganv (1.4.2) stable;
+
+  * Fix bug where edges would not update when nodes are moved after the canvas
+    is cleared (fix stuck connections in Patchage after refresh).
+  * Upgrade to waf 1.7.16
+
+ -- David Robillard <d@drobilla.net>  Fri, 08 Aug 2014 18:24:33 -0400
+
+ganv (1.4.0) stable;
+
+  * Begin using library and pkg-config names suitable for parallel
+    installation.  This version of flowcanvas is flowcanvas-1 and is
+    NOT compatible with previous versions
+  * Clean up API and improve documentation.
+  * Add font size API
+  * Use system theme font size by default
+  * Size empty ports in font based units so they look right when zoomed
+  * Adjust padding and placement to precisely fit text
+  * Add ability to select connections directly
+  * Add Connection::set_curved()
+  * Fix lingering handle when deleting connections
+  * Dramatically increase performance by rendering text manually
+    rather than using the truly awful Gnome::Canvas::Text.
+  * Remove use of boost smart pointers.  Adding and removing from containers
+    (e.g. Canvas, Module) is now done automatically.
+  * Clean up API/ABI by hiding private implementations.
+  * Add ability to select connections by their handles, either individually
+    or in groups with rect select.
+  * Further slight improvements in memory consumption and alignment.
+  * Improve scalability to graphs with many connections (eliminate linear
+    connection searches and redundant connection collections).
+  * Switch to GPLv3+
+
+ -- David Robillard <d@drobilla.net>  Sun, 27 Apr 2014 23:44:29 -0400
diff --git a/README b/README
new file mode 100644
index 0000000..f167deb
--- /dev/null
+++ b/README
@@ -0,0 +1,14 @@
+Ganv
+====
+
+Ganv is an interactive Gtk canvas widget for graph-based interfaces (patchers,
+modular synthesizers, finite state automata, interactive graphs, etc).
+For more information, see <http://drobilla.net/software/ganv>.
+
+Ganv provides classes for "Modules" (boxes with "Ports"), Circles, and
+Edges (lines that connect either Ports or Circles).  The user can rearrange
+items, or Ganv can automatically arrange items using GraphViz.  Edges can
+be made by the user one at a time with the mouse, or in groups using the mouse
+and keyboard.
+
+ -- David Robillard <d@drobilla.net>
diff --git a/ganv.pc.in b/ganv.pc.in
new file mode 100644
index 0000000..3edf190
--- /dev/null
+++ b/ganv.pc.in
@@ -0,0 +1,11 @@
+prefix=@PREFIX@
+exec_prefix=@EXEC_PREFIX@
+libdir=@LIBDIR@
+includedir=@INCLUDEDIR@
+
+Name: ganv
+Version: @GANV_VERSION@
+Description: A Gtk canvas widget for graph based interfaces
+Requires: gtk+-2.0
+Libs: -L${libdir} -l@LIB_GANV@
+Cflags: -I${includedir}/ganv-@GANV_MAJOR_VERSION@
diff --git a/ganv/Box.hpp b/ganv/Box.hpp
new file mode 100644
index 0000000..1b95859
--- /dev/null
+++ b/ganv/Box.hpp
@@ -0,0 +1,50 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_BOX_HPP
+#define GANV_BOX_HPP
+
+#include "ganv/Node.hpp"
+#include "ganv/box.h"
+
+namespace Ganv {
+
+class Box : public Node
+{
+public:
+	Box(Canvas* canvas, GanvBox* gobj)
+		: Node(canvas, GANV_NODE(gobj))
+	{}
+
+	RW_PROPERTY(const char*, label)
+	RW_PROPERTY(gboolean, beveled)
+
+	METHODRET0(ganv_box, double, get_x1)
+	METHODRET0(ganv_box, double, get_y1)
+	METHODRET0(ganv_box, double, get_x2)
+	METHODRET0(ganv_box, double, get_y2)
+	METHODRET0(ganv_box, double, get_width)
+	METHOD1(ganv_box, set_width, double, width)
+	METHODRET0(ganv_box, double, get_height)
+	METHOD1(ganv_box, set_height, double, height)
+	METHODRET0(ganv_box, double, get_border_width)
+
+	GanvBox*       gobj()       { return GANV_BOX(_gobj); }
+	const GanvBox* gobj() const { return GANV_BOX(_gobj); }
+};
+
+} // namespace Ganv
+
+#endif // GANV_BOX_HPP
diff --git a/ganv/Canvas.hpp b/ganv/Canvas.hpp
new file mode 100644
index 0000000..8db1f66
--- /dev/null
+++ b/ganv/Canvas.hpp
@@ -0,0 +1,158 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_CANVAS_HPP
+#define GANV_CANVAS_HPP
+
+#include <string>
+
+#include <glib.h>
+#include <glibmm.h>
+#include <gtkmm/layout.h>
+
+#include "ganv/canvas.h"
+#include "ganv/wrap.hpp"
+
+/** Ganv namespace, everything is defined under this.
+ *
+ * @ingroup Ganv
+ */
+namespace Ganv {
+
+class Edge;
+class Item;
+class Node;
+class Port;
+
+/** @defgroup Ganv Ganv
+ *
+ * A canvas widget for graph-like UIs.
+ */
+
+/** The 'master' canvas widget which contains all other objects.
+ *
+ * Applications must override some virtual methods to make the widget actually
+ * do anything (e.g. connect).
+ *
+ * @ingroup Ganv
+ */
+class Canvas
+{
+public:
+	Canvas(double width, double height);
+	virtual	~Canvas();
+
+	GanvItem* root() { return ganv_canvas_root(gobj()); }
+
+	METHOD0(ganv_canvas, clear);
+	METHODRET0(ganv_canvas, gboolean, empty)
+	METHOD2(ganv_canvas, resize, double, width, double, height);
+	METHOD4(ganv_canvas, set_scroll_region, double, x1, double, y1, double, x2, double, y2);
+	METHOD4(ganv_canvas, get_scroll_region, double*, x1, double*, y1, double*, x2, double*, y2);
+	METHOD1(ganv_canvas, set_center_scroll_region, gboolean, c);
+	METHODRET0(ganv_canvas, gboolean, get_center_scroll_region);
+	METHOD2(ganv_canvas, scroll_to, int, x, int, y);
+
+	void get_scroll_offsets(int& cx, int& cy) const {
+		ganv_canvas_get_scroll_offsets(gobj(), &cx, &cy);
+	}
+
+	METHOD1(ganv_canvas, w2c_affine, cairo_matrix_t*, matrix);
+	METHOD4(ganv_canvas, w2c, double, wx, double, wy, int*, cx, int*, cy);
+	METHOD4(ganv_canvas, w2c_d, double, wx, double, wy, double*, cx, double*, cy);
+	METHOD4(ganv_canvas, c2w, int, cx, int, cy, double*, wx, double*, wy);
+	METHOD4(ganv_canvas, window_to_world, double, winx, double, winy, double*, worldx, double*, worldy);
+	METHOD4(ganv_canvas, world_to_window, double, worldx, double, worldy, double*, winx, double*, winy);
+
+	Item* get_item_at(double x, double y) const;
+	Edge* get_edge(Node* tail, Node* head) const;
+	void  remove_edge_between(Node* tail, Node* head);
+	void  remove_edge(Edge* edge);
+
+	METHOD0(ganv_canvas, arrange);
+	METHODRET2(ganv_canvas, int, export_image, const char*, filename, bool, draw_background);
+	METHOD1(ganv_canvas, export_dot, const char*, filename);
+	METHODRET0(ganv_canvas, gboolean, supports_sprung_layout);
+	METHODRET1(ganv_canvas, gboolean, set_sprung_layout, gboolean, sprung_layout);
+	METHOD2(ganv_canvas, for_each_node, GanvNodeFunc, f, void*, data)
+	METHOD2(ganv_canvas, for_each_selected_node, GanvNodeFunc, f, void*, data)
+	METHOD2(ganv_canvas, for_each_edge, GanvEdgeFunc, f, void*, data)
+	METHOD3(ganv_canvas, for_each_edge_from,
+	        const GanvNode*, tail,
+	        GanvEdgeFunc, f,
+	        void*, data);
+	METHOD3(ganv_canvas, for_each_edge_to,
+	        const GanvNode*, head,
+	        GanvEdgeFunc, f,
+	        void*, data);
+	METHOD3(ganv_canvas, for_each_edge_on,
+	        const GanvNode*, node,
+	        GanvEdgeFunc, f,
+	        void*, data);
+	METHOD2(ganv_canvas, for_each_selected_edge, GanvEdgeFunc, f, void*, data)
+
+	METHOD0(ganv_canvas, select_all);
+	METHOD0(ganv_canvas, clear_selection);
+	METHODRET0(ganv_canvas, double, get_zoom);
+	METHOD1(ganv_canvas, set_zoom, double, pix_per_unit);
+	METHOD0(ganv_canvas, zoom_full);
+	METHODRET0(ganv_canvas, double, get_default_font_size)
+	METHODRET0(ganv_canvas, double, get_font_size)
+	METHOD1(ganv_canvas, set_font_size, double, points);
+	METHOD0(ganv_canvas, get_move_cursor);
+	METHOD2(ganv_canvas, move_contents_to, double, x, double, y);
+
+	RW_PROPERTY(gboolean, locked)
+	RW_PROPERTY(double, width)
+	RW_PROPERTY(double, height)
+	RW_PROPERTY(GanvDirection, direction)
+
+	void set_port_order(GanvPortOrderFunc port_cmp, void* data) {
+		ganv_canvas_set_port_order(gobj(), port_cmp, data);
+	}
+
+	Gtk::Layout& widget() {
+		return *Glib::wrap(&_gobj->layout);
+	}
+
+	GQuark wrapper_key();
+
+	GanvCanvas*       gobj()       { return GANV_CANVAS(_gobj); }
+	const GanvCanvas* gobj() const { return GANV_CANVAS(_gobj); }
+
+	sigc::signal<bool, GdkEvent*>    signal_event;
+	sigc::signal<void, Node*, Node*> signal_connect;
+	sigc::signal<void, Node*, Node*> signal_disconnect;
+
+private:
+	Canvas(const Canvas&);  ///< Noncopyable
+	const Canvas& operator=(const Canvas&);  ///< Noncopyable
+
+	GanvCanvas* const _gobj;
+};
+
+} // namespace Ganv
+
+namespace Glib {
+
+static inline Ganv::Canvas*
+wrap(GanvCanvas* canvas)
+{
+	return (Ganv::Canvas*)ganv_canvas_get_wrapper(canvas);
+}
+
+} // namespace Glib
+
+#endif // GANV_CANVAS_HPP
diff --git a/ganv/Circle.hpp b/ganv/Circle.hpp
new file mode 100644
index 0000000..ab47669
--- /dev/null
+++ b/ganv/Circle.hpp
@@ -0,0 +1,79 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2013 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_CIRCLE_HPP
+#define GANV_CIRCLE_HPP
+
+#include <algorithm>
+#include <map>
+#include <string>
+#include <stdint.h>
+
+#include <gdkmm/types.h>
+
+#include "ganv/types.hpp"
+#include "ganv/Node.hpp"
+#include "ganv/circle.h"
+
+GANV_GLIB_WRAP(Circle)
+
+namespace Ganv {
+
+class Canvas;
+
+/** An elliptical Item which is Node.
+ *
+ * Unlike a Module, this doesn't contain ports, but is directly joinable itself
+ * (think your classic circles 'n' lines diagram, ala FSM).
+ *
+ * @ingroup Ganv
+ */
+class Circle : public Node
+{
+public:
+	static const uint32_t FILL_COLOUR   = 0x1E2224FF;
+	static const uint32_t BORDER_COLOUR = 0xD3D7CFFF;
+
+	Circle(Canvas&            canvas,
+	       const std::string& name,
+	       double             x,
+	       double             y)
+		: Node(&canvas,
+		       GANV_NODE(
+			       ganv_item_new(
+				       GANV_ITEM(canvas.root()),
+				       ganv_circle_get_type(),
+				       "x", x,
+				       "y", y,
+				       "can-tail", TRUE,
+				       "can-head", TRUE,
+				       "fill-color", FILL_COLOUR,
+				       "border-color", BORDER_COLOUR,
+				       "label", name.c_str(),
+				       "draggable", TRUE,
+				       NULL)))
+	{}
+
+	RW_PROPERTY(double, radius)
+	RW_PROPERTY(double, radius_ems)
+	RW_PROPERTY(gboolean, fit_label)
+
+	GanvCircle*       gobj()       { return GANV_CIRCLE(_gobj); }
+	const GanvCircle* gobj() const { return GANV_CIRCLE(_gobj); }
+};
+
+} // namespace Ganv
+
+#endif // GANV_CIRCLE_HPP
diff --git a/ganv/Edge.hpp b/ganv/Edge.hpp
new file mode 100644
index 0000000..a01de44
--- /dev/null
+++ b/ganv/Edge.hpp
@@ -0,0 +1,90 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_EDGE_HPP
+#define GANV_EDGE_HPP
+
+#include <stdint.h>
+
+#include <gdk/gdkevents.h>
+
+#include "ganv/Canvas.hpp"
+#include "ganv/Item.hpp"
+#include "ganv/Node.hpp"
+#include "ganv/edge.h"
+
+GANV_GLIB_WRAP(Edge)
+
+namespace Ganv {
+
+class Canvas;
+
+/** A edge (line) between two Node objects.
+ *
+ * @ingroup Ganv
+ */
+class Edge : public Item
+{
+public:
+	Edge(Canvas&  canvas,
+	     Node*    tail,
+	     Node*    head,
+	     uint32_t color = 0,
+	     bool     show_arrowhead = false,
+	     bool     curved = true)
+		: Item(GANV_ITEM(ganv_edge_new(canvas.gobj(),
+		                               tail->gobj(),
+		                               head->gobj(),
+		                               "color", color,
+		                               "curved", (gboolean)curved,
+		                               "arrowhead", (gboolean)show_arrowhead,
+		                               NULL)))
+	{}
+
+	Edge(GanvEdge* gobj)
+		: Item(GANV_ITEM(gobj))
+	{}
+
+	virtual ~Edge() {
+		if (_gobj && ganv_item_get_parent(_gobj)) {
+			g_object_unref(_gobj);
+		}
+	}
+
+	gboolean is_within(double x1, double y1, double x2, double y2) const {
+		return ganv_edge_is_within(gobj(), x1, y1, x2, y2);
+	}
+
+	RW_PROPERTY(gboolean, constraining)
+	RW_PROPERTY(gboolean, curved)
+	RW_PROPERTY(gboolean, selected)
+	RW_PROPERTY(gboolean, highlighted)
+	RW_PROPERTY(guint,    color)
+	RW_PROPERTY(gdouble,  handle_radius)
+
+	METHODRETWRAP0(ganv_edge, Node*, get_tail);
+	METHODRETWRAP0(ganv_edge, Node*, get_head);
+
+	GanvEdge*       gobj()       { return (GanvEdge*)_gobj; }
+	const GanvEdge* gobj() const { return (GanvEdge*)_gobj; }
+
+private:
+	Edge(const Edge& copy);
+	Edge& operator=(const Edge& other);
+};
+
+} // namespace Ganv
+
+#endif // GANV_EDGE_HPP
diff --git a/ganv/Item.hpp b/ganv/Item.hpp
new file mode 100644
index 0000000..680b991
--- /dev/null
+++ b/ganv/Item.hpp
@@ -0,0 +1,90 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_ITEM_HPP
+#define GANV_ITEM_HPP
+
+#include <assert.h>
+
+#include <glib.h>
+
+#include <sigc++/signal.h>
+#include <sigc++/trackable.h>
+
+#include "ganv/Canvas.hpp"
+#include "ganv/item.h"
+#include "ganv/wrap.hpp"
+
+GANV_GLIB_WRAP(Item)
+
+namespace Ganv {
+
+class Canvas;
+
+/** An item on the canvas.
+ */
+class Item : public sigc::trackable {
+public:
+	Item(GanvItem* gobj)
+		: _gobj(gobj)
+	{
+		ganv_item_set_wrapper(gobj, this);
+		if (gobj && ganv_item_get_parent(gobj)) {
+			g_signal_connect(
+				G_OBJECT(_gobj), "event", G_CALLBACK(on_item_event), this);
+		}
+	}
+
+	virtual ~Item() {
+		gtk_object_destroy(GTK_OBJECT(_gobj));
+	}
+
+	RW_PROPERTY(double, x)
+	RW_PROPERTY(double, y)
+
+	METHOD0(ganv_item, raise);
+	METHOD0(ganv_item, lower);
+	METHOD2(ganv_item, move, double, dx, double, dy);
+	METHOD0(ganv_item, show);
+	METHOD0(ganv_item, hide);
+	METHOD2(ganv_item, i2w, double*, x, double*, y);
+	METHOD2(ganv_item, w2i, double*, x, double*, y);
+	METHOD0(ganv_item, grab_focus);
+
+	Canvas* canvas() const {
+		return Glib::wrap(ganv_item_get_canvas(_gobj));
+	}
+
+	GanvItem* gobj() const { return _gobj; }
+
+	SIGNAL1(event, GdkEvent*)
+	SIGNAL1(click, GdkEventButton*)
+
+protected:
+	GanvItem* const _gobj;
+
+private:
+	static gboolean
+	on_item_event(GanvItem* canvasitem,
+	              GdkEvent* ev,
+	              void*     item)
+	{
+		return ((Item*)item)->signal_event().emit(ev);
+	}
+};
+
+} // namespace Ganv
+
+#endif // GANV_ITEM_HPP
diff --git a/ganv/Module.hpp b/ganv/Module.hpp
new file mode 100644
index 0000000..8ca4393
--- /dev/null
+++ b/ganv/Module.hpp
@@ -0,0 +1,130 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_MODULE_HPP
+#define GANV_MODULE_HPP
+
+#include <string>
+#include <vector>
+
+#include <gtkmm/container.h>
+
+#include "ganv/Canvas.hpp"
+#include "ganv/Node.hpp"
+#include "ganv/Port.hpp"
+#include "ganv/module.h"
+
+GANV_GLIB_WRAP(Module)
+
+namespace Ganv {
+
+class Canvas;
+
+/** A rectangular Item which can hold a Port.
+ *
+ * @ingroup Ganv
+ */
+class Module : public Box
+{
+public:
+	Module(Canvas&            canvas,
+	       const std::string& name,
+	       double             x                = 0,
+	       double             y                = 0,
+	       bool               show_title       = true)
+		: Box(&canvas,
+		      GANV_BOX(ganv_item_new(GANV_ITEM(canvas.root()),
+		                             ganv_module_get_type(),
+		                             "x", x,
+		                             "y", y,
+		                             "can-tail", FALSE,
+		                             "can-head", FALSE,
+		                             "radius-tl", 4.0,
+		                             "radius-tr", 4.0,
+		                             "radius-br", 4.0,
+		                             "radius-bl", 4.0,
+		                             "border-width", 2.0,
+		                             "label", name.c_str(),
+		                             "draggable", TRUE,
+		                             NULL)))
+	{}
+
+	template<typename P, typename C>
+	class iterator_base {
+	public:
+		iterator_base(GanvModule* m, guint i) : _module(m), _index(i) {}
+		template<typename T, typename U>
+		iterator_base(const iterator_base<T, U>& i)
+			: _module(i._module)
+			, _index(i._index)
+		{}
+		P* operator*() const {
+			return Glib::wrap(ganv_module_get_port(_module, _index));
+		}
+		P* operator->() const {
+			return Glib::wrap(ganv_module_get_port(_module, _index));
+		}
+		iterator_base operator++(int) const {
+			return iterator_base<P, C>(_index + 1);
+		}
+		iterator_base& operator++() {
+			++_index; return *this;
+		}
+		bool operator==(const iterator_base<P, C>& i) const {
+			return _index == i._index;
+		}
+		bool operator!=(const iterator_base<P, C>& i) const {
+			return _index != i._index;
+		}
+	private:
+		template<typename T, typename U> friend class iterator_base;
+		GanvModule* _module;
+		guint       _index;
+	};
+
+	typedef iterator_base<Port, GanvPort>             iterator;
+	typedef iterator_base<const Port, const GanvPort> const_iterator;
+
+	iterator       begin()       { return iterator(gobj(), 0); }
+	iterator       end()         { return iterator(gobj(), num_ports()); }
+	iterator       back()        { return iterator(gobj(), num_ports() - 1); }
+	const_iterator begin() const { return iterator(const_cast<GanvModule*>(gobj()), 0); }
+	const_iterator end()   const { return iterator(const_cast<GanvModule*>(gobj()), num_ports()); }
+	const_iterator back()  const { return iterator(const_cast<GanvModule*>(gobj()), num_ports() - 1); }
+
+	void embed(Gtk::Widget* widget) {
+		ganv_module_embed(gobj(), widget ? widget->gobj() : NULL);
+	}
+
+	Port* get_port(guint index) {
+		return Glib::wrap(ganv_module_get_port(gobj(), index));
+	}
+
+	METHOD2(ganv_module, for_each_port, GanvPortFunc, f, void*, data);
+
+	METHODRET0(ganv_module, guint, num_ports);
+
+	RW_PROPERTY(gboolean, stacked)
+
+	METHODRET0(ganv_module, double, get_empty_port_breadth)
+	METHODRET0(ganv_module, double, get_empty_port_depth)
+
+	GanvModule*       gobj()       { return GANV_MODULE(_gobj); }
+	const GanvModule* gobj() const { return GANV_MODULE(_gobj); }
+};
+
+} // namespace Ganv
+
+#endif // GANV_MODULE_HPP
diff --git a/ganv/Node.hpp b/ganv/Node.hpp
new file mode 100644
index 0000000..2fef74c
--- /dev/null
+++ b/ganv/Node.hpp
@@ -0,0 +1,106 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_NODE_HPP
+#define GANV_NODE_HPP
+
+#include <glib.h>
+#include <assert.h>
+
+#include "ganv/node.h"
+#include "ganv/Item.hpp"
+
+GANV_GLIB_WRAP(Node)
+
+namespace Ganv {
+
+class Canvas;
+class Node;
+
+/** An object a Edge can connect to.
+ */
+class Node : public Item {
+public:
+	Node(Canvas* canvas, GanvNode* gobj)
+		: Item(GANV_ITEM(g_object_ref(gobj)))
+	{
+		g_signal_connect(gobj, "moved", G_CALLBACK(on_moved), this);
+		CONNECT_PROP_SIGNAL(gobj, selected, on_notify_bool, &Node::on_selected)
+	}
+
+	~Node() {
+		g_object_unref(_gobj);
+	}
+
+	RW_PROPERTY(gboolean, can_tail)
+	RW_PROPERTY(gboolean, can_head)
+	RW_PROPERTY(gboolean, is_source)
+
+	gboolean is_within(double x1, double y1, double x2, double y2) const {
+		return ganv_node_is_within(gobj(), x1, y1, x2, y2);
+	}
+
+	RW_PROPERTY(const char*, label)
+	RW_PROPERTY(double, border_width)
+	RW_PROPERTY(double, dash_length)
+	RW_PROPERTY(double, dash_offset)
+	RW_PROPERTY(guint, fill_color)
+	RW_PROPERTY(guint, border_color)
+	RW_PROPERTY(gboolean, selected)
+	RW_PROPERTY(gboolean, highlighted)
+	RW_PROPERTY(gboolean, draggable)
+	RW_PROPERTY(gboolean, grabbed)
+
+	RW_OBJECT_PROPERTY(Node*, partner);
+
+	GanvNode*       gobj()       { return GANV_NODE(_gobj); }
+	const GanvNode* gobj() const { return GANV_NODE(_gobj); }
+
+	METHOD2(ganv_node, move, double, dx, double, dy)
+	METHOD2(ganv_node, move_to, double, x, double, y)
+
+	METHOD0(ganv_node, disconnect);
+
+	sigc::signal<void, double, double>& signal_moved() {
+		return _signal_moved;
+	}
+
+private:
+	sigc::signal<void, double, double> _signal_moved;
+
+	static void on_moved(GanvNode* node, double x, double y) {
+		Glib::wrap(node)->_signal_moved.emit(x, y);
+	}
+
+	/* GCC 4.6 can't handle this
+	template<typename T>
+	static void on_notify(GObject* gobj, GParamSpec* pspec, gpointer signal) {
+		T value;
+		g_object_get(gobj, g_param_spec_get_name(pspec), &value, NULL);
+		((sigc::signal<bool, T>*)signal)->emit(value);
+	}
+	*/
+	static void on_notify_bool(GObject*    gobj,
+	                           GParamSpec* pspec,
+	                           gpointer    signal) {
+		gboolean value;
+		g_object_get(gobj, g_param_spec_get_name(pspec), &value, NULL);
+		((sigc::signal<bool, gboolean>*)signal)->emit(value);
+	}
+};
+
+} // namespace Ganv
+
+#endif // GANV_NODE_HPP
diff --git a/ganv/Port.hpp b/ganv/Port.hpp
new file mode 100644
index 0000000..94fb760
--- /dev/null
+++ b/ganv/Port.hpp
@@ -0,0 +1,76 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2014 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_PORT_HPP
+#define GANV_PORT_HPP
+
+#include <stdint.h>
+
+#include <string>
+
+#include <gdkmm/types.h>
+
+#include "ganv/Box.hpp"
+#include "ganv/port.h"
+
+GANV_GLIB_WRAP(Port)
+
+namespace Ganv {
+
+class Module;
+
+/** A port on a Module.
+ *
+ * This is a group that contains both the label and rectangle for a port.
+ *
+ * @ingroup Ganv
+ */
+class Port : public Box
+{
+public:
+	Port(Module&            module,
+	     const std::string& name,
+	     bool               is_input,
+	     uint32_t           color);
+
+	RW_PROPERTY(gboolean, is_controllable)
+
+	METHODRET0(ganv_port, gboolean, is_input)
+	METHODRET0(ganv_port, gboolean, is_output)
+
+	METHODRET0(ganv_port, double, get_natural_width);
+	METHODRET0(ganv_port, float, get_control_value)
+	METHODRET0(ganv_port, float, get_control_min)
+	METHODRET0(ganv_port, float, get_control_max)
+	METHOD0(ganv_port, show_control)
+	METHOD0(ganv_port, hide_control)
+	METHOD1(ganv_port, set_control_is_toggle, gboolean, is_toggle)
+	METHOD1(ganv_port, set_control_is_integer, gboolean, is_integer)
+	METHOD1(ganv_port, set_control_value, float, value)
+	METHOD1(ganv_port, set_control_min, float, min)
+	METHOD1(ganv_port, set_control_max, float, max)
+	METHOD1(ganv_port, set_value_label, const char*, str);
+
+	sigc::signal<void, double> signal_value_changed;
+
+	Module* get_module() const;
+
+	GanvPort*       gobj()       { return GANV_PORT(_gobj); }
+	const GanvPort* gobj() const { return GANV_PORT(_gobj); }
+};
+
+} // namespace Ganv
+
+#endif // GANV_PORT_HPP
diff --git a/ganv/box.h b/ganv/box.h
new file mode 100644
index 0000000..ab166bf
--- /dev/null
+++ b/ganv/box.h
@@ -0,0 +1,78 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2014 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_BOX_H
+#define GANV_BOX_H
+
+#include "ganv/node.h"
+
+G_BEGIN_DECLS
+
+#define GANV_TYPE_BOX            (ganv_box_get_type())
+#define GANV_BOX(obj)            (GTK_CHECK_CAST((obj), GANV_TYPE_BOX, GanvBox))
+#define GANV_BOX_CLASS(klass)    (GTK_CHECK_CLASS_CAST((klass), GANV_TYPE_BOX, GanvBoxClass))
+#define GANV_IS_BOX(obj)         (GTK_CHECK_TYPE((obj), GANV_TYPE_BOX))
+#define GANV_IS_BOX_CLASS(klass) (GTK_CHECK_CLASS_TYPE((klass), GANV_TYPE_BOX))
+#define GANV_BOX_GET_CLASS(obj)  (GTK_CHECK_GET_CLASS((obj), GANV_TYPE_BOX, GanvBoxClass))
+
+typedef struct _GanvBoxClass   GanvBoxClass;
+typedef struct _GanvBoxPrivate GanvBoxPrivate;
+
+struct _GanvBox {
+	GanvNode        node;
+	GanvBoxPrivate* impl;
+};
+
+/**
+ * GanvBoxClass:
+ * @parent_class: Node superclass.
+ * @set_width: Set the width of the box.
+ * @set_height: Set the height of the box.
+ */
+struct _GanvBoxClass {
+	GanvNodeClass parent_class;
+
+	void (*set_width)(GanvBox* box,
+	                  double   width);
+
+	void (*set_height)(GanvBox* box,
+	                   double   height);
+
+	/* Reserved for future expansion */
+	gpointer spare_vmethods[4];
+};
+
+GType  ganv_box_get_type(void) G_GNUC_CONST;
+double ganv_box_get_x1(const GanvBox* box);
+double ganv_box_get_y1(const GanvBox* box);
+double ganv_box_get_x2(const GanvBox* box);
+double ganv_box_get_y2(const GanvBox* box);
+double ganv_box_get_width(const GanvBox* box);
+void   ganv_box_set_width(GanvBox* box, double width);
+double ganv_box_get_height(const GanvBox* box);
+void   ganv_box_set_height(GanvBox* box, double height);
+double ganv_box_get_border_width(const GanvBox* box);
+
+/**
+ * ganv_box_normalize:
+ * @box: The box to normalize.
+ *
+ * Normalize the box coordinates such that x1 < x2 and y1 < y2.
+ */
+void ganv_box_normalize(GanvBox* box);
+
+G_END_DECLS
+
+#endif  /* GANV_BOX_H */
diff --git a/ganv/canvas.h b/ganv/canvas.h
new file mode 100644
index 0000000..3ffb55c
--- /dev/null
+++ b/ganv/canvas.h
@@ -0,0 +1,630 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_CANVAS_H
+#define GANV_CANVAS_H
+
+#include <stdarg.h>
+
+#include <cairo.h>
+#include <gtk/gtk.h>
+
+#include "ganv/canvas.h"
+#include "ganv/types.h"
+#include "ganv/edge.h"
+#include "ganv/item.h"
+
+G_BEGIN_DECLS
+
+#define GANV_TYPE_CANVAS            (ganv_canvas_get_type())
+#define GANV_CANVAS(obj)            (GTK_CHECK_CAST((obj), GANV_TYPE_CANVAS, GanvCanvas))
+#define GANV_CANVAS_CLASS(klass)    (GTK_CHECK_CLASS_CAST((klass), GANV_TYPE_CANVAS, GanvCanvasClass))
+#define GANV_IS_CANVAS(obj)         (GTK_CHECK_TYPE((obj), GANV_TYPE_CANVAS))
+#define GANV_IS_CANVAS_CLASS(klass) (GTK_CHECK_CLASS_TYPE((klass), GANV_TYPE_CANVAS))
+#define GANV_CANVAS_GET_CLASS(obj)  (GTK_CHECK_GET_CLASS((obj), GANV_TYPE_CANVAS, GanvCanvasClass))
+
+typedef struct GanvCanvasImpl   GanvCanvasPrivate;
+typedef struct _GanvCanvasClass GanvCanvasClass;
+
+/**
+ * GanvDirection:
+ * @GANV_DIRECTION_DOWN: Signal flows from top to bottom.
+ * @GANV_DIRECTION_RIGHT: Signal flows from left to right.
+ *
+ * Specifies the direction of signal flow on the canvas, which affects the
+ * appearance of modules and how the canvas is auto-arranged.
+ */
+typedef enum {
+	GANV_DIRECTION_DOWN,
+	GANV_DIRECTION_RIGHT
+} GanvDirection;
+
+struct _GanvCanvas {
+	GtkLayout          layout;
+	GanvCanvasPrivate* impl;
+};
+
+struct _GanvCanvasClass {
+	GtkLayoutClass parent_class;
+
+	/* Reserved for future expansion */
+	gpointer spare_vmethods[4];
+};
+
+GType ganv_canvas_get_type(void) G_GNUC_CONST;
+
+/**
+ * GanvEdgeFunc:
+ * @edge: Canvas edge.
+ * @data: User callback data.
+ *
+ * A node function that takes a user data argument (for callbacks).
+ *
+ * Note that in the Gtk world it is considered safe to cast a function to a
+ * function with more arguments and call the resulting pointer, so functions
+ * like ganv_edge_select can safely be used where a GanvEdgeFunc is expected.
+ */
+typedef void (*GanvEdgeFunc)(GanvEdge* edge, void* data);
+
+/**
+ * GanvNodeFunc:
+ * @node: Canvas node.
+ * @data: User callback data.
+ *
+ * A node function that takes a user data argument (for callbacks).
+ *
+ * Note that in the Gtk world it is considered safe to cast a function to a
+ * function with more arguments and call the resulting pointer, so functions
+ * like ganv_node_select can safely be used where a GanvNodeFunc is expected.
+ */
+typedef void (*GanvNodeFunc)(GanvNode* node, void* data);
+
+typedef int (*GanvPortOrderFunc)(const GanvPort*, const GanvPort*, void* data);
+
+/**
+ * ganv_canvas_new:
+ *
+ * Return value: A newly-created canvas.
+ */
+GanvCanvas*
+ganv_canvas_new(double width, double height);
+
+/**
+ * ganv_canvas_set_wrapper:
+ *
+ * Set the opaque wrapper object for the canvas.
+ */
+void
+ganv_canvas_set_wrapper(GanvCanvas* canvas, void* wrapper);
+
+/**
+ * ganv_canvas_get_wrapper:
+ *
+ * Return an opaque pointer to the wrapper for the canvas.
+ */
+void*
+ganv_canvas_get_wrapper(GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_clear:
+ *
+ * Remove all items from the canvas.
+ */
+void
+ganv_canvas_clear(GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_empty:
+ *
+ * Return value: True if there are no items on the canvas.
+ */
+gboolean
+ganv_canvas_empty(const GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_resize:
+ *
+ * Resize the canvas to the given dimensions.
+ */
+void
+ganv_canvas_resize(GanvCanvas* canvas, double width, double height);
+
+/**
+ * ganv_canvas_root:
+ * @canvas: A canvas.
+ *
+ * Return value: (transfer none): The root group of the canvas.
+ */
+GanvItem*
+ganv_canvas_root(GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_set_scroll_region:
+ * @canvas: A canvas.
+ * @x1: Leftmost limit of the scrolling region.
+ * @y1: Upper limit of the scrolling region.
+ * @x2: Rightmost limit of the scrolling region.
+ * @y2: Lower limit of the scrolling region.
+ *
+ * Sets the scrolling region of a canvas to the specified rectangle.  The
+ * canvas will then be able to scroll only within this region.  The view of the
+ * canvas is adjusted as appropriate to display as much of the new region as
+ * possible.
+ */
+void
+ganv_canvas_set_scroll_region(GanvCanvas* canvas,
+                              double x1, double y1, double x2, double y2);
+
+/**
+ * ganv_canvas_get_scroll_region:
+ * @canvas: A canvas.
+ * @x1: Leftmost limit of the scrolling region (return value).
+ * @y1: Upper limit of the scrolling region (return value).
+ * @x2: Rightmost limit of the scrolling region (return value).
+ * @y2: Lower limit of the scrolling region (return value).
+ *
+ * Queries the scrolling region of a canvas.
+ */
+void
+ganv_canvas_get_scroll_region(GanvCanvas* canvas,
+                              double* x1, double* y1, double* x2, double* y2);
+
+/**
+ * ganv_canvas_set_center_scroll_region:
+ * @canvas: A canvas.
+ * @center_scroll_region: Whether to center the scrolling region in the canvas
+ * window when it is smaller than the canvas' allocation.
+ *
+ * When the scrolling region of the canvas is smaller than the canvas window,
+ * e.g.  the allocation of the canvas, it can be either centered on the window
+ * or simply made to be on the upper-left corner on the window.  This function
+ * lets you configure this property.
+ */
+void
+ganv_canvas_set_center_scroll_region(GanvCanvas* canvas,
+                                     gboolean    center_scroll_region);
+
+/**
+ * ganv_canvas_get_center_scroll_region:
+ * @canvas: A canvas.
+ *
+ * Returns whether the canvas is set to center the scrolling region in the
+ * window if the former is smaller than the canvas' allocation.
+ *
+ * Returns: Whether the scroll region is being centered in the canvas window.
+ */
+gboolean
+ganv_canvas_get_center_scroll_region(const GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_scroll_to:
+ * @canvas: A canvas.
+ * @cx: Horizontal scrolling offset in canvas pixel units.
+ * @cy: Vertical scrolling offset in canvas pixel units.
+ *
+ * Makes a canvas scroll to the specified offsets, given in canvas pixel units.
+ * The canvas will adjust the view so that it is not outside the scrolling
+ * region.  This function is typically not used, as it is better to hook
+ * scrollbars to the canvas layout's scrolling adjusments.
+ */
+void
+ganv_canvas_scroll_to(GanvCanvas* canvas, int cx, int cy);
+
+/**
+ * ganv_canvas_get_scroll_offsets:
+ * @canvas: A canvas.
+ * @cx: Horizontal scrolling offset (return value).
+ * @cy: Vertical scrolling offset (return value).
+ *
+ * Queries the scrolling offsets of a canvas.  The values are returned in canvas
+ * pixel units.
+ */
+void
+ganv_canvas_get_scroll_offsets(const GanvCanvas* canvas, int* cx, int* cy);
+
+/**
+ * ganv_canvas_w2c_affine:
+ * @canvas: A canvas.
+ * @matrix: An affine transformation matrix (return value).
+ *
+ * Gets the affine transform that converts from world coordinates to canvas
+ * pixel coordinates.
+ */
+void
+ganv_canvas_w2c_affine(GanvCanvas* canvas, cairo_matrix_t* matrix);
+
+/**
+ * ganv_canvas_w2c:
+ * @canvas: A canvas.
+ * @wx: World X coordinate.
+ * @wy: World Y coordinate.
+ * @cx: X pixel coordinate (return value).
+ * @cy: Y pixel coordinate (return value).
+ *
+ * Converts world coordinates into canvas pixel coordinates.
+ */
+void
+ganv_canvas_w2c(GanvCanvas* canvas, double wx, double wy, int* cx, int* cy);
+
+/**
+ * ganv_canvas_w2c_d:
+ * @canvas: A canvas.
+ * @wx: World X coordinate.
+ * @wy: World Y coordinate.
+ * @cx: X pixel coordinate (return value).
+ * @cy: Y pixel coordinate (return value).
+ *
+ * Converts world coordinates into canvas pixel coordinates.  This version
+ * uses floating point coordinates for greater precision.
+ */
+void
+ganv_canvas_w2c_d(GanvCanvas* canvas,
+                  double      wx,
+                  double      wy,
+                  double*     cx,
+                  double*     cy);
+
+/**
+ * ganv_canvas_c2w:
+ * @canvas: A canvas.
+ * @cx: Canvas pixel X coordinate.
+ * @cy: Canvas pixel Y coordinate.
+ * @wx: X world coordinate (return value).
+ * @wy: Y world coordinate (return value).
+ *
+ * Converts canvas pixel coordinates to world coordinates.
+ */
+void
+ganv_canvas_c2w(GanvCanvas* canvas, int cx, int cy, double* wx, double* wy);
+
+/**
+ * ganv_canvas_window_to_world:
+ * @canvas: A canvas.
+ * @winx: Window-relative X coordinate.
+ * @winy: Window-relative Y coordinate.
+ * @worldx: X world coordinate (return value).
+ * @worldy: Y world coordinate (return value).
+ *
+ * Converts window-relative coordinates into world coordinates.  You can use
+ * this when you need to convert mouse coordinates into world coordinates, for
+ * example.
+ */
+void
+ganv_canvas_window_to_world(GanvCanvas* canvas,
+                            double      winx,
+                            double      winy,
+                            double*     worldx,
+                            double*     worldy);
+
+/**
+ * ganv_canvas_world_to_window:
+ * @canvas: A canvas.
+ * @worldx: World X coordinate.
+ * @worldy: World Y coordinate.
+ * @winx: X window-relative coordinate.
+ * @winy: Y window-relative coordinate.
+ *
+ * Converts world coordinates into window-relative coordinates.
+ */
+void
+ganv_canvas_world_to_window(GanvCanvas* canvas,
+                            double      worldx,
+                            double      worldy,
+                            double*     winx,
+                            double*     winy);
+
+/**
+ * ganv_canvas_get_item_at:
+ * @canvas: A canvas.
+ * @x: X position in world coordinates.
+ * @y: Y position in world coordinates.
+ *
+ * Looks for the item that is under the specified position, which must be
+ * specified in world coordinates.
+ *
+ * Returns: (transfer none): The sought item, or NULL if no item is at the
+ * specified coordinates.
+ */
+GanvItem*
+ganv_canvas_get_item_at(GanvCanvas* canvas, double x, double y);
+
+/**
+ * ganv_canvas_get_edge:
+ *
+ * Get the edge between two nodes, or NULL if none exists.
+ *
+ * Return value: (transfer none): The root group of @canvas.
+ */
+GanvEdge*
+ganv_canvas_get_edge(GanvCanvas* canvas,
+                     GanvNode*   tail,
+                     GanvNode*   head);
+
+/**
+ * ganv_canvas_remove_edge:
+ *
+ * Remove @edge from the canvas.
+ */
+void
+ganv_canvas_remove_edge(GanvCanvas* canvas,
+                        GanvEdge*   edge);
+
+/**
+ * ganv_canvas_remove_edge_between:
+ *
+ * Remove the edge from @tail to @head if one exists.
+ */
+void
+ganv_canvas_remove_edge_between(GanvCanvas* canvas,
+                                GanvNode*   tail,
+                                GanvNode*   head);
+
+/**
+ * ganv_canvas_get_direction:
+ *
+ * Return the direction of signal flow.
+ */
+GanvDirection
+ganv_canvas_get_direction(GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_set_direction:
+ *
+ * Set the direction of signal flow.
+ */
+void
+ganv_canvas_set_direction(GanvCanvas* canvas, GanvDirection dir);
+
+/**
+ * ganv_canvas_arrange:
+ *
+ * Automatically arrange the canvas contents.
+ */
+void
+ganv_canvas_arrange(GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_export_image:
+ *
+ * Draw the canvas to an image file.  The file type is determined by extension,
+ * currently supported: pdf, ps, svg, dot.
+ *
+ * Returns: 0 on success.
+ */
+int
+ganv_canvas_export_image(GanvCanvas* canvas,
+                         const char* filename,
+                         gboolean    draw_background);
+
+/**
+ * ganv_canvas_export_dot:
+ *
+ * Write a Graphviz DOT description of the canvas to a file.
+ */
+void
+ganv_canvas_export_dot(GanvCanvas* canvas, const char* filename);
+
+/**
+ * ganv_canvas_supports_sprung_layout:
+ *
+ * Returns: true iff ganv is compiled with sprung layout support.
+ */
+gboolean
+ganv_canvas_supports_sprung_layout(const GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_set_sprung_layout:
+ *
+ * Enable or disable "live" force-directed canvas layout.
+ *
+ * Returns: true iff sprung layout was enabled.
+ */
+gboolean
+ganv_canvas_set_sprung_layout(GanvCanvas* canvas, gboolean sprung_layout);
+
+/**
+ * ganv_canvas_get_locked:
+ *
+ * Return true iff the canvas is locked and nodes may not move.
+ */
+gboolean
+ganv_canvas_get_locked(const GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_for_each_node:
+ * @canvas: The canvas.
+ * @f: (scope call): A function to call on every node on @canvas.
+ * @data: Data to pass to @f.
+ */
+void
+ganv_canvas_for_each_node(GanvCanvas*  canvas,
+                          GanvNodeFunc f,
+                          void*        data);
+
+/**
+ * ganv_canvas_for_each_selected_node:
+ * @canvas: The canvas.
+ * @f: (scope call): A function to call on every selected node on @canvas.
+ * @data: Data to pass to @f.
+ */
+void
+ganv_canvas_for_each_selected_node(GanvCanvas*  canvas,
+                                   GanvNodeFunc f,
+                                   void*        data);
+
+/**
+ * ganv_canvas_for_each_edge:
+ * @canvas: The canvas.
+ * @f: (scope call): A function to call on every edge on @canvas.
+ * @data: Data to pass to @f.
+ */
+void
+ganv_canvas_for_each_edge(GanvCanvas*  canvas,
+                          GanvEdgeFunc f,
+                          void*        data);
+
+/**
+ * ganv_canvas_for_each_edge_from:
+ * @canvas: The canvas.
+ * @tail: The tail to enumerate every edge for.
+ * @f: (scope call): A function to call on every edge leaving @tail.
+ */
+void
+ganv_canvas_for_each_edge_from(GanvCanvas*     canvas,
+                               const GanvNode* tail,
+                               GanvEdgeFunc    f,
+                               void*           data);
+
+/**
+ * ganv_canvas_for_each_edge_to:
+ * @canvas: The canvas.
+ * @head: The head to enumerate every edge for.
+ * @f: (scope call): A function to call on every edge entering @head.
+ */
+void
+ganv_canvas_for_each_edge_to(GanvCanvas*     canvas,
+                             const GanvNode* head,
+                             GanvEdgeFunc    f,
+                             void*           data);
+
+/**
+ * ganv_canvas_for_each_edge_on:
+ * @canvas: The canvas.
+ * @node: The node to enumerate every edge for.
+ * @f: (scope call): A function to call on every edge attached to @node.
+ */
+void
+ganv_canvas_for_each_edge_on(GanvCanvas*     canvas,
+                             const GanvNode* node,
+                             GanvEdgeFunc    f,
+                             void*           data);
+
+/**
+ * ganv_canvas_for_each_selected_edge:
+ * @canvas: The canvas.
+ * @f: (scope call): A function to call on every edge attached to @node.
+ * @data: Data to pass to @f.
+ */
+void
+ganv_canvas_for_each_selected_edge(GanvCanvas*  canvas,
+                                   GanvEdgeFunc f,
+                                   void*        data);
+
+/**
+ * ganv_canvas_select_all:
+ *
+ * Select all items on the canvas.
+ */
+void
+ganv_canvas_select_all(GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_clear_selection:
+ *
+ * Deselect any selected items on the canvas.
+ */
+void
+ganv_canvas_clear_selection(GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_get_zoom:
+ *
+ * Return the current zoom factor (pixels per unit).
+ */
+double
+ganv_canvas_get_zoom(const GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_set_zoom:
+ * @canvas: A canvas.
+ * @zoom: The number of pixels that correspond to one canvas unit.
+ *
+ * The anchor point for zooming, i.e. the point that stays fixed and all others
+ * zoom inwards or outwards from it, depends on whether the canvas is set to
+ * center the scrolling region or not.  You can control this using the
+ * ganv_canvas_set_center_scroll_region() function.  If the canvas is set to
+ * center the scroll region, then the center of the canvas window is used as
+ * the anchor point for zooming.  Otherwise, the upper-left corner of the
+ * canvas window is used as the anchor point.
+ */
+void
+ganv_canvas_set_zoom(GanvCanvas* canvas, double zoom);
+
+/**
+ * ganv_canvas_zoom_full:
+ *
+ * Zoom so all canvas contents are visible.
+ */
+void
+ganv_canvas_zoom_full(GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_get_default_font_size:
+ *
+ * Get the default font size in points.
+ */
+double
+ganv_canvas_get_default_font_size(const GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_get_font_size:
+ *
+ * Get the current font size in points.
+ */
+double
+ganv_canvas_get_font_size(const GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_set_font_size:
+ *
+ * Set the current font size in points.
+ */
+void
+ganv_canvas_set_font_size(GanvCanvas* canvas, double points);
+
+/**
+ * ganv_canvas_get_move_cursor:
+ *
+ * Return the cursor to use while dragging canvas objects.
+ */
+GdkCursor*
+ganv_canvas_get_move_cursor(const GanvCanvas* canvas);
+
+/**
+ * ganv_canvas_move_contents_to:
+ *
+ * Shift all canvas contents so the top-left object is at (x, y).
+ */
+void
+ganv_canvas_move_contents_to(GanvCanvas* canvas, double x, double y);
+
+/**
+ * ganv_canvas_set_port_order:
+ * @canvas The canvas to set the default port order on.
+ * @port_cmp Port comparison function.
+ * @data Data to be passed to order.
+ *
+ * Set a comparator function to use as the default order for ports on modules.
+ * If left unset, ports are shown in the order they are added.
+ */
+void
+ganv_canvas_set_port_order(GanvCanvas*       canvas,
+                           GanvPortOrderFunc port_cmp,
+                           void*             data);
+
+
+G_END_DECLS
+
+#endif  /* GANV_CANVAS_H */
diff --git a/ganv/circle.h b/ganv/circle.h
new file mode 100644
index 0000000..f181b54
--- /dev/null
+++ b/ganv/circle.h
@@ -0,0 +1,78 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2014 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_CIRCLE_H
+#define GANV_CIRCLE_H
+
+#include "ganv/node.h"
+
+G_BEGIN_DECLS
+
+#define GANV_TYPE_CIRCLE            (ganv_circle_get_type())
+#define GANV_CIRCLE(obj)            (GTK_CHECK_CAST((obj), GANV_TYPE_CIRCLE, GanvCircle))
+#define GANV_CIRCLE_CLASS(klass)    (GTK_CHECK_CLASS_CAST((klass), GANV_TYPE_CIRCLE, GanvCircleClass))
+#define GANV_IS_CIRCLE(obj)         (GTK_CHECK_TYPE((obj), GANV_TYPE_CIRCLE))
+#define GANV_IS_CIRCLE_CLASS(klass) (GTK_CHECK_CLASS_TYPE((klass), GANV_TYPE_CIRCLE))
+#define GANV_CIRCLE_GET_CLASS(obj)  (GTK_CHECK_GET_CLASS((obj), GANV_TYPE_CIRCLE, GanvCircleClass))
+
+typedef struct _GanvCircle        GanvCircle;
+typedef struct _GanvCircleClass   GanvCircleClass;
+typedef struct _GanvCirclePrivate GanvCirclePrivate;
+
+/**
+ * GanvCircle:
+ *
+ * A circular #GanvNode.  A #GanvCircle is a leaf, that is, it does not contain
+ * any child nodes (though, like any #GanvNode, it may have a label).
+ */
+struct _GanvCircle {
+	GanvNode           node;
+	GanvCirclePrivate* impl;
+};
+
+struct _GanvCircleClass {
+	GanvNodeClass parent_class;
+
+	/* Reserved for future expansion */
+	gpointer spare_vmethods[4];
+};
+
+GType ganv_circle_get_type(void) G_GNUC_CONST;
+
+GanvCircle*
+ganv_circle_new(GanvCanvas* canvas,
+                const char* first_prop_name, ...);
+
+double
+ganv_circle_get_radius(const GanvCircle* circle);
+
+void
+ganv_circle_set_radius(GanvCircle* circle, double radius);
+
+double
+ganv_circle_get_radius_ems(const GanvCircle* circle);
+
+void
+ganv_circle_set_radius_ems(GanvCircle* circle, double radius);
+
+gboolean
+ganv_circle_get_fit_label(const GanvCircle* circle);
+
+void
+ganv_circle_set_fit_label(GanvCircle* circle, gboolean fit_label);
+
+G_END_DECLS
+
+#endif  /* GANV_CIRCLE_H */
diff --git a/ganv/edge.h b/ganv/edge.h
new file mode 100644
index 0000000..bf0fb14
--- /dev/null
+++ b/ganv/edge.h
@@ -0,0 +1,129 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_EDGE_H
+#define GANV_EDGE_H
+
+#include "ganv/item.h"
+#include "ganv/node.h"
+#include "ganv/types.h"
+
+G_BEGIN_DECLS
+
+#define GANV_TYPE_EDGE            (ganv_edge_get_type())
+#define GANV_EDGE(obj)            (GTK_CHECK_CAST((obj), GANV_TYPE_EDGE, GanvEdge))
+#define GANV_EDGE_CLASS(klass)    (GTK_CHECK_CLASS_CAST((klass), GANV_TYPE_EDGE, GanvEdgeClass))
+#define GANV_IS_EDGE(obj)         (GTK_CHECK_TYPE((obj), GANV_TYPE_EDGE))
+#define GANV_IS_EDGE_CLASS(klass) (GTK_CHECK_CLASS_TYPE((klass), GANV_TYPE_EDGE))
+#define GANV_EDGE_GET_CLASS(obj)  (GTK_CHECK_GET_CLASS((obj), GANV_TYPE_EDGE, GanvEdgeClass))
+
+typedef struct _GanvEdgeClass   GanvEdgeClass;
+typedef struct _GanvEdgePrivate GanvEdgePrivate;
+
+struct _GanvEdge {
+	GanvItem         item;
+	GanvEdgePrivate* impl;
+};
+
+struct _GanvEdgeClass {
+	GanvItemClass parent_class;
+
+	/* Reserved for future expansion */
+	gpointer spare_vmethods[4];
+};
+
+GType ganv_edge_get_type(void) G_GNUC_CONST;
+
+GanvEdge*
+ganv_edge_new(GanvCanvas* canvas,
+              GanvNode*   tail,
+              GanvNode*   head,
+              const char* first_prop_name, ...);
+
+gboolean
+ganv_edge_is_within(const GanvEdge* edge,
+                    double          x1,
+                    double          y1,
+                    double          x2,
+                    double          y2);
+
+gboolean
+ganv_edge_get_curved(const GanvEdge* edge);
+
+void
+ganv_edge_set_curved(GanvEdge* edge, gboolean curved);
+
+gboolean
+ganv_edge_get_constraining(const GanvEdge* edge);
+
+void
+ganv_edge_set_constraining(GanvEdge* edge, gboolean constraining);
+
+void
+ganv_edge_set_selected(GanvEdge* edge, gboolean selected);
+
+void
+ganv_edge_set_highlighted(GanvEdge* edge, gboolean highlighted);
+
+void
+ganv_edge_select(GanvEdge* edge);
+
+void
+ganv_edge_unselect(GanvEdge* edge);
+
+void
+ganv_edge_highlight(GanvEdge* edge);
+
+void
+ganv_edge_unhighlight(GanvEdge* edge);
+
+/**
+ * ganv_edge_disconnect:
+ *
+ * Disconnect the edge.  This will disconnect the edge just as if it had been
+ * disconnected by the user via the canvas.  The canvas disconnect signal will
+ * be emitted, allowing the application to control disconnect logic.
+ */
+void
+ganv_edge_disconnect(GanvEdge* edge);
+
+/**
+ * ganv_edge_remove:
+ *
+ * Remove the edge from the canvas.  This will only remove the edge visually,
+ * it will not emit the canvas disconnect signal to notify the application.
+ */
+void
+ganv_edge_remove(GanvEdge* edge);
+
+/**
+ * ganv_edge_get_tail:
+ *
+ * Return value: (transfer none): The tail of `edge`.
+ */
+GanvNode*
+ganv_edge_get_tail(const GanvEdge* edge);
+
+/**
+ * ganv_edge_get_head:
+ *
+ * Return value: (transfer none): The head of `edge`.
+ */
+GanvNode*
+ganv_edge_get_head(const GanvEdge* edge);
+
+G_END_DECLS
+
+#endif  /* GANV_EDGE_H */
diff --git a/ganv/ganv.h b/ganv/ganv.h
new file mode 100644
index 0000000..9a00143
--- /dev/null
+++ b/ganv/ganv.h
@@ -0,0 +1,31 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2016 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_GANV_H
+#define GANV_GANV_H
+
+#include "ganv/box.h"
+#include "ganv/canvas.h"
+#include "ganv/circle.h"
+#include "ganv/edge.h"
+#include "ganv/ganv.h"
+#include "ganv/group.h"
+#include "ganv/module.h"
+#include "ganv/node.h"
+#include "ganv/port.h"
+#include "ganv/text.h"
+#include "ganv/types.h"
+
+#endif  /* GANV_GANV_H */
diff --git a/ganv/ganv.hpp b/ganv/ganv.hpp
new file mode 100644
index 0000000..9b0334d
--- /dev/null
+++ b/ganv/ganv.hpp
@@ -0,0 +1,26 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_GANV_HPP
+#define GANV_GANV_HPP
+
+#include "ganv/Canvas.hpp"
+#include "ganv/Circle.hpp"
+#include "ganv/Edge.hpp"
+#include "ganv/Module.hpp"
+#include "ganv/Node.hpp"
+#include "ganv/Port.hpp"
+
+#endif // GANV_GANV_HPP
diff --git a/ganv/group.h b/ganv/group.h
new file mode 100644
index 0000000..0f835e4
--- /dev/null
+++ b/ganv/group.h
@@ -0,0 +1,55 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2014 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_GROUP_H
+#define GANV_GROUP_H
+
+#include "ganv/item.h"
+
+G_BEGIN_DECLS
+
+/* Based on GnomeCanvasGroup, by Federico Mena <federico@nuclecu.unam.mx>
+ * and Raph Levien <raph@gimp.org>
+ * Copyright 1997-2000 Free Software Foundation
+ */
+
+#define GANV_TYPE_GROUP            (ganv_group_get_type())
+#define GANV_GROUP(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj), GANV_TYPE_GROUP, GanvGroup))
+#define GANV_GROUP_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass), GANV_TYPE_GROUP, GanvGroupClass))
+#define GANV_IS_GROUP(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj), GANV_TYPE_GROUP))
+#define GANV_IS_GROUP_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), GANV_TYPE_GROUP))
+#define GANV_GROUP_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj), GANV_TYPE_GROUP, GanvGroupClass))
+
+typedef struct _GanvGroup        GanvGroup;
+typedef struct _GanvGroupPrivate GanvGroupPrivate;
+typedef struct _GanvGroupClass   GanvGroupClass;
+
+struct _GanvGroup {
+	GanvItem          item;
+	GanvGroupPrivate* impl;
+};
+
+struct _GanvGroupClass {
+	GanvItemClass parent_class;
+
+	/* Reserved for future expansion */
+	gpointer spare_vmethods[4];
+};
+
+GType ganv_group_get_type(void) G_GNUC_CONST;
+
+G_END_DECLS
+
+#endif  /* GANV_GROUP_H */
diff --git a/ganv/item.h b/ganv/item.h
new file mode 100644
index 0000000..4605ffb
--- /dev/null
+++ b/ganv/item.h
@@ -0,0 +1,184 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2016 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Based on GnomeCanvas, by Federico Mena <federico@nuclecu.unam.mx>
+ * and Raph Levien <raph@gimp.org>
+ * Copyright 1997-2000 Free Software Foundation
+ */
+
+#ifndef GANV_ITEM_H
+#define GANV_ITEM_H
+
+#include <stdarg.h>
+
+#include <cairo.h>
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+struct _GanvCanvas;
+
+typedef struct _GanvItem        GanvItem;
+typedef struct _GanvItemPrivate GanvItemPrivate;
+typedef struct _GanvItemClass   GanvItemClass;
+
+/* Object flags for items */
+enum {
+	GANV_ITEM_REALIZED      = 1 << 1,
+	GANV_ITEM_MAPPED        = 1 << 2,
+	GANV_ITEM_ALWAYS_REDRAW = 1 << 3,
+	GANV_ITEM_VISIBLE       = 1 << 4,
+	GANV_ITEM_NEED_UPDATE   = 1 << 5,
+	GANV_ITEM_NEED_VIS      = 1 << 6
+};
+
+#define GANV_TYPE_ITEM            (ganv_item_get_type())
+#define GANV_ITEM(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj), GANV_TYPE_ITEM, GanvItem))
+#define GANV_ITEM_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass), GANV_TYPE_ITEM, GanvItemClass))
+#define GANV_IS_ITEM(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj), GANV_TYPE_ITEM))
+#define GANV_IS_ITEM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), GANV_TYPE_ITEM))
+#define GANV_ITEM_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj), GANV_TYPE_ITEM, GanvItemClass))
+
+struct _GanvItem {
+	GtkObject        object;
+	GanvItemPrivate* impl;
+};
+
+struct _GanvItemClass {
+	GtkObjectClass parent_class;
+
+	/* Add a child to this item (optional). */
+	void (*add)(GanvItem* item, GanvItem* child);
+
+	/* Remove a child from this item (optional). */
+	void (*remove)(GanvItem* item, GanvItem* child);
+
+	/* Tell the item to update itself.
+	 *
+	 * The flags are from the update flags defined above.  The item should
+	 * update its internal state from its queued state, and recompute and
+	 * request its repaint area.  The update method also recomputes the
+	 * bounding box of the item.
+	 */
+	void (*update)(GanvItem* item, int flags);
+
+	/* Realize an item (create GCs, etc.). */
+	void (*realize)(GanvItem* item);
+
+	/* Unrealize an item. */
+	void (*unrealize)(GanvItem* item);
+
+	/* Map an item - normally only need by items with their own GdkWindows. */
+	void (*map)(GanvItem* item);
+
+	/* Unmap an item */
+	void (*unmap)(GanvItem* item);
+
+	/* Draw an item of this type.
+	 *
+	 * (cx, cy) and (width, height) describe the rectangle being drawn in
+	 * world-relative coordinates.
+	 */
+	void (*draw)(GanvItem* item,
+	             cairo_t*  cr,
+	             double    cx,
+	             double    cy,
+	             double    cw,
+	             double    ch);
+
+	/* Calculate the distance from an item to the specified point.
+	 *
+	 * It also returns a canvas item which is actual item the point is within,
+	 * which may not be equal to @item if @item has children.
+	 * (x, y) are item-relative coordinates.
+	 */
+	double (*point)(GanvItem*  item,
+	                double     x,
+	                double     y,
+	                GanvItem** actual_item);
+
+	/* Fetch the item's bounding box (need not be exactly tight).
+	 *
+	 * This should be in item-relative coordinates.
+	 */
+	void (*bounds)(GanvItem* item, double* x1, double* y1, double* x2, double* y2);
+
+	/* Signal: an event occurred for an item of this type.
+	 *
+	 * The (x, y) coordinates are in the canvas world coordinate system.
+	 */
+	gboolean (*event)(GanvItem* item, GdkEvent* event);
+
+	/* Reserved for future expansion */
+	gpointer spare_vmethods[4];
+};
+
+GType ganv_item_get_type(void) G_GNUC_CONST;
+
+GanvItem* ganv_item_new(GanvItem* parent, GType type,
+                        const gchar* first_arg_name, ...);
+
+void ganv_item_construct(GanvItem* item, GanvItem* parent,
+                         const gchar* first_arg_name, va_list args);
+
+void ganv_item_set(GanvItem* item, const gchar* first_arg_name, ...);
+
+void ganv_item_set_valist(GanvItem* item,
+                          const gchar* first_arg_name, va_list args);
+
+/**
+ * ganv_item_get_canvas:
+ * @item: The item.
+ *
+ * Return value: (transfer none): The canvas @item is on.
+ */
+struct _GanvCanvas* ganv_item_get_canvas(GanvItem* item);
+
+/**
+ * ganv_item_get_parent:
+ * @item: The item.
+ *
+ * Return value: (transfer none): The parent of @item.
+ */
+GanvItem* ganv_item_get_parent(GanvItem* item);
+
+void ganv_item_raise(GanvItem* item);
+
+void ganv_item_lower(GanvItem* item);
+
+void ganv_item_move(GanvItem* item, double dx, double dy);
+
+void ganv_item_show(GanvItem* item);
+
+void ganv_item_hide(GanvItem* item);
+
+void ganv_item_i2w(GanvItem* item, double* x, double* y);
+
+void ganv_item_w2i(GanvItem* item, double* x, double* y);
+
+void ganv_item_grab_focus(GanvItem* item);
+
+void ganv_item_get_bounds(GanvItem* item,
+                          double* x1, double* y1, double* x2, double* y2);
+
+void ganv_item_request_update(GanvItem* item);
+
+void ganv_item_set_wrapper(GanvItem* item, void* wrapper);
+
+void* ganv_item_get_wrapper(GanvItem* item);
+
+G_END_DECLS
+
+#endif  /* GANV_ITEM_H */
diff --git a/ganv/module.h b/ganv/module.h
new file mode 100644
index 0000000..37fcf96
--- /dev/null
+++ b/ganv/module.h
@@ -0,0 +1,95 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2014 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_MODULE_H
+#define GANV_MODULE_H
+
+#include <glib.h>
+#include <gtk/gtk.h>
+
+#include "ganv/box.h"
+
+G_BEGIN_DECLS
+
+#define GANV_TYPE_MODULE            (ganv_module_get_type())
+#define GANV_MODULE(obj)            (GTK_CHECK_CAST((obj), GANV_TYPE_MODULE, GanvModule))
+#define GANV_MODULE_CLASS(klass)    (GTK_CHECK_CLASS_CAST((klass), GANV_TYPE_MODULE, GanvModuleClass))
+#define GANV_IS_MODULE(obj)         (GTK_CHECK_TYPE((obj), GANV_TYPE_MODULE))
+#define GANV_IS_MODULE_CLASS(klass) (GTK_CHECK_CLASS_TYPE((klass), GANV_TYPE_MODULE))
+#define GANV_MODULE_GET_CLASS(obj)  (GTK_CHECK_GET_CLASS((obj), GANV_TYPE_MODULE, GanvModuleClass))
+
+typedef struct _GanvModuleClass   GanvModuleClass;
+typedef struct _GanvModulePrivate GanvModulePrivate;
+
+typedef void (*GanvPortFunc)(GanvPort* port, void* data);
+
+struct _GanvModule {
+	GanvBox            box;
+	GanvModulePrivate* impl;
+};
+
+struct _GanvModuleClass {
+	GanvBoxClass parent_class;
+
+	/* Reserved for future expansion */
+	gpointer spare_vmethods[4];
+};
+
+GType ganv_module_get_type(void) G_GNUC_CONST;
+
+GanvModule*
+ganv_module_new(GanvCanvas* canvas,
+                const char* first_prop_name, ...);
+
+guint
+ganv_module_num_ports(const GanvModule* module);
+
+/**
+ * ganv_module_get_port:
+ *
+ * Get a port by index.
+ *
+ * Return value: (transfer none): The port on @module at @index.
+ */
+GanvPort*
+ganv_module_get_port(GanvModule* module,
+                     guint       index);
+
+double
+ganv_module_get_empty_port_breadth(const GanvModule* module);
+
+double
+ganv_module_get_empty_port_depth(const GanvModule* module);
+
+void
+ganv_module_embed(GanvModule* module, GtkWidget* widget);
+
+void
+ganv_module_set_direction(GanvModule* module, GanvDirection direction);
+
+/**
+ * ganv_module_for_each_port:
+ * @module: The module.
+ * @f: (scope call): A function to call on every port on @module.
+ * @data: User data to pass to @f.
+ */
+void
+ganv_module_for_each_port(GanvModule*  module,
+                          GanvPortFunc f,
+                          void*        data);
+
+G_END_DECLS
+
+#endif  /* GANV_MODULE_H */
diff --git a/ganv/node.h b/ganv/node.h
new file mode 100644
index 0000000..b0dd82f
--- /dev/null
+++ b/ganv/node.h
@@ -0,0 +1,179 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2014 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_NODE_H
+#define GANV_NODE_H
+
+#include "ganv/item.h"
+#include "ganv/types.h"
+#include "ganv/text.h"
+
+G_BEGIN_DECLS
+
+#define GANV_TYPE_NODE            (ganv_node_get_type())
+#define GANV_NODE(obj)            (GTK_CHECK_CAST((obj), GANV_TYPE_NODE, GanvNode))
+#define GANV_NODE_CLASS(klass)    (GTK_CHECK_CLASS_CAST((klass), GANV_TYPE_NODE, GanvNodeClass))
+#define GANV_IS_NODE(obj)         (GTK_CHECK_TYPE((obj), GANV_TYPE_NODE))
+#define GANV_IS_NODE_CLASS(klass) (GTK_CHECK_CLASS_TYPE((klass), GANV_TYPE_NODE))
+#define GANV_NODE_GET_CLASS(obj)  (GTK_CHECK_GET_CLASS((obj), GANV_TYPE_NODE, GanvNodeClass))
+
+typedef struct _GanvNodeClass   GanvNodeClass;
+typedef struct _GanvNodePrivate GanvNodePrivate;
+
+struct _GanvNode {
+	GanvItem         item;
+	GanvNodePrivate* impl;
+};
+
+struct _GanvNodeClass {
+	GanvItemClass parent_class;
+
+	void (*tick)(GanvNode* self,
+	             double    seconds);
+
+	void (*move)(GanvNode* node,
+	             double    dx,
+	             double    dy);
+
+	void (*move_to)(GanvNode* node,
+	                double    x,
+	                double    y);
+
+	void (*resize)(GanvNode* node);
+
+	void (*redraw_text)(GanvNode* node);
+
+	void (*disconnect)(GanvNode* node);
+
+	gboolean (*is_within)(const GanvNode* self,
+	                      double          x1,
+	                      double          y1,
+	                      double          x2,
+	                      double          y2);
+
+	void (*tail_vector)(const GanvNode* self,
+	                    const GanvNode* head,
+	                    double*         x,
+	                    double*         y,
+	                    double*         dx,
+	                    double*         dy);
+
+	void (*head_vector)(const GanvNode* self,
+	                    const GanvNode* tail,
+	                    double*         x,
+	                    double*         y,
+	                    double*         dx,
+	                    double*         dy);
+
+	/* Reserved for future expansion */
+	gpointer spare_vmethods[4];
+};
+
+GType ganv_node_get_type(void) G_GNUC_CONST;
+
+/**
+ * ganv_node_can_tail:
+ *
+ * Return value: True iff node can act as the tail of an edge.
+ */
+gboolean
+ganv_node_can_tail(const GanvNode* node);
+
+/**
+ * ganv_node_can_head:
+ *
+ * Return value: True iff node can act as the head of an edge.
+ */
+gboolean
+ganv_node_can_head(const GanvNode* node);
+
+/**
+ * ganv_node_set_is_source:
+ *
+ * Flag a node as a source.  This information is used to influence layout.
+ */
+void
+ganv_node_set_is_source(const GanvNode* node, gboolean is_source);
+
+/**
+ * ganv_node_is_within:
+ *
+ * Return value: True iff node is entirely within the given rectangle.
+ */
+gboolean
+ganv_node_is_within(const GanvNode* node,
+                    double          x1,
+                    double          y1,
+                    double          x2,
+                    double          y2);
+
+const char* ganv_node_get_label(const GanvNode* node);
+
+double ganv_node_get_border_width(const GanvNode* node);
+
+void ganv_node_set_border_width(const GanvNode* node, double border_width);
+
+double ganv_node_get_dash_length(const GanvNode* node);
+
+void ganv_node_set_dash_length(const GanvNode* node, double dash_length);
+
+double ganv_node_get_dash_offset(const GanvNode* node);
+
+void ganv_node_set_dash_offset(const GanvNode* node, double dash_offset);
+
+guint ganv_node_get_fill_color(const GanvNode* node);
+
+void ganv_node_set_fill_color(const GanvNode* node, guint fill_color);
+
+guint ganv_node_get_border_color(const GanvNode* node);
+
+void ganv_node_set_border_color(const GanvNode* node, guint border_color);
+
+/**
+ * ganv_node_get_partner:
+ *
+ * Return value: (transfer none): The partner of @node.
+ */
+GanvNode*
+ganv_node_get_partner(const GanvNode* node);
+
+void ganv_node_set_label(GanvNode* node, const char* str);
+void ganv_node_set_show_label(GanvNode* node, gboolean show);
+
+void
+ganv_node_move(GanvNode* node,
+               double    dx,
+               double    dy);
+
+void
+ganv_node_move_to(GanvNode* node,
+                  double    x,
+                  double    y);
+
+void
+ganv_node_resize(GanvNode* node);
+
+void
+ganv_node_redraw_text(GanvNode* node);
+
+void
+ganv_node_disconnect(GanvNode* node);
+
+gboolean
+ganv_node_is_selected(GanvNode* node);
+
+G_END_DECLS
+
+#endif  /* GANV_NODE_H */
diff --git a/ganv/port.h b/ganv/port.h
new file mode 100644
index 0000000..03f4bb3
--- /dev/null
+++ b/ganv/port.h
@@ -0,0 +1,103 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2014 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_PORT_H
+#define GANV_PORT_H
+
+#include "ganv/box.h"
+
+struct _GanvModule;
+
+G_BEGIN_DECLS
+
+#define GANV_TYPE_PORT            (ganv_port_get_type())
+#define GANV_PORT(obj)            (GTK_CHECK_CAST((obj), GANV_TYPE_PORT, GanvPort))
+#define GANV_PORT_CLASS(klass)    (GTK_CHECK_CLASS_CAST((klass), GANV_TYPE_PORT, GanvPortClass))
+#define GANV_IS_PORT(obj)         (GTK_CHECK_TYPE((obj), GANV_TYPE_PORT))
+#define GANV_IS_PORT_CLASS(klass) (GTK_CHECK_CLASS_TYPE((klass), GANV_TYPE_PORT))
+#define GANV_PORT_GET_CLASS(obj)  (GTK_CHECK_GET_CLASS((obj), GANV_TYPE_PORT, GanvPortClass))
+
+typedef struct _GanvPortClass   GanvPortClass;
+typedef struct _GanvPortPrivate GanvPortPrivate;
+
+struct _GanvPort {
+	GanvBox          box;
+	GanvPortPrivate* impl;
+};
+
+struct _GanvPortClass {
+	GanvBoxClass parent_class;
+
+	/* Reserved for future expansion */
+	gpointer spare_vmethods[4];
+};
+
+GType ganv_port_get_type(void) G_GNUC_CONST;
+
+GanvPort*
+ganv_port_new(GanvModule* module,
+              gboolean    is_input,
+              const char* first_prop_name, ...);
+
+void
+ganv_port_set_value_label(GanvPort*   port,
+                          const char* str);
+
+void
+ganv_port_show_control(GanvPort* port);
+
+void
+ganv_port_hide_control(GanvPort* port);
+
+void
+ganv_port_set_control_is_toggle(GanvPort* port,
+                                gboolean  is_toggle);
+
+void
+ganv_port_set_control_is_integer(GanvPort* port,
+                                 gboolean  is_integer);
+
+void
+ganv_port_set_control_value(GanvPort* port,
+                            float     value);
+
+void
+ganv_port_set_control_min(GanvPort* port,
+                          float     min);
+
+void
+ganv_port_set_control_max(GanvPort* port,
+                          float     max);
+
+double
+ganv_port_get_natural_width(const GanvPort* port);
+
+/**
+ * ganv_port_get_module:
+ * @port: The port.
+ *
+ * Return value: (transfer none): The module @port is on.
+ */
+GanvModule* ganv_port_get_module(const GanvPort* port);
+
+float    ganv_port_get_control_value(const GanvPort* port);
+float    ganv_port_get_control_min(const GanvPort* port);
+float    ganv_port_get_control_max(const GanvPort* port);
+gboolean ganv_port_is_input(const GanvPort* port);
+gboolean ganv_port_is_output(const GanvPort* port);
+
+G_END_DECLS
+
+#endif  /* GANV_PORT_H */
diff --git a/ganv/text.h b/ganv/text.h
new file mode 100644
index 0000000..6f03a1b
--- /dev/null
+++ b/ganv/text.h
@@ -0,0 +1,52 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2014 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_TEXT_H
+#define GANV_TEXT_H
+
+#include "ganv/item.h"
+
+G_BEGIN_DECLS
+
+#define GANV_TYPE_TEXT            (ganv_text_get_type())
+#define GANV_TEXT(obj)            (GTK_CHECK_CAST((obj), GANV_TYPE_TEXT, GanvText))
+#define GANV_TEXT_CLASS(klass)    (GTK_CHECK_CLASS_CAST((klass), GANV_TYPE_TEXT, GanvTextClass))
+#define GANV_IS_TEXT(obj)         (GTK_CHECK_TYPE((obj), GANV_TYPE_TEXT))
+#define GANV_IS_TEXT_CLASS(klass) (GTK_CHECK_CLASS_TYPE((klass), GANV_TYPE_TEXT))
+#define GANV_TEXT_GET_CLASS(obj)  (GTK_CHECK_GET_CLASS((obj), GANV_TYPE_TEXT, GanvTextClass))
+
+typedef struct _GanvText        GanvText;
+typedef struct _GanvTextClass   GanvTextClass;
+typedef struct _GanvTextPrivate GanvTextPrivate;
+
+struct _GanvText {
+	GanvItem         item;
+	GanvTextPrivate* impl;
+};
+
+struct _GanvTextClass {
+	GanvItemClass parent_class;
+
+	/* Reserved for future expansion */
+	gpointer spare_vmethodsx[4];
+};
+
+GType ganv_text_get_type(void) G_GNUC_CONST;
+
+void ganv_text_layout(GanvText* text);
+
+G_END_DECLS
+
+#endif  /* GANV_TEXT_H */
diff --git a/ganv/types.h b/ganv/types.h
new file mode 100644
index 0000000..70c21ec
--- /dev/null
+++ b/ganv/types.h
@@ -0,0 +1,26 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2016 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_TYPES_H
+#define GANV_TYPES_H
+
+typedef struct _GanvCanvas GanvCanvas;
+typedef struct _GanvEdge   GanvEdge;
+typedef struct _GanvModule GanvModule;
+typedef struct _GanvNode   GanvNode;
+typedef struct _GanvPort   GanvPort;
+typedef struct _GanvBox    GanvBox;
+
+#endif  /* GANV_TYPES_H */
diff --git a/ganv/types.hpp b/ganv/types.hpp
new file mode 100644
index 0000000..280af16
--- /dev/null
+++ b/ganv/types.hpp
@@ -0,0 +1,30 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_TYPES_HPP
+#define GANV_TYPES_HPP
+
+namespace Ganv {
+
+class Canvas;
+class Edge;
+class Item;
+class Module;
+class Node;
+class Port;
+
+}; // namespace Ganv
+
+#endif // GANV_TYPES_HPP
diff --git a/ganv/widget.h b/ganv/widget.h
new file mode 100644
index 0000000..5b54ba4
--- /dev/null
+++ b/ganv/widget.h
@@ -0,0 +1,54 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2014 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Based on GnomeCanvasWidget, by Federico Mena <federico@nuclecu.unam.mx>
+ * Copyright 1997-2000 Free Software Foundation
+ */
+
+#ifndef GANV_WIDGET_H
+#define GANV_WIDGET_H
+
+#include "ganv/item.h"
+
+G_BEGIN_DECLS
+
+#define GANV_TYPE_WIDGET            (ganv_widget_get_type ())
+#define GANV_WIDGET(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GANV_TYPE_WIDGET, GanvWidget))
+#define GANV_WIDGET_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GANV_TYPE_WIDGET, GanvWidgetClass))
+#define GANV_IS_WIDGET(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GANV_TYPE_WIDGET))
+#define GANV_IS_WIDGET_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GANV_TYPE_WIDGET))
+#define GANV_WIDGET_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GANV_TYPE_WIDGET, GanvWidgetClass))
+
+typedef struct _GanvWidget        GanvWidget;
+typedef struct _GanvWidgetPrivate GanvWidgetPrivate;
+typedef struct _GanvWidgetClass   GanvWidgetClass;
+
+struct _GanvWidget {
+	GanvItem           item;
+	GanvWidgetPrivate* impl;
+};
+
+struct _GanvWidgetClass {
+	GanvItemClass parent_class;
+
+	/* Reserved for future expansion */
+	gpointer spare_vmethods [4];
+};
+
+GType ganv_widget_get_type(void) G_GNUC_CONST;
+
+G_END_DECLS
+
+#endif  /* GANV_WIDGET_H */
diff --git a/ganv/wrap.hpp b/ganv/wrap.hpp
new file mode 100644
index 0000000..26e04d1
--- /dev/null
+++ b/ganv/wrap.hpp
@@ -0,0 +1,131 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_WRAP_HPP
+#define GANV_WRAP_HPP
+
+#include <glib.h>
+
+#define CONNECT_PROP_SIGNAL(gobj, name, notify, handler) \
+	g_signal_connect(gobj, "notify::" #name, \
+	                 G_CALLBACK(notify), &_signal_##name); \
+	_signal_##name.connect(sigc::mem_fun(this, handler));
+
+#define SIGNAL1(name, argtype) \
+public: \
+	virtual bool on_##name(argtype arg) { return true; } \
+	sigc::signal<bool, argtype>& signal_##name() { return _signal_##name; } \
+private: \
+	sigc::signal<bool, argtype> _signal_##name;
+
+#define RW_PROPERTY(type, name) \
+	virtual type get_##name() const { \
+		type value; \
+		g_object_get(G_OBJECT(_gobj), #name, &value, NULL); \
+		return value; \
+	} \
+	virtual void set_##name(type value) { \
+		g_object_set(G_OBJECT(_gobj), #name, value, NULL); \
+	} \
+	SIGNAL1(name, type) \
+	public:
+
+#define RW_OBJECT_PROPERTY(type, name) \
+	type get_##name() const { \
+		if (!_gobj) return NULL; \
+		Ganv##type ptr; \
+		g_object_get(G_OBJECT(_gobj), #name, &ptr, NULL); \
+		return Glib::wrap(ptr); \
+	} \
+	void set_##name(type value) { \
+		if (!_gobj) return; \
+		ganv_item_set(GANV_ITEM(_gobj), \
+		              #name, value->gobj(), \
+		              NULL); \
+	}
+
+#define METHOD0(prefix, name) \
+	virtual void name() { \
+		prefix##_##name(gobj()); \
+	}
+
+#define METHOD1(prefix, name, t1, a1) \
+	virtual void name(t1 a1) { \
+		prefix##_##name(gobj(), a1); \
+	}
+
+#define METHODRET0(prefix, ret, name) \
+	virtual ret name() const { \
+		return prefix##_##name(gobj()); \
+	}
+
+#define METHODRET1(prefix, ret, name, t1, a1) \
+	virtual ret name(t1 a1) { \
+		return prefix##_##name(gobj(), a1); \
+	}
+
+#define METHODRET2(prefix, ret, name, t1, a1, t2, a2) \
+	virtual ret name(t1 a1, t2 a2) { \
+		return prefix##_##name(gobj(), a1, a2); \
+	}
+
+#define METHODRETWRAP0(prefix, ret, name) \
+	virtual ret name() const { \
+		if (gobj()) { \
+			return Glib::wrap(prefix##_##name(gobj())); \
+		} else { \
+			return NULL; \
+		} \
+	}
+
+#define METHOD2(prefix, name, t1, a1, t2, a2) \
+	virtual void name(t1 a1, t2 a2) { \
+		prefix##_##name(gobj(), a1, a2); \
+	}
+
+#define METHOD3(prefix, name, t1, a1, t2, a2, t3, a3) \
+	virtual void name(t1 a1, t2 a2, t3 a3) { \
+		prefix##_##name(gobj(), a1, a2, a3); \
+	}
+
+#define METHOD4(prefix, name, t1, a1, t2, a2, t3, a3, t4, a4) \
+	virtual void name(t1 a1, t2 a2, t3 a3, t4 a4) { \
+		prefix##_##name(gobj(), a1, a2, a3, a4); \
+	}
+
+#define GANV_GLIB_WRAP(Name) \
+	namespace Ganv { \
+	class Name; \
+	} \
+	namespace Glib { \
+	/** Return a Ganv::CPPType wrapper for a CType. */ \
+	static inline Ganv::Name* \
+	wrap(Ganv##Name* gobj) \
+	{ \
+		if (gobj) { \
+			return (Ganv::Name*)ganv_item_get_wrapper(GANV_ITEM(gobj)); \
+		} else { \
+			return NULL; \
+		} \
+	} \
+	/** Return a Ganv::CPPType wrapper for a CType. */ \
+	static inline const Ganv::Name* \
+	wrap(const Ganv##Name* gobj) \
+	{ \
+		return wrap((Ganv##Name*)gobj); \
+	} \
+	}
+
+#endif  // GANV_WRAP_HPP
diff --git a/gtkdoc.sh b/gtkdoc.sh
new file mode 100755
index 0000000..42ff39d
--- /dev/null
+++ b/gtkdoc.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+DOC_MODULE=ganv
+
+pwd=`pwd`
+echo "gtkdoc.sh: Entering directory \`$pwd/docs'"
+
+mkdir -p docs
+cd docs
+
+export CFLAGS="`pkg-config --cflags ganv-1`"
+export LDFLAGS="`pkg-config --libs ganv-1`"
+
+# Sources have changed
+
+gtkdoc-scan --rebuild-sections --rebuild-types --ignore-headers=types.h --module=$DOC_MODULE --source-dir=../ganv
+gtkdoc-scangobj --module=$DOC_MODULE
+gtkdoc-mkdb --module=$DOC_MODULE --output-format=xml --source-dir=../ganv
+
+# XML files have changed
+mkdir -p html
+cd html && gtkdoc-mkhtml $DOC_MODULE ../ganv-docs.xml && cd -
+gtkdoc-fixxref --module=$DOC_MODULE --module-dir=html
+
+echo "gtkdoc.sh: Leaving directory \`$pwd/docs'"
+cd -
diff --git a/src/Canvas.cpp b/src/Canvas.cpp
new file mode 100644
index 0000000..6a18cdc
--- /dev/null
+++ b/src/Canvas.cpp
@@ -0,0 +1,4184 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2016 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Parts based on GnomeCanvas, by Federico Mena <federico@nuclecu.unam.mx>
+ * and Raph Levien <raph@gimp.org>
+ * Copyright 1997-2000 Free Software Foundation
+ */
+
+#define _POSIX_C_SOURCE 200809L // strdup
+#define _XOPEN_SOURCE   600 // isascii on BSD
+
+#include <math.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <algorithm>
+#include <cassert>
+#include <cmath>
+#include <iostream>
+#include <map>
+#include <set>
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include <cairo.h>
+#include <gdk/gdkkeysyms.h>
+#include <gtk/gtk.h>
+#include <gtk/gtkstyle.h>
+#include <gtkmm/widget.h>
+
+#include "ganv/Canvas.hpp"
+#include "ganv/Circle.hpp"
+#include "ganv/Edge.hpp"
+#include "ganv/Module.hpp"
+#include "ganv/Port.hpp"
+#include "ganv/box.h"
+#include "ganv/canvas.h"
+#include "ganv/edge.h"
+#include "ganv/group.h"
+#include "ganv/node.h"
+#include "ganv_config.h"
+
+#include "./color.h"
+#include "./ganv-marshal.h"
+#include "./ganv-private.h"
+#include "./gettext.h"
+
+#ifdef HAVE_AGRAPH
+// Deal with graphviz API amateur hour...
+#    define _DLL_BLD 0
+#    define _dll_import 0
+#    define _BLD_cdt 0
+#    define _PACKAGE_ast 0
+#    include <gvc.h>
+#endif
+#ifdef GANV_FDGL
+#    include "./fdgl.hpp"
+#endif
+
+#define CANVAS_IDLE_PRIORITY (GDK_PRIORITY_REDRAW - 5)
+
+static const double GANV_CANVAS_PAD = 8.0;
+
+typedef struct {
+	int x;
+	int y;
+	int width;
+	int height;
+} IRect;
+
+extern "C" {
+static void add_idle(GanvCanvas* canvas);
+static void ganv_canvas_destroy(GtkObject* object);
+static void ganv_canvas_map(GtkWidget* widget);
+static void ganv_canvas_unmap(GtkWidget* widget);
+static void ganv_canvas_realize(GtkWidget* widget);
+static void ganv_canvas_unrealize(GtkWidget* widget);
+static void ganv_canvas_size_allocate(GtkWidget*     widget,
+                                      GtkAllocation* allocation);
+static gint ganv_canvas_button(GtkWidget*      widget,
+                               GdkEventButton* event);
+static gint ganv_canvas_motion(GtkWidget*      widget,
+                               GdkEventMotion* event);
+static gint ganv_canvas_expose(GtkWidget*      widget,
+                               GdkEventExpose* event);
+static gboolean ganv_canvas_key(GtkWidget*   widget,
+                                GdkEventKey* event);
+static gboolean ganv_canvas_scroll(GtkWidget*      widget,
+                                   GdkEventScroll* event);
+static gint ganv_canvas_crossing(GtkWidget*        widget,
+                                 GdkEventCrossing* event);
+static gint ganv_canvas_focus_in(GtkWidget*     widget,
+                                 GdkEventFocus* event);
+static gint ganv_canvas_focus_out(GtkWidget*     widget,
+                                  GdkEventFocus* event);
+
+static GtkLayoutClass* canvas_parent_class;
+}
+
+static guint signal_connect;
+static guint signal_disconnect;
+
+static GEnumValue dir_values[3];
+
+typedef std::set<GanvNode*> Items;
+
+#define FOREACH_ITEM(items, i) \
+	for (Items::const_iterator i = items.begin(); i != items.end(); ++i)
+
+#define FOREACH_ITEM_MUT(items, i) \
+	for (Items::iterator i = items.begin(); i != items.end(); ++i)
+
+#define FOREACH_EDGE(edges, i) \
+	for (GanvCanvasImpl::Edges::const_iterator i = edges.begin(); \
+	     i != edges.end(); \
+	     ++i)
+
+#define FOREACH_EDGE_MUT(edges, i) \
+	for (GanvCanvasImpl::Edges::iterator i = edges.begin(); \
+	     i != edges.end(); \
+	     ++i)
+
+#define FOREACH_SELECTED_EDGE(edges, i) \
+	for (GanvCanvasImpl::SelectedEdges::const_iterator i = edges.begin(); \
+	     i != edges.end(); \
+	     ++i)
+
+#define FOREACH_SELECTED_PORT(p) \
+	for (SelectedPorts::iterator p = _selected_ports.begin(); \
+	     p != _selected_ports.end(); ++p)
+
+#ifdef HAVE_AGRAPH
+class GVNodes : public std::map<GanvNode*, Agnode_t*> {
+public:
+	GVNodes() : gvc(0), G(0) {}
+
+	void cleanup() {
+		gvFreeLayout(gvc, G);
+		agclose (G);
+		gvc = 0;
+		G = 0;
+	}
+
+	GVC_t*    gvc;
+	Agraph_t* G;
+};
+#endif
+
+static const uint32_t SELECT_RECT_FILL_COLOUR   = 0x2E444577;
+static const uint32_t SELECT_RECT_BORDER_COLOUR = 0x2E4445FF;
+
+/* Order edges by (tail, head) */
+struct TailHeadOrder {
+	inline bool operator()(const GanvEdge* a, const GanvEdge* b) const {
+		return ((a->impl->tail < b->impl->tail)
+		        || (a->impl->tail == b->impl->tail
+		            && a->impl->head < b->impl->head));
+	}
+};
+
+/* Order edges by (head, tail) */
+struct HeadTailOrder {
+	inline bool operator()(const GanvEdge* a, const GanvEdge* b) const {
+		return ((a->impl->head < b->impl->head)
+		        || (a->impl->head == b->impl->head
+		            && a->impl->tail < b->impl->tail));
+	}
+};
+
+/* Callback used when the root item of a canvas is destroyed.  The user should
+ * never ever do this, so we panic if this happens.
+ */
+static void
+panic_root_destroyed(GtkObject* object, gpointer data)
+{
+	g_error("Eeeek, root item %p of canvas %p was destroyed!", (void*)object, data);
+}
+
+struct GanvCanvasImpl {
+	GanvCanvasImpl(GanvCanvas* canvas)
+		: _gcanvas(canvas)
+		, _wrapper(NULL)
+		, _connect_port(NULL)
+		, _last_selected_port(NULL)
+		, _drag_edge(NULL)
+		, _drag_node(NULL)
+		, _select_rect(NULL)
+		, _select_start_x(0.0)
+		, _select_start_y(0.0)
+		, _drag_state(NOT_DRAGGING)
+	{
+		this->root               = GANV_ITEM(g_object_new(ganv_group_get_type(), NULL));
+		this->root->impl->canvas = canvas;
+		g_object_ref_sink(this->root);
+
+		this->direction = GANV_DIRECTION_RIGHT;
+		this->width     = 0;
+		this->height    = 0;
+
+		this->redraw_region    = NULL;
+		this->current_item     = NULL;
+		this->new_current_item = NULL;
+		this->grabbed_item     = NULL;
+		this->focused_item     = NULL;
+		this->pixmap_gc        = NULL;
+
+		this->pick_event.type       = GDK_LEAVE_NOTIFY;
+		this->pick_event.crossing.x = 0;
+		this->pick_event.crossing.y = 0;
+
+		this->scroll_x1 = 0.0;
+		this->scroll_y1 = 0.0;
+		this->scroll_x2 = canvas->layout.width;
+		this->scroll_y2 = canvas->layout.height;
+
+		this->pixels_per_unit = 1.0;
+		this->font_size       = ganv_canvas_get_default_font_size(canvas);
+
+		this->idle_id         = 0;
+		this->root_destroy_id = g_signal_connect(
+			this->root, "destroy", G_CALLBACK(panic_root_destroyed), canvas);
+
+		this->redraw_x1 = 0;
+		this->redraw_y1 = 0;
+		this->redraw_x2 = 0;
+		this->redraw_y2 = 0;
+
+		this->draw_xofs = 0;
+		this->draw_yofs = 0;
+		this->zoom_xofs = 0;
+		this->zoom_yofs = 0;
+
+		this->state              = 0;
+		this->grabbed_event_mask = 0;
+
+		this->center_scroll_region = FALSE;
+		this->need_update          = FALSE;
+		this->need_redraw          = FALSE;
+		this->need_repick          = TRUE;
+		this->left_grabbed_item    = FALSE;
+		this->in_repick            = FALSE;
+		this->locked               = FALSE;
+		this->exporting            = FALSE;
+
+#ifdef GANV_FDGL
+		this->layout_idle_id = 0;
+		this->layout_energy  = 0.4;
+		this->sprung_layout  = FALSE;
+#endif
+
+		_animate_idle_id = 0;
+
+		_port_order.port_cmp = NULL;
+		_port_order.data     = NULL;
+
+		gtk_layout_set_hadjustment(GTK_LAYOUT(canvas), NULL);
+		gtk_layout_set_vadjustment(GTK_LAYOUT(canvas), NULL);
+
+		_move_cursor = gdk_cursor_new(GDK_FLEUR);
+	}
+
+	~GanvCanvasImpl()
+	{
+		if (_animate_idle_id) {
+			g_source_remove(_animate_idle_id);
+			_animate_idle_id = 0;
+		}
+
+		while (g_idle_remove_by_data(this)) {}
+		ganv_canvas_clear(_gcanvas);
+		gdk_cursor_unref(_move_cursor);
+	}
+
+	static gboolean on_animate_timeout(gpointer impl);
+
+#ifdef GANV_FDGL
+	static gboolean on_layout_timeout(gpointer impl) {
+		return ((GanvCanvasImpl*)impl)->layout_iteration();
+	}
+
+	static void on_layout_done(gpointer impl) {
+		((GanvCanvasImpl*)impl)->layout_idle_id = 0;
+	}
+
+	gboolean layout_iteration();
+	gboolean layout_calculate(double dur, bool update);
+#endif
+
+	void unselect_ports();
+
+#ifdef HAVE_AGRAPH
+	GVNodes layout_dot(const std::string& filename);
+#endif
+
+	typedef std::set<GanvEdge*, TailHeadOrder> Edges;
+	typedef std::set<GanvEdge*, HeadTailOrder> DstEdges;
+	typedef std::set<GanvEdge*>                SelectedEdges;
+	typedef std::set<GanvPort*>                SelectedPorts;
+
+	Edges::const_iterator    first_edge_from(const GanvNode* src);
+	DstEdges::const_iterator first_edge_to(const GanvNode* dst);
+
+	void select_port(GanvPort* p, bool unique=false);
+	void select_port_toggle(GanvPort* p, int mod_state);
+	void unselect_port(GanvPort* p);
+	void selection_joined_with(GanvPort* port);
+	void join_selection();
+
+	GanvNode* get_node_at(double x, double y);
+
+	bool on_event(GdkEvent* event);
+
+	bool scroll_drag_handler(GdkEvent* event);
+	bool select_drag_handler(GdkEvent* event);
+	bool connect_drag_handler(GdkEvent* event);
+	void end_connect_drag();
+
+	/*
+	  Event handler for ports.
+
+	  This must be implemented as a Canvas method since port event handling
+	  depends on shared data (for selection and connecting).  This function
+	  should only be used by Port implementations.
+	*/
+	bool port_event(GdkEvent* event, GanvPort* port);
+
+	void ports_joined(GanvPort* port1, GanvPort* port2);
+	void port_clicked(GdkEvent* event, GanvPort* port);
+	void highlight_port(GanvPort* port, bool highlight);
+
+	void move_contents_to_internal(double x, double y, double min_x, double min_y);
+
+	GanvCanvas*   _gcanvas;
+	Ganv::Canvas* _wrapper;
+
+	Items         _items;       ///< Items on this canvas
+	Edges         _edges;       ///< Edges ordered (src, dst)
+	DstEdges      _dst_edges;   ///< Edges ordered (dst, src)
+	Items         _selected_items; ///< Currently selected items
+	SelectedEdges _selected_edges; ///< Currently selected edges
+
+	SelectedPorts _selected_ports; ///< Selected ports (hilited red)
+	GanvPort*     _connect_port; ///< Port for which a edge is being made
+	GanvPort*     _last_selected_port;
+	GanvEdge*     _drag_edge;
+	GanvNode*     _drag_node;
+
+	GanvBox* _select_rect;     ///< Rectangle for drag selection
+	double   _select_start_x;  ///< Selection drag start x coordinate
+	double   _select_start_y;  ///< Selection drag start y coordinate
+
+	enum DragState { NOT_DRAGGING, EDGE, SCROLL, SELECT };
+	DragState      _drag_state;
+
+	GdkCursor* _move_cursor;
+	guint      _animate_idle_id;
+
+	PortOrderCtx _port_order;
+
+	/* Root canvas item */
+	GanvItem* root;
+
+	/* Flow direction */
+	GanvDirection direction;
+
+	/* Canvas width */
+	double width;
+
+	/* Canvas height */
+	double height;
+
+	/* Region that needs redrawing (list of rectangles) */
+	GSList* redraw_region;
+
+	/* The item containing the mouse pointer, or NULL if none */
+	GanvItem* current_item;
+
+	/* Item that is about to become current (used to track deletions and such) */
+	GanvItem* new_current_item;
+
+	/* Item that holds a pointer grab, or NULL if none */
+	GanvItem* grabbed_item;
+
+	/* If non-NULL, the currently focused item */
+	GanvItem* focused_item;
+
+	/* GC for temporary draw pixmap */
+	GdkGC* pixmap_gc;
+
+	/* Event on which selection of current item is based */
+	GdkEvent pick_event;
+
+	/* Scrolling region */
+	double scroll_x1;
+	double scroll_y1;
+	double scroll_x2;
+	double scroll_y2;
+
+	/* Scaling factor to be used for display */
+	double pixels_per_unit;
+
+	/* Font size in points */
+	double font_size;
+
+	/* Idle handler ID */
+	guint idle_id;
+
+	/* Signal handler ID for destruction of the root item */
+	guint root_destroy_id;
+
+	/* Area that is being redrawn.  Contains (x1, y1) but not (x2, y2).
+	 * Specified in canvas pixel coordinates.
+	 */
+	int redraw_x1;
+	int redraw_y1;
+	int redraw_x2;
+	int redraw_y2;
+
+	/* Offsets of the temprary drawing pixmap */
+	int draw_xofs;
+	int draw_yofs;
+
+	/* Internal pixel offsets when zoomed out */
+	int zoom_xofs;
+	int zoom_yofs;
+
+	/* Last known modifier state, for deferred repick when a button is down */
+	int state;
+
+	/* Event mask specified when grabbing an item */
+	guint grabbed_event_mask;
+
+	/* Whether the canvas should center the scroll region in the middle of
+	 * the window if the scroll region is smaller than the window.
+	 */
+	gboolean center_scroll_region;
+
+	/* Whether items need update at next idle loop iteration */
+	gboolean need_update;
+
+	/* Whether the canvas needs redrawing at the next idle loop iteration */
+	gboolean need_redraw;
+
+	/* Whether current item will be repicked at next idle loop iteration */
+	gboolean need_repick;
+
+	/* For use by internal pick_current_item() function */
+	gboolean left_grabbed_item;
+
+	/* For use by internal pick_current_item() function */
+	gboolean in_repick;
+
+	/* Disable changes to canvas */
+	gboolean locked;
+
+	/* True if the current draw is an export */
+	gboolean exporting;
+
+#ifdef GANV_FDGL
+	guint    layout_idle_id;
+	gdouble  layout_energy;
+	gboolean sprung_layout;
+#endif
+};
+
+typedef struct {
+	GanvItem         item;
+	GanvEdgePrivate* impl;
+	GanvEdgePrivate  impl_data;
+} GanvEdgeKey;
+
+static void
+make_edge_search_key(GanvEdgeKey*    key,
+                     const GanvNode* tail,
+                     const GanvNode* head)
+{
+	memset(key, '\0', sizeof(GanvEdgeKey));
+	key->impl = &key->impl_data;
+	key->impl->tail = const_cast<GanvNode*>(tail);
+	key->impl->head = const_cast<GanvNode*>(head);
+}
+
+GanvCanvasImpl::Edges::const_iterator
+GanvCanvasImpl::first_edge_from(const GanvNode* tail)
+{
+	GanvEdgeKey key;
+	make_edge_search_key(&key, tail, NULL);
+	return _edges.lower_bound((GanvEdge*)&key);
+}
+
+GanvCanvasImpl::DstEdges::const_iterator
+GanvCanvasImpl::first_edge_to(const GanvNode* head)
+{
+	GanvEdgeKey key;
+	make_edge_search_key(&key, NULL, head);
+	return _dst_edges.lower_bound((GanvEdge*)&key);
+}
+
+static void
+select_if_tail_is_selected(GanvEdge* edge, void* data)
+{
+	GanvNode* tail = edge->impl->tail;
+	gboolean  selected;
+	g_object_get(tail, "selected", &selected, NULL);
+	if (!selected && GANV_IS_PORT(tail)) {
+		g_object_get(ganv_port_get_module(GANV_PORT(tail)),
+		             "selected", &selected, NULL);
+	}
+
+	if (selected) {
+		ganv_edge_select(edge);
+	}
+}
+
+static void
+select_if_head_is_selected(GanvEdge* edge, void* data)
+{
+	GanvNode* head = edge->impl->head;
+	gboolean  selected;
+	g_object_get(head, "selected", &selected, NULL);
+	if (!selected && GANV_IS_PORT(head)) {
+		g_object_get(ganv_port_get_module(GANV_PORT(head)),
+		             "selected", &selected, NULL);
+	}
+
+	if (selected) {
+		ganv_edge_set_selected(edge, TRUE);
+	}
+}
+
+static void
+select_edges(GanvPort* port, void* data)
+{
+	GanvCanvasImpl* impl = (GanvCanvasImpl*)data;
+	if (port->impl->is_input) {
+		ganv_canvas_for_each_edge_to(impl->_gcanvas,
+		                             GANV_NODE(port),
+		                             select_if_tail_is_selected,
+		                             NULL);
+	} else {
+		ganv_canvas_for_each_edge_from(impl->_gcanvas,
+		                               GANV_NODE(port),
+		                               select_if_head_is_selected,
+		                               NULL);
+	}
+}
+
+#ifdef HAVE_AGRAPH
+static void
+gv_set(void* subject, const char* key, double value)
+{
+	std::ostringstream ss;
+	ss << value;
+	agsafeset(subject, (char*)key, (char*)ss.str().c_str(), (char*)"");
+}
+
+GVNodes
+GanvCanvasImpl::layout_dot(const std::string& filename)
+{
+	GVNodes nodes;
+
+	const double dpi = gdk_screen_get_resolution(gdk_screen_get_default());
+
+	GVC_t* gvc = gvContext();
+
+	Agraph_t* G = agopen((char*)"g", Agdirected, NULL);
+
+	agsafeset(G, (char*)"splines", (char*)"false", (char*)"");
+	agsafeset(G, (char*)"compound", (char*)"true", (char*)"");
+	agsafeset(G, (char*)"remincross", (char*)"true", (char*)"");
+	agsafeset(G, (char*)"overlap", (char*)"scale", (char*)"");
+	agsafeset(G, (char*)"nodesep", (char*)"0.05", (char*)"");
+	gv_set(G, "fontsize", ganv_canvas_get_font_size(_gcanvas));
+	gv_set(G, "dpi", dpi);
+
+	nodes.gvc = gvc;
+	nodes.G   = G;
+
+	const bool flow_right = _gcanvas->impl->direction;
+	if (flow_right) {
+		agattr(G, AGRAPH, (char*)"rankdir", (char*)"LR");
+	} else {
+		agattr(G, AGRAPH, (char*)"rankdir", (char*)"TD");
+	}
+
+	unsigned id = 0;
+	std::ostringstream ss;
+	FOREACH_ITEM(_items, i) {
+		ss.str("");
+		ss << "n" << id++;
+		const std::string node_id = ss.str();
+
+		Agnode_t* node = agnode(G, strdup(node_id.c_str()), true);
+		nodes.insert(std::make_pair(*i, node));
+
+		if (GANV_IS_MODULE(*i)) {
+			GanvModule* const m = GANV_MODULE(*i);
+
+			agsafeset(node, (char*)"shape", (char*)"plaintext", (char*)"");
+			gv_set(node, "width", ganv_box_get_width(GANV_BOX(*i)) / dpi);
+			gv_set(node, "height", ganv_box_get_height(GANV_BOX(*i)) / dpi);
+
+			std::string inputs;   // Down flow
+			std::string outputs;  // Down flow
+			std::string ports;    // Right flow
+			unsigned    n_inputs  = 0;
+			unsigned    n_outputs = 0;
+			for (size_t i = 0; i < ganv_module_num_ports(m); ++i) {
+				GanvPort* port = ganv_module_get_port(m, i);
+				ss.str("");
+				ss << port;
+
+				if (port->impl->is_input) {
+					++n_inputs;
+				} else {
+					++n_outputs;
+				}
+
+				std::string cell = std::string("<TD PORT=\"") + ss.str() + "\"";
+
+				cell += " FIXEDSIZE=\"TRUE\"";
+				ss.str("");
+				ss << ganv_box_get_width(GANV_BOX(port));// / dpp * 1.3333333;
+				cell += " WIDTH=\"" + ss.str() + "\"";
+
+				ss.str("");
+				ss << ganv_box_get_height(GANV_BOX(port));// / dpp * 1.333333;
+				cell += " HEIGHT=\"" + ss.str() + "\"";
+
+				cell += ">";
+				const char* label = ganv_node_get_label(GANV_NODE(port));
+				if (label && flow_right) {
+					cell += label;
+				}
+				cell += "</TD>";
+
+				if (flow_right) {
+					ports += "<TR>" + cell + "</TR>";
+				} else if (port->impl->is_input) {
+					inputs += cell;
+				} else {
+					outputs += cell;
+				}
+
+				nodes.insert(std::make_pair(GANV_NODE(port), node));
+			}
+
+			const unsigned n_cols = std::max(n_inputs, n_outputs);
+
+			std::string html = "<TABLE CELLPADDING=\"0\" CELLSPACING=\"0\">";
+
+			// Input row (down flow only)
+			if (!inputs.empty()) {
+				for (unsigned i = n_inputs; i < n_cols + 1; ++i) {
+					inputs += "<TD BORDER=\"0\"></TD>";
+				}
+				html += std::string("<TR>") + inputs + "</TR>";
+			}
+
+			// Label row
+			std::stringstream colspan;
+			colspan << (flow_right ? 1 : (n_cols + 1));
+			html += std::string("<TR><TD BORDER=\"0\" CELLPADDING=\"2\" COLSPAN=\"")
+				+ colspan.str()
+				+ "\">";
+			const char* label = ganv_node_get_label(GANV_NODE(m));
+			if (label) {
+				html += label;
+			}
+			html += "</TD></TR>";
+
+			// Ports rows (right flow only)
+			if (!ports.empty()) {
+				html += ports;
+			}
+
+			// Output row (down flow only)
+			if (!outputs.empty()) {
+				for (unsigned i = n_outputs; i < n_cols + 1; ++i) {
+					outputs += "<TD BORDER=\"0\"></TD>";
+				}
+				html += std::string("<TR>") + outputs + "</TR>";
+			}
+			html += "</TABLE>";
+
+			char* html_label_str = agstrdup_html(G, (char*)html.c_str());
+
+			agsafeset(node, (char*)"label", (char*)html_label_str, (char*)"");
+		} else if (GANV_IS_CIRCLE(*i)) {
+			agsafeset(node, (char*)"shape", (char*)"circle", (char*)"");
+			agsafeset(node, (char*)"fixedsize", (char*)"true", (char*)"");
+			agsafeset(node, (char*)"margin", (char*)"0.0,0.0", (char*)"");
+
+			const double radius   = ganv_circle_get_radius(GANV_CIRCLE(*i));
+			const double penwidth = ganv_node_get_border_width(GANV_NODE(*i));
+			const double span     = (radius + penwidth) * 2.3 / dpi;
+			gv_set(node, (char*)"width", span);
+			gv_set(node, (char*)"height", span);
+			gv_set(node, (char*)"penwidth", penwidth);
+
+			if (ganv_node_get_dash_length(GANV_NODE(*i)) > 0.0) {
+				agsafeset(node, (char*)"style", (char*)"dashed", (char*)"");
+			}
+
+			const char* label = ganv_node_get_label(GANV_NODE(*i));
+			if (label) {
+				agsafeset(node, (char*)"label", (char*)label, (char*)"");
+			} else {
+				agsafeset(node, (char*)"label", (char*)"", (char*)"");
+			}
+		} else {
+			std::cerr << "Unable to arrange item of unknown type" << std::endl;
+		}
+	}
+
+	FOREACH_EDGE(_edges, i) {
+		const GanvEdge* const edge   = *i;
+		GVNodes::iterator     tail_i = nodes.find(edge->impl->tail);
+		GVNodes::iterator     head_i = nodes.find(edge->impl->head);
+
+		if (tail_i != nodes.end() && head_i != nodes.end()) {
+			Agedge_t* e = agedge(G, tail_i->second, head_i->second, NULL, true);
+			if (GANV_IS_PORT(edge->impl->tail)) {
+				ss.str((char*)"");
+				ss << edge->impl->tail << (flow_right ? ":e" : ":s");
+				agsafeset(e, (char*)"tailport", (char*)ss.str().c_str(), (char*)"");
+			}
+			if (GANV_IS_PORT(edge->impl->head)) {
+				ss.str((char*)"");
+				ss << edge->impl->head << (flow_right ? ":w" : ":n");
+				agsafeset(e, (char*)"headport", (char*)ss.str().c_str(), (char*)"");
+			}
+			if (!ganv_edge_get_constraining(edge)) {
+				agsafeset(e, (char*)"constraint", (char*)"false", (char*)"");
+			}
+		} else {
+			std::cerr << "Unable to find graphviz node" << std::endl;
+		}
+	}
+
+	// Add edges between partners to have them lined up as if connected
+	for (GVNodes::iterator i = nodes.begin(); i != nodes.end(); ++i) {
+		GanvNode* partner = ganv_node_get_partner(i->first);
+		if (partner) {
+			GVNodes::iterator p = nodes.find(partner);
+			if (p != nodes.end()) {
+				Agedge_t* e = agedge(G, i->second, p->second, NULL, true);
+				agsafeset(e, (char*)"style", (char*)"invis", (char*)"");
+			}
+		}
+	}
+
+	gvLayout(gvc, G, (char*)"dot");
+	FILE* tmp = fopen("/dev/null", "w");
+	gvRender(gvc, G, (char*)"dot", tmp);
+	fclose(tmp);
+
+	if (filename != "") {
+		FILE* fd = fopen(filename.c_str(), "w");
+		gvRender(gvc, G, (char*)"dot", fd);
+		fclose(fd);
+	}
+
+	return nodes;
+}
+#endif
+
+inline uint64_t
+get_monotonic_time()
+{
+#if GLIB_CHECK_VERSION(2, 28, 0)
+	return g_get_monotonic_time();
+#else
+	GTimeVal time;
+	g_get_current_time(&time);
+	return time.tv_sec + time.tv_usec;
+#endif
+}
+
+#ifdef GANV_FDGL
+
+inline Region
+get_region(GanvNode* node)
+{
+	GanvItem* item = &node->item;
+
+	double x1, y1, x2, y2;
+	ganv_item_get_bounds(item, &x1, &y1, &x2, &y2);
+
+	Region reg;
+	ganv_item_get_bounds(item, &reg.pos.x, &reg.pos.y, &reg.area.x, &reg.area.y);
+	reg.area.x = x2 - x1;
+	reg.area.y = y2 - y1;
+	reg.pos.x  = item->impl->x + (reg.area.x / 2.0);
+	reg.pos.y  = item->impl->y + (reg.area.y / 2.0);
+
+	// No need for i2w here since we only care about top-level items
+	return reg;
+}
+
+inline void
+apply_force(GanvNode* a, GanvNode* b, const Vector& f)
+{
+	a->impl->force = vec_add(a->impl->force, f);
+	b->impl->force = vec_sub(b->impl->force, f);
+}
+
+gboolean
+GanvCanvasImpl::layout_iteration()
+{
+	if (_drag_state == EDGE) {
+		return FALSE;  // Canvas is locked, halt layout process
+	} else if (!sprung_layout) {
+		return FALSE;  // We shouldn't be running at all
+	}
+
+	static const double T_PER_US = .0001;  // Sym time per real microsecond
+
+	static uint64_t prev = 0;  // Previous iteration time
+
+	const uint64_t now         = get_monotonic_time();
+	const double   time_to_run = std::min((now - prev) * T_PER_US, 10.0);
+
+	prev = now;
+
+	const double QUANTUM  = 0.05;
+	double       sym_time = 0.0;
+	while (sym_time + QUANTUM < time_to_run) {
+		if (!layout_calculate(QUANTUM, FALSE)) {
+			break;
+		}
+		sym_time += QUANTUM;
+	}
+
+	return layout_calculate(QUANTUM, TRUE);
+}
+
+gboolean
+GanvCanvasImpl::layout_calculate(double dur, bool update)
+{
+	// A light directional force to push sources to the top left
+	static const double DIR_MAGNITUDE = -1000.0;
+	Vector              dir           = { 0.0, 0.0 };
+	switch (_gcanvas->impl->direction) {
+	case GANV_DIRECTION_RIGHT: dir.x = DIR_MAGNITUDE; break;
+	case GANV_DIRECTION_DOWN:  dir.y = DIR_MAGNITUDE; break;
+	}
+
+	// Calculate attractive spring forces for edges
+	FOREACH_EDGE(_edges, i) {
+		const GanvEdge* const edge = *i;
+		if (!ganv_edge_get_constraining(edge)) {
+			continue;
+		}
+
+		GanvNode* tail = ganv_edge_get_tail(edge);
+		GanvNode* head = ganv_edge_get_head(edge);
+		if (GANV_IS_PORT(tail)) {
+			tail = GANV_NODE(ganv_port_get_module(GANV_PORT(tail)));
+		}
+		if (GANV_IS_PORT(head)) {
+			head = GANV_NODE(ganv_port_get_module(GANV_PORT(head)));
+		}
+		if (tail == head) {
+			continue;
+		}
+
+		head->impl->connected = tail->impl->connected = TRUE;
+
+		GanvEdgeCoords coords;
+		ganv_edge_get_coords(edge, &coords);
+
+		const Vector tpos = { coords.x1, coords.y1 };
+		const Vector hpos = { coords.x2, coords.y2 };
+		apply_force(tail, head, edge_force(dir, hpos, tpos));
+	}
+
+	// Calculate repelling forces between nodes
+	FOREACH_ITEM(_items, i) {
+		if (!GANV_IS_MODULE(*i) && !GANV_IS_CIRCLE(*i)) {
+			continue;
+		}
+
+		GanvNode* const node    = *i;
+		GanvNode*       partner = ganv_node_get_partner(node);
+		if (!partner && !node->impl->connected) {
+			continue;
+		}
+
+		const Region reg = get_region(node);
+		if (partner) {
+			// Add fake long spring to partner to line up as if connected
+			const Region preg = get_region(partner);
+			apply_force(node, partner, edge_force(dir, preg.pos, reg.pos));
+		}
+
+		/* Add tide force which pulls all objects as if the layout is happening
+		   on a flowing river surface.  This prevents disconnected components
+		   from being ejected, since at some point the tide force will be
+		   greater than distant repelling charges. */
+		const Vector mouth = { -100000.0, -100000.0 };
+		node->impl->force = vec_add(
+			node->impl->force,
+			tide_force(mouth, reg.pos, 4000000000000.0));
+
+		// Add slight noise to force to limit oscillation
+		const Vector noise = { rand() / (float)RAND_MAX * 128.0,
+		                       rand() / (float)RAND_MAX * 128.0 };
+		node->impl->force = vec_add(noise, node->impl->force);
+
+		FOREACH_ITEM(_items, j) {
+			if (i == j || (!GANV_IS_MODULE(*i) && !GANV_IS_CIRCLE(*i))) {
+				continue;
+			}
+			apply_force(node, *j, repel_force(reg, get_region(*j)));
+		}
+	}
+
+	// Update positions based on calculated forces
+	size_t n_moved = 0;
+	FOREACH_ITEM(_items, i) {
+		if (!GANV_IS_MODULE(*i) && !GANV_IS_CIRCLE(*i)) {
+			continue;
+		}
+
+		GanvNode* const node = *i;
+
+		if (node->impl->grabbed ||
+		    (!node->impl->connected && !ganv_node_get_partner(node))) {
+			node->impl->vel.x = 0.0;
+			node->impl->vel.y = 0.0;
+		} else {
+			node->impl->vel = vec_add(node->impl->vel,
+			                          vec_mult(node->impl->force, dur));
+			node->impl->vel = vec_mult(node->impl->vel, layout_energy);
+
+			static const double MAX_VEL   = 1000.0;
+			static const double MIN_COORD = 4.0;
+
+			// Clamp velocity
+			const double vel_mag = vec_mag(node->impl->vel);
+			if (vel_mag > MAX_VEL) {
+				node->impl->vel = vec_mult(
+					vec_mult(node->impl->vel, 1.0 / vel_mag),
+					MAX_VEL);
+			}
+
+			// Update position
+			GanvItem*    item = &node->item;
+			const double x0   = item->impl->x;
+			const double y0   = item->impl->y;
+			const Vector dpos = vec_mult(node->impl->vel, dur);
+
+			item->impl->x = std::max(MIN_COORD, item->impl->x + dpos.x);
+			item->impl->y = std::max(MIN_COORD, item->impl->y + dpos.y);
+
+			if (update) {
+				ganv_item_request_update(item);
+				item->impl->canvas->impl->need_repick = TRUE;
+			}
+
+			if (lrint(x0) != lrint(item->impl->x) || lrint(y0) != lrint(item->impl->y)) {
+				++n_moved;
+			}
+		}
+
+		// Reset forces for next time
+		node->impl->force.x   = 0.0;
+		node->impl->force.y   = 0.0;
+		node->impl->connected = FALSE;
+	}
+
+	if (update) {
+		// Now update edge positions to reflect new node positions
+		FOREACH_EDGE(_edges, i) {
+			GanvEdge* const edge = *i;
+			ganv_edge_update_location(edge);
+		}
+	}
+
+	layout_energy *= 0.999;
+	return n_moved > 0;
+}
+
+#endif // GANV_FDGL
+
+void
+GanvCanvasImpl::select_port(GanvPort* p, bool unique)
+{
+	if (unique) {
+		unselect_ports();
+	}
+	g_object_set(G_OBJECT(p), "selected", TRUE, NULL);
+	_selected_ports.insert(p);
+	_last_selected_port = p;
+}
+
+void
+GanvCanvasImpl::select_port_toggle(GanvPort* port, int mod_state)
+{
+	gboolean selected;
+	g_object_get(G_OBJECT(port), "selected", &selected, NULL);
+	if ((mod_state & GDK_CONTROL_MASK)) {
+		if (selected)
+			unselect_port(port);
+		else
+			select_port(port);
+	} else if ((mod_state & GDK_SHIFT_MASK)) {
+		GanvModule* const m = ganv_port_get_module(port);
+		if (_last_selected_port && m
+		    && ganv_port_get_module(_last_selected_port) == m) {
+			// Pivot around _last_selected_port in a single pass over module ports each click
+			GanvPort* old_last_selected = _last_selected_port;
+			GanvPort* first             = NULL;
+			bool      done              = false;
+			for (size_t i = 0; i < ganv_module_num_ports(m); ++i) {
+				GanvPort* const p = ganv_module_get_port(m, i);
+				if (!first && !done && (p == _last_selected_port || p == port)) {
+					first = p;
+				}
+
+				if (first && !done && p->impl->is_input == first->impl->is_input) {
+					select_port(p, false);
+				} else {
+					unselect_port(p);
+				}
+
+				if (p != first && (p == old_last_selected || p == port)) {
+					done = true;
+				}
+			}
+			_last_selected_port = old_last_selected;
+		} else {
+			if (selected) {
+				unselect_port(port);
+			} else {
+				select_port(port);
+			}
+		}
+	} else {
+		if (selected) {
+			unselect_ports();
+		} else {
+			select_port(port, true);
+		}
+	}
+}
+
+void
+GanvCanvasImpl::unselect_port(GanvPort* p)
+{
+	_selected_ports.erase(p);
+	g_object_set(G_OBJECT(p), "selected", FALSE, NULL);
+	if (_last_selected_port == p) {
+		_last_selected_port = NULL;
+	}
+}
+
+void
+GanvCanvasImpl::selection_joined_with(GanvPort* port)
+{
+	FOREACH_SELECTED_PORT(i)
+		ports_joined(*i, port);
+}
+
+void
+GanvCanvasImpl::join_selection()
+{
+	std::vector<GanvPort*> inputs;
+	std::vector<GanvPort*> outputs;
+	FOREACH_SELECTED_PORT(i) {
+		if ((*i)->impl->is_input) {
+			inputs.push_back(*i);
+		} else {
+			outputs.push_back(*i);
+		}
+	}
+
+	if (inputs.size() == 1) { // 1 -> n
+		for (size_t i = 0; i < outputs.size(); ++i)
+			ports_joined(inputs[0], outputs[i]);
+	} else if (outputs.size() == 1) { // n -> 1
+		for (size_t i = 0; i < inputs.size(); ++i)
+			ports_joined(inputs[i], outputs[0]);
+	} else { // n -> m
+		size_t num_to_connect = std::min(inputs.size(), outputs.size());
+		for (size_t i = 0; i < num_to_connect; ++i) {
+			ports_joined(inputs[i], outputs[i]);
+		}
+	}
+}
+
+GanvNode*
+GanvCanvasImpl::get_node_at(double x, double y)
+{
+	GanvItem* item = ganv_canvas_get_item_at(GANV_CANVAS(_gcanvas), x, y);
+	while (item) {
+		if (GANV_IS_NODE(item)) {
+			return GANV_NODE(item);
+		} else {
+			item = item->impl->parent;
+		}
+	}
+
+	return NULL;
+}
+
+bool
+GanvCanvasImpl::on_event(GdkEvent* event)
+{
+	static const int scroll_increment = 10;
+	int scroll_x, scroll_y;
+
+	bool handled = false;
+	switch (event->type) {
+	case GDK_KEY_PRESS:
+		handled = true;
+		ganv_canvas_get_scroll_offsets(GANV_CANVAS(_gcanvas), &scroll_x, &scroll_y);
+		switch (event->key.keyval) {
+		case GDK_Up:
+			scroll_y -= scroll_increment;
+			break;
+		case GDK_Down:
+			scroll_y += scroll_increment;
+			break;
+		case GDK_Left:
+			scroll_x -= scroll_increment;
+			break;
+		case GDK_Right:
+			scroll_x += scroll_increment;
+			break;
+		case GDK_Return:
+			if (_selected_ports.size() > 1) {
+				join_selection();
+				ganv_canvas_clear_selection(_gcanvas);
+			}
+			break;
+		default:
+			handled = false;
+		}
+		if (handled) {
+			ganv_canvas_scroll_to(GANV_CANVAS(_gcanvas), scroll_x, scroll_y);
+			return true;
+		}
+		break;
+
+	case GDK_SCROLL:
+		if ((event->scroll.state & GDK_CONTROL_MASK)) {
+			const double zoom = ganv_canvas_get_zoom(_gcanvas);
+			if (event->scroll.direction == GDK_SCROLL_UP) {
+				ganv_canvas_set_zoom(_gcanvas, zoom * 1.25);
+				return true;
+			} else if (event->scroll.direction == GDK_SCROLL_DOWN) {
+				ganv_canvas_set_zoom(_gcanvas, zoom * 0.75);
+				return true;
+			}
+		}
+		break;
+
+	default:
+		break;
+	}
+
+	return scroll_drag_handler(event)
+		|| select_drag_handler(event)
+		|| connect_drag_handler(event);
+}
+
+bool
+GanvCanvasImpl::scroll_drag_handler(GdkEvent* event)
+{
+	bool handled = true;
+
+	static int    original_scroll_x = 0;
+	static int    original_scroll_y = 0;
+	static double origin_x          = 0;
+	static double origin_y          = 0;
+	static double scroll_offset_x   = 0;
+	static double scroll_offset_y   = 0;
+	static double last_x            = 0;
+	static double last_y            = 0;
+
+	GanvItem* root = ganv_canvas_root(_gcanvas);
+
+	if (event->type == GDK_BUTTON_PRESS && event->button.button == 2) {
+		ganv_canvas_grab_item(
+			root,
+			GDK_POINTER_MOTION_MASK|GDK_BUTTON_RELEASE_MASK,
+			NULL, event->button.time);
+		ganv_canvas_get_scroll_offsets(GANV_CANVAS(_gcanvas), &original_scroll_x, &original_scroll_y);
+		scroll_offset_x = 0;
+		scroll_offset_y = 0;
+		origin_x = event->button.x_root;
+		origin_y = event->button.y_root;
+		//cerr << "Origin: (" << origin_x << "," << origin_y << ")\n";
+		last_x = origin_x;
+		last_y = origin_y;
+		_drag_state = SCROLL;
+
+	} else if (event->type == GDK_MOTION_NOTIFY && _drag_state == SCROLL) {
+		const double x        = event->motion.x_root;
+		const double y        = event->motion.y_root;
+		const double x_offset = last_x - x;
+		const double y_offset = last_y - y;
+
+		//cerr << "Coord: (" << x << "," << y << ")\n";
+		//cerr << "Offset: (" << x_offset << "," << y_offset << ")\n";
+
+		scroll_offset_x += x_offset;
+		scroll_offset_y += y_offset;
+		ganv_canvas_scroll_to(GANV_CANVAS(_gcanvas),
+		                      lrint(original_scroll_x + scroll_offset_x),
+		                      lrint(original_scroll_y + scroll_offset_y));
+		last_x = x;
+		last_y = y;
+	} else if (event->type == GDK_BUTTON_RELEASE && _drag_state == SCROLL) {
+		ganv_canvas_ungrab_item(root, event->button.time);
+		_drag_state = NOT_DRAGGING;
+	} else {
+		handled = false;
+	}
+
+	return handled;
+}
+
+static void
+get_motion_coords(GdkEventMotion* motion, double* x, double* y)
+{
+	if (motion->is_hint) {
+		gint px;
+		gint py;
+		GdkModifierType state;
+		gdk_window_get_pointer(motion->window, &px, &py, &state);
+		*x = px;
+		*y = py;
+	} else {
+		*x = motion->x;
+		*y = motion->y;
+	}
+}
+
+bool
+GanvCanvasImpl::select_drag_handler(GdkEvent* event)
+{
+	GanvItem* root = ganv_canvas_root(_gcanvas);
+	if (event->type == GDK_BUTTON_PRESS && event->button.button == 1) {
+		assert(_select_rect == NULL);
+		_drag_state = SELECT;
+		if ( !(event->button.state & (GDK_CONTROL_MASK | GDK_SHIFT_MASK)) )
+			ganv_canvas_clear_selection(_gcanvas);
+		_select_rect = GANV_BOX(
+			ganv_item_new(
+				root,
+				ganv_box_get_type(),
+				"x1", event->button.x,
+				"y1", event->button.y,
+				"x2", event->button.x,
+				"y2", event->button.y,
+				"fill-color", SELECT_RECT_FILL_COLOUR,
+				"border-color", SELECT_RECT_BORDER_COLOUR,
+				NULL));
+		_select_start_x = event->button.x;
+		_select_start_y = event->button.y;
+		ganv_canvas_grab_item(
+			root, GDK_POINTER_MOTION_MASK|GDK_BUTTON_RELEASE_MASK,
+			NULL, event->button.time);
+		return true;
+	} else if (event->type == GDK_MOTION_NOTIFY && _drag_state == SELECT) {
+		assert(_select_rect);
+		double x, y;
+		get_motion_coords(&event->motion, &x, &y);
+		_select_rect->impl->coords.x1 = MIN(_select_start_x, x);
+		_select_rect->impl->coords.y1 = MIN(_select_start_y, y);
+		_select_rect->impl->coords.x2 = MAX(_select_start_x, x);
+		_select_rect->impl->coords.y2 = MAX(_select_start_y, y);
+		ganv_item_request_update(&_select_rect->node.item);
+		return true;
+	} else if (event->type == GDK_BUTTON_RELEASE && _drag_state == SELECT) {
+		// Normalize select rect
+		ganv_box_normalize(_select_rect);
+
+		// Select all modules within rect
+		FOREACH_ITEM(_items, i) {
+			GanvNode* node = *i;
+			if ((void*)node != (void*)_select_rect &&
+			    ganv_node_is_within(
+				    node,
+				    ganv_box_get_x1(_select_rect),
+				    ganv_box_get_y1(_select_rect),
+				    ganv_box_get_x2(_select_rect),
+				    ganv_box_get_y2(_select_rect))) {
+				gboolean selected;
+				g_object_get(G_OBJECT(node), "selected", &selected, NULL);
+				if (selected) {
+					ganv_canvas_unselect_node(_gcanvas, node);
+				} else {
+					ganv_canvas_select_node(_gcanvas, node);
+				}
+			}
+		}
+
+		// Select all edges with handles within rect
+		FOREACH_EDGE(_edges, i) {
+			if (ganv_edge_is_within(
+				    (*i),
+				    ganv_box_get_x1(_select_rect),
+				    ganv_box_get_y1(_select_rect),
+				    ganv_box_get_x2(_select_rect),
+				    ganv_box_get_y2(_select_rect))) {
+				ganv_canvas_select_edge(_gcanvas, *i);
+			}
+		}
+
+		ganv_canvas_ungrab_item(root, event->button.time);
+
+		gtk_object_destroy(GTK_OBJECT(_select_rect));
+		_select_rect = NULL;
+		_drag_state = NOT_DRAGGING;
+		return true;
+	}
+	return false;
+}
+
+bool
+GanvCanvasImpl::connect_drag_handler(GdkEvent* event)
+{
+	static bool snapped = false;
+
+	if (_drag_state != EDGE) {
+		return false;
+	}
+
+	if (event->type == GDK_MOTION_NOTIFY) {
+		double x, y;
+		get_motion_coords(&event->motion, &x, &y);
+
+		if (!_drag_edge) {
+			// Create drag edge
+			assert(!_drag_node);
+			assert(_connect_port);
+
+			_drag_node = GANV_NODE(
+				ganv_item_new(
+					GANV_ITEM(ganv_canvas_root(GANV_CANVAS(_gcanvas))),
+					ganv_node_get_type(),
+					"x", x,
+					"y", y,
+					NULL));
+
+			_drag_edge = ganv_edge_new(
+				_gcanvas,
+				GANV_NODE(_connect_port),
+				_drag_node,
+				"color", GANV_NODE(_connect_port)->impl->fill_color,
+				"curved", TRUE,
+				"ghost", TRUE,
+				NULL);
+		}
+
+		GanvNode* joinee = get_node_at(x, y);
+		if (joinee && ganv_node_can_head(joinee) && joinee != _drag_node) {
+			// Snap to item
+			snapped = true;
+			ganv_item_set(&_drag_edge->item, "head", joinee, NULL);
+		} else if (snapped) {
+			// Unsnap from item
+			snapped = false;
+			ganv_item_set(&_drag_edge->item, "head", _drag_node, NULL);
+		}
+
+		// Update drag edge for pointer position
+		ganv_node_move_to(_drag_node, x, y);
+		ganv_item_request_update(GANV_ITEM(_drag_node));
+		ganv_item_request_update(GANV_ITEM(_drag_edge));
+
+		return true;
+
+	} else if (event->type == GDK_BUTTON_RELEASE) {
+		ganv_canvas_ungrab_item(root, event->button.time);
+
+		double x = event->button.x;
+		double y = event->button.y;
+
+		GanvNode* joinee = get_node_at(x, y);
+
+		if (GANV_IS_PORT(joinee)) {
+			if (joinee == GANV_NODE(_connect_port)) {
+				// Drag ended on the same port it started on, port clicked
+				if (_selected_ports.empty()) {
+					// No selected ports, port clicked
+					select_port(_connect_port);
+				} else {
+					// Connect to selected ports
+					selection_joined_with(_connect_port);
+					_connect_port = NULL;
+				}
+			} else {  // drag ended on different port
+				ports_joined(_connect_port, GANV_PORT(joinee));
+				_connect_port = NULL;
+			}
+		}
+
+		end_connect_drag();
+		return true;
+	}
+
+	return false;
+}
+
+void
+GanvCanvasImpl::end_connect_drag()
+{
+	if (_connect_port) {
+		highlight_port(_connect_port, false);
+	}
+	gtk_object_destroy(GTK_OBJECT(_drag_edge));
+	gtk_object_destroy(GTK_OBJECT(_drag_node));
+	_drag_state   = NOT_DRAGGING;
+	_connect_port = NULL;
+	_drag_edge    = NULL;
+	_drag_node    = NULL;
+}
+
+bool
+GanvCanvasImpl::port_event(GdkEvent* event, GanvPort* port)
+{
+	static bool   port_pressed        = true;
+	static bool   port_dragging       = false;
+	static bool   control_dragging    = false;
+	static double control_start_x     = 0;
+	static double control_start_y     = 0;
+	static float  control_start_value = 0;
+
+	switch (event->type) {
+	case GDK_BUTTON_PRESS:
+		if (event->button.button == 1) {
+			GanvModule* const module = ganv_port_get_module(port);
+			double port_x = event->button.x;
+			double port_y = event->button.y;
+			ganv_item_w2i(GANV_ITEM(port), &port_x, &port_y);
+
+			if (_selected_ports.empty() && module && port->impl->control &&
+			    (port->impl->is_input ||
+			     (port->impl->is_controllable &&
+			      port_x < ganv_box_get_width(GANV_BOX(port)) / 2.0))) {
+				if (port->impl->control->is_toggle) {
+					if (port->impl->control->value >= 0.5) {
+						ganv_port_set_control_value_internal(port, 0.0);
+					} else {
+						ganv_port_set_control_value_internal(port, 1.0);
+					}
+				} else {
+					control_dragging    = port_pressed = true;
+					control_start_x     = event->button.x_root;
+					control_start_y     = event->button.y_root;
+					control_start_value = ganv_port_get_control_value(port);
+					ganv_canvas_grab_item(
+						GANV_ITEM(port),
+						GDK_POINTER_MOTION_MASK|GDK_BUTTON_RELEASE_MASK,
+						NULL, event->button.time);
+					GANV_NODE(port)->impl->grabbed = TRUE;
+
+				}
+			} else if (!port->impl->is_input) {
+				port_dragging = port_pressed = true;
+				ganv_canvas_grab_item(
+					GANV_ITEM(port),
+					GDK_BUTTON_RELEASE_MASK|GDK_POINTER_MOTION_MASK|
+					GDK_ENTER_NOTIFY_MASK|GDK_LEAVE_NOTIFY_MASK,
+					NULL, event->button.time);
+			} else {
+				port_pressed = true;
+				ganv_canvas_grab_item(GANV_ITEM(port),
+				                      GDK_BUTTON_RELEASE_MASK,
+				                      NULL, event->button.time);
+			}
+			return true;
+		}
+		break;
+
+	case GDK_MOTION_NOTIFY:
+		if (control_dragging) {
+			const double mouse_x       = event->button.x_root;
+			const double mouse_y       = event->button.y_root;
+			GdkScreen*   screen        = gdk_screen_get_default();
+			const int    screen_width  = gdk_screen_get_width(screen);
+			const int    screen_height = gdk_screen_get_height(screen);
+			const double drag_dx       = mouse_x - control_start_x;
+			const double drag_dy       = mouse_y - control_start_y;
+			const double ythresh       = 0.2;  // Minimum y fraction for fine
+
+			const double range_x = ((drag_dx > 0)
+			                        ? (screen_width - control_start_x)
+			                        : control_start_x) - GANV_CANVAS_PAD;
+
+			const double range_y = ((drag_dy > 0)
+			                        ? (screen_height - control_start_y)
+			                        : control_start_y);
+
+			const double dx = drag_dx / range_x;
+			const double dy = fabs(drag_dy / range_y);
+
+			const double value_range = (drag_dx > 0)
+				? port->impl->control->max - control_start_value
+				: control_start_value - port->impl->control->min;
+
+			const double sens = (dy < ythresh)
+				? 1.0
+				: 1.0 - fabs(drag_dy / (range_y + ythresh));
+
+			const double dvalue = (dx * value_range) * sens;
+			double       value  = control_start_value + dvalue;
+			if (value < port->impl->control->min) {
+				value = port->impl->control->min;
+			} else if (value > port->impl->control->max) {
+				value = port->impl->control->max;
+			}
+			ganv_port_set_control_value_internal(port, value);
+			return true;
+		} else if (port_dragging) {
+			return true;
+		}
+		break;
+
+	case GDK_BUTTON_RELEASE:
+		if (port_pressed) {
+			ganv_canvas_ungrab_item(GANV_ITEM(port), event->button.time);
+		}
+
+		if (port_dragging) {
+			if (_connect_port) { // dragging
+				ports_joined(port, _connect_port);
+			} else {
+				port_clicked(event, port);
+			}
+			port_dragging = false;
+		} else if (control_dragging) {
+			control_dragging = false;
+			GANV_NODE(port)->impl->grabbed = FALSE;
+			if (event->button.x_root == control_start_x &&
+			    event->button.y_root == control_start_y) {
+				select_port_toggle(port, event->button.state);
+			}
+		} else {
+			port_clicked(event, port);
+		}
+		return true;
+
+	case GDK_ENTER_NOTIFY:
+		gboolean selected;
+		g_object_get(G_OBJECT(port), "selected", &selected, NULL);
+		if (!control_dragging && !selected) {
+			highlight_port(port, true);
+			return true;
+		}
+		break;
+
+	case GDK_LEAVE_NOTIFY:
+		if (port_dragging) {
+			_drag_state = GanvCanvasImpl::EDGE;
+			_connect_port = port;
+			port_dragging = false;
+			ganv_canvas_ungrab_item(GANV_ITEM(port), event->crossing.time);
+			ganv_canvas_grab_item(
+				root,
+				GDK_BUTTON_PRESS_MASK|GDK_POINTER_MOTION_MASK|GDK_BUTTON_RELEASE_MASK,
+				NULL, event->crossing.time);
+			return true;
+		} else if (!control_dragging) {
+			highlight_port(port, false);
+			return true;
+		}
+		break;
+
+	default:
+		break;
+	}
+
+	return false;
+}
+
+/* Called when two ports are 'joined' (connected or disconnected) */
+void
+GanvCanvasImpl::ports_joined(GanvPort* port1, GanvPort* port2)
+{
+	if (port1 == port2 || !port1 || !port2 || !port1->impl || !port2->impl) {
+		return;
+	}
+
+	highlight_port(port1, false);
+	highlight_port(port2, false);
+
+	GanvNode* src_node;
+	GanvNode* dst_node;
+
+	if (port2->impl->is_input && !port1->impl->is_input) {
+		src_node = GANV_NODE(port1);
+		dst_node = GANV_NODE(port2);
+	} else if (!port2->impl->is_input && port1->impl->is_input) {
+		src_node = GANV_NODE(port2);
+		dst_node = GANV_NODE(port1);
+	} else {
+		return;
+	}
+
+	if (!ganv_canvas_get_edge(_gcanvas, src_node, dst_node)) {
+		g_signal_emit(_gcanvas, signal_connect, 0,
+		              src_node, dst_node, NULL);
+	} else {
+		g_signal_emit(_gcanvas, signal_disconnect, 0,
+		              src_node, dst_node, NULL);
+	}
+}
+
+void
+GanvCanvasImpl::port_clicked(GdkEvent* event, GanvPort* port)
+{
+	const bool modded = event->button.state & (GDK_SHIFT_MASK|GDK_CONTROL_MASK);
+	if (!modded && _last_selected_port &&
+	    _last_selected_port->impl->is_input != port->impl->is_input) {
+		selection_joined_with(port);
+	} else {
+		select_port_toggle(port, event->button.state);
+	}
+}
+
+void
+GanvCanvasImpl::highlight_port(GanvPort* port, bool highlight)
+{
+	g_object_set(G_OBJECT(port), "highlighted", highlight, NULL);
+	ganv_canvas_for_each_edge_on(_gcanvas,
+	                             GANV_NODE(port),
+	                             (highlight
+	                              ? (GanvEdgeFunc)ganv_edge_highlight
+	                              : (GanvEdgeFunc)ganv_edge_unhighlight),
+	                             NULL);
+}
+
+/* Update animated "rubber band" selection effect. */
+gboolean
+GanvCanvasImpl::on_animate_timeout(gpointer data)
+{
+	GanvCanvasImpl* impl = (GanvCanvasImpl*)data;
+	if (!impl->pixmap_gc) {
+		return FALSE;  // Unrealized
+	}
+
+	const double seconds = get_monotonic_time() / 1000000.0;
+
+	FOREACH_ITEM(impl->_selected_items, s) {
+		ganv_node_tick(*s, seconds);
+	}
+
+	for (SelectedPorts::iterator p = impl->_selected_ports.begin();
+	     p != impl->_selected_ports.end();
+	     ++p) {
+		ganv_node_tick(GANV_NODE(*p), seconds);
+	}
+
+	FOREACH_EDGE(impl->_selected_edges, c) {
+		ganv_edge_tick(*c, seconds);
+	}
+
+	return TRUE;
+}
+
+void
+GanvCanvasImpl::move_contents_to_internal(double x, double y, double min_x, double min_y)
+{
+	FOREACH_ITEM(_items, i) {
+		ganv_node_move(*i,
+		               x - min_x,
+		               y - min_y);
+	}
+}
+
+void
+GanvCanvasImpl::unselect_ports()
+{
+	for (GanvCanvasImpl::SelectedPorts::iterator i = _selected_ports.begin();
+	     i != _selected_ports.end(); ++i)
+		g_object_set(G_OBJECT(*i), "selected", FALSE, NULL);
+
+	_selected_ports.clear();
+	_last_selected_port = NULL;
+}
+
+namespace Ganv {
+
+static gboolean
+on_event_after(GanvItem* canvasitem,
+               GdkEvent* ev,
+               void*     canvas)
+{
+	return ((Canvas*)canvas)->signal_event.emit(ev);
+}
+
+static void
+on_connect(GanvCanvas* canvas, GanvNode* tail, GanvNode* head, void* data)
+{
+	Canvas* canvasmm = (Canvas*)data;
+	canvasmm->signal_connect.emit(Glib::wrap(tail), Glib::wrap(head));
+}
+
+static void
+on_disconnect(GanvCanvas* canvas, GanvNode* tail, GanvNode* head, void* data)
+{
+	Canvas* canvasmm = (Canvas*)data;
+	canvasmm->signal_disconnect.emit(Glib::wrap(tail), Glib::wrap(head));
+}
+
+Canvas::Canvas(double width, double height)
+	: _gobj(GANV_CANVAS(ganv_canvas_new(width, height)))
+{
+	ganv_canvas_set_wrapper(_gobj, this);
+
+	g_signal_connect_after(ganv_canvas_root(_gobj), "event",
+	                       G_CALLBACK(on_event_after), this);
+	g_signal_connect(gobj(), "connect",
+	                 G_CALLBACK(on_connect), this);
+	g_signal_connect(gobj(), "disconnect",
+	                 G_CALLBACK(on_disconnect), this);
+}
+
+Canvas::~Canvas()
+{
+	delete _gobj->impl;
+}
+
+void
+Canvas::remove_edge_between(Node* item1, Node* item2)
+{
+	GanvEdge* edge = ganv_canvas_get_edge(_gobj, item1->gobj(), item2->gobj());
+	if (edge) {
+		ganv_canvas_remove_edge(_gobj, edge);
+	}
+}
+
+void
+Canvas::remove_edge(Edge* edge)
+{
+	ganv_canvas_remove_edge(_gobj, edge->gobj());
+}
+
+Item*
+Canvas::get_item_at(double x, double y) const
+{
+	GanvItem* item = ganv_canvas_get_item_at(_gobj, x, y);
+	if (item) {
+		return Glib::wrap(item);
+	}
+	return NULL;
+}
+
+Edge*
+Canvas::get_edge(Node* tail, Node* head) const
+{
+	GanvEdge* e = ganv_canvas_get_edge(_gobj, tail->gobj(), head->gobj());
+	if (e) {
+		return Glib::wrap(e);
+	}
+	return NULL;
+}
+
+} // namespace Ganv
+
+extern "C" {
+
+#include "ganv/canvas.h"
+
+#include "./boilerplate.h"
+#include "./color.h"
+#include "./gettext.h"
+
+G_DEFINE_TYPE_WITH_CODE(GanvCanvas, ganv_canvas, GTK_TYPE_LAYOUT,
+                        G_ADD_PRIVATE(GanvCanvas))
+
+enum {
+	PROP_0,
+	PROP_WIDTH,
+	PROP_HEIGHT,
+	PROP_DIRECTION,
+	PROP_FONT_SIZE,
+	PROP_LOCKED,
+	PROP_FOCUSED_ITEM
+};
+
+static gboolean
+on_canvas_event(GanvItem* canvasitem,
+                GdkEvent* ev,
+                void*     impl)
+{
+	return ((GanvCanvasImpl*)impl)->on_event(ev);
+}
+
+static void
+ganv_canvas_init(GanvCanvas* canvas)
+{
+	GTK_WIDGET_SET_FLAGS(canvas, GTK_CAN_FOCUS);
+
+	canvas->impl = new GanvCanvasImpl(canvas);
+
+	g_signal_connect(G_OBJECT(ganv_canvas_root(canvas)),
+	                 "event", G_CALLBACK(on_canvas_event), canvas->impl);
+}
+
+static void
+ganv_canvas_set_property(GObject*      object,
+                         guint         prop_id,
+                         const GValue* value,
+                         GParamSpec*   pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_CANVAS(object));
+
+	GanvCanvas* canvas = GANV_CANVAS(object);
+
+	switch (prop_id) {
+	case PROP_WIDTH:
+		ganv_canvas_resize(canvas, g_value_get_double(value), canvas->impl->height);
+		break;
+	case PROP_HEIGHT:
+		ganv_canvas_resize(canvas, canvas->impl->width, g_value_get_double(value));
+		break;
+	case PROP_DIRECTION:
+		ganv_canvas_set_direction(canvas, (GanvDirection)g_value_get_enum(value));
+		break;
+	case PROP_FONT_SIZE:
+		ganv_canvas_set_font_size(canvas, g_value_get_double(value));
+		break;
+	case PROP_LOCKED:
+		canvas->impl->locked = g_value_get_boolean(value);
+		break;
+	case PROP_FOCUSED_ITEM:
+		canvas->impl->focused_item = GANV_ITEM(g_value_get_object(value));
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_canvas_get_property(GObject*    object,
+                         guint       prop_id,
+                         GValue*     value,
+                         GParamSpec* pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_CANVAS(object));
+
+	GanvCanvas* canvas = GANV_CANVAS(object);
+
+	switch (prop_id) {
+		GET_CASE(WIDTH, double, canvas->impl->width)
+			GET_CASE(HEIGHT, double, canvas->impl->height)
+			GET_CASE(LOCKED, boolean, canvas->impl->locked);
+	case PROP_FOCUSED_ITEM:
+		g_value_set_object(value, GANV_CANVAS(object)->impl->focused_item);
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_canvas_class_init(GanvCanvasClass* klass)
+{
+	GObjectClass*   gobject_class = (GObjectClass*)klass;
+	GtkObjectClass* object_class  = (GtkObjectClass*)klass;
+	GtkWidgetClass* widget_class  = (GtkWidgetClass*)klass;
+
+	canvas_parent_class = GTK_LAYOUT_CLASS(g_type_class_peek_parent(klass));
+
+	gobject_class->set_property = ganv_canvas_set_property;
+	gobject_class->get_property = ganv_canvas_get_property;
+
+	object_class->destroy = ganv_canvas_destroy;
+
+	widget_class->map                  = ganv_canvas_map;
+	widget_class->unmap                = ganv_canvas_unmap;
+	widget_class->realize              = ganv_canvas_realize;
+	widget_class->unrealize            = ganv_canvas_unrealize;
+	widget_class->size_allocate        = ganv_canvas_size_allocate;
+	widget_class->button_press_event   = ganv_canvas_button;
+	widget_class->button_release_event = ganv_canvas_button;
+	widget_class->motion_notify_event  = ganv_canvas_motion;
+	widget_class->expose_event         = ganv_canvas_expose;
+	widget_class->key_press_event      = ganv_canvas_key;
+	widget_class->key_release_event    = ganv_canvas_key;
+	widget_class->enter_notify_event   = ganv_canvas_crossing;
+	widget_class->leave_notify_event   = ganv_canvas_crossing;
+	widget_class->focus_in_event       = ganv_canvas_focus_in;
+	widget_class->focus_out_event      = ganv_canvas_focus_out;
+	widget_class->scroll_event         = ganv_canvas_scroll;
+
+	g_object_class_install_property(
+		gobject_class, PROP_FOCUSED_ITEM, g_param_spec_object(
+			"focused-item",
+			_("Focused item"),
+			_("The item that currently has keyboard focus."),
+			GANV_TYPE_ITEM,
+			(GParamFlags)(G_PARAM_READABLE | G_PARAM_WRITABLE)));
+
+	g_object_class_install_property(
+		gobject_class, PROP_WIDTH, g_param_spec_double(
+			"width",
+			_("Width"),
+			_("The width of the canvas."),
+			0.0, G_MAXDOUBLE,
+			800.0,
+			(GParamFlags)G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_HEIGHT, g_param_spec_double(
+			"height",
+			_("Height"),
+			_("The height of the canvas"),
+			0.0, G_MAXDOUBLE,
+			600.0,
+			(GParamFlags)G_PARAM_READWRITE));
+
+	GEnumValue down_dir  = { GANV_DIRECTION_DOWN, "down", "down" };
+	GEnumValue right_dir = { GANV_DIRECTION_RIGHT, "right", "right" };
+	GEnumValue null_dir  = { 0, 0, 0 };
+	dir_values[0] = down_dir;
+	dir_values[1] = right_dir;
+	dir_values[2] = null_dir;
+	GType dir_type = g_enum_register_static("GanvDirection",
+	                                        dir_values);
+
+	g_object_class_install_property(
+		gobject_class, PROP_DIRECTION, g_param_spec_enum(
+			"direction",
+			_("Direction"),
+			_("The direction of the signal flow on the canvas."),
+			dir_type,
+			GANV_DIRECTION_RIGHT,
+			(GParamFlags)G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_FONT_SIZE, g_param_spec_double(
+			"font-size",
+			_("Font size"),
+			_("The default font size for the canvas"),
+			0.0, G_MAXDOUBLE,
+			12.0,
+			(GParamFlags)G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_LOCKED, g_param_spec_boolean(
+			"locked",
+			_("Locked"),
+			_("If true, nodes on the canvas can not be moved by the user."),
+			FALSE,
+			(GParamFlags)G_PARAM_READWRITE));
+
+	signal_connect = g_signal_new("connect",
+	                              ganv_canvas_get_type(),
+	                              G_SIGNAL_RUN_FIRST,
+	                              0, NULL, NULL,
+	                              ganv_marshal_VOID__OBJECT_OBJECT,
+	                              G_TYPE_NONE,
+	                              2,
+	                              ganv_node_get_type(),
+	                              ganv_node_get_type(),
+	                              0);
+
+	signal_disconnect = g_signal_new("disconnect",
+	                                 ganv_canvas_get_type(),
+	                                 G_SIGNAL_RUN_FIRST,
+	                                 0, NULL, NULL,
+	                                 ganv_marshal_VOID__OBJECT_OBJECT,
+	                                 G_TYPE_NONE,
+	                                 2,
+	                                 ganv_node_get_type(),
+	                                 ganv_node_get_type(),
+	                                 0);
+}
+
+void
+ganv_canvas_resize(GanvCanvas* canvas, double width, double height)
+{
+	if (width != canvas->impl->width || height != canvas->impl->height) {
+		canvas->impl->width  = width;
+		canvas->impl->height = height;
+		ganv_canvas_set_scroll_region(canvas, 0.0, 0.0, width, height);
+	}
+}
+
+void
+ganv_canvas_contents_changed(GanvCanvas* canvas)
+{
+#ifdef GANV_FDGL
+	if (!canvas->impl->layout_idle_id && canvas->impl->sprung_layout) {
+		canvas->impl->layout_energy = 0.4;
+		canvas->impl->layout_idle_id = g_timeout_add_full(
+			G_PRIORITY_DEFAULT_IDLE,
+			33,
+			GanvCanvasImpl::on_layout_timeout,
+			canvas->impl,
+			GanvCanvasImpl::on_layout_done);
+	}
+#endif
+}
+
+double
+ganv_canvas_get_default_font_size(const GanvCanvas* canvas)
+{
+	GtkStyle*                   style = gtk_rc_get_style(GTK_WIDGET(canvas));
+	const PangoFontDescription* font  = style->font_desc;
+	return pango_font_description_get_size(font) / (double)PANGO_SCALE;
+}
+
+double
+ganv_canvas_get_font_size(const GanvCanvas* canvas)
+{
+	return canvas->impl->font_size;
+}
+
+void
+ganv_canvas_set_zoom(GanvCanvas* canvas, double zoom)
+{
+	g_return_if_fail(GANV_IS_CANVAS(canvas));
+
+	zoom = std::max(zoom, 0.01);
+	if (zoom == canvas->impl->pixels_per_unit) {
+		return;
+	}
+
+	const int anchor_x = (canvas->impl->center_scroll_region)
+		? GTK_WIDGET(canvas)->allocation.width / 2
+		: 0;
+	const int anchor_y = (canvas->impl->center_scroll_region)
+		? GTK_WIDGET(canvas)->allocation.height / 2
+		: 0;
+
+	/* Find the coordinates of the anchor point in units. */
+	const double ax = (canvas->layout.hadjustment)
+		? ((canvas->layout.hadjustment->value + anchor_x)
+		   / canvas->impl->pixels_per_unit
+		   + canvas->impl->scroll_x1 + canvas->impl->zoom_xofs)
+		: ((0.0 + anchor_x) / canvas->impl->pixels_per_unit
+		   + canvas->impl->scroll_x1 + canvas->impl->zoom_xofs);
+	const double ay = (canvas->layout.hadjustment)
+		? ((canvas->layout.vadjustment->value + anchor_y)
+		   / canvas->impl->pixels_per_unit
+		   + canvas->impl->scroll_y1 + canvas->impl->zoom_yofs)
+		: ((0.0 + anchor_y) / canvas->impl->pixels_per_unit
+		   + canvas->impl->scroll_y1 + canvas->impl->zoom_yofs);
+
+	/* Now calculate the new offset of the upper left corner. */
+	const int x1 = ((ax - canvas->impl->scroll_x1) * zoom) - anchor_x;
+	const int y1 = ((ay - canvas->impl->scroll_y1) * zoom) - anchor_y;
+
+	canvas->impl->pixels_per_unit = zoom;
+	ganv_canvas_scroll_to(canvas, x1, y1);
+
+	ganv_canvas_request_update(canvas);
+	gtk_widget_queue_draw(GTK_WIDGET(canvas));
+
+	canvas->impl->need_repick = TRUE;
+}
+
+void
+ganv_canvas_set_font_size(GanvCanvas* canvas, double points)
+{
+	points = std::max(points, 1.0);
+	if (points != canvas->impl->font_size) {
+		canvas->impl->font_size = points;
+		FOREACH_ITEM(canvas->impl->_items, i) {
+			ganv_node_redraw_text(*i);
+		}
+	}
+}
+
+void
+ganv_canvas_zoom_full(GanvCanvas* canvas)
+{
+	if (canvas->impl->_items.empty())
+		return;
+
+	int win_width, win_height;
+	GdkWindow* win = gtk_widget_get_window(
+		GTK_WIDGET(canvas->impl->_gcanvas));
+	gdk_window_get_size(win, &win_width, &win_height);
+
+	// Box containing all canvas items
+	double left   = DBL_MAX;
+	double right  = DBL_MIN;
+	double top    = DBL_MIN;
+	double bottom = DBL_MAX;
+
+	FOREACH_ITEM(canvas->impl->_items, i) {
+		GanvItem* const item = GANV_ITEM(*i);
+		const double    x    = item->impl->x;
+		const double    y    = item->impl->y;
+		if (GANV_IS_CIRCLE(*i)) {
+			const double r = GANV_CIRCLE(*i)->impl->coords.radius;
+			left   = MIN(left, x - r);
+			right  = MAX(right, x + r);
+			bottom = MIN(bottom, y - r);
+			top    = MAX(top, y + r);
+		} else {
+			left   = MIN(left, x);
+			right  = MAX(right, x + ganv_box_get_width(GANV_BOX(*i)));
+			bottom = MIN(bottom, y);
+			top    = MAX(top, y + ganv_box_get_height(GANV_BOX(*i)));
+		}
+	}
+
+	static const double pad = GANV_CANVAS_PAD;
+
+	const double new_zoom = std::min(
+		((double)win_width / (double)(right - left + pad*2.0)),
+		((double)win_height / (double)(top - bottom + pad*2.0)));
+
+	ganv_canvas_set_zoom(canvas, new_zoom);
+
+	int scroll_x, scroll_y;
+	ganv_canvas_w2c(canvas->impl->_gcanvas,
+	                lrintf(left - pad), lrintf(bottom - pad),
+	                &scroll_x, &scroll_y);
+
+	ganv_canvas_scroll_to(canvas->impl->_gcanvas,
+	                      scroll_x, scroll_y);
+}
+
+static void
+set_node_direction(GanvNode* node, void* data)
+{
+	if (GANV_IS_MODULE(node)) {
+		ganv_module_set_direction(GANV_MODULE(node), *(GanvDirection*)data);
+	}
+}
+
+GanvDirection
+ganv_canvas_get_direction(GanvCanvas* canvas)
+{
+	return canvas->impl->direction;
+}
+
+void
+ganv_canvas_set_direction(GanvCanvas* canvas, GanvDirection dir)
+{
+	if (canvas->impl->direction != dir) {
+		canvas->impl->direction = dir;
+		ganv_canvas_for_each_node(canvas, set_node_direction, &dir);
+		ganv_canvas_contents_changed(canvas);
+	}
+}
+
+void
+ganv_canvas_clear_selection(GanvCanvas* canvas)
+{
+	canvas->impl->unselect_ports();
+
+	Items items(canvas->impl->_selected_items);
+	canvas->impl->_selected_items.clear();
+	FOREACH_ITEM(items, i) {
+		ganv_item_set(GANV_ITEM(*i), "selected", FALSE, NULL);
+	}
+
+	GanvCanvasImpl::SelectedEdges edges(canvas->impl->_selected_edges);
+	canvas->impl->_selected_edges.clear();
+	FOREACH_SELECTED_EDGE(edges, c) {
+		ganv_item_set(GANV_ITEM(*c), "selected", FALSE, NULL);
+	}
+}
+
+void
+ganv_canvas_move_selected_items(GanvCanvas* canvas,
+                                double      dx,
+                                double      dy)
+{
+	FOREACH_ITEM(canvas->impl->_selected_items, i) {
+		if ((*i)->item.impl->parent == canvas->impl->root) {
+			ganv_node_move(*i, dx, dy);
+		}
+	}
+}
+
+void
+ganv_canvas_selection_move_finished(GanvCanvas* canvas)
+{
+	FOREACH_ITEM(canvas->impl->_selected_items, i) {
+		const double x = GANV_ITEM(*i)->impl->x;
+		const double y = GANV_ITEM(*i)->impl->y;
+		g_signal_emit(*i, signal_moved, 0, x, y, NULL);
+	}
+}
+
+static void
+select_if_ends_are_selected(GanvEdge* edge, void* data)
+{
+	if (ganv_node_is_selected(ganv_edge_get_tail(edge)) &&
+	    ganv_node_is_selected(ganv_edge_get_head(edge))) {
+		ganv_edge_set_selected(edge, TRUE);
+	}
+}
+
+static void
+unselect_edges(GanvPort* port, void* data)
+{
+	GanvCanvasImpl* impl = (GanvCanvasImpl*)data;
+	if (port->impl->is_input) {
+		ganv_canvas_for_each_edge_to(impl->_gcanvas,
+		                             GANV_NODE(port),
+		                             (GanvEdgeFunc)ganv_edge_unselect,
+		                             NULL);
+	} else {
+		ganv_canvas_for_each_edge_from(impl->_gcanvas,
+		                               GANV_NODE(port),
+		                               (GanvEdgeFunc)ganv_edge_unselect,
+		                               NULL);
+	}
+}
+
+void
+ganv_canvas_select_node(GanvCanvas* canvas,
+                        GanvNode*   node)
+{
+	canvas->impl->_selected_items.insert(node);
+
+	// Select any connections to or from this node
+	if (GANV_IS_MODULE(node)) {
+		ganv_module_for_each_port(GANV_MODULE(node), select_edges, canvas->impl);
+	} else {
+		ganv_canvas_for_each_edge_on(
+			canvas, node, select_if_ends_are_selected, canvas->impl);
+	}
+
+	g_object_set(node, "selected", TRUE, NULL);
+}
+
+void
+ganv_canvas_unselect_node(GanvCanvas* canvas,
+                          GanvNode*   node)
+{
+	// Unselect any connections to or from canvas->impl node
+	if (GANV_IS_MODULE(node)) {
+		ganv_module_for_each_port(GANV_MODULE(node), unselect_edges, canvas->impl);
+	} else {
+		ganv_canvas_for_each_edge_on(
+			canvas, node, (GanvEdgeFunc)ganv_edge_unselect, NULL);
+	}
+
+	// Unselect item
+	canvas->impl->_selected_items.erase(node);
+	g_object_set(node, "selected", FALSE, NULL);
+}
+
+void
+ganv_canvas_add_node(GanvCanvas* canvas,
+                     GanvNode*   node)
+{
+	GanvItem* item = GANV_ITEM(node);
+	if (item->impl->parent == ganv_canvas_root(canvas)) {
+		canvas->impl->_items.insert(node);
+	}
+}
+
+void
+ganv_canvas_remove_node(GanvCanvas* canvas,
+                        GanvNode*   node)
+{
+	if (node == (GanvNode*)canvas->impl->_connect_port) {
+		if (canvas->impl->_drag_state == GanvCanvasImpl::EDGE) {
+			ganv_canvas_ungrab_item(ganv_canvas_root(canvas), 0);
+			canvas->impl->end_connect_drag();
+		}
+		canvas->impl->_connect_port = NULL;
+	}
+
+	// Remove from selection
+	canvas->impl->_selected_items.erase(node);
+
+	// Remove children ports from selection if item is a module
+	if (GANV_IS_MODULE(node)) {
+		GanvModule* const module = GANV_MODULE(node);
+		for (unsigned i = 0; i < ganv_module_num_ports(module); ++i) {
+			canvas->impl->unselect_port(ganv_module_get_port(module, i));
+		}
+	}
+
+	// Remove from items
+	canvas->impl->_items.erase(node);
+}
+
+GanvEdge*
+ganv_canvas_get_edge(GanvCanvas* canvas,
+                     GanvNode*   tail,
+                     GanvNode*   head)
+{
+	GanvEdgeKey key;
+	make_edge_search_key(&key, tail, head);
+	GanvCanvasImpl::Edges::const_iterator i = canvas->impl->_edges.find((GanvEdge*)&key);
+	return (i != canvas->impl->_edges.end()) ? *i : NULL;
+}
+
+void
+ganv_canvas_remove_edge_between(GanvCanvas* canvas,
+                                GanvNode*   tail,
+                                GanvNode*   head)
+{
+	ganv_canvas_remove_edge(canvas, ganv_canvas_get_edge(canvas, tail, head));
+}
+
+void
+ganv_canvas_disconnect_edge(GanvCanvas* canvas,
+                            GanvEdge*   edge)
+{
+	g_signal_emit(canvas, signal_disconnect, 0,
+	              edge->impl->tail, edge->impl->head, NULL);
+}
+
+void
+ganv_canvas_add_edge(GanvCanvas* canvas,
+                     GanvEdge*   edge)
+{
+	canvas->impl->_edges.insert(edge);
+	canvas->impl->_dst_edges.insert(edge);
+	ganv_canvas_contents_changed(canvas);
+}
+
+void
+ganv_canvas_remove_edge(GanvCanvas* canvas,
+                        GanvEdge*   edge)
+{
+	if (edge) {
+		canvas->impl->_selected_edges.erase(edge);
+		canvas->impl->_edges.erase(edge);
+		canvas->impl->_dst_edges.erase(edge);
+		ganv_edge_request_redraw(GANV_ITEM(edge), &edge->impl->coords);
+		gtk_object_destroy(GTK_OBJECT(edge));
+		ganv_canvas_contents_changed(canvas);
+	}
+}
+
+void
+ganv_canvas_select_edge(GanvCanvas* canvas,
+                        GanvEdge*   edge)
+{
+	ganv_item_set(GANV_ITEM(edge), "selected", TRUE, NULL);
+	canvas->impl->_selected_edges.insert(edge);
+}
+
+void
+ganv_canvas_unselect_edge(GanvCanvas* canvas,
+                          GanvEdge*   edge)
+{
+	ganv_item_set(GANV_ITEM(edge), "selected", FALSE, NULL);
+	canvas->impl->_selected_edges.erase(edge);
+}
+
+void
+ganv_canvas_for_each_node(GanvCanvas*  canvas,
+                          GanvNodeFunc f,
+                          void*        data)
+{
+	FOREACH_ITEM(canvas->impl->_items, i) {
+		f(*i, data);
+	}
+}
+
+void
+ganv_canvas_for_each_selected_node(GanvCanvas*  canvas,
+                                   GanvNodeFunc f,
+                                   void*        data)
+{
+	FOREACH_ITEM(canvas->impl->_selected_items, i) {
+		f(*i, data);
+	}
+}
+
+gboolean
+ganv_canvas_empty(const GanvCanvas* canvas)
+{
+	return canvas->impl->_items.empty();
+}
+
+void
+ganv_canvas_for_each_edge(GanvCanvas*  canvas,
+                          GanvEdgeFunc f,
+                          void*        data)
+{
+	GanvCanvasImpl* impl = canvas->impl;
+	for (GanvCanvasImpl::Edges::const_iterator i = impl->_edges.begin();
+	     i != impl->_edges.end();) {
+		GanvCanvasImpl::Edges::const_iterator next = i;
+		++next;
+		f((*i), data);
+		i = next;
+	}
+}
+
+void
+ganv_canvas_for_each_edge_from(GanvCanvas*     canvas,
+                               const GanvNode* tail,
+                               GanvEdgeFunc    f,
+                               void*           data)
+{
+	GanvCanvasImpl* impl = canvas->impl;
+	for (GanvCanvasImpl::Edges::const_iterator i = impl->first_edge_from(tail);
+	     i != impl->_edges.end() && (*i)->impl->tail == tail;) {
+		GanvCanvasImpl::Edges::const_iterator next = i;
+		++next;
+		f((*i), data);
+		i = next;
+	}
+}
+
+void
+ganv_canvas_for_each_edge_to(GanvCanvas*     canvas,
+                             const GanvNode* head,
+                             GanvEdgeFunc    f,
+                             void*           data)
+{
+	GanvCanvasImpl* impl = canvas->impl;
+	for (GanvCanvasImpl::Edges::const_iterator i = impl->first_edge_to(head);
+	     i != impl->_dst_edges.end() && (*i)->impl->head == head;) {
+		GanvCanvasImpl::Edges::const_iterator next = i;
+		++next;
+		f((*i), data);
+		i = next;
+	}
+}
+
+void
+ganv_canvas_for_each_edge_on(GanvCanvas*     canvas,
+                             const GanvNode* node,
+                             GanvEdgeFunc    f,
+                             void*           data)
+{
+	ganv_canvas_for_each_edge_from(canvas, node, f, data);
+	ganv_canvas_for_each_edge_to(canvas, node, f, data);
+}
+
+void
+ganv_canvas_for_each_selected_edge(GanvCanvas*  canvas,
+                                   GanvEdgeFunc f,
+                                   void*        data)
+{
+	FOREACH_EDGE(canvas->impl->_selected_edges, i) {
+		f((*i), data);
+	}
+}
+
+GdkCursor*
+ganv_canvas_get_move_cursor(const GanvCanvas* canvas)
+{
+	return canvas->impl->_move_cursor;
+}
+
+gboolean
+ganv_canvas_port_event(GanvCanvas* canvas,
+                       GanvPort*   port,
+                       GdkEvent*   event)
+{
+	return canvas->impl->port_event(event, port);
+}
+
+void
+ganv_canvas_clear(GanvCanvas* canvas)
+{
+	canvas->impl->_selected_items.clear();
+	canvas->impl->_selected_edges.clear();
+
+	Items items = canvas->impl->_items; // copy
+	FOREACH_ITEM(items, i) {
+		gtk_object_destroy(GTK_OBJECT(*i));
+	}
+	canvas->impl->_items.clear();
+
+	GanvCanvasImpl::Edges edges = canvas->impl->_edges; // copy
+	FOREACH_EDGE(edges, i) {
+		gtk_object_destroy(GTK_OBJECT(*i));
+	}
+	canvas->impl->_edges.clear();
+	canvas->impl->_dst_edges.clear();
+
+	canvas->impl->_selected_ports.clear();
+	canvas->impl->_connect_port = NULL;
+}
+
+void
+ganv_canvas_select_all(GanvCanvas* canvas)
+{
+	ganv_canvas_clear_selection(canvas);
+	FOREACH_ITEM(canvas->impl->_items, i) {
+		ganv_canvas_select_node(canvas, *i);
+	}
+}
+
+double
+ganv_canvas_get_zoom(const GanvCanvas* canvas)
+{
+	return canvas->impl->pixels_per_unit;
+}
+
+void
+ganv_canvas_move_contents_to(GanvCanvas* canvas, double x, double y)
+{
+	double min_x=HUGE_VAL, min_y=HUGE_VAL;
+	FOREACH_ITEM(canvas->impl->_items, i) {
+		const double x = GANV_ITEM(*i)->impl->x;
+		const double y = GANV_ITEM(*i)->impl->y;
+		min_x = std::min(min_x, x);
+		min_y = std::min(min_y, y);
+	}
+	canvas->impl->move_contents_to_internal(x, y, min_x, min_y);
+}
+
+void
+ganv_canvas_arrange(GanvCanvas* canvas)
+{
+#ifdef HAVE_AGRAPH
+	GVNodes nodes = canvas->impl->layout_dot((char*)"");
+
+	double least_x=HUGE_VAL, least_y=HUGE_VAL, most_x=0, most_y=0;
+
+	// Set numeric locale to POSIX for reading graphviz output with strtod
+	char* locale = strdup(setlocale(LC_NUMERIC, NULL));
+	setlocale(LC_NUMERIC, "POSIX");
+
+	const double dpi = gdk_screen_get_resolution(gdk_screen_get_default());
+	const double dpp = dpi / 72.0;
+
+	// Arrange to graphviz coordinates
+	for (GVNodes::iterator i = nodes.begin(); i != nodes.end(); ++i) {
+		if (GANV_ITEM(i->first)->impl->parent != GANV_ITEM(ganv_canvas_root(canvas))) {
+			continue;
+		}
+		const std::string pos   = agget(i->second, (char*)"pos");
+		const std::string x_str = pos.substr(0, pos.find(","));
+		const std::string y_str = pos.substr(pos.find(",") + 1);
+		const double      cx    = lrint(strtod(x_str.c_str(), NULL) * dpp);
+		const double      cy    = lrint(strtod(y_str.c_str(), NULL) * dpp);
+
+		double w, h;
+		if (GANV_IS_BOX(i->first)) {
+			w = ganv_box_get_width(GANV_BOX(i->first));
+			h = ganv_box_get_height(GANV_BOX(i->first));
+		} else {
+			w = h = ganv_circle_get_radius(GANV_CIRCLE(i->first)) * 2.3;
+		}
+
+		/* Dot node positions are supposedly node centers, but things only
+		   match up if x is interpreted as center and y as top...
+		*/
+		double x = cx - (w / 2.0);
+		double y = -cy - (h / 2.0);
+
+		ganv_node_move_to(i->first, x, y);
+
+		if (GANV_IS_CIRCLE(i->first)) {
+			// Offset least x and y to avoid cutting off circles at origin
+			const double r = ganv_circle_get_radius(GANV_CIRCLE(i->first));
+			x -= r;
+			y -= r;
+		}
+
+		least_x = std::min(least_x, x);
+		least_y = std::min(least_y, y);
+		most_x  = std::max(most_x, x + w);
+		most_y  = std::max(most_y, y + h);
+	}
+
+	// Reset numeric locale to original value
+	setlocale(LC_NUMERIC, locale);
+	free(locale);
+
+	const double graph_width  = most_x - least_x;
+	const double graph_height = most_y - least_y;
+
+	//cerr << "CWH: " << _width << ", " << _height << endl;
+	//cerr << "GWH: " << graph_width << ", " << graph_height << endl;
+
+	double old_width, old_height;
+	g_object_get(G_OBJECT(canvas),
+	             "width", &old_width,
+	             "height", &old_height,
+	             NULL);
+
+	const double new_width  = std::max(graph_width + 10.0, old_width);
+	const double new_height = std::max(graph_height + 10.0, old_height);
+	if (new_width != old_width || new_height != old_height) {
+		ganv_canvas_resize(canvas, new_width, new_height);
+	}
+	nodes.cleanup();
+
+	static const double border_width = GANV_CANVAS_PAD;
+	canvas->impl->move_contents_to_internal(border_width, border_width, least_x, least_y);
+	ganv_canvas_scroll_to(canvas->impl->_gcanvas, 0, 0);
+
+	FOREACH_ITEM(canvas->impl->_items, i) {
+		const double x = GANV_ITEM(*i)->impl->x;
+		const double y = GANV_ITEM(*i)->impl->y;
+		g_signal_emit(*i, signal_moved, 0, x, y, NULL);
+	}
+#endif
+}
+
+int
+ganv_canvas_export_image(GanvCanvas* canvas,
+                         const char* filename,
+                         gboolean    draw_background)
+{
+	const char* ext = strrchr(filename, '.');
+	if (!ext) {
+		return 1;
+	} else if (!strcmp(ext, ".dot")) {
+		ganv_canvas_export_dot(canvas, filename);
+		return 0;
+	}
+
+	cairo_surface_t* rec_surface = cairo_recording_surface_create(
+		CAIRO_CONTENT_COLOR_ALPHA, NULL);
+
+	// Draw to recording surface
+	cairo_t* cr = cairo_create(rec_surface);
+	canvas->impl->exporting = TRUE;
+	(*GANV_ITEM_GET_CLASS(canvas->impl->root)->draw)(
+		canvas->impl->root, cr,
+		0, 0, canvas->impl->width, canvas->impl->height);
+	canvas->impl->exporting = FALSE;
+	cairo_destroy(cr);
+
+	// Get draw extent
+	double x, y, w, h;
+	cairo_recording_surface_ink_extents(rec_surface, &x, &y, &w, &h);
+
+	// Create image surface with the appropriate size
+	const double     pad   = GANV_CANVAS_PAD;
+	const double     img_w = w + pad * 2;
+	const double     img_h = h + pad * 2;
+	cairo_surface_t* img   = NULL;
+	if (!strcmp(ext, ".svg")) {
+		img = cairo_svg_surface_create(filename, img_w, img_h);
+	} else if (!strcmp(ext, ".pdf")) {
+		img = cairo_pdf_surface_create(filename, img_w, img_h);
+	} else if (!strcmp(ext, ".ps")) {
+		img = cairo_ps_surface_create(filename, img_w, img_h);
+	} else {
+		cairo_surface_destroy(rec_surface);
+		return 1;
+	}
+
+	// Draw recording to image surface
+	cr = cairo_create(img);
+	if (draw_background) {
+		double r, g, b, a;
+		color_to_rgba(DEFAULT_BACKGROUND_COLOR, &r, &g, &b, &a);
+		cairo_set_source_rgba(cr, r, g, b, a);
+		cairo_rectangle(cr, 0, 0, w + 2 * pad, h + 2 * pad);
+		cairo_fill(cr);
+	}
+	cairo_set_source_surface(cr, rec_surface, -x + pad, -y + pad);
+	cairo_paint(cr);
+	cairo_destroy(cr);
+	cairo_surface_destroy(rec_surface);
+	cairo_surface_destroy(img);
+	return 0;
+}
+
+void
+ganv_canvas_export_dot(GanvCanvas* canvas, const char* filename)
+{
+#ifdef HAVE_AGRAPH
+	GVNodes nodes = canvas->impl->layout_dot(filename);
+	nodes.cleanup();
+#endif
+}
+
+gboolean
+ganv_canvas_supports_sprung_layout(const GanvCanvas* canvas)
+{
+#ifdef GANV_FDGL
+	return TRUE;
+#else
+	return FALSE;
+#endif
+}
+
+gboolean
+ganv_canvas_set_sprung_layout(GanvCanvas* canvas, gboolean sprung_layout)
+{
+#ifndef GANV_FDGL
+	return FALSE;
+#else
+	canvas->impl->sprung_layout = sprung_layout;
+	ganv_canvas_contents_changed(canvas);
+	return TRUE;
+#endif
+}
+
+gboolean
+ganv_canvas_get_locked(const GanvCanvas* canvas)
+{
+	return canvas->impl->locked;
+}
+
+/* Convenience function to remove the idle handler of a canvas */
+static void
+remove_idle(GanvCanvas* canvas)
+{
+	if (canvas->impl->idle_id == 0) {
+		return;
+	}
+
+	g_source_remove(canvas->impl->idle_id);
+	canvas->impl->idle_id = 0;
+}
+
+/* Removes the transient state of the canvas (idle handler, grabs). */
+static void
+shutdown_transients(GanvCanvas* canvas)
+{
+	/* We turn off the need_redraw flag, since if the canvas is mapped again
+	 * it will request a redraw anyways.  We do not turn off the need_update
+	 * flag, though, because updates are not queued when the canvas remaps
+	 * itself.
+	 */
+	if (canvas->impl->need_redraw) {
+		canvas->impl->need_redraw = FALSE;
+		g_slist_foreach(canvas->impl->redraw_region, (GFunc)g_free, NULL);
+		g_slist_free(canvas->impl->redraw_region);
+		canvas->impl->redraw_region = NULL;
+		canvas->impl->redraw_x1   = 0;
+		canvas->impl->redraw_y1   = 0;
+		canvas->impl->redraw_x2   = 0;
+		canvas->impl->redraw_y2   = 0;
+	}
+
+	if (canvas->impl->grabbed_item) {
+		canvas->impl->grabbed_item = NULL;
+		gdk_pointer_ungrab(GDK_CURRENT_TIME);
+	}
+
+	remove_idle(canvas);
+}
+
+/* Destroy handler for GanvCanvas */
+static void
+ganv_canvas_destroy(GtkObject* object)
+{
+	g_return_if_fail(GANV_IS_CANVAS(object));
+
+	/* remember, destroy can be run multiple times! */
+
+	GanvCanvas* canvas = GANV_CANVAS(object);
+
+	if (canvas->impl->root_destroy_id) {
+		g_signal_handler_disconnect(canvas->impl->root, canvas->impl->root_destroy_id);
+		canvas->impl->root_destroy_id = 0;
+	}
+	if (canvas->impl->root) {
+		gtk_object_destroy(GTK_OBJECT(canvas->impl->root));
+		g_object_unref(G_OBJECT(canvas->impl->root));
+		canvas->impl->root = NULL;
+	}
+
+	shutdown_transients(canvas);
+
+	if (GTK_OBJECT_CLASS(canvas_parent_class)->destroy) {
+		(*GTK_OBJECT_CLASS(canvas_parent_class)->destroy)(object);
+	}
+}
+
+GanvCanvas*
+ganv_canvas_new(double width, double height)
+{
+	GanvCanvas* canvas = GANV_CANVAS(
+		g_object_new(ganv_canvas_get_type(),
+		             "width", width,
+		             "height", height,
+		             NULL));
+
+	ganv_canvas_set_scroll_region(canvas, 0.0, 0.0, width, height);
+
+	return canvas;
+}
+
+void
+ganv_canvas_set_wrapper(GanvCanvas* canvas, void* wrapper)
+{
+	canvas->impl->_wrapper = (Ganv::Canvas*)wrapper;
+}
+
+void*
+ganv_canvas_get_wrapper(GanvCanvas* canvas)
+{
+	return canvas->impl->_wrapper;
+}
+
+/* Map handler for the canvas */
+static void
+ganv_canvas_map(GtkWidget* widget)
+{
+	g_return_if_fail(GANV_IS_CANVAS(widget));
+
+	/* Normal widget mapping stuff */
+
+	if (GTK_WIDGET_CLASS(canvas_parent_class)->map) {
+		(*GTK_WIDGET_CLASS(canvas_parent_class)->map)(widget);
+	}
+
+	GanvCanvas* canvas = GANV_CANVAS(widget);
+
+	if (canvas->impl->need_update) {
+		add_idle(canvas);
+	}
+
+	/* Map items */
+
+	if (GANV_ITEM_GET_CLASS(canvas->impl->root)->map) {
+		(*GANV_ITEM_GET_CLASS(canvas->impl->root)->map)(canvas->impl->root);
+	}
+}
+
+/* Unmap handler for the canvas */
+static void
+ganv_canvas_unmap(GtkWidget* widget)
+{
+	g_return_if_fail(GANV_IS_CANVAS(widget));
+
+	GanvCanvas* canvas = GANV_CANVAS(widget);
+
+	shutdown_transients(canvas);
+
+	/* Unmap items */
+
+	if (GANV_ITEM_GET_CLASS(canvas->impl->root)->unmap) {
+		(*GANV_ITEM_GET_CLASS(canvas->impl->root)->unmap)(canvas->impl->root);
+	}
+
+	/* Normal widget unmapping stuff */
+
+	if (GTK_WIDGET_CLASS(canvas_parent_class)->unmap) {
+		(*GTK_WIDGET_CLASS(canvas_parent_class)->unmap)(widget);
+	}
+}
+
+/* Realize handler for the canvas */
+static void
+ganv_canvas_realize(GtkWidget* widget)
+{
+	g_return_if_fail(GANV_IS_CANVAS(widget));
+
+	/* Normal widget realization stuff */
+
+	if (GTK_WIDGET_CLASS(canvas_parent_class)->realize) {
+		(*GTK_WIDGET_CLASS(canvas_parent_class)->realize)(widget);
+	}
+
+	GanvCanvas* canvas = GANV_CANVAS(widget);
+
+	gdk_window_set_events(
+		canvas->layout.bin_window,
+		(GdkEventMask)(gdk_window_get_events(canvas->layout.bin_window)
+		               | GDK_EXPOSURE_MASK
+		               | GDK_BUTTON_PRESS_MASK
+		               | GDK_BUTTON_RELEASE_MASK
+		               | GDK_POINTER_MOTION_MASK
+		               | GDK_KEY_PRESS_MASK
+		               | GDK_KEY_RELEASE_MASK
+		               | GDK_ENTER_NOTIFY_MASK
+		               | GDK_LEAVE_NOTIFY_MASK
+		               | GDK_FOCUS_CHANGE_MASK));
+
+	/* Create our own temporary pixmap gc and realize all the items */
+
+	canvas->impl->pixmap_gc = gdk_gc_new(canvas->layout.bin_window);
+
+	(*GANV_ITEM_GET_CLASS(canvas->impl->root)->realize)(canvas->impl->root);
+
+	canvas->impl->_animate_idle_id = g_timeout_add(
+		120, GanvCanvasImpl::on_animate_timeout, canvas->impl);
+}
+
+/* Unrealize handler for the canvas */
+static void
+ganv_canvas_unrealize(GtkWidget* widget)
+{
+	g_return_if_fail(GANV_IS_CANVAS(widget));
+
+	GanvCanvas* canvas = GANV_CANVAS(widget);
+
+	if (canvas->impl->_animate_idle_id) {
+		g_source_remove(canvas->impl->_animate_idle_id);
+		canvas->impl->_animate_idle_id = 0;
+	}
+	while (g_idle_remove_by_data(canvas->impl)) {}
+
+	shutdown_transients(canvas);
+
+	/* Unrealize items and parent widget */
+
+	(*GANV_ITEM_GET_CLASS(canvas->impl->root)->unrealize)(canvas->impl->root);
+
+	g_object_unref(canvas->impl->pixmap_gc);
+	canvas->impl->pixmap_gc = NULL;
+
+	if (GTK_WIDGET_CLASS(canvas_parent_class)->unrealize) {
+		(*GTK_WIDGET_CLASS(canvas_parent_class)->unrealize)(widget);
+	}
+}
+
+/* Handles scrolling of the canvas.  Adjusts the scrolling and zooming offset to
+ * keep as much as possible of the canvas scrolling region in view.
+ */
+static void
+scroll_to(GanvCanvas* canvas, int cx, int cy)
+{
+	int scroll_width, scroll_height;
+	int right_limit, bottom_limit;
+	int old_zoom_xofs, old_zoom_yofs;
+	int changed_x = FALSE, changed_y = FALSE;
+	int canvas_width, canvas_height;
+
+	canvas_width  = GTK_WIDGET(canvas)->allocation.width;
+	canvas_height = GTK_WIDGET(canvas)->allocation.height;
+
+	scroll_width = floor((canvas->impl->scroll_x2 - canvas->impl->scroll_x1) * canvas->impl->pixels_per_unit
+	                     + 0.5);
+	scroll_height = floor((canvas->impl->scroll_y2 - canvas->impl->scroll_y1) * canvas->impl->pixels_per_unit
+	                      + 0.5);
+
+	right_limit  = scroll_width - canvas_width;
+	bottom_limit = scroll_height - canvas_height;
+
+	old_zoom_xofs = canvas->impl->zoom_xofs;
+	old_zoom_yofs = canvas->impl->zoom_yofs;
+
+	if (right_limit < 0) {
+		cx = 0;
+
+		if (canvas->impl->center_scroll_region) {
+			canvas->impl->zoom_xofs = (canvas_width - scroll_width) / 2;
+			scroll_width      = canvas_width;
+		} else {
+			canvas->impl->zoom_xofs = 0;
+		}
+	} else if (cx < 0) {
+		cx                = 0;
+		canvas->impl->zoom_xofs = 0;
+	} else if (cx > right_limit) {
+		cx                = right_limit;
+		canvas->impl->zoom_xofs = 0;
+	} else {
+		canvas->impl->zoom_xofs = 0;
+	}
+
+	if (bottom_limit < 0) {
+		cy = 0;
+
+		if (canvas->impl->center_scroll_region) {
+			canvas->impl->zoom_yofs = (canvas_height - scroll_height) / 2;
+			scroll_height     = canvas_height;
+		} else {
+			canvas->impl->zoom_yofs = 0;
+		}
+	} else if (cy < 0) {
+		cy                = 0;
+		canvas->impl->zoom_yofs = 0;
+	} else if (cy > bottom_limit) {
+		cy                = bottom_limit;
+		canvas->impl->zoom_yofs = 0;
+	} else {
+		canvas->impl->zoom_yofs = 0;
+	}
+
+	if ((canvas->impl->zoom_xofs != old_zoom_xofs) || (canvas->impl->zoom_yofs != old_zoom_yofs)) {
+		ganv_canvas_request_update(canvas);
+		gtk_widget_queue_draw(GTK_WIDGET(canvas));
+	}
+
+	if (canvas->layout.hadjustment && ( ((int)canvas->layout.hadjustment->value) != cx) ) {
+		canvas->layout.hadjustment->value = cx;
+		changed_x                         = TRUE;
+	}
+
+	if (canvas->layout.vadjustment && ( ((int)canvas->layout.vadjustment->value) != cy) ) {
+		canvas->layout.vadjustment->value = cy;
+		changed_y                         = TRUE;
+	}
+
+	if ((scroll_width != (int)canvas->layout.width)
+	    || (scroll_height != (int)canvas->layout.height)) {
+		gtk_layout_set_size(GTK_LAYOUT(canvas), scroll_width, scroll_height);
+	}
+
+	/* Signal GtkLayout that it should do a redraw. */
+
+	if (changed_x) {
+		g_signal_emit_by_name(canvas->layout.hadjustment, "value_changed");
+	}
+
+	if (changed_y) {
+		g_signal_emit_by_name(canvas->layout.vadjustment, "value_changed");
+	}
+}
+
+/* Size allocation handler for the canvas */
+static void
+ganv_canvas_size_allocate(GtkWidget* widget, GtkAllocation* allocation)
+{
+	g_return_if_fail(GANV_IS_CANVAS(widget));
+	g_return_if_fail(allocation != NULL);
+
+	if (GTK_WIDGET_CLASS(canvas_parent_class)->size_allocate) {
+		(*GTK_WIDGET_CLASS(canvas_parent_class)->size_allocate)(widget, allocation);
+	}
+
+	GanvCanvas* canvas = GANV_CANVAS(widget);
+
+	/* Recenter the view, if appropriate */
+
+	canvas->layout.hadjustment->page_size      = allocation->width;
+	canvas->layout.hadjustment->page_increment = allocation->width / 2;
+
+	canvas->layout.vadjustment->page_size      = allocation->height;
+	canvas->layout.vadjustment->page_increment = allocation->height / 2;
+
+	scroll_to(canvas,
+	          canvas->layout.hadjustment->value,
+	          canvas->layout.vadjustment->value);
+
+	g_signal_emit_by_name(canvas->layout.hadjustment, "changed");
+	g_signal_emit_by_name(canvas->layout.vadjustment, "changed");
+}
+
+/* Returns whether the item is an inferior of or is equal to the parent. */
+static gboolean
+is_descendant(GanvItem* item, GanvItem* parent)
+{
+	for (; item; item = item->impl->parent) {
+		if (item == parent) {
+			return TRUE;
+		}
+	}
+
+	return FALSE;
+}
+
+
+/* Emits an event for an item in the canvas, be it the current item, grabbed
+ * item, or focused item, as appropriate.
+ */
+int
+ganv_canvas_emit_event(GanvCanvas* canvas, GdkEvent* event)
+{
+	GdkEvent* ev;
+	gint      finished;
+	GanvItem* item;
+	GanvItem* parent;
+	guint     mask;
+
+	/* Perform checks for grabbed items */
+
+	if (canvas->impl->grabbed_item
+	    && !is_descendant(canvas->impl->current_item, canvas->impl->grabbed_item)) {
+		/* I think this warning is annoying and I don't know what it's for
+		 * so I'll disable it for now.
+		 */
+		/*                g_warning ("emit_event() returning FALSE!\n");*/
+		return FALSE;
+	}
+
+	if (canvas->impl->grabbed_item) {
+		switch (event->type) {
+		case GDK_ENTER_NOTIFY:
+			mask = GDK_ENTER_NOTIFY_MASK;
+			break;
+
+		case GDK_LEAVE_NOTIFY:
+			mask = GDK_LEAVE_NOTIFY_MASK;
+			break;
+
+		case GDK_MOTION_NOTIFY:
+			mask = GDK_POINTER_MOTION_MASK;
+			break;
+
+		case GDK_BUTTON_PRESS:
+		case GDK_2BUTTON_PRESS:
+		case GDK_3BUTTON_PRESS:
+			mask = GDK_BUTTON_PRESS_MASK;
+			break;
+
+		case GDK_BUTTON_RELEASE:
+			mask = GDK_BUTTON_RELEASE_MASK;
+			break;
+
+		case GDK_KEY_PRESS:
+			mask = GDK_KEY_PRESS_MASK;
+			break;
+
+		case GDK_KEY_RELEASE:
+			mask = GDK_KEY_RELEASE_MASK;
+			break;
+
+		case GDK_SCROLL:
+			mask = GDK_SCROLL_MASK;
+			break;
+
+		default:
+			mask = 0;
+			break;
+		}
+
+		if (!(mask & canvas->impl->grabbed_event_mask)) {
+			return FALSE;
+		}
+	}
+
+	/* Convert to world coordinates -- we have two cases because of diferent
+	 * offsets of the fields in the event structures.
+	 */
+
+	ev = gdk_event_copy(event);
+
+	switch (ev->type) {
+	case GDK_ENTER_NOTIFY:
+	case GDK_LEAVE_NOTIFY:
+		ganv_canvas_window_to_world(canvas,
+		                            ev->crossing.x, ev->crossing.y,
+		                            &ev->crossing.x, &ev->crossing.y);
+		break;
+
+	case GDK_MOTION_NOTIFY:
+	case GDK_BUTTON_PRESS:
+	case GDK_2BUTTON_PRESS:
+	case GDK_3BUTTON_PRESS:
+	case GDK_BUTTON_RELEASE:
+		ganv_canvas_window_to_world(canvas,
+		                            ev->motion.x, ev->motion.y,
+		                            &ev->motion.x, &ev->motion.y);
+		break;
+
+	default:
+		break;
+	}
+
+	/* Choose where we send the event */
+
+	item = canvas->impl->current_item;
+
+	if (canvas->impl->focused_item
+	    && ((event->type == GDK_KEY_PRESS)
+	        || (event->type == GDK_KEY_RELEASE)
+	        || (event->type == GDK_FOCUS_CHANGE))) {
+		item = canvas->impl->focused_item;
+	}
+
+	/* The event is propagated up the hierarchy (for if someone connected to
+	 * a group instead of a leaf event), and emission is stopped if a
+	 * handler returns TRUE, just like for GtkWidget events.
+	 */
+
+	finished = FALSE;
+
+	while (item && !finished) {
+		g_object_ref(G_OBJECT(item));
+
+		ganv_item_emit_event(item, ev, &finished);
+
+		parent = item->impl->parent;
+		g_object_unref(G_OBJECT(item));
+
+		item = parent;
+	}
+
+	gdk_event_free(ev);
+
+	return finished;
+}
+
+void
+ganv_canvas_set_need_repick(GanvCanvas* canvas)
+{
+	canvas->impl->need_repick = TRUE;
+}
+
+void
+ganv_canvas_forget_item(GanvCanvas* canvas, GanvItem* item)
+{
+	if (canvas->impl && item == canvas->impl->current_item) {
+		canvas->impl->current_item = NULL;
+		canvas->impl->need_repick  = TRUE;
+	}
+
+	if (canvas->impl && item == canvas->impl->new_current_item) {
+		canvas->impl->new_current_item = NULL;
+		canvas->impl->need_repick      = TRUE;
+	}
+
+	if (canvas->impl && item == canvas->impl->grabbed_item) {
+		canvas->impl->grabbed_item = NULL;
+		gdk_pointer_ungrab(GDK_CURRENT_TIME);
+	}
+
+	if (canvas->impl && item == canvas->impl->focused_item) {
+		canvas->impl->focused_item = NULL;
+	}
+}
+
+void
+ganv_canvas_grab_focus(GanvCanvas* canvas, GanvItem* item)
+{
+	g_return_if_fail(GANV_IS_ITEM(item));
+	g_return_if_fail(GTK_WIDGET_CAN_FOCUS(GTK_WIDGET(canvas)));
+
+	GanvItem* focused_item = canvas->impl->focused_item;
+	GdkEvent  ev;
+
+	if (focused_item) {
+		ev.focus_change.type       = GDK_FOCUS_CHANGE;
+		ev.focus_change.window     = canvas->layout.bin_window;
+		ev.focus_change.send_event = FALSE;
+		ev.focus_change.in         = FALSE;
+
+		ganv_canvas_emit_event(canvas, &ev);
+	}
+
+	canvas->impl->focused_item = item;
+	gtk_widget_grab_focus(GTK_WIDGET(canvas));
+
+	if (focused_item) {
+		ev.focus_change.type       = GDK_FOCUS_CHANGE;
+		ev.focus_change.window     = canvas->layout.bin_window;
+		ev.focus_change.send_event = FALSE;
+		ev.focus_change.in         = TRUE;
+
+		ganv_canvas_emit_event(canvas, &ev);
+	}
+}
+
+/**
+ * ganv_canvas_grab_item:
+ * @item: A canvas item.
+ * @event_mask: Mask of events that will be sent to this item.
+ * @cursor: If non-NULL, the cursor that will be used while the grab is active.
+ * @etime: The timestamp required for grabbing the mouse, or GDK_CURRENT_TIME.
+ *
+ * Specifies that all events that match the specified event mask should be sent
+ * to the specified item, and also grabs the mouse by calling
+ * gdk_pointer_grab().  The event mask is also used when grabbing the pointer.
+ * If @cursor is not NULL, then that cursor is used while the grab is active.
+ * The @etime parameter is the timestamp required for grabbing the mouse.
+ *
+ * Return value: If an item was already grabbed, it returns %GDK_GRAB_ALREADY_GRABBED.  If
+ * the specified item was hidden by calling ganv_item_hide(), then it
+ * returns %GDK_GRAB_NOT_VIEWABLE.  Else, it returns the result of calling
+ * gdk_pointer_grab().
+ **/
+int
+ganv_canvas_grab_item(GanvItem* item, guint event_mask, GdkCursor* cursor, guint32 etime)
+{
+	g_return_val_if_fail(GANV_IS_ITEM(item), GDK_GRAB_NOT_VIEWABLE);
+	g_return_val_if_fail(GTK_WIDGET_MAPPED(item->impl->canvas), GDK_GRAB_NOT_VIEWABLE);
+
+	if (item->impl->canvas->impl->grabbed_item) {
+		return GDK_GRAB_ALREADY_GRABBED;
+	}
+
+	if (!(item->object.flags & GANV_ITEM_VISIBLE)) {
+		return GDK_GRAB_NOT_VIEWABLE;
+	}
+
+	int retval = gdk_pointer_grab(item->impl->canvas->layout.bin_window,
+	                              FALSE,
+	                              (GdkEventMask)event_mask,
+	                              NULL,
+	                              cursor,
+	                              etime);
+
+	if (retval != GDK_GRAB_SUCCESS) {
+		return retval;
+	}
+
+	item->impl->canvas->impl->grabbed_item       = item;
+	item->impl->canvas->impl->grabbed_event_mask = event_mask;
+	item->impl->canvas->impl->current_item       = item; /* So that events go to the grabbed item */
+
+	return retval;
+}
+
+/**
+ * ganv_canvas_ungrab_item:
+ * @item: A canvas item that holds a grab.
+ * @etime: The timestamp for ungrabbing the mouse.
+ *
+ * Ungrabs the item, which must have been grabbed in the canvas, and ungrabs the
+ * mouse.
+ **/
+void
+ganv_canvas_ungrab_item(GanvItem* item, guint32 etime)
+{
+	g_return_if_fail(GANV_IS_ITEM(item));
+
+	if (item->impl->canvas->impl->grabbed_item != item) {
+		return;
+	}
+
+	item->impl->canvas->impl->grabbed_item = NULL;
+
+	gdk_pointer_ungrab(etime);
+}
+
+void
+ganv_canvas_get_zoom_offsets(GanvCanvas* canvas, int* x, int* y)
+{
+	*x = canvas->impl->zoom_xofs;
+	*y = canvas->impl->zoom_yofs;
+}
+
+/* Re-picks the current item in the canvas, based on the event's coordinates.
+ * Also emits enter/leave events for items as appropriate.
+ */
+static int
+pick_current_item(GanvCanvas* canvas, GdkEvent* event)
+{
+	int retval = FALSE;
+
+	/* If a button is down, we'll perform enter and leave events on the
+	 * current item, but not enter on any other item.  This is more or less
+	 * like X pointer grabbing for canvas items.
+	 */
+	int button_down = canvas->impl->state & (GDK_BUTTON1_MASK
+	                                         | GDK_BUTTON2_MASK
+	                                         | GDK_BUTTON3_MASK
+	                                         | GDK_BUTTON4_MASK
+	                                         | GDK_BUTTON5_MASK);
+	if (!button_down) {
+		canvas->impl->left_grabbed_item = FALSE;
+	}
+
+	/* Save the event in the canvas.  This is used to synthesize enter and
+	 * leave events in case the current item changes.  It is also used to
+	 * re-pick the current item if the current one gets deleted.  Also,
+	 * synthesize an enter event.
+	 */
+	if (event != &canvas->impl->pick_event) {
+		if ((event->type == GDK_MOTION_NOTIFY) || (event->type == GDK_BUTTON_RELEASE)) {
+			/* these fields have the same offsets in both types of events */
+
+			canvas->impl->pick_event.crossing.type       = GDK_ENTER_NOTIFY;
+			canvas->impl->pick_event.crossing.window     = event->motion.window;
+			canvas->impl->pick_event.crossing.send_event = event->motion.send_event;
+			canvas->impl->pick_event.crossing.subwindow  = NULL;
+			canvas->impl->pick_event.crossing.x          = event->motion.x;
+			canvas->impl->pick_event.crossing.y          = event->motion.y;
+			canvas->impl->pick_event.crossing.mode       = GDK_CROSSING_NORMAL;
+			canvas->impl->pick_event.crossing.detail     = GDK_NOTIFY_NONLINEAR;
+			canvas->impl->pick_event.crossing.focus      = FALSE;
+			canvas->impl->pick_event.crossing.state      = event->motion.state;
+
+			/* these fields don't have the same offsets in both types of events */
+
+			if (event->type == GDK_MOTION_NOTIFY) {
+				canvas->impl->pick_event.crossing.x_root = event->motion.x_root;
+				canvas->impl->pick_event.crossing.y_root = event->motion.y_root;
+			} else {
+				canvas->impl->pick_event.crossing.x_root = event->button.x_root;
+				canvas->impl->pick_event.crossing.y_root = event->button.y_root;
+			}
+		} else {
+			canvas->impl->pick_event = *event;
+		}
+	}
+
+	/* Don't do anything else if this is a recursive call */
+
+	if (canvas->impl->in_repick) {
+		return retval;
+	}
+
+	/* LeaveNotify means that there is no current item, so we don't look for one */
+
+	if (canvas->impl->pick_event.type != GDK_LEAVE_NOTIFY) {
+		/* these fields don't have the same offsets in both types of events */
+
+		double x, y;
+		if (canvas->impl->pick_event.type == GDK_ENTER_NOTIFY) {
+			x = canvas->impl->pick_event.crossing.x - canvas->impl->zoom_xofs;
+			y = canvas->impl->pick_event.crossing.y - canvas->impl->zoom_yofs;
+		} else {
+			x = canvas->impl->pick_event.motion.x - canvas->impl->zoom_xofs;
+			y = canvas->impl->pick_event.motion.y - canvas->impl->zoom_yofs;
+		}
+
+		/* world coords */
+
+		x = canvas->impl->scroll_x1 + x / canvas->impl->pixels_per_unit;
+		y = canvas->impl->scroll_y1 + y / canvas->impl->pixels_per_unit;
+
+		/* find the closest item */
+
+		if (canvas->impl->root->object.flags & GANV_ITEM_VISIBLE) {
+			GANV_ITEM_GET_CLASS(canvas->impl->root)->point(
+				canvas->impl->root,
+				x - canvas->impl->root->impl->x, y - canvas->impl->root->impl->y,
+				&canvas->impl->new_current_item);
+		} else {
+			canvas->impl->new_current_item = NULL;
+		}
+	} else {
+		canvas->impl->new_current_item = NULL;
+	}
+
+	if ((canvas->impl->new_current_item == canvas->impl->current_item) && !canvas->impl->left_grabbed_item) {
+		return retval; /* current item did not change */
+
+	}
+	/* Synthesize events for old and new current items */
+
+	if ((canvas->impl->new_current_item != canvas->impl->current_item)
+	    && (canvas->impl->current_item != NULL)
+	    && !canvas->impl->left_grabbed_item) {
+		GdkEvent new_event;
+
+		new_event      = canvas->impl->pick_event;
+		new_event.type = GDK_LEAVE_NOTIFY;
+
+		new_event.crossing.detail    = GDK_NOTIFY_ANCESTOR;
+		new_event.crossing.subwindow = NULL;
+		canvas->impl->in_repick      = TRUE;
+		retval                       = ganv_canvas_emit_event(canvas, &new_event);
+		canvas->impl->in_repick      = FALSE;
+	}
+
+	/* new_current_item may have been set to NULL during the call to ganv_canvas_emit_event() above */
+
+	if ((canvas->impl->new_current_item != canvas->impl->current_item) && button_down) {
+		canvas->impl->left_grabbed_item = TRUE;
+		return retval;
+	}
+
+	/* Handle the rest of cases */
+
+	canvas->impl->left_grabbed_item = FALSE;
+	canvas->impl->current_item      = canvas->impl->new_current_item;
+
+	if (canvas->impl->current_item != NULL) {
+		GdkEvent new_event;
+
+		new_event                    = canvas->impl->pick_event;
+		new_event.type               = GDK_ENTER_NOTIFY;
+		new_event.crossing.detail    = GDK_NOTIFY_ANCESTOR;
+		new_event.crossing.subwindow = NULL;
+		retval                       = ganv_canvas_emit_event(canvas, &new_event);
+	}
+
+	return retval;
+}
+
+/* Button event handler for the canvas */
+static gint
+ganv_canvas_button(GtkWidget* widget, GdkEventButton* event)
+{
+	int mask;
+	int retval;
+
+	g_return_val_if_fail(GANV_IS_CANVAS(widget), FALSE);
+	g_return_val_if_fail(event != NULL, FALSE);
+
+	retval = FALSE;
+
+	GanvCanvas* canvas = GANV_CANVAS(widget);
+
+	/*
+	 * dispatch normally regardless of the event's window if an item has
+	 * has a pointer grab in effect
+	 */
+	if (!canvas->impl->grabbed_item && ( event->window != canvas->layout.bin_window) ) {
+		return retval;
+	}
+
+	switch (event->button) {
+	case 1:
+		mask = GDK_BUTTON1_MASK;
+		break;
+	case 2:
+		mask = GDK_BUTTON2_MASK;
+		break;
+	case 3:
+		mask = GDK_BUTTON3_MASK;
+		break;
+	case 4:
+		mask = GDK_BUTTON4_MASK;
+		break;
+	case 5:
+		mask = GDK_BUTTON5_MASK;
+		break;
+	default:
+		mask = 0;
+	}
+
+	switch (event->type) {
+	case GDK_BUTTON_PRESS:
+	case GDK_2BUTTON_PRESS:
+	case GDK_3BUTTON_PRESS:
+		/* Pick the current item as if the button were not pressed, and
+		 * then process the event.
+		 */
+		canvas->impl->state = event->state;
+		pick_current_item(canvas, (GdkEvent*)event);
+		canvas->impl->state ^= mask;
+		retval         = ganv_canvas_emit_event(canvas, (GdkEvent*)event);
+		break;
+
+	case GDK_BUTTON_RELEASE:
+		/* Process the event as if the button were pressed, then repick
+		 * after the button has been released
+		 */
+		canvas->impl->state = event->state;
+		retval        = ganv_canvas_emit_event(canvas, (GdkEvent*)event);
+		event->state ^= mask;
+		canvas->impl->state = event->state;
+		pick_current_item(canvas, (GdkEvent*)event);
+		event->state ^= mask;
+		break;
+
+	default:
+		g_assert_not_reached();
+	}
+
+	return retval;
+}
+
+/* Motion event handler for the canvas */
+static gint
+ganv_canvas_motion(GtkWidget* widget, GdkEventMotion* event)
+{
+	g_return_val_if_fail(GANV_IS_CANVAS(widget), FALSE);
+	g_return_val_if_fail(event != NULL, FALSE);
+
+	GanvCanvas* canvas = GANV_CANVAS(widget);
+
+	if (event->window != canvas->layout.bin_window) {
+		return FALSE;
+	}
+
+	canvas->impl->state = event->state;
+	pick_current_item(canvas, (GdkEvent*)event);
+	return ganv_canvas_emit_event(canvas, (GdkEvent*)event);
+}
+
+static gboolean
+ganv_canvas_scroll(GtkWidget* widget, GdkEventScroll* event)
+{
+	g_return_val_if_fail(GANV_IS_CANVAS(widget), FALSE);
+	g_return_val_if_fail(event != NULL, FALSE);
+
+	GanvCanvas* canvas = GANV_CANVAS(widget);
+
+	if (event->window != canvas->layout.bin_window) {
+		return FALSE;
+	}
+
+	canvas->impl->state = event->state;
+	pick_current_item(canvas, (GdkEvent*)event);
+	return ganv_canvas_emit_event(canvas, (GdkEvent*)event);
+}
+
+/* Key event handler for the canvas */
+static gboolean
+ganv_canvas_key(GtkWidget* widget, GdkEventKey* event)
+{
+	g_return_val_if_fail(GANV_IS_CANVAS(widget), FALSE);
+	g_return_val_if_fail(event != NULL, FALSE);
+
+	GanvCanvas* canvas = GANV_CANVAS(widget);
+
+	if (!ganv_canvas_emit_event(canvas, (GdkEvent*)event)) {
+		GtkWidgetClass* widget_class;
+
+		widget_class = GTK_WIDGET_CLASS(canvas_parent_class);
+
+		if (event->type == GDK_KEY_PRESS) {
+			if (widget_class->key_press_event) {
+				return (*widget_class->key_press_event)(widget, event);
+			}
+		} else if (event->type == GDK_KEY_RELEASE) {
+			if (widget_class->key_release_event) {
+				return (*widget_class->key_release_event)(widget, event);
+			}
+		} else {
+			g_assert_not_reached();
+		}
+
+		return FALSE;
+	} else {
+		return TRUE;
+	}
+}
+
+/* Crossing event handler for the canvas */
+static gint
+ganv_canvas_crossing(GtkWidget* widget, GdkEventCrossing* event)
+{
+	g_return_val_if_fail(GANV_IS_CANVAS(widget), FALSE);
+	g_return_val_if_fail(event != NULL, FALSE);
+
+	GanvCanvas* canvas = GANV_CANVAS(widget);
+
+	if (event->window != canvas->layout.bin_window) {
+		return FALSE;
+	}
+
+	canvas->impl->state = event->state;
+	return pick_current_item(canvas, (GdkEvent*)event);
+}
+
+/* Focus in handler for the canvas */
+static gint
+ganv_canvas_focus_in(GtkWidget* widget, GdkEventFocus* event)
+{
+	GTK_WIDGET_SET_FLAGS(widget, GTK_HAS_FOCUS);
+
+	GanvCanvas* canvas = GANV_CANVAS(widget);
+
+	if (canvas->impl->focused_item) {
+		return ganv_canvas_emit_event(canvas, (GdkEvent*)event);
+	} else {
+		return FALSE;
+	}
+}
+
+/* Focus out handler for the canvas */
+static gint
+ganv_canvas_focus_out(GtkWidget* widget, GdkEventFocus* event)
+{
+	GTK_WIDGET_UNSET_FLAGS(widget, GTK_HAS_FOCUS);
+
+	GanvCanvas* canvas = GANV_CANVAS(widget);
+
+	if (canvas->impl->focused_item) {
+		return ganv_canvas_emit_event(canvas, (GdkEvent*)event);
+	} else {
+		return FALSE;
+	}
+}
+
+#define REDRAW_QUANTUM_SIZE 512
+
+static void
+ganv_canvas_paint_rect(GanvCanvas* canvas, gint x0, gint y0, gint x1, gint y1)
+{
+	gint draw_x1, draw_y1;
+	gint draw_x2, draw_y2;
+	gint draw_width, draw_height;
+
+	g_return_if_fail(!canvas->impl->need_update);
+
+	draw_x1 = MAX(x0, canvas->layout.hadjustment->value - canvas->impl->zoom_xofs);
+	draw_y1 = MAX(y0, canvas->layout.vadjustment->value - canvas->impl->zoom_yofs);
+	draw_x2 = MIN(draw_x1 + GTK_WIDGET(canvas)->allocation.width, x1);
+	draw_y2 = MIN(draw_y1 + GTK_WIDGET(canvas)->allocation.height, y1);
+
+	draw_width  = draw_x2 - draw_x1;
+	draw_height = draw_y2 - draw_y1;
+
+	if ((draw_width < 1) || (draw_height < 1)) {
+		return;
+	}
+
+	canvas->impl->redraw_x1 = draw_x1;
+	canvas->impl->redraw_y1 = draw_y1;
+	canvas->impl->redraw_x2 = draw_x2;
+	canvas->impl->redraw_y2 = draw_y2;
+	canvas->impl->draw_xofs = draw_x1;
+	canvas->impl->draw_yofs = draw_y1;
+
+	cairo_t* cr = gdk_cairo_create(canvas->layout.bin_window);
+
+	double win_x, win_y;
+	ganv_canvas_window_to_world(canvas, 0, 0, &win_x, &win_y);
+	cairo_translate(cr, -win_x, -win_y);
+	cairo_scale(cr, canvas->impl->pixels_per_unit, canvas->impl->pixels_per_unit);
+
+	if (canvas->impl->root->object.flags & GANV_ITEM_VISIBLE) {
+		double wx1, wy1, ww, wh;
+		ganv_canvas_c2w(canvas, draw_x1, draw_y1, &wx1, &wy1);
+		ganv_canvas_c2w(canvas, draw_width, draw_height, &ww, &wh);
+
+		// Draw background
+		double r, g, b, a;
+		color_to_rgba(DEFAULT_BACKGROUND_COLOR, &r, &g, &b, &a);
+		cairo_set_source_rgba(cr, r, g, b, a);
+		cairo_rectangle(cr, wx1, wy1, ww, wh);
+		cairo_fill(cr);
+
+		// Draw root group
+		(*GANV_ITEM_GET_CLASS(canvas->impl->root)->draw)(
+			canvas->impl->root, cr,
+			wx1, wy1, ww, wh);
+	}
+
+	cairo_destroy(cr);
+}
+
+/* Expose handler for the canvas */
+static gint
+ganv_canvas_expose(GtkWidget* widget, GdkEventExpose* event)
+{
+	GanvCanvas* canvas = GANV_CANVAS(widget);
+	if (!GTK_WIDGET_DRAWABLE(widget) ||
+	    (event->window != canvas->layout.bin_window)) {
+		return FALSE;
+	}
+
+	/* Find a single bounding rectangle for all rectangles in the region.
+	   Since drawing the root group is O(n) and thus very expensive for large
+	   canvases, it's much faster to do a single paint than many, even though
+	   more area may be painted that way.  With a better group implementation,
+	   it would likely be better to paint each changed rectangle separately. */
+	GdkRectangle clip;
+	gdk_region_get_clipbox(event->region, &clip);
+
+	const int x2 = clip.x + clip.width;
+	const int y2 = clip.y + clip.height;
+
+	if (canvas->impl->need_update || canvas->impl->need_redraw) {
+		/* Update or drawing is scheduled, so just mark exposed area as dirty */
+		ganv_canvas_request_redraw_c(canvas, clip.x, clip.y, x2, y2);
+	} else {
+		/* No pending updates, draw exposed area immediately */
+		ganv_canvas_paint_rect(canvas, clip.x, clip.y, x2, y2);
+
+		/* And call expose on parent container class */
+		if (GTK_WIDGET_CLASS(canvas_parent_class)->expose_event) {
+			(*GTK_WIDGET_CLASS(canvas_parent_class)->expose_event)(
+				widget, event);
+		}
+	}
+
+	return FALSE;
+}
+
+/* Repaints the areas in the canvas that need it */
+static void
+paint(GanvCanvas* canvas)
+{
+	for (GSList* l = canvas->impl->redraw_region; l; l = l->next) {
+		IRect* rect = (IRect*)l->data;
+
+		const GdkRectangle gdkrect = {
+			rect->x + canvas->impl->zoom_xofs,
+			rect->y + canvas->impl->zoom_yofs,
+			rect->width,
+			rect->height
+		};
+
+		gdk_window_invalidate_rect(canvas->layout.bin_window, &gdkrect, FALSE);
+		g_free(rect);
+	}
+
+	g_slist_free(canvas->impl->redraw_region);
+	canvas->impl->redraw_region = NULL;
+	canvas->impl->need_redraw = FALSE;
+
+	canvas->impl->redraw_x1 = 0;
+	canvas->impl->redraw_y1 = 0;
+	canvas->impl->redraw_x2 = 0;
+	canvas->impl->redraw_y2 = 0;
+}
+
+static void
+do_update(GanvCanvas* canvas)
+{
+	/* Cause the update if necessary */
+
+update_again:
+	if (canvas->impl->need_update) {
+		ganv_item_invoke_update(canvas->impl->root, 0);
+
+		canvas->impl->need_update = FALSE;
+	}
+
+	/* Pick new current item */
+
+	while (canvas->impl->need_repick) {
+		canvas->impl->need_repick = FALSE;
+		pick_current_item(canvas, &canvas->impl->pick_event);
+	}
+
+	/* it is possible that during picking we emitted an event in which
+	   the user then called some function which then requested update
+	   of something.  Without this we'd be left in a state where
+	   need_update would have been left TRUE and the canvas would have
+	   been left unpainted. */
+	if (canvas->impl->need_update) {
+		goto update_again;
+	}
+
+	/* Paint if able to */
+
+	if (GTK_WIDGET_DRAWABLE(canvas) && canvas->impl->need_redraw) {
+		paint(canvas);
+	}
+}
+
+/* Idle handler for the canvas.  It deals with pending updates and redraws. */
+static gboolean
+idle_handler(gpointer data)
+{
+	GDK_THREADS_ENTER();
+
+	GanvCanvas* canvas = GANV_CANVAS(data);
+
+	do_update(canvas);
+
+	/* Reset idle id */
+	canvas->impl->idle_id = 0;
+
+	GDK_THREADS_LEAVE();
+
+	return FALSE;
+}
+
+/* Convenience function to add an idle handler to a canvas */
+static void
+add_idle(GanvCanvas* canvas)
+{
+	g_assert(canvas->impl->need_update || canvas->impl->need_redraw);
+
+	if (!canvas->impl->idle_id) {
+		canvas->impl->idle_id = g_idle_add_full(CANVAS_IDLE_PRIORITY,
+		                                        idle_handler,
+		                                        canvas,
+		                                        NULL);
+	}
+
+	/*      canvas->idle_id = gtk_idle_add (idle_handler, canvas); */
+}
+
+GanvItem*
+ganv_canvas_root(GanvCanvas* canvas)
+{
+	g_return_val_if_fail(GANV_IS_CANVAS(canvas), NULL);
+
+	return canvas->impl->root;
+}
+
+void
+ganv_canvas_set_scroll_region(GanvCanvas* canvas,
+                              double x1, double y1, double x2, double y2)
+{
+	double wxofs, wyofs;
+	int    xofs, yofs;
+
+	g_return_if_fail(GANV_IS_CANVAS(canvas));
+
+	/*
+	 * Set the new scrolling region.  If possible, do not move the visible contents of the
+	 * canvas.
+	 */
+
+	ganv_canvas_c2w(canvas,
+	                GTK_LAYOUT(canvas)->hadjustment->value + canvas->impl->zoom_xofs,
+	                GTK_LAYOUT(canvas)->vadjustment->value + canvas->impl->zoom_yofs,
+	                /*canvas->impl->zoom_xofs,
+	                  canvas->impl->zoom_yofs,*/
+	                &wxofs, &wyofs);
+
+	canvas->impl->scroll_x1 = x1;
+	canvas->impl->scroll_y1 = y1;
+	canvas->impl->scroll_x2 = x2;
+	canvas->impl->scroll_y2 = y2;
+
+	ganv_canvas_w2c(canvas, wxofs, wyofs, &xofs, &yofs);
+
+	scroll_to(canvas, xofs, yofs);
+
+	canvas->impl->need_repick = TRUE;
+#if 0
+	/* todo: should be requesting update */
+	(*GANV_ITEM_CLASS(canvas->impl->root->object.klass)->update)(
+		canvas->impl->root, NULL, NULL, 0);
+#endif
+}
+
+void
+ganv_canvas_get_scroll_region(GanvCanvas* canvas,
+                              double* x1, double* y1, double* x2, double* y2)
+{
+	g_return_if_fail(GANV_IS_CANVAS(canvas));
+
+	if (x1) {
+		*x1 = canvas->impl->scroll_x1;
+	}
+
+	if (y1) {
+		*y1 = canvas->impl->scroll_y1;
+	}
+
+	if (x2) {
+		*x2 = canvas->impl->scroll_x2;
+	}
+
+	if (y2) {
+		*y2 = canvas->impl->scroll_y2;
+	}
+}
+
+void
+ganv_canvas_set_center_scroll_region(GanvCanvas* canvas, gboolean center_scroll_region)
+{
+	g_return_if_fail(GANV_IS_CANVAS(canvas));
+
+	canvas->impl->center_scroll_region = center_scroll_region != 0;
+
+	scroll_to(canvas,
+	          canvas->layout.hadjustment->value,
+	          canvas->layout.vadjustment->value);
+}
+
+gboolean
+ganv_canvas_get_center_scroll_region(const GanvCanvas* canvas)
+{
+	g_return_val_if_fail(GANV_IS_CANVAS(canvas), FALSE);
+
+	return canvas->impl->center_scroll_region ? TRUE : FALSE;
+}
+
+void
+ganv_canvas_scroll_to(GanvCanvas* canvas, int cx, int cy)
+{
+	g_return_if_fail(GANV_IS_CANVAS(canvas));
+
+	scroll_to(canvas, cx, cy);
+}
+
+void
+ganv_canvas_get_scroll_offsets(const GanvCanvas* canvas, int* cx, int* cy)
+{
+	g_return_if_fail(GANV_IS_CANVAS(canvas));
+
+	if (cx) {
+		*cx = canvas->layout.hadjustment->value;
+	}
+
+	if (cy) {
+		*cy = canvas->layout.vadjustment->value;
+	}
+}
+
+GanvItem*
+ganv_canvas_get_item_at(GanvCanvas* canvas, double x, double y)
+{
+	g_return_val_if_fail(GANV_IS_CANVAS(canvas), NULL);
+
+	GanvItem* item = NULL;
+	double dist    = GANV_ITEM_GET_CLASS(canvas->impl->root)->point(
+		canvas->impl->root,
+		x - canvas->impl->root->impl->x,
+		y - canvas->impl->root->impl->y,
+		&item);
+	if ((int)(dist * canvas->impl->pixels_per_unit + 0.5) <= GANV_CLOSE_ENOUGH) {
+		return item;
+	} else {
+		return NULL;
+	}
+}
+
+void
+ganv_canvas_request_update(GanvCanvas* canvas)
+{
+	if (canvas->impl->need_update) {
+		return;
+	}
+
+	canvas->impl->need_update = TRUE;
+	if (GTK_WIDGET_MAPPED((GtkWidget*)canvas)) {
+		add_idle(canvas);
+	}
+}
+
+static inline gboolean
+rect_overlaps(const IRect* a, const IRect* b)
+{
+	if ((a->x             > b->x + b->width) ||
+	    (a->y             > b->y + b->height) ||
+	    (a->x + a->width  < b->x) ||
+	    (a->y + a->height < b->y)) {
+		return FALSE;
+	}
+	return TRUE;
+}
+
+static inline gboolean
+rect_is_visible(GanvCanvas* canvas, const IRect* r)
+{
+	const IRect rect = {
+		(int)(canvas->layout.hadjustment->value - canvas->impl->zoom_xofs),
+		(int)(canvas->layout.vadjustment->value - canvas->impl->zoom_yofs),
+		GTK_WIDGET(canvas)->allocation.width,
+		GTK_WIDGET(canvas)->allocation.height
+	};
+
+	return rect_overlaps(&rect, r);
+}
+
+void
+ganv_canvas_request_redraw_c(GanvCanvas* canvas,
+                             int x1, int y1, int x2, int y2)
+{
+	g_return_if_fail(GANV_IS_CANVAS(canvas));
+
+	if (!GTK_WIDGET_DRAWABLE(canvas) || (x1 >= x2) || (y1 >= y2)) {
+		return;
+	}
+
+	const IRect rect = { x1, y1, x2 - x1, y2 - y1 };
+
+	if (!rect_is_visible(canvas, &rect)) {
+		return;
+	}
+
+	IRect* r = (IRect*)g_malloc(sizeof(IRect));
+	*r = rect;
+
+	canvas->impl->redraw_region = g_slist_prepend(canvas->impl->redraw_region, r);
+	canvas->impl->need_redraw   = TRUE;
+
+	if (canvas->impl->idle_id == 0) {
+		add_idle(canvas);
+	}
+}
+
+/* Request a redraw of the specified rectangle in world coordinates */
+void
+ganv_canvas_request_redraw_w(GanvCanvas* canvas,
+                             double x1, double y1, double x2, double y2)
+{
+	int cx1, cx2, cy1, cy2;
+	ganv_canvas_w2c(canvas, x1, y1, &cx1, &cy1);
+	ganv_canvas_w2c(canvas, x2, y2, &cx2, &cy2);
+	ganv_canvas_request_redraw_c(canvas, cx1, cy1, cx2, cy2);
+}
+
+void
+ganv_canvas_w2c_affine(GanvCanvas* canvas, cairo_matrix_t* matrix)
+{
+	g_return_if_fail(GANV_IS_CANVAS(canvas));
+	g_return_if_fail(matrix != NULL);
+
+	cairo_matrix_init_translate(matrix,
+	                            -canvas->impl->scroll_x1,
+	                            -canvas->impl->scroll_y1);
+
+	cairo_matrix_scale(matrix,
+	                   canvas->impl->pixels_per_unit,
+	                   canvas->impl->pixels_per_unit);
+}
+
+void
+ganv_canvas_w2c(GanvCanvas* canvas, double wx, double wy, int* cx, int* cy)
+{
+	g_return_if_fail(GANV_IS_CANVAS(canvas));
+
+	cairo_matrix_t matrix;
+	ganv_canvas_w2c_affine(canvas, &matrix);
+
+	cairo_matrix_transform_point(&matrix, &wx, &wy);
+
+	if (cx) {
+		*cx = floor(wx + 0.5);
+	}
+	if (cy) {
+		*cy = floor(wy + 0.5);
+	}
+}
+
+void
+ganv_canvas_w2c_d(GanvCanvas* canvas, double wx, double wy, double* cx, double* cy)
+{
+	g_return_if_fail(GANV_IS_CANVAS(canvas));
+
+	cairo_matrix_t matrix;
+	ganv_canvas_w2c_affine(canvas, &matrix);
+
+	cairo_matrix_transform_point(&matrix, &wx, &wy);
+
+	if (cx) {
+		*cx = wx;
+	}
+	if (cy) {
+		*cy = wy;
+	}
+}
+
+void
+ganv_canvas_c2w(GanvCanvas* canvas, int cx, int cy, double* wx, double* wy)
+{
+	g_return_if_fail(GANV_IS_CANVAS(canvas));
+
+	cairo_matrix_t matrix;
+	ganv_canvas_w2c_affine(canvas, &matrix);
+	cairo_matrix_invert(&matrix);
+
+	double x = cx;
+	double y = cy;
+	cairo_matrix_transform_point(&matrix, &x, &y);
+
+	if (wx) {
+		*wx = x;
+	}
+	if (wy) {
+		*wy = y;
+	}
+}
+
+void
+ganv_canvas_window_to_world(GanvCanvas* canvas, double winx, double winy,
+                            double* worldx, double* worldy)
+{
+	g_return_if_fail(GANV_IS_CANVAS(canvas));
+
+	if (worldx) {
+		*worldx = canvas->impl->scroll_x1 + ((winx - canvas->impl->zoom_xofs)
+		                                     / canvas->impl->pixels_per_unit);
+	}
+
+	if (worldy) {
+		*worldy = canvas->impl->scroll_y1 + ((winy - canvas->impl->zoom_yofs)
+		                                     / canvas->impl->pixels_per_unit);
+	}
+}
+
+void
+ganv_canvas_world_to_window(GanvCanvas* canvas, double worldx, double worldy,
+                            double* winx, double* winy)
+{
+	g_return_if_fail(GANV_IS_CANVAS(canvas));
+
+	if (winx) {
+		*winx = (canvas->impl->pixels_per_unit) * (worldx - canvas->impl->scroll_x1) + canvas->impl->zoom_xofs;
+	}
+
+	if (winy) {
+		*winy = (canvas->impl->pixels_per_unit) * (worldy - canvas->impl->scroll_y1) + canvas->impl->zoom_yofs;
+	}
+}
+
+void
+ganv_canvas_set_port_order(GanvCanvas*       canvas,
+                           GanvPortOrderFunc port_cmp,
+                           void*             data)
+{
+	g_return_if_fail(GANV_IS_CANVAS(canvas));
+
+	canvas->impl->_port_order.port_cmp = port_cmp;
+	canvas->impl->_port_order.data     = data;
+}
+
+PortOrderCtx
+ganv_canvas_get_port_order(GanvCanvas* canvas)
+{
+	return canvas->impl->_port_order;
+}
+
+gboolean
+ganv_canvas_exporting(GanvCanvas* canvas)
+{
+	return canvas->impl->exporting;
+}
+
+} // extern "C"
diff --git a/src/Port.cpp b/src/Port.cpp
new file mode 100644
index 0000000..3f0d02b
--- /dev/null
+++ b/src/Port.cpp
@@ -0,0 +1,57 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <string>
+
+#include <glib.h>
+
+#include "ganv/Canvas.hpp"
+#include "ganv/Module.hpp"
+#include "ganv/Port.hpp"
+
+#include "./color.h"
+
+namespace Ganv {
+
+static void
+on_value_changed(GanvPort* port, double value, void* portmm)
+{
+	((Port*)portmm)->signal_value_changed.emit(value);
+}
+
+/* Construct a Port on an existing module. */
+Port::Port(Module&            module,
+           const std::string& name,
+           bool               is_input,
+           uint32_t           color)
+	: Box(module.canvas(),
+	      GANV_BOX(ganv_port_new(module.gobj(), is_input,
+	                             "fill-color", color,
+	                             "border-color", PORT_BORDER_COLOR(color),
+	                             "border-width", 2.0,
+	                             "label", name.c_str(),
+	                             NULL)))
+{
+	g_signal_connect(gobj(), "value-changed",
+	                 G_CALLBACK(on_value_changed), this);
+}
+
+Module*
+Port::get_module() const
+{
+	return Glib::wrap(ganv_port_get_module(gobj()));
+}
+
+} // namespace Ganv
diff --git a/src/boilerplate.h b/src/boilerplate.h
new file mode 100644
index 0000000..a419711
--- /dev/null
+++ b/src/boilerplate.h
@@ -0,0 +1,43 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2016 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+typedef gpointer gobject;
+
+/**
+   A case in a switch statement in a set_properties implementation.
+   @prop: Property enumeration ID.
+   @type: Name of the value type, e.g. uint for guint.
+   @field: Field to set to the new value.
+*/
+#define SET_CASE(prop, type, field) \
+	case PROP_##prop: { \
+		const g##type tmp = g_value_get_##type(value); \
+		if ((field) != tmp) { \
+			(field) = tmp; \
+			ganv_item_request_update(GANV_ITEM(object)); \
+		} \
+		break; \
+	}
+
+/**
+   A case in a switch statement in a get_properties implementation.
+   @prop: Property enumeration ID.
+   @type: Name of the value type, e.g. uint for guint.
+   @field: Field to set to the new value.
+*/
+#define GET_CASE(prop, type, field) \
+	case PROP_##prop: \
+	g_value_set_##type(value, field); \
+	break;
diff --git a/src/box.c b/src/box.c
new file mode 100644
index 0000000..e7ecac8
--- /dev/null
+++ b/src/box.c
@@ -0,0 +1,561 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <math.h>
+#include <string.h>
+
+#include <cairo.h>
+
+#include "ganv/box.h"
+
+#include "./boilerplate.h"
+#include "./color.h"
+#include "./gettext.h"
+#include "./ganv-private.h"
+
+static const double STACKED_OFFSET = 4.0;
+
+G_DEFINE_TYPE_WITH_CODE(GanvBox, ganv_box, GANV_TYPE_NODE,
+                        G_ADD_PRIVATE(GanvBox))
+
+static GanvNodeClass* parent_class;
+
+enum {
+	PROP_0,
+	PROP_X1,
+	PROP_Y1,
+	PROP_X2,
+	PROP_Y2,
+	PROP_RADIUS_TL,
+	PROP_RADIUS_TR,
+	PROP_RADIUS_BR,
+	PROP_RADIUS_BL,
+	PROP_STACKED,
+	PROP_BEVELED
+};
+
+static void
+ganv_box_init(GanvBox* box)
+{
+	box->impl = ganv_box_get_instance_private(box);
+
+	memset(&box->impl->coords, '\0', sizeof(GanvBoxCoords));
+
+	box->impl->coords.border_width = GANV_NODE(box)->impl->border_width;
+	box->impl->old_coords          = box->impl->coords;
+	box->impl->radius_tl           = 0.0;
+	box->impl->radius_tr           = 0.0;
+	box->impl->radius_br           = 0.0;
+	box->impl->radius_bl           = 0.0;
+	box->impl->beveled             = FALSE;
+}
+
+static void
+ganv_box_destroy(GtkObject* object)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_BOX(object));
+
+	if (GTK_OBJECT_CLASS(parent_class)->destroy) {
+		(*GTK_OBJECT_CLASS(parent_class)->destroy)(object);
+	}
+}
+
+static void
+ganv_box_set_property(GObject*      object,
+                      guint         prop_id,
+                      const GValue* value,
+                      GParamSpec*   pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_BOX(object));
+
+	GanvBox*        box    = GANV_BOX(object);
+	GanvBoxPrivate* impl   = box->impl;
+	GanvBoxCoords*  coords = &impl->coords;
+
+	switch (prop_id) {
+		SET_CASE(X1, double, coords->x1);
+		SET_CASE(Y1, double, coords->y1);
+		SET_CASE(X2, double, coords->x2);
+		SET_CASE(Y2, double, coords->y2);
+		SET_CASE(RADIUS_TL, double, impl->radius_tl);
+		SET_CASE(RADIUS_TR, double, impl->radius_tr);
+		SET_CASE(RADIUS_BR, double, impl->radius_br);
+		SET_CASE(RADIUS_BL, double, impl->radius_bl);
+		SET_CASE(STACKED, boolean, coords->stacked);
+		SET_CASE(BEVELED, boolean, impl->beveled);
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_box_get_property(GObject*    object,
+                      guint       prop_id,
+                      GValue*     value,
+                      GParamSpec* pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_BOX(object));
+
+	GanvBox*        box    = GANV_BOX(object);
+	GanvBoxPrivate* impl   = box->impl;
+	GanvBoxCoords*  coords = &impl->coords;
+
+	switch (prop_id) {
+		GET_CASE(X1, double, coords->x1);
+		GET_CASE(X2, double, coords->x2);
+		GET_CASE(Y1, double, coords->y1);
+		GET_CASE(Y2, double, coords->y2);
+		GET_CASE(RADIUS_TL, double, impl->radius_tl);
+		GET_CASE(RADIUS_TR, double, impl->radius_tr);
+		GET_CASE(RADIUS_BR, double, impl->radius_br);
+		GET_CASE(RADIUS_BL, double, impl->radius_bl);
+		GET_CASE(STACKED, boolean, impl->coords.stacked);
+		GET_CASE(BEVELED, boolean, impl->beveled);
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_box_bounds_item(const GanvBoxCoords* coords,
+                     double* x1, double* y1,
+                     double* x2, double* y2)
+{
+	*x1 = coords->x1 - coords->border_width;
+	*y1 = coords->y1 - coords->border_width;
+	*x2 = coords->x2 + coords->border_width + (coords->stacked * STACKED_OFFSET);
+	*y2 = coords->y2 + coords->border_width + (coords->stacked * STACKED_OFFSET);
+}
+
+void
+ganv_box_request_redraw(GanvItem*            item,
+                        const GanvBoxCoords* coords,
+                        gboolean             world)
+{
+	double x1, y1, x2, y2;
+	ganv_box_bounds_item(coords, &x1, &y1, &x2, &y2);
+
+	if (!world) {
+		// Convert from item-relative coordinates to world coordinates
+		ganv_item_i2w_pair(item, &x1, &y1, &x2, &y2);
+	}
+
+	ganv_canvas_request_redraw_w(item->impl->canvas, x1, y1, x2, y2);
+}
+
+static void
+coords_i2w(GanvItem* item, GanvBoxCoords* coords)
+{
+	ganv_item_i2w_pair(item, &coords->x1, &coords->y1, &coords->x2, &coords->y2);
+}
+
+static void
+ganv_box_bounds(GanvItem* item,
+                double* x1, double* y1,
+                double* x2, double* y2)
+{
+	// Note this will not be correct if children are outside the box bounds
+	GanvBox* box = (GanvBox*)item;
+	ganv_box_bounds_item(&box->impl->coords, x1, y1, x2, y2);
+}
+
+static void
+ganv_box_update(GanvItem* item, int flags)
+{
+	GanvBox*        box  = GANV_BOX(item);
+	GanvBoxPrivate* impl = box->impl;
+	impl->coords.border_width = box->node.impl->border_width;
+
+	// Request redraw of old location
+	ganv_box_request_redraw(item, &impl->old_coords, TRUE);
+
+	// Store old coordinates in world relative coordinates in case the
+	// group we are in moves between now and the next update
+	impl->old_coords = impl->coords;
+	coords_i2w(item, &impl->old_coords);
+
+	// Call parent class update method, resizing if necessary
+	GANV_ITEM_CLASS(parent_class)->update(item, flags);
+	ganv_box_normalize(box);
+
+	// Update world-relative bounding box
+	ganv_box_bounds(item, &item->impl->x1, &item->impl->y1, &item->impl->x2, &item->impl->y2);
+	ganv_item_i2w_pair(item, &item->impl->x1, &item->impl->y1, &item->impl->x2, &item->impl->y2);
+
+	// Request redraw of new location
+	ganv_box_request_redraw(item, &impl->coords, FALSE);
+}
+
+void
+ganv_box_path(GanvBox* box,
+              cairo_t* cr, double x1, double y1, double x2, double y2,
+              double dr)
+{
+	static const double degrees = G_PI / 180.0;
+
+	GanvBoxPrivate* impl = box->impl;
+
+	if (impl->radius_tl == 0.0 && impl->radius_tr == 0.0
+	    && impl->radius_br == 0.0 && impl->radius_bl == 0.0) {
+		// Simple rectangle
+		cairo_rectangle(cr, x1, y1, x2 - x1, y2 - y1);
+	} else if (impl->beveled) {
+		// Beveled rectangle
+		cairo_new_sub_path(cr);
+		cairo_move_to(cr, x1 + impl->radius_tl, y1);
+		cairo_line_to(cr, x2 - impl->radius_tr, y1);
+		cairo_line_to(cr, x2,                   y1 + impl->radius_tr);
+		cairo_line_to(cr, x2,                   y2 - impl->radius_br);
+		cairo_line_to(cr, x2 - impl->radius_br, y2);
+		cairo_line_to(cr, x1 + impl->radius_bl, y2);
+		cairo_line_to(cr, x1,                   y2 - impl->radius_bl);
+		cairo_line_to(cr, x1,                   y2 - impl->radius_bl);
+		cairo_line_to(cr, x1,                   y1 + impl->radius_tl);
+		cairo_close_path(cr);
+	} else {
+		// Rounded rectangle
+		cairo_new_sub_path(cr);
+		cairo_arc(cr,
+		          x2 - impl->radius_tr - dr,
+		          y1 + impl->radius_tr + dr,
+		          impl->radius_tr + dr, -90 * degrees, 0 * degrees);
+		cairo_arc(cr,
+		          x2 - impl->radius_br - dr, y2 - impl->radius_br - dr,
+		          impl->radius_br + dr, 0 * degrees, 90 * degrees);
+		cairo_arc(cr,
+		          x1 + impl->radius_bl + dr, y2 - impl->radius_bl - dr,
+		          impl->radius_bl + dr, 90 * degrees, 180 * degrees);
+		cairo_arc(cr,
+		          x1 + impl->radius_tl + dr, y1 + impl->radius_tl + dr,
+		          impl->radius_tl + dr, 180 * degrees, 270 * degrees);
+		cairo_close_path(cr);
+	}
+}
+
+static void
+ganv_box_draw(GanvItem* item,
+              cairo_t* cr, double cx, double cy, double cw, double ch)
+{
+	GanvBox*        box  = GANV_BOX(item);
+	GanvBoxPrivate* impl = box->impl;
+
+	double x1 = impl->coords.x1;
+	double y1 = impl->coords.y1;
+	double x2 = impl->coords.x2;
+	double y2 = impl->coords.y2;
+	ganv_item_i2w_pair(item, &x1, &y1, &x2, &y2);
+
+	double dash_length, border_color, fill_color;
+	ganv_node_get_draw_properties(
+		&box->node, &dash_length, &border_color, &fill_color);
+
+	double r, g, b, a;
+
+	for (int i = (impl->coords.stacked ? 1 : 0); i >= 0; --i) {
+		const double x = 0.0 - (STACKED_OFFSET * i);
+		const double y = 0.0 - (STACKED_OFFSET * i);
+
+		// Trace basic box path
+		ganv_box_path(box, cr, x1 - x, y1 - y, x2 - x, y2 - y, 0.0);
+
+		// Fill
+		color_to_rgba(fill_color, &r, &g, &b, &a);
+		cairo_set_source_rgba(cr, r, g, b, a);
+
+		// Border
+		if (impl->coords.border_width > 0.0) {
+			cairo_fill_preserve(cr);
+			color_to_rgba(border_color, &r, &g, &b, &a);
+			cairo_set_source_rgba(cr, r, g, b, a);
+			cairo_set_line_width(cr, impl->coords.border_width);
+			if (dash_length > 0) {
+				cairo_set_dash(cr, &dash_length, 1, box->node.impl->dash_offset);
+			} else {
+				cairo_set_dash(cr, &dash_length, 0, 0);
+			}
+			cairo_stroke(cr);
+		} else {
+			cairo_fill(cr);
+		}
+	}
+
+	GanvItemClass* item_class = GANV_ITEM_CLASS(parent_class);
+	item_class->draw(item, cr, cx, cy, cw, ch);
+}
+
+static double
+ganv_box_point(GanvItem* item, double x, double y, GanvItem** actual_item)
+{
+	GanvBox*        box  = GANV_BOX(item);
+	GanvBoxPrivate* impl = box->impl;
+
+	*actual_item = NULL;
+
+	double x1, y1, x2, y2;
+	ganv_box_bounds_item(&impl->coords, &x1, &y1, &x2, &y2);
+
+	// Point is inside the box (distance 0)
+	if ((x >= x1) && (y >= y1) && (x <= x2) && (y <= y2)) {
+		*actual_item = item;
+		return 0.0;
+	}
+
+	// Point is outside the box
+	double dx = 0.0;
+	double dy = 0.0;
+
+	// Find horizontal distance to nearest edge
+	if (x < x1) {
+		dx = x1 - x;
+	} else if (x > x2) {
+		dx = x - x2;
+	}
+
+	// Find vertical distance to nearest edge
+	if (y < y1) {
+		dy = y1 - y;
+	} else if (y > y2) {
+		dy = y - y2;
+	}
+
+	return sqrt((dx * dx) + (dy * dy));
+}
+
+static gboolean
+ganv_box_is_within(const GanvNode* self,
+                   double          x1,
+                   double          y1,
+                   double          x2,
+                   double          y2)
+{
+	double bx1, by1, bx2, by2;
+	g_object_get(G_OBJECT(self),
+	             "x1", &bx1,
+	             "y1", &by1,
+	             "x2", &bx2,
+	             "y2", &by2,
+	             NULL);
+
+	ganv_item_i2w_pair(GANV_ITEM(self), &bx1, &by1, &bx2, &by2);
+
+	return (   bx1 >= x1
+	           && by2 >= y1
+	           && bx2 <= x2
+	           && by2 <= y2);
+}
+
+static void
+ganv_box_default_set_width(GanvBox* box, double width)
+{
+	box->impl->coords.x2 = ganv_box_get_x1(box) + width;
+	ganv_item_request_update(GANV_ITEM(box));
+}
+
+static void
+ganv_box_default_set_height(GanvBox* box, double height)
+{
+	box->impl->coords.y2 = ganv_box_get_y1(box) + height;
+	ganv_item_request_update(GANV_ITEM(box));
+}
+
+static void
+ganv_box_class_init(GanvBoxClass* klass)
+{
+	GObjectClass*   gobject_class = (GObjectClass*)klass;
+	GtkObjectClass* object_class  = (GtkObjectClass*)klass;
+	GanvItemClass*  item_class    = (GanvItemClass*)klass;
+	GanvNodeClass*  node_class    = (GanvNodeClass*)klass;
+
+	parent_class = GANV_NODE_CLASS(g_type_class_peek_parent(klass));
+
+	gobject_class->set_property = ganv_box_set_property;
+	gobject_class->get_property = ganv_box_get_property;
+
+	g_object_class_install_property(
+		gobject_class, PROP_X1, g_param_spec_double(
+			"x1",
+			_("x1"),
+			_("Top left x coordinate."),
+			-G_MAXDOUBLE, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_Y1, g_param_spec_double(
+			"y1",
+			_("y1"),
+			_("Top left y coordinate."),
+			-G_MAXDOUBLE, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_X2, g_param_spec_double(
+			"x2",
+			_("x2"),
+			_("Bottom right x coordinate."),
+			-G_MAXDOUBLE, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_Y2, g_param_spec_double(
+			"y2",
+			_("y2"),
+			_("Bottom right y coordinate."),
+			-G_MAXDOUBLE, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_RADIUS_TL, g_param_spec_double(
+			"radius-tl",
+			_("Top left radius"),
+			_("The radius of the top left corner."),
+			0.0, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_RADIUS_TR, g_param_spec_double(
+			"radius-tr",
+			_("Top right radius"),
+			_("The radius of the top right corner."),
+			0.0, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_RADIUS_BR, g_param_spec_double(
+			"radius-br",
+			_("Bottom right radius"),
+			_("The radius of the bottom right corner."),
+			0.0, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_RADIUS_BL, g_param_spec_double(
+			"radius-bl",
+			_("Bottom left radius"),
+			_("The radius of the bottom left corner."),
+			0.0, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_STACKED, g_param_spec_boolean(
+			"stacked",
+			_("Stacked"),
+			_("Show box with a stacked appearance."),
+			FALSE,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_BEVELED, g_param_spec_boolean(
+			"beveled",
+			_("Beveled"),
+			_("Show radiused corners with a sharp bevel."),
+			FALSE,
+			G_PARAM_READWRITE));
+
+	object_class->destroy = ganv_box_destroy;
+
+	item_class->update = ganv_box_update;
+	item_class->bounds = ganv_box_bounds;
+	item_class->point  = ganv_box_point;
+	item_class->draw   = ganv_box_draw;
+
+	node_class->is_within = ganv_box_is_within;
+
+	klass->set_width  = ganv_box_default_set_width;
+	klass->set_height = ganv_box_default_set_height;
+}
+
+void
+ganv_box_normalize(GanvBox* box)
+{
+	if (box->impl->coords.x2 < box->impl->coords.x1) {
+		const double tmp = box->impl->coords.x1;
+		box->impl->coords.x1 = box->impl->coords.x2;
+		box->impl->coords.x2 = tmp;
+	}
+	if (box->impl->coords.y2 < box->impl->coords.y1) {
+		const double tmp = box->impl->coords.y1;
+		box->impl->coords.y1 = box->impl->coords.y2;
+		box->impl->coords.y2 = tmp;
+	}
+}
+
+double
+ganv_box_get_x1(const GanvBox* box)
+{
+	return box->impl->coords.x1;
+}
+
+double
+ganv_box_get_y1(const GanvBox* box)
+{
+	return box->impl->coords.y1;
+}
+
+double
+ganv_box_get_x2(const GanvBox* box)
+{
+	return box->impl->coords.x2;
+}
+
+double
+ganv_box_get_y2(const GanvBox* box)
+{
+	return box->impl->coords.y2;
+}
+
+double
+ganv_box_get_width(const GanvBox* box)
+{
+	return box->impl->coords.x2 - box->impl->coords.x1;
+}
+
+void
+ganv_box_set_width(GanvBox* box,
+                   double   width)
+{
+	GANV_BOX_GET_CLASS(box)->set_width(box, width);
+}
+
+double
+ganv_box_get_height(const GanvBox* box)
+{
+	return box->impl->coords.y2 - box->impl->coords.y1;
+}
+
+void
+ganv_box_set_height(GanvBox* box,
+                    double   height)
+{
+	GANV_BOX_GET_CLASS(box)->set_height(box, height);
+}
+
+double
+ganv_box_get_border_width(const GanvBox* box)
+{
+	return box->impl->coords.border_width;
+}
diff --git a/src/circle.c b/src/circle.c
new file mode 100644
index 0000000..a69c207
--- /dev/null
+++ b/src/circle.c
@@ -0,0 +1,467 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <math.h>
+#include <string.h>
+
+#include "ganv/canvas.h"
+#include "ganv/circle.h"
+
+#include "./color.h"
+#include "./boilerplate.h"
+#include "./gettext.h"
+#include "./ganv-private.h"
+
+G_DEFINE_TYPE_WITH_CODE(GanvCircle, ganv_circle, GANV_TYPE_NODE,
+                        G_ADD_PRIVATE(GanvCircle))
+
+static GanvNodeClass* parent_class;
+
+enum {
+	PROP_0,
+	PROP_RADIUS,
+	PROP_RADIUS_EMS,
+	PROP_FIT_LABEL
+};
+
+static void
+ganv_circle_init(GanvCircle* circle)
+{
+	circle->impl = ganv_circle_get_instance_private(circle);
+
+	memset(&circle->impl->coords, '\0', sizeof(GanvCircleCoords));
+	circle->impl->coords.radius     = 0.0;
+	circle->impl->coords.radius_ems = 1.0;
+	circle->impl->coords.width      = 2.0;
+	circle->impl->old_coords        = circle->impl->coords;
+	circle->impl->fit_label         = TRUE;
+}
+
+static void
+ganv_circle_destroy(GtkObject* object)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_CIRCLE(object));
+
+	if (GTK_OBJECT_CLASS(parent_class)->destroy) {
+		(*GTK_OBJECT_CLASS(parent_class)->destroy)(object);
+	}
+}
+
+static void
+ganv_circle_set_property(GObject*      object,
+                         guint         prop_id,
+                         const GValue* value,
+                         GParamSpec*   pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_CIRCLE(object));
+
+	GanvCircle* circle = GANV_CIRCLE(object);
+
+	switch (prop_id) {
+		SET_CASE(RADIUS, double, circle->impl->coords.radius);
+		SET_CASE(RADIUS_EMS, double, circle->impl->coords.radius_ems);
+		SET_CASE(FIT_LABEL, boolean, circle->impl->fit_label);
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+
+	if (prop_id == PROP_RADIUS_EMS) {
+		ganv_circle_set_radius_ems(circle, circle->impl->coords.radius_ems);
+	}
+}
+
+static void
+ganv_circle_get_property(GObject*    object,
+                         guint       prop_id,
+                         GValue*     value,
+                         GParamSpec* pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_CIRCLE(object));
+
+	GanvCircle* circle = GANV_CIRCLE(object);
+
+	switch (prop_id) {
+		GET_CASE(RADIUS, double, circle->impl->coords.radius);
+		GET_CASE(RADIUS_EMS, double, circle->impl->coords.radius_ems);
+		GET_CASE(FIT_LABEL, boolean, circle->impl->fit_label);
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_circle_resize(GanvNode* self)
+{
+	GanvNode*   node   = GANV_NODE(self);
+	GanvCircle* circle = GANV_CIRCLE(self);
+	GanvCanvas* canvas = GANV_CANVAS(GANV_ITEM(node)->impl->canvas);
+
+	if (node->impl->label) {
+		if (node->impl->label->impl->needs_layout) {
+			ganv_text_layout(node->impl->label);
+		}
+
+		const double label_w = node->impl->label->impl->coords.width;
+		const double label_h = node->impl->label->impl->coords.height;
+		if (circle->impl->fit_label) {
+			// Resize to fit text
+			const double radius = MAX(label_w, label_h) / 2.0 + 3.0;
+			if (radius != circle->impl->coords.radius) {
+				ganv_item_set(GANV_ITEM(self),
+				              "radius", radius,
+				              NULL);
+			}
+		}
+
+		// Center label
+		ganv_item_set(GANV_ITEM(node->impl->label),
+		              "x", label_w / -2.0,
+		              "y", label_h / -2.0,
+		              NULL);
+	}
+
+	if (parent_class->resize) {
+		parent_class->resize(self);
+	}
+
+	ganv_canvas_for_each_edge_on(
+		canvas, node, (GanvEdgeFunc)ganv_edge_update_location, NULL);
+}
+
+static void
+ganv_circle_redraw_text(GanvNode* self)
+{
+	GanvCircle* circle = GANV_CIRCLE(self);
+	if (circle->impl->coords.radius_ems) {
+		ganv_circle_set_radius_ems(circle, circle->impl->coords.radius_ems);
+	}
+
+	if (parent_class->redraw_text) {
+		parent_class->redraw_text(self);
+	}
+}
+
+static gboolean
+ganv_circle_is_within(const GanvNode* self,
+                      double          x1,
+                      double          y1,
+                      double          x2,
+                      double          y2)
+{
+	const double x = GANV_ITEM(self)->impl->x;
+	const double y = GANV_ITEM(self)->impl->y;
+
+	return x >= x1
+		&& x <= x2
+		&& y >= y1
+		&& y <= y2;
+}
+
+static void
+ganv_circle_vector(const GanvNode* self,
+                   const GanvNode* other,
+                   double*         x,
+                   double*         y,
+                   double*         dx,
+                   double*         dy)
+{
+	GanvCircle* circle = GANV_CIRCLE(self);
+
+	const double cx      = GANV_ITEM(self)->impl->x;
+	const double cy      = GANV_ITEM(self)->impl->y;
+	const double other_x = GANV_ITEM(other)->impl->x;
+	const double other_y = GANV_ITEM(other)->impl->y;
+
+	const double border  = circle->node.impl->border_width;
+	const double xdist = other_x - cx;
+	const double ydist = other_y - cy;
+	const double h     = sqrt((xdist * xdist) + (ydist * ydist));
+	const double theta = asin(xdist / (h + DBL_EPSILON));
+	const double y_mod = (cy < other_y) ? 1 : -1;
+	const double ret_h = h - circle->impl->coords.radius - border / 2.0;
+	const double ret_x = other_x - sin(theta) * ret_h;
+	const double ret_y = other_y - cos(theta) * ret_h * y_mod;
+
+	*x  = ret_x;
+	*y  = ret_y;
+	*dx = 0.0;
+	*dy = 0.0;
+
+	ganv_item_i2w(GANV_ITEM(circle)->impl->parent, x, y);
+}
+
+static void
+request_redraw(GanvItem*               item,
+               const GanvCircleCoords* coords,
+               gboolean                world)
+{
+	const double w = coords->width;
+
+	double x1 = coords->x - coords->radius - w;
+	double y1 = coords->y - coords->radius - w;
+	double x2 = coords->x + coords->radius + w;
+	double y2 = coords->y + coords->radius + w;
+
+	if (!world) {
+		// Convert from parent-relative coordinates to world coordinates
+		ganv_item_i2w_pair(item, &x1, &y1, &x2, &y2);
+	}
+
+	ganv_canvas_request_redraw_w(item->impl->canvas, x1, y1, x2, y2);
+}
+
+static void
+coords_i2w(GanvItem* item, GanvCircleCoords* coords)
+{
+	ganv_item_i2w(item, &coords->x, &coords->y);
+}
+
+static void
+ganv_circle_bounds_item(GanvItem* item,
+                        double* x1, double* y1,
+                        double* x2, double* y2)
+{
+	const GanvCircle*       circle = GANV_CIRCLE(item);
+	const GanvCircleCoords* coords = &circle->impl->coords;
+	*x1 = coords->x - coords->radius - coords->width;
+	*y1 = coords->y - coords->radius - coords->width;
+	*x2 = coords->x + coords->radius + coords->width;
+	*y2 = coords->y + coords->radius + coords->width;
+}
+
+static void
+ganv_circle_bounds(GanvItem* item,
+                   double* x1, double* y1,
+                   double* x2, double* y2)
+{
+	ganv_circle_bounds_item(item, x1, y1, x2, y2);
+}
+
+static void
+ganv_circle_update(GanvItem* item, int flags)
+{
+	GanvCircle*        circle = GANV_CIRCLE(item);
+	GanvCirclePrivate* impl   = circle->impl;
+	impl->coords.width = circle->node.impl->border_width;
+
+	// Request redraw of old location
+	request_redraw(item, &impl->old_coords, TRUE);
+
+	// Store old coordinates in world relative coordinates in case the
+	// group we are in moves between now and the next update
+	impl->old_coords = impl->coords;
+	coords_i2w(item, &impl->old_coords);
+
+	// Update world-relative bounding box
+	ganv_circle_bounds(item, &item->impl->x1, &item->impl->y1, &item->impl->x2, &item->impl->y2);
+	ganv_item_i2w_pair(item, &item->impl->x1, &item->impl->y1, &item->impl->x2, &item->impl->y2);
+
+	// Request redraw of new location
+	request_redraw(item, &impl->coords, FALSE);
+
+	GANV_ITEM_CLASS(parent_class)->update(item, flags);
+}
+
+static void
+ganv_circle_draw(GanvItem* item,
+                 cairo_t* cr, double cx, double cy, double cw, double ch)
+{
+	GanvNode*          node   = GANV_NODE(item);
+	GanvCircle*        circle = GANV_CIRCLE(item);
+	GanvCirclePrivate* impl   = circle->impl;
+
+	double r, g, b, a;
+
+	double x = impl->coords.x;
+	double y = impl->coords.y;
+	ganv_item_i2w(item, &x, &y);
+
+	double dash_length, border_color, fill_color;
+	ganv_node_get_draw_properties(
+		&circle->node, &dash_length, &border_color, &fill_color);
+
+	// Fill
+	cairo_new_path(cr);
+	cairo_arc(cr,
+	          x,
+	          y,
+	          impl->coords.radius + (impl->coords.width / 2.0),
+	          0, 2 * G_PI);
+	color_to_rgba(fill_color, &r, &g, &b, &a);
+	cairo_set_source_rgba(cr, r, g, b, a);
+	cairo_fill(cr);
+
+	// Border
+	cairo_arc(cr,
+	          x,
+	          y,
+	          impl->coords.radius,
+	          0, 2 * G_PI);
+	color_to_rgba(border_color, &r, &g, &b, &a);
+	cairo_set_source_rgba(cr, r, g, b, a);
+	cairo_set_line_width(cr, impl->coords.width);
+	if (dash_length > 0) {
+		cairo_set_dash(cr, &dash_length, 1, circle->node.impl->dash_offset);
+	} else {
+		cairo_set_dash(cr, &dash_length, 0, 0);
+	}
+	cairo_stroke(cr);
+
+	// Draw label
+	if (node->impl->label) {
+		GanvItem* label_item = GANV_ITEM(node->impl->label);
+
+		if (label_item->object.flags & GANV_ITEM_VISIBLE) {
+			GANV_ITEM_GET_CLASS(label_item)->draw(
+				label_item, cr, cx, cy, cw, ch);
+		}
+	}
+}
+
+static double
+ganv_circle_point(GanvItem* item, double x, double y, GanvItem** actual_item)
+{
+	const GanvCircle*       circle = GANV_CIRCLE(item);
+	const GanvCircleCoords* coords = &circle->impl->coords;
+
+	*actual_item = item;
+
+	const double dx = fabs(x - coords->x);
+	const double dy = fabs(y - coords->y);
+	const double d  = sqrt((dx * dx) + (dy * dy));
+
+	if (d <= coords->radius + coords->width) {
+		// Point is inside the circle
+		return 0.0;
+	} else {
+		// Distance from the edge of the circle
+		return d - (coords->radius + coords->width);
+	}
+}
+
+static void
+ganv_circle_class_init(GanvCircleClass* klass)
+{
+	GObjectClass*   gobject_class = (GObjectClass*)klass;
+	GtkObjectClass* object_class  = (GtkObjectClass*)klass;
+	GanvItemClass*  item_class    = (GanvItemClass*)klass;
+	GanvNodeClass*  node_class    = (GanvNodeClass*)klass;
+
+	parent_class = GANV_NODE_CLASS(g_type_class_peek_parent(klass));
+
+	gobject_class->set_property = ganv_circle_set_property;
+	gobject_class->get_property = ganv_circle_get_property;
+
+	g_object_class_install_property(
+		gobject_class, PROP_RADIUS, g_param_spec_double(
+			"radius",
+			_("Radius"),
+			_("The radius of the circle."),
+			0, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_RADIUS_EMS, g_param_spec_double(
+			"radius-ems",
+			_("Radius in ems"),
+			_("The radius of the circle in ems."),
+			0, G_MAXDOUBLE,
+			1.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_FIT_LABEL, g_param_spec_boolean(
+			"fit-label",
+			_("Fit label"),
+			_("If true, expand circle to fit its label"),
+			TRUE,
+			(GParamFlags)G_PARAM_READWRITE));
+
+	object_class->destroy = ganv_circle_destroy;
+
+	node_class->resize      = ganv_circle_resize;
+	node_class->is_within   = ganv_circle_is_within;
+	node_class->tail_vector = ganv_circle_vector;
+	node_class->head_vector = ganv_circle_vector;
+	node_class->redraw_text = ganv_circle_redraw_text;
+
+	item_class->update = ganv_circle_update;
+	item_class->bounds = ganv_circle_bounds;
+	item_class->point  = ganv_circle_point;
+	item_class->draw   = ganv_circle_draw;
+}
+
+GanvCircle*
+ganv_circle_new(GanvCanvas* canvas,
+                const char* first_property_name, ...)
+{
+	GanvCircle* circle = GANV_CIRCLE(
+		g_object_new(ganv_circle_get_type(), "canvas", canvas, NULL));
+
+	va_list args;
+	va_start(args, first_property_name);
+	g_object_set_valist(G_OBJECT(circle), first_property_name, args);
+	va_end(args);
+
+	return circle;
+}
+
+double
+ganv_circle_get_radius(const GanvCircle* circle)
+{
+	return circle->impl->coords.radius;
+}
+
+void
+ganv_circle_set_radius(GanvCircle* circle, double radius)
+{
+	circle->impl->coords.radius = radius;
+	ganv_item_request_update(GANV_ITEM(circle));
+}
+
+double
+ganv_circle_get_radius_ems(const GanvCircle* circle)
+{
+	return circle->impl->coords.radius_ems;
+}
+
+void
+ganv_circle_set_radius_ems(GanvCircle* circle, double ems)
+{
+	GanvCanvas*  canvas = GANV_CANVAS(GANV_ITEM(circle)->impl->canvas);
+	const double points = ganv_canvas_get_font_size(canvas);
+	circle->impl->coords.radius_ems = ems;
+	circle->impl->coords.radius     = points * ems;
+	ganv_item_request_update(GANV_ITEM(circle));
+}
+
+gboolean
+ganv_circle_get_fit_label(const GanvCircle* circle)
+{
+	return circle->impl->fit_label;
+}
+
+void
+ganv_circle_set_fit_label(GanvCircle* circle, gboolean fit_label)
+{
+	circle->impl->fit_label = fit_label;
+	ganv_item_request_update(GANV_ITEM(circle));
+}
diff --git a/src/color.h b/src/color.h
new file mode 100644
index 0000000..ca52d98
--- /dev/null
+++ b/src/color.h
@@ -0,0 +1,63 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_UTIL_H
+#define GANV_UTIL_H
+
+#include <glib.h>
+
+#ifdef GANV_USE_LIGHT_THEME
+#    define DEFAULT_BACKGROUND_COLOR 0xFFFFFFFF
+#    define DEFAULT_TEXT_COLOR       0x000000FF
+#    define DIM_TEXT_COLOR           0x333333BB
+#    define DEFAULT_FILL_COLOR       0xEEEEEEFF
+#    define DEFAULT_BORDER_COLOR     0x000000FF
+#    define PORT_BORDER_COLOR(fill)  0x000000FF
+#    define EDGE_COLOR(base)         highlight_color(tail_color, -48)
+#else
+#    define DEFAULT_BACKGROUND_COLOR 0x000000FF
+#    define DEFAULT_TEXT_COLOR       0xFFFFFFFF
+#    define DIM_TEXT_COLOR           0xCCCCCCBB
+#    define DEFAULT_FILL_COLOR       0x1E2224FF
+#    define DEFAULT_BORDER_COLOR     0x3E4244FF
+#    define PORT_BORDER_COLOR(fill)  highlight_color(fill, 0x20)
+#    define EDGE_COLOR(base)         highlight_color(tail_color, 48)
+#endif
+
+static inline void
+color_to_rgba(guint color, double* r, double* g, double* b, double* a)
+{
+	*r = ((color >> 24) & 0xFF) / 255.0;
+	*g = ((color >> 16) & 0xFF) / 255.0;
+	*b = ((color >> 8)  & 0xFF) / 255.0;
+	*a = ((color)       & 0xFF) / 255.0;
+}
+
+static inline guint
+highlight_color(guint c, guint delta)
+{
+	const guint max_char = 255;
+	const guint r        = MIN((c >> 24) + delta, max_char);
+	const guint g        = MIN(((c >> 16) & 0xFF) + delta, max_char);
+	const guint b        = MIN(((c >> 8) & 0xFF) + delta, max_char);
+	const guint a        = c & 0xFF;
+
+	return ((((guint)(r)) << 24) |
+	        (((guint)(g)) << 16) |
+	        (((guint)(b)) << 8) |
+	        (((guint)(a))));
+}
+
+#endif  // GANV_UTIL_H
diff --git a/src/edge.c b/src/edge.c
new file mode 100644
index 0000000..a22bc73
--- /dev/null
+++ b/src/edge.c
@@ -0,0 +1,786 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2016 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <math.h>
+#include <string.h>
+
+#include <cairo.h>
+
+#include "ganv/canvas.h"
+#include "ganv/edge.h"
+#include "ganv/node.h"
+
+#include "./boilerplate.h"
+#include "./color.h"
+#include "./gettext.h"
+
+#include "color.h"
+#include "ganv-private.h"
+
+#define ARROW_DEPTH   32
+#define ARROW_BREADTH 32
+
+// Uncomment to see control point path as straight lines
+//#define GANV_DEBUG_CURVES 1
+
+// Uncomment along with GANV_DEBUG_CURVES to see bounding box (buggy)
+//#define GANV_DEBUG_BOUNDS 1
+
+enum {
+	PROP_0,
+	PROP_TAIL,
+	PROP_HEAD,
+	PROP_WIDTH,
+	PROP_HANDLE_RADIUS,
+	PROP_DASH_LENGTH,
+	PROP_DASH_OFFSET,
+	PROP_COLOR,
+	PROP_CONSTRAINING,
+	PROP_CURVED,
+	PROP_ARROWHEAD,
+	PROP_SELECTED,
+	PROP_HIGHLIGHTED,
+	PROP_GHOST
+};
+
+G_DEFINE_TYPE_WITH_CODE(GanvEdge, ganv_edge, GANV_TYPE_ITEM,
+                        G_ADD_PRIVATE(GanvEdge))
+
+static GanvItemClass* parent_class;
+
+static void
+ganv_edge_init(GanvEdge* edge)
+{
+	GanvEdgePrivate* impl = ganv_edge_get_instance_private(edge);
+
+	edge->impl = impl;
+
+	impl->tail = NULL;
+	impl->head = NULL;
+
+	memset(&impl->coords, '\0', sizeof(GanvEdgeCoords));
+	impl->coords.width         = 2.0;
+	impl->coords.handle_radius = 4.0;
+	impl->coords.constraining  = TRUE;
+	impl->coords.curved        = FALSE;
+	impl->coords.arrowhead     = FALSE;
+
+	impl->old_coords  = impl->coords;
+	impl->dash_length = 0.0;
+	impl->dash_offset = 0.0;
+	impl->color       = 0;
+}
+
+static void
+ganv_edge_destroy(GtkObject* object)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_EDGE(object));
+
+	GanvEdge*   edge   = GANV_EDGE(object);
+	GanvCanvas* canvas = GANV_CANVAS(edge->item.impl->canvas);
+	if (canvas && !edge->impl->ghost) {
+		edge->item.impl->canvas = NULL;
+	}
+	edge->item.impl->parent = NULL;
+
+	if (GTK_OBJECT_CLASS(parent_class)->destroy) {
+		(*GTK_OBJECT_CLASS(parent_class)->destroy)(object);
+	}
+}
+
+static void
+ganv_edge_set_property(GObject*      object,
+                       guint         prop_id,
+                       const GValue* value,
+                       GParamSpec*   pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_EDGE(object));
+
+	GanvItem*        item   = GANV_ITEM(object);
+	GanvEdge*        edge   = GANV_EDGE(object);
+	GanvEdgePrivate* impl   = edge->impl;
+	GanvEdgeCoords*  coords = &impl->coords;
+
+	switch (prop_id) {
+		SET_CASE(WIDTH, double, coords->width);
+		SET_CASE(HANDLE_RADIUS, double, coords->handle_radius);
+		SET_CASE(DASH_LENGTH, double, impl->dash_length);
+		SET_CASE(DASH_OFFSET, double, impl->dash_offset);
+		SET_CASE(COLOR, uint, impl->color);
+		SET_CASE(CONSTRAINING, boolean, impl->coords.constraining);
+		SET_CASE(CURVED, boolean, impl->coords.curved);
+		SET_CASE(ARROWHEAD, boolean, impl->coords.arrowhead);
+		SET_CASE(SELECTED, boolean, impl->selected);
+		SET_CASE(HIGHLIGHTED, boolean, impl->highlighted);
+		SET_CASE(GHOST, boolean, impl->ghost);
+	case PROP_TAIL: {
+		const gobject tmp = g_value_get_object(value);
+		if (impl->tail != tmp) {
+			impl->tail = GANV_NODE(tmp);
+			ganv_item_request_update(item);
+		}
+		break;
+	}
+	case PROP_HEAD: {
+		const gobject tmp = g_value_get_object(value);
+		if (impl->head != tmp) {
+			impl->head = GANV_NODE(tmp);
+			ganv_item_request_update(item);
+		}
+		break;
+	}
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_edge_get_property(GObject*    object,
+                       guint       prop_id,
+                       GValue*     value,
+                       GParamSpec* pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_EDGE(object));
+
+	GanvEdge*        edge = GANV_EDGE(object);
+	GanvEdgePrivate* impl = edge->impl;
+
+	switch (prop_id) {
+		GET_CASE(TAIL, object, impl->tail);
+		GET_CASE(HEAD, object, impl->head);
+		GET_CASE(WIDTH, double, impl->coords.width);
+		SET_CASE(HANDLE_RADIUS, double, impl->coords.handle_radius);
+		GET_CASE(DASH_LENGTH, double, impl->dash_length);
+		GET_CASE(DASH_OFFSET, double, impl->dash_offset);
+		GET_CASE(COLOR, uint, impl->color);
+		GET_CASE(CONSTRAINING, boolean, impl->coords.constraining);
+		GET_CASE(CURVED, boolean, impl->coords.curved);
+		GET_CASE(ARROWHEAD, boolean, impl->coords.arrowhead);
+		GET_CASE(SELECTED, boolean, impl->selected);
+		GET_CASE(HIGHLIGHTED, boolean, impl->highlighted);
+		SET_CASE(GHOST, boolean, impl->ghost);
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+void
+ganv_edge_request_redraw(GanvItem*             item,
+                         const GanvEdgeCoords* coords)
+{
+	GanvCanvas* canvas = item->impl->canvas;
+	const double w = coords->width;
+	if (coords->curved) {
+		const double src_x  = coords->x1;
+		const double src_y  = coords->y1;
+		const double dst_x  = coords->x2;
+		const double dst_y  = coords->y2;
+		const double join_x = (src_x + dst_x) / 2.0;
+		const double join_y = (src_y + dst_y) / 2.0;
+		const double src_x1 = coords->cx1;
+		const double src_y1 = coords->cy1;
+		const double dst_x1 = coords->cx2;
+		const double dst_y1 = coords->cy2;
+
+		const double r1x1 = MIN(MIN(src_x, join_x), src_x1);
+		const double r1y1 = MIN(MIN(src_y, join_y), src_y1);
+		const double r1x2 = MAX(MAX(src_x, join_x), src_x1);
+		const double r1y2 = MAX(MAX(src_y, join_y), src_y1);
+		ganv_canvas_request_redraw_w(canvas,
+		                             r1x1 - w, r1y1 - w,
+		                             r1x2 + w, r1y2 + w);
+
+		const double r2x1 = MIN(MIN(dst_x, join_x), dst_x1);
+		const double r2y1 = MIN(MIN(dst_y, join_y), dst_y1);
+		const double r2x2 = MAX(MAX(dst_x, join_x), dst_x1);
+		const double r2y2 = MAX(MAX(dst_y, join_y), dst_y1);
+		ganv_canvas_request_redraw_w(canvas,
+		                             r2x1 - w, r2y1 - w,
+		                             r2x2 + w, r2y2 + w);
+
+	} else {
+		const double x1 = MIN(coords->x1, coords->x2);
+		const double y1 = MIN(coords->y1, coords->y2);
+		const double x2 = MAX(coords->x1, coords->x2);
+		const double y2 = MAX(coords->y1, coords->y2);
+
+		ganv_canvas_request_redraw_w(canvas,
+		                             x1 - w, y1 - w,
+		                             x2 + w, y2 + w);
+	}
+
+	if (coords->handle_radius > 0.0) {
+		ganv_canvas_request_redraw_w(
+			canvas,
+			coords->handle_x - coords->handle_radius - w,
+			coords->handle_y - coords->handle_radius - w,
+			coords->handle_x + coords->handle_radius + w,
+			coords->handle_y + coords->handle_radius + w);
+	}
+
+	if (coords->arrowhead) {
+		ganv_canvas_request_redraw_w(
+			canvas,
+			coords->x2 - ARROW_DEPTH,
+			coords->y2 - ARROW_BREADTH,
+			coords->x2 + ARROW_DEPTH,
+			coords->y2 + ARROW_BREADTH);
+	}
+}
+
+static void
+ganv_edge_bounds(GanvItem* item,
+                 double* x1, double* y1,
+                 double* x2, double* y2)
+{
+	GanvEdge*        edge   = GANV_EDGE(item);
+	GanvEdgePrivate* impl   = edge->impl;
+	GanvEdgeCoords*  coords = &impl->coords;
+	const double     w      = coords->width;
+
+	if (coords->curved) {
+		*x1 = MIN(coords->x1, MIN(coords->cx1, MIN(coords->x2, coords->cx2))) - w;
+		*y1 = MIN(coords->y1, MIN(coords->cy1, MIN(coords->y2, coords->cy2))) - w;
+		*x2 = MAX(coords->x1, MAX(coords->cx1, MAX(coords->x2, coords->cx2))) + w;
+		*y2 = MAX(coords->y1, MAX(coords->cy1, MAX(coords->y2, coords->cy2))) + w;
+	} else {
+		*x1 = MIN(impl->coords.x1, impl->coords.x2) - w;
+		*y1 = MIN(impl->coords.y1, impl->coords.y2) - w;
+		*x2 = MAX(impl->coords.x1, impl->coords.x2) + w;
+		*y2 = MAX(impl->coords.y1, impl->coords.y2) + w;
+	}
+}
+
+void
+ganv_edge_get_coords(const GanvEdge* edge, GanvEdgeCoords* coords)
+{
+	GanvEdgePrivate* impl = edge->impl;
+
+	GANV_NODE_GET_CLASS(impl->tail)->tail_vector(
+		impl->tail, impl->head,
+		&coords->x1, &coords->y1, &coords->cx1, &coords->cy1);
+	GANV_NODE_GET_CLASS(impl->head)->head_vector(
+		impl->head, impl->tail,
+		&coords->x2, &coords->y2, &coords->cx2, &coords->cy2);
+
+	const double dx = coords->x2 - coords->x1;
+	const double dy = coords->y2 - coords->y1;
+
+	coords->handle_x = coords->x1 + (dx / 2.0);
+	coords->handle_y = coords->y1 + (dy / 2.0);
+
+	const double abs_dx = fabs(dx);
+	const double abs_dy = fabs(dy);
+
+	coords->cx1 = coords->x1 + (coords->cx1 * (abs_dx / 4.0));
+	coords->cy1 = coords->y1 + (coords->cy1 * (abs_dy / 4.0));
+	coords->cx2 = coords->x2 + (coords->cx2 * (abs_dx / 4.0));
+	coords->cy2 = coords->y2 + (coords->cy2 * (abs_dy / 4.0));
+}
+
+static void
+ganv_edge_update(GanvItem* item, int flags)
+{
+	GanvEdge*        edge = GANV_EDGE(item);
+	GanvEdgePrivate* impl = edge->impl;
+
+	// Request redraw of old location
+	ganv_edge_request_redraw(item, &impl->old_coords);
+
+	// Calculate new coordinates from tail and head
+	ganv_edge_get_coords(edge, &impl->coords);
+
+	// Update old coordinates
+	impl->old_coords = impl->coords;
+
+	// Get bounding box
+	double x1, x2, y1, y2;
+	ganv_edge_bounds(item, &x1, &y1, &x2, &y2);
+
+	// Ensure bounding box has non-zero area
+	if (x1 == x2) {
+		x2 += 1.0;
+	}
+	if (y1 == y2) {
+		y2 += 1.0;
+	}
+
+	// Update world-relative bounding box
+	item->impl->x1 = x1;
+	item->impl->y1 = y1;
+	item->impl->x2 = x2;
+	item->impl->y2 = y2;
+	ganv_item_i2w_pair(item, &item->impl->x1, &item->impl->y1, &item->impl->x2, &item->impl->y2);
+
+	// Request redraw of new location
+	ganv_edge_request_redraw(item, &impl->coords);
+
+	parent_class->update(item, flags);
+}
+
+static void
+ganv_edge_draw(GanvItem* item,
+               cairo_t* cr, double cx, double cy, double cw, double ch)
+{
+	GanvEdge*        edge = GANV_EDGE(item);
+	GanvEdgePrivate* impl = edge->impl;
+
+	double src_x = impl->coords.x1;
+	double src_y = impl->coords.y1;
+	double dst_x = impl->coords.x2;
+	double dst_y = impl->coords.y2;
+	double dx    = src_x - dst_x;
+	double dy    = src_y - dst_y;
+
+	double r, g, b, a;
+	if (impl->highlighted) {
+		color_to_rgba(highlight_color(impl->color, 0x40), &r, &g, &b, &a);
+	} else {
+		color_to_rgba(impl->color, &r, &g, &b, &a);
+	}
+	cairo_set_source_rgba(cr, r, g, b, a);
+
+	cairo_set_line_width(cr, impl->coords.width);
+	cairo_move_to(cr, src_x, src_y);
+
+	const double dash_length = (impl->selected ? 4.0 : impl->dash_length);
+	if (dash_length > 0.0) {
+		double dashed[2] = { dash_length, dash_length };
+		cairo_set_dash(cr, dashed, 2, impl->dash_offset);
+	} else {
+		cairo_set_dash(cr, &dash_length, 0, 0);
+	}
+
+	const double join_x = (src_x + dst_x) / 2.0;
+	const double join_y = (src_y + dst_y) / 2.0;
+
+	if (impl->coords.curved) {
+		// Curved line as 2 paths which join at the middle point
+
+		// Path 1 (src_x, src_y) -> (join_x, join_y)
+		// Control point 1
+		const double src_x1 = impl->coords.cx1;
+		const double src_y1 = impl->coords.cy1;
+		// Control point 2
+		const double src_x2 = (join_x + src_x1) / 2.0;
+		const double src_y2 = (join_y + src_y1) / 2.0;
+
+		// Path 2, (join_x, join_y) -> (dst_x, dst_y)
+		// Control point 1
+		const double dst_x1 = impl->coords.cx2;
+		const double dst_y1 = impl->coords.cy2;
+		// Control point 2
+		const double dst_x2 = (join_x + dst_x1) / 2.0;
+		const double dst_y2 = (join_y + dst_y1) / 2.0;
+
+		cairo_move_to(cr, src_x, src_y);
+		cairo_curve_to(cr, src_x1, src_y1, src_x2, src_y2, join_x, join_y);
+		cairo_curve_to(cr, dst_x2, dst_y2, dst_x1, dst_y1, dst_x, dst_y);
+
+#ifdef GANV_DEBUG_CURVES
+		cairo_stroke(cr);
+		cairo_save(cr);
+		cairo_set_source_rgba(cr, 1.0, 0, 0, 0.5);
+
+		cairo_move_to(cr, src_x, src_y);
+		cairo_line_to(cr, src_x1, src_y1);
+		cairo_stroke(cr);
+
+		cairo_move_to(cr, join_x, join_y);
+		cairo_line_to(cr, src_x2, src_y2);
+		cairo_stroke(cr);
+
+		cairo_move_to(cr, join_x, join_y);
+		cairo_line_to(cr, dst_x2, dst_y2);
+		cairo_stroke(cr);
+
+		cairo_move_to(cr, dst_x, dst_y);
+		cairo_line_to(cr, dst_x1, dst_y1);
+		cairo_stroke(cr);
+
+#ifdef GANV_DEBUG_BOUNDS
+		double bounds_x1, bounds_y1, bounds_x2, bounds_y2;
+		ganv_edge_bounds(item, &bounds_x1, &bounds_y1, &bounds_x2, &bounds_y2);
+		cairo_rectangle(cr,
+		                bounds_x1, bounds_y1,
+		                bounds_x2 - bounds_x1, bounds_y2 - bounds_y1);
+#endif
+
+		cairo_restore(cr);
+#endif
+
+		cairo_stroke(cr);
+		if (impl->coords.arrowhead) {
+			cairo_move_to(cr, dst_x - 12, dst_y - 4);
+			cairo_line_to(cr, dst_x, dst_y);
+			cairo_line_to(cr, dst_x - 12, dst_y + 4);
+			cairo_close_path(cr);
+			cairo_stroke_preserve(cr);
+			cairo_fill(cr);
+		}
+
+	} else {
+		// Straight line from (x1, y1) to (x2, y2)
+		cairo_move_to(cr, src_x, src_y);
+		cairo_line_to(cr, dst_x, dst_y);
+		cairo_stroke(cr);
+
+		if (impl->coords.arrowhead) {
+			const double ah  = sqrt(dx * dx + dy * dy);
+			const double adx = dx / ah * 8.0;
+			const double ady = dy / ah * 8.0;
+
+			cairo_move_to(cr,
+			              dst_x + adx - ady/1.5,
+			              dst_y + ady + adx/1.5);
+			cairo_set_line_join(cr, CAIRO_LINE_JOIN_BEVEL);
+			cairo_line_to(cr, dst_x, dst_y);
+			cairo_set_line_join(cr, CAIRO_LINE_JOIN_MITER);
+			cairo_line_to(cr,
+			              dst_x + adx + ady/1.5,
+			              dst_y + ady - adx/1.5);
+			cairo_close_path(cr);
+			cairo_stroke_preserve(cr);
+			cairo_fill(cr);
+		}
+	}
+
+	if (!ganv_canvas_exporting(item->impl->canvas) &&
+	    impl->coords.handle_radius > 0.0) {
+		cairo_move_to(cr, join_x, join_y);
+		cairo_arc(cr, join_x, join_y, impl->coords.handle_radius, 0, 2 * G_PI);
+		cairo_fill(cr);
+	}
+}
+
+static double
+ganv_edge_point(GanvItem* item, double x, double y, GanvItem** actual_item)
+{
+	const GanvEdge*       edge = GANV_EDGE(item);
+	const GanvEdgeCoords* coords = &edge->impl->coords;
+
+	const double dx = fabs(x - coords->handle_x);
+	const double dy = fabs(y - coords->handle_y);
+	const double d  = sqrt((dx * dx) + (dy * dy));
+
+	*actual_item = item;
+
+	if (d <= coords->handle_radius) {
+		// Point is inside the handle
+		return 0.0;
+	} else {
+		// Distance from the edge of the handle
+		return d - (coords->handle_radius + coords->width);
+	}
+}
+
+gboolean
+ganv_edge_is_within(const GanvEdge* edge,
+                    double          x1,
+                    double          y1,
+                    double          x2,
+                    double          y2)
+{
+	const double handle_x = edge->impl->coords.handle_x;
+	const double handle_y = edge->impl->coords.handle_y;
+
+	return handle_x >= x1
+		&& handle_x <= x2
+		&& handle_y >= y1
+		&& handle_y <= y2;
+}
+
+static void
+ganv_edge_class_init(GanvEdgeClass* klass)
+{
+	GObjectClass*   gobject_class = (GObjectClass*)klass;
+	GtkObjectClass* object_class  = (GtkObjectClass*)klass;
+	GanvItemClass*  item_class    = (GanvItemClass*)klass;
+
+	parent_class = GANV_ITEM_CLASS(g_type_class_peek_parent(klass));
+
+	gobject_class->set_property = ganv_edge_set_property;
+	gobject_class->get_property = ganv_edge_get_property;
+
+	g_object_class_install_property(
+		gobject_class, PROP_TAIL, g_param_spec_object(
+			"tail",
+			_("Tail"),
+			_("Node this edge starts from."),
+			GANV_TYPE_NODE,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_HEAD, g_param_spec_object(
+			"head",
+			_("Head"),
+			_("Node this edge ends at."),
+			GANV_TYPE_NODE,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_WIDTH, g_param_spec_double(
+			"width",
+			_("Line width"),
+			_("Width of edge line."),
+			0.0, G_MAXDOUBLE,
+			2.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_HANDLE_RADIUS, g_param_spec_double(
+			"handle-radius",
+			_("Gandle radius"),
+			_("Radius of handle in canvas units."),
+			0.0, G_MAXDOUBLE,
+			4.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_DASH_LENGTH, g_param_spec_double(
+			"dash-length",
+			_("Line dash length"),
+			_("Length of line dashes, or zero for no dashing."),
+			0.0, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_DASH_OFFSET, g_param_spec_double(
+			"dash-offset",
+			_("Line dash offset"),
+			_("Start offset for line dashes, used for selected animation."),
+			0.0, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_COLOR, g_param_spec_uint(
+			"color",
+			_("Color"),
+			_("Line color as an RGBA integer."),
+			0, G_MAXUINT,
+			0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_CONSTRAINING, g_param_spec_boolean(
+			"constraining",
+			_("Constraining"),
+			_("Whether edge should constrain the layout."),
+			1,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_CURVED, g_param_spec_boolean(
+			"curved",
+			_("Curved"),
+			_("Whether line should be curved rather than straight."),
+			0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_ARROWHEAD, g_param_spec_boolean(
+			"arrowhead",
+			_("Arrowhead"),
+			_("Whether to show an arrowhead at the head of this edge."),
+			0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_SELECTED, g_param_spec_boolean(
+			"selected",
+			_("Selected"),
+			_("Whether this edge is selected."),
+			0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_HIGHLIGHTED, g_param_spec_boolean(
+			"highlighted",
+			_("Highlighted"),
+			_("Whether to highlight the edge."),
+			0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_GHOST, g_param_spec_boolean(
+			"ghost",
+			_("Ghost"),
+			_("Whether this edge is a `ghost', which is an edge that is not "
+			  "added to the canvas data structures.  Ghost edges are used for "
+			  "temporary edges that are not considered `real', e.g. the edge "
+			  "made while dragging to make a connection."),
+			0,
+			G_PARAM_READWRITE));
+
+	object_class->destroy = ganv_edge_destroy;
+
+	item_class->update = ganv_edge_update;
+	item_class->bounds = ganv_edge_bounds;
+	item_class->point  = ganv_edge_point;
+	item_class->draw   = ganv_edge_draw;
+}
+
+GanvEdge*
+ganv_edge_new(GanvCanvas* canvas,
+              GanvNode*   tail,
+              GanvNode*   head,
+              const char* first_prop_name, ...)
+{
+	GanvEdge* edge = GANV_EDGE(
+		g_object_new(ganv_edge_get_type(), NULL));
+
+	va_list args;
+	va_start(args, first_prop_name);
+	ganv_item_construct(&edge->item,
+	                    GANV_ITEM(ganv_canvas_root(canvas)),
+	                    first_prop_name, args);
+	va_end(args);
+
+	edge->impl->tail = tail;
+	edge->impl->head = head;
+
+	if (!edge->impl->color) {
+		const guint tail_color = GANV_NODE(tail)->impl->fill_color;
+		g_object_set(G_OBJECT(edge),
+		             "color", EDGE_COLOR(tail_color),
+		             NULL);
+	}
+
+	if (!edge->impl->ghost) {
+		ganv_canvas_add_edge(canvas, edge);
+	}
+	return edge;
+}
+
+void
+ganv_edge_update_location(GanvEdge* edge)
+{
+	ganv_item_request_update(GANV_ITEM(edge));
+}
+
+gboolean
+ganv_edge_get_constraining(const GanvEdge* edge)
+{
+	return edge->impl->coords.constraining;
+}
+
+void
+ganv_edge_set_constraining(GanvEdge* edge, gboolean constraining)
+{
+	edge->impl->coords.constraining = constraining;
+	ganv_edge_request_redraw(GANV_ITEM(edge), &edge->impl->coords);
+}
+
+gboolean
+ganv_edge_get_curved(const GanvEdge* edge)
+{
+	return edge->impl->coords.curved;
+}
+
+void
+ganv_edge_set_curved(GanvEdge* edge, gboolean curved)
+{
+	edge->impl->coords.curved = curved;
+	ganv_edge_request_redraw(GANV_ITEM(edge), &edge->impl->coords);
+}
+
+void
+ganv_edge_set_selected(GanvEdge* edge, gboolean selected)
+{
+	GanvCanvas* canvas = GANV_CANVAS(edge->item.impl->canvas);
+	if (selected) {
+		ganv_canvas_select_edge(canvas, edge);
+	} else {
+		ganv_canvas_unselect_edge(canvas, edge);
+	}
+}
+
+void
+ganv_edge_select(GanvEdge* edge)
+{
+	ganv_edge_set_selected(edge, TRUE);
+}
+
+void
+ganv_edge_unselect(GanvEdge* edge)
+{
+	ganv_edge_set_selected(edge, FALSE);
+}
+
+void
+ganv_edge_highlight(GanvEdge* edge)
+{
+	ganv_edge_set_highlighted(edge, TRUE);
+}
+
+void
+ganv_edge_unhighlight(GanvEdge* edge)
+{
+	ganv_edge_set_highlighted(edge, FALSE);
+}
+
+void
+ganv_edge_set_highlighted(GanvEdge* edge, gboolean highlighted)
+{
+	edge->impl->highlighted = highlighted;
+	ganv_edge_request_redraw(GANV_ITEM(edge), &edge->impl->coords);
+}
+
+void
+ganv_edge_tick(GanvEdge* edge, double seconds)
+{
+	ganv_item_set(GANV_ITEM(edge),
+	              "dash-offset", seconds * 8.0,
+	              NULL);
+}
+
+void
+ganv_edge_disconnect(GanvEdge* edge)
+{
+	if (!edge->impl->ghost) {
+		ganv_canvas_disconnect_edge(
+			GANV_CANVAS(edge->item.impl->canvas),
+			edge);
+	}
+}
+
+void
+ganv_edge_remove(GanvEdge* edge)
+{
+	if (!edge->impl->ghost) {
+		ganv_canvas_remove_edge(
+			GANV_CANVAS(edge->item.impl->canvas),
+			edge);
+	}
+}
+
+GanvNode*
+ganv_edge_get_tail(const GanvEdge* edge)
+{
+	return edge->impl->tail;
+}
+
+GanvNode*
+ganv_edge_get_head(const GanvEdge* edge)
+{
+	return edge->impl->head;
+}
diff --git a/src/fdgl.hpp b/src/fdgl.hpp
new file mode 100644
index 0000000..38fded1
--- /dev/null
+++ b/src/fdgl.hpp
@@ -0,0 +1,166 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <float.h>
+#include <math.h>
+
+static const double CHARGE_KE = 4000000.0;
+static const double EDGE_K    = 16.0;
+static const double EDGE_LEN  = 0.1;
+
+struct Region {
+	Vector pos;
+	Vector area;
+};
+
+inline Vector
+vec_add(const Vector& a, const Vector& b)
+{
+	const Vector result = { a.x + b.x, a.y + b.y };
+	return result;
+}
+
+inline Vector
+vec_sub(const Vector& a, const Vector& b)
+{
+	const Vector result = { a.x - b.x, a.y - b.y };
+	return result;
+}
+
+inline Vector
+vec_mult(const Vector& a, double m)
+{
+	const Vector result = { a.x * m, a.y * m };
+	return result;
+}
+
+inline double
+vec_mult(const Vector& a, const Vector& b)
+{
+	return a.x * b.x + a.y * b.y;
+}
+
+/** Magnitude. */
+inline double
+vec_mag(const Vector& vec)
+{
+	return sqrt(vec.x * vec.x + vec.y * vec.y);
+}
+
+/** Reciprocal of magnitude. */
+inline double
+vec_rmag(const Vector& vec)
+{
+	return 1.0 / sqrt(vec.x * vec.x + vec.y * vec.y);
+}
+
+/** Hooke's law */
+inline Vector
+spring_force(const Vector& a, const Vector& b, double length, double k)
+{
+	const Vector vec          = vec_sub(b, a);
+	const double mag          = vec_mag(vec);
+	const double displacement = length - mag;
+	return vec_mult(vec, k * displacement * 0.5 / mag);
+}
+
+/** Spring force with a directional force to align with flow direction. */
+static const Vector
+edge_force(const Vector& dir, const Vector& hpos, const Vector& tpos)
+{
+	return vec_add(dir, spring_force(hpos, tpos, EDGE_LEN, EDGE_K));
+}
+
+/** Constant tide force, does not vary with distance. */
+inline Vector
+tide_force(const Vector& a, const Vector& b, double power)
+{
+	static const double G   = 0.0000000000667;
+	const Vector        vec = vec_sub(a, b);
+	const double        mag = vec_mag(vec);
+	return vec_mult(vec, G * power / mag);
+}
+
+inline double
+rect_distance(Vector* vec,
+              const double ax1, const double ay1,
+              const double ax2, const double ay2,
+              const double bx1, const double by1,
+              const double bx2, const double by2)
+{
+	vec->x = 0.0;
+	vec->y = 0.0;
+
+	if (ax2 <= bx1) {  // A is completely to the left of B
+		vec->x = ax2 - bx1;
+		if (ay2 <= by1) {  // Top Left
+			const double dx = bx1 - ax2;
+			const double dy = by1 - ay2;
+			vec->y = ay2 - by1;
+			return sqrt(dx * dx + dy * dy);
+		} else if (ay1 >= by2) {  // Bottom left
+			const double dx = bx1 - ax2;
+			const double dy = ay1 - by2;
+			vec->y = ay1 - by2;
+			return sqrt(dx * dx + dy * dy);
+		} else {  // Left
+			return bx1 - ax2;
+		}
+	} else if (ax1 >= bx2) {  //  A is completely to the right of B
+		vec->x = ax1 - bx2;
+		if (ay2 <= by1) {  // Top right
+			const double dx = ax1 - bx2;
+			const double dy = by1 - ay2;
+			vec->y = ay2 - by1;
+			return sqrt(dx * dx + dy * dy);
+		} else if (ay1 >= by2) {  // Bottom right
+			const double dx = ax1 - bx2;
+			const double dy = ay1 - by2;
+			vec->y = ay1 - by2;
+			return sqrt(dx * dx + dy * dy);
+		} else {  // Right
+			return ax1 - bx2;
+		}
+	} else if (ay2 <= by1) {  // Top
+		vec->y = ay2 - by1;
+		return by1 - ay2;
+	} else if (ay1 >= by2) {  // Bottom
+		vec->y = ay1 - by2;
+		return ay1 - by2;
+	} else {  // Overlap
+		return 0.0;
+	}
+}
+
+/** Repelling charge force, ala Coulomb's law. */
+inline Vector
+repel_force(const Region& a, const Region& b)
+{
+	static const double MIN_DIST = 1.0;
+
+	Vector vec;
+	double dist = rect_distance(
+		&vec,
+		a.pos.x - (a.area.x / 2.0), a.pos.y - (a.area.y / 2.0),
+		a.pos.x + (a.area.x / 2.0), a.pos.y + (a.area.y / 2.0),
+		b.pos.x - (b.area.x / 2.0), b.pos.y - (b.area.y / 2.0),
+		b.pos.x + (b.area.x / 2.0), b.pos.y + (b.area.y / 2.0));
+
+	if (dist <= MIN_DIST) {
+		dist = MIN_DIST;
+		vec  = vec_sub(a.pos, b.pos);
+	}
+	return vec_mult(vec, (CHARGE_KE * 0.5 / (vec_mag(vec) * dist * dist)));
+}
diff --git a/src/ganv-marshal.list b/src/ganv-marshal.list
new file mode 100644
index 0000000..64e6c6b
--- /dev/null
+++ b/src/ganv-marshal.list
@@ -0,0 +1,4 @@
+BOOLEAN:BOXED
+VOID:DOUBLE,DOUBLE
+VOID:OBJECT,INT,INT,INT,INT
+VOID:OBJECT,OBJECT
diff --git a/src/ganv-private.h b/src/ganv-private.h
new file mode 100644
index 0000000..df611a9
--- /dev/null
+++ b/src/ganv-private.h
@@ -0,0 +1,403 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_PRIVATE_H
+#define GANV_PRIVATE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <cairo.h>
+
+#include "ganv/canvas.h"
+#include "ganv/text.h"
+#include "ganv/types.h"
+
+#define GANV_CLOSE_ENOUGH 1
+
+extern guint signal_moved;
+
+/* Box */
+
+typedef struct {
+	double   x1, y1, x2, y2;
+	double   border_width;
+	gboolean stacked;
+} GanvBoxCoords;
+
+struct _GanvBoxPrivate {
+	GanvBoxCoords coords;
+	GanvBoxCoords old_coords;
+	double        radius_tl;
+	double        radius_tr;
+	double        radius_br;
+	double        radius_bl;
+	gboolean      beveled;
+};
+
+/* Circle */
+
+typedef struct {
+	double x, y, radius, radius_ems;
+	double width;
+} GanvCircleCoords;
+
+struct _GanvCirclePrivate {
+	GanvCircleCoords coords;
+	GanvCircleCoords old_coords;
+	gboolean         fit_label;
+};
+
+/* Edge */
+
+typedef struct {
+	double   x1, y1, x2, y2;
+	double   cx1, cy1, cx2, cy2;
+	double   handle_x, handle_y, handle_radius;
+	double   width;
+	gboolean constraining;
+	gboolean curved;
+	gboolean arrowhead;
+} GanvEdgeCoords;
+
+struct _GanvEdgePrivate
+{
+	GanvNode*       tail;
+	GanvNode*       head;
+	GanvEdgeCoords  coords;
+	GanvEdgeCoords  old_coords;
+	double          dash_length;
+	double          dash_offset;
+	guint           color;
+	gboolean        selected;
+	gboolean        highlighted;
+	gboolean        ghost;
+};
+
+/* Module */
+
+struct _GanvModulePrivate
+{
+	GPtrArray* ports;
+	GanvItem*  embed_item;
+	int        embed_width;
+	int        embed_height;
+	double     widest_input;
+	double     widest_output;
+	gboolean   must_reorder;
+};
+
+/* Node */
+
+#ifdef GANV_FDGL
+typedef struct {
+	double x;
+	double y;
+} Vector;
+#endif
+
+struct _GanvNodePrivate {
+	struct _GanvNode* partner;
+	GanvText*         label;
+	double            dash_length;
+	double            dash_offset;
+	double            border_width;
+	guint             fill_color;
+	guint             border_color;
+	gboolean          can_tail;
+	gboolean          can_head;
+	gboolean          is_source;
+	gboolean          selected;
+	gboolean          highlighted;
+	gboolean          draggable;
+	gboolean          show_label;
+	gboolean          grabbed;
+	gboolean          must_resize;
+#ifdef GANV_FDGL
+	Vector            force;
+	Vector            vel;
+	gboolean          connected;
+#endif
+};
+
+/* Widget */
+
+struct _GanvWidgetPrivate {
+	GtkWidget* widget;          /* The child widget */
+
+	double        x, y;			/* Position at anchor */
+	double        width, height; /* Dimensions of widget */
+	GtkAnchorType anchor;		/* Anchor side for widget */
+
+	int cx, cy;                 /* Top-left canvas coordinates for widget */
+	int cwidth, cheight;		/* Size of widget in pixels */
+
+	guint destroy_id;           /* Signal connection id for destruction of child widget */
+
+	guint size_pixels : 1;		/* Is size specified in (unchanging) pixels or units (get scaled)? */
+	guint in_destroy : 1;		/* Is child widget being destroyed? */
+};
+
+/* Group */
+struct _GanvGroupPrivate {
+	GList* item_list;
+	GList* item_list_end;
+};
+
+/* Item */
+struct _GanvItemPrivate {
+	/* Parent canvas for this item */
+	struct _GanvCanvas* canvas;
+
+	/* Parent for this item */
+	GanvItem* parent;
+
+	/* Wrapper object for this item, if any */
+	void* wrapper;
+
+	/* Layer (z order), higher values are on top */
+	guint layer;
+
+	/* Position in parent-relative coordinates. */
+	double x, y;
+
+	/* Bounding box for this item (in world coordinates) */
+	double x1, y1, x2, y2;
+
+	/* True if parent manages this item (don't call add/remove) */
+	gboolean managed;
+};
+
+void
+ganv_node_tick(GanvNode* self, double seconds);
+
+void
+ganv_node_tail_vector(const GanvNode* self,
+                      const GanvNode* head,
+                      double*         x1,
+                      double*         y1,
+                      double*         x2,
+                      double*         y2);
+
+void
+ganv_node_head_vector(const GanvNode* self,
+                      const GanvNode* tail,
+                      double*         x1,
+                      double*         y1,
+                      double*         x2,
+                      double*         y2);
+
+/**
+ * ganv_node_get_draw_properties:
+ *
+ * Get the colours that should currently be used for drawing this node.  Note
+ * these may not be identical to the property values because of highlighting
+ * and selection.
+ */
+void
+ganv_node_get_draw_properties(const GanvNode* node,
+                              double*         dash_length,
+                              double*         border_color,
+                              double*         fill_color);
+
+/* Port */
+
+typedef struct {
+	GanvBox*  rect;
+	float     value;
+	float     min;
+	float     max;
+	gboolean  is_toggle;
+	gboolean  is_integer;
+} GanvPortControl;
+
+struct _GanvPortPrivate {
+	GanvPortControl* control;
+	GanvText*        value_label;
+	gboolean         is_input;
+	gboolean         is_controllable;
+};
+
+/* Text */
+
+typedef struct
+{
+	double x;
+	double y;
+	double width;
+	double height;
+} GanvTextCoords;
+
+struct _GanvTextPrivate
+{
+	PangoLayout*     layout;
+	char*            text;
+	GanvTextCoords   coords;
+	GanvTextCoords   old_coords;
+	double           font_size;
+	guint            color;
+	gboolean         needs_layout;
+};
+
+/* Canvas */
+
+typedef struct {
+	GanvPortOrderFunc port_cmp;
+	void*             data;
+} PortOrderCtx;
+
+void
+ganv_canvas_move_selected_items(GanvCanvas* canvas,
+                                double      dx,
+                                double      dy);
+
+void
+ganv_canvas_selection_move_finished(GanvCanvas* canvas);
+
+void
+ganv_canvas_add_node(GanvCanvas* canvas,
+                     GanvNode*   node);
+
+void
+ganv_canvas_remove_node(GanvCanvas* canvas,
+                        GanvNode*   node);
+
+void
+ganv_canvas_select_node(GanvCanvas* canvas,
+                        GanvNode*   node);
+
+void
+ganv_canvas_unselect_node(GanvCanvas* canvas,
+                          GanvNode*   node);
+
+void
+ganv_canvas_add_edge(GanvCanvas* canvas,
+                     GanvEdge*   edge);
+
+void
+ganv_canvas_select_edge(GanvCanvas* canvas,
+                        GanvEdge*   edge);
+
+void
+ganv_canvas_unselect_edge(GanvCanvas* canvas,
+                          GanvEdge*   edge);
+
+void
+ganv_canvas_disconnect_edge(GanvCanvas* canvas,
+                            GanvEdge*   edge);
+
+gboolean
+ganv_canvas_port_event(GanvCanvas* canvas,
+                       GanvPort*   port,
+                       GdkEvent*   event);
+
+void
+ganv_canvas_contents_changed(GanvCanvas* canvas);
+
+void
+ganv_item_i2w_offset(GanvItem* item, double* px, double* py);
+
+void
+ganv_item_i2w_pair(GanvItem* item, double* x1, double* y1, double* x2, double* y2);
+
+void
+ganv_item_invoke_update(GanvItem* item, int flags);
+
+void
+ganv_item_emit_event(GanvItem* item, GdkEvent* event, gint* finished);
+
+void
+ganv_canvas_request_update(GanvCanvas* canvas);
+
+int
+ganv_canvas_emit_event(GanvCanvas* canvas, GdkEvent* event);
+
+void
+ganv_canvas_set_need_repick(GanvCanvas* canvas);
+
+void
+ganv_canvas_forget_item(GanvCanvas* canvas, GanvItem* item);
+
+void
+ganv_canvas_grab_focus(GanvCanvas* canvas, GanvItem* item);
+
+void
+ganv_canvas_get_zoom_offsets(GanvCanvas* canvas, int* x, int* y);
+
+int
+ganv_canvas_grab_item(GanvItem* item, guint event_mask, GdkCursor* cursor, guint32 etime);
+
+void
+ganv_canvas_ungrab_item(GanvItem* item, guint32 etime);
+
+/* Request a redraw of the specified rectangle in canvas coordinates */
+void
+ganv_canvas_request_redraw_c(GanvCanvas* canvas,
+                             int x1, int y1, int x2, int y2);
+
+/* Request a redraw of the specified rectangle in world coordinates */
+void
+ganv_canvas_request_redraw_w(GanvCanvas* canvas,
+                             double x1, double y1, double x2, double y2);
+
+PortOrderCtx
+ganv_canvas_get_port_order(GanvCanvas* canvas);
+
+gboolean
+ganv_canvas_exporting(GanvCanvas* canvas);
+
+/* Edge */
+
+void
+ganv_edge_update_location(GanvEdge* edge);
+
+void
+ganv_edge_get_coords(const GanvEdge* edge, GanvEdgeCoords* coords);
+
+void
+ganv_edge_request_redraw(GanvItem*             item,
+                         const GanvEdgeCoords* coords);
+
+void
+ganv_edge_tick(GanvEdge* edge, double seconds);
+
+/* Box */
+
+void
+ganv_box_path(GanvBox* box,
+              cairo_t* cr, double x1, double y1, double x2, double  y2,
+              double dr);
+
+void
+ganv_box_request_redraw(GanvItem*            item,
+                        const GanvBoxCoords* coords,
+                        gboolean             world);
+
+/* Port */
+
+void
+ganv_port_set_control_value_internal(GanvPort* port,
+                                     float     value);
+
+void
+ganv_port_set_direction(GanvPort*     port,
+                        GanvDirection direction);
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif  /* GANV_PRIVATE_H */
diff --git a/src/ganv_bench.cpp b/src/ganv_bench.cpp
new file mode 100644
index 0000000..b1bdefb
--- /dev/null
+++ b/src/ganv_bench.cpp
@@ -0,0 +1,178 @@
+/* This file is part of Ganv.
+ * Copyright 2013 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <glibmm.h>
+#include <gtkmm/main.h>
+#include <gtkmm/scrolledwindow.h>
+#include <gtkmm/window.h>
+
+#include "ganv/ganv.hpp"
+
+using namespace std;
+using namespace Ganv;
+
+static const int MAX_NUM_PORTS = 16;
+
+vector<Node*> ins;
+vector<Node*> outs;
+
+static Module*
+make_module(Canvas* canvas)
+{
+	char name[8];
+
+	snprintf(name, 8, "mod%d", rand() % 10000);
+	Module* m(new Module(*canvas, name,
+	                     rand() % (int)canvas->get_width(),
+	                     rand() % (int)canvas->get_height(),
+	                     true));
+
+	int n_ins = rand() % MAX_NUM_PORTS;
+	for (int i = 0; i < n_ins; ++i) {
+		snprintf(name, 8, "in%d", rand() % 10000);
+		Port* p(new Port(*m, name, true,
+		                 ((rand() % 0xFFFFFF) << 8) | 0xFF));
+		ins.push_back(p);
+	}
+
+	int n_outs = rand() % MAX_NUM_PORTS;
+	for (int i = 0; i < n_outs; ++i) {
+		snprintf(name, 8, "out%d", rand() % 10000);
+		Port* p(new Port(*m, name, false,
+		                 ((rand() % 0xFFFFFF) << 8) | 0xFF));
+		outs.push_back(p);
+	}
+
+	m->show();
+	return m;
+}
+
+static Circle*
+make_circle(Canvas* canvas)
+{
+	char name[8];
+
+	snprintf(name, 8, "%d", rand() % 10000);
+	Circle* e(new Circle(*canvas, name,
+	                     rand() % (int)canvas->get_width(),
+	                     rand() % (int)canvas->get_height()));
+
+	ins.push_back(e);
+	outs.push_back(e);
+
+	return e;
+}
+
+static bool
+quit()
+{
+	Gtk::Main::quit();
+	return true;
+}
+
+static int
+print_usage(const char* name)
+{
+	fprintf(stderr,
+	        "USAGE: %s [OPTION]... CANVAS_W CANVAS_H N_MODULES N_CIRCLES N_EDGES\n\n"
+	        "Options:\n"
+	        "  -o  Remain open (do not close immediately)\n"
+	        "  -a  Arrange canvas\n"
+	        "  -s  Straight edges\n",
+	        name);
+	return 1;
+}
+
+int
+main(int argc, char** argv)
+{
+	if (argc < 5) {
+		return print_usage(argv[0]);
+	}
+
+	int arg = 1;
+
+	bool remain_open = false;
+	bool arrange     = false;
+	bool straight    = false;
+	for (; arg < argc && argv[arg][0] == '-'; ++arg) {
+		if (argv[arg][1] == 'o') {
+			remain_open = true;
+		} else if (argv[arg][1] == 'a') {
+			arrange = true;
+		} else if (argv[arg][1] == 's') {
+			straight = true;
+		} else {
+			return print_usage(argv[0]);
+		}
+	}
+
+	const int canvas_w = atoi(argv[arg++]);
+	const int canvas_h = atoi(argv[arg++]);
+
+	if (argc - arg < 3) {
+		return print_usage(argv[0]);
+	}
+
+	const int n_modules = atoi(argv[arg++]);
+	const int n_circles = atoi(argv[arg++]);
+	const int n_edges   = atoi(argv[arg++]);
+
+	srand(time(NULL));
+
+	Gtk::Main kit(argc, argv);
+
+	Gtk::Window window;
+	Gtk::ScrolledWindow* scroller = Gtk::manage(new Gtk::ScrolledWindow());
+
+	Canvas* canvas = new Canvas(canvas_w, canvas_h);
+	scroller->add(canvas->widget());
+	window.add(*scroller);
+
+	window.show_all();
+
+	for (int i = 0; i < n_modules; ++i) {
+		make_module(canvas);
+	}
+
+	for (int i = 0; i < n_circles; ++i) {
+		make_circle(canvas);
+	}
+
+	for (int i = 0; i < n_edges; ++i) {
+		Node* src = outs[rand() % outs.size()];
+		Node* dst = ins[rand() % ins.size()];
+		Edge* c = new Edge(*canvas, src, dst, 0x808080FF);
+		if (straight) {
+			c->set_curved(false);
+		}
+	}
+
+	if (arrange) {
+		canvas->arrange();
+	}
+
+	if (!remain_open) {
+		Glib::signal_idle().connect(sigc::ptr_fun(quit));
+	}
+
+	Gtk::Main::run(window);
+
+	return 0;
+}
diff --git a/src/ganv_test.c b/src/ganv_test.c
new file mode 100644
index 0000000..ec1b0a8
--- /dev/null
+++ b/src/ganv_test.c
@@ -0,0 +1,119 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2013 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <gtk/gtk.h>
+
+#include "ganv/ganv.h"
+
+static void
+on_window_destroy(GtkWidget* widget, void* data)
+{
+	gtk_main_quit();
+}
+
+static void
+on_connect(GanvCanvas* canvas, GanvNode* tail, GanvNode* head, void* data)
+{
+	ganv_edge_new(canvas, tail, head, "color", 0xFFFFFFFF, NULL);
+}
+
+static void
+on_disconnect(GanvCanvas* canvas, GanvNode* tail, GanvNode* head, void* data)
+{
+	ganv_canvas_remove_edge_between(canvas, tail, head);
+}
+
+static void
+on_value_changed(GanvPort* port, double value, void* data)
+{
+	fprintf(stderr, "Value changed: port %p = %lf\n", (void*)port, value);
+}
+
+int
+main(int argc, char** argv)
+{
+	gtk_init(&argc, &argv);
+
+	GtkWindow* win = GTK_WINDOW(gtk_window_new(GTK_WINDOW_TOPLEVEL));
+	gtk_window_set_title(win, "Ganv Test");
+	g_signal_connect(win, "destroy",
+	                 G_CALLBACK(on_window_destroy), NULL);
+
+	GanvCanvas* canvas = ganv_canvas_new(1024, 768);
+	gtk_container_add(GTK_CONTAINER(win), GTK_WIDGET(canvas));
+
+	GanvCircle* circle = ganv_circle_new(canvas,
+	                                     "x", 400.0,
+	                                     "y", 400.0,
+	                                     "draggable", TRUE,
+	                                     "label", "state",
+	                                     "radius", 32.0,
+	                                     NULL);
+	ganv_item_show(GANV_ITEM(circle));
+
+	GanvModule* module = ganv_module_new(canvas,
+	                                     "x", 10.0,
+	                                     "y", 10.0,
+	                                     "draggable", TRUE,
+	                                     "label", "test",
+	                                     NULL);
+
+	ganv_port_new(module, FALSE,
+	              "label", "Signal",
+	              NULL);
+
+	GanvPort* cport = ganv_port_new(module, TRUE,
+	                                "label", "Control",
+	                                NULL);
+	ganv_port_show_control(cport);
+	g_signal_connect(cport, "value-changed",
+	                 G_CALLBACK(on_value_changed), NULL);
+
+	//GtkWidget* entry = gtk_entry_new();
+	//ganv_module_embed(module, entry);
+
+	GanvPort* tport = ganv_port_new(module, TRUE,
+	                                "label", "Toggle",
+	                                NULL);
+	ganv_port_show_control(tport);
+	ganv_port_set_control_is_toggle(tport, TRUE);
+
+	ganv_item_show(GANV_ITEM(module));
+
+	GanvModule* module2 = ganv_module_new(canvas,
+	                                      "x", 200.0,
+	                                      "y", 10.0,
+	                                      "draggable", TRUE,
+	                                      "label", "test2",
+	                                      NULL);
+
+	ganv_port_new(module2, TRUE,
+	              "label", "Signal",
+	              NULL);
+
+	g_signal_connect(canvas, "connect",
+	                 G_CALLBACK(on_connect), canvas);
+
+	g_signal_connect(canvas, "disconnect",
+	                 G_CALLBACK(on_disconnect), canvas);
+
+	ganv_item_show(GANV_ITEM(module2));
+
+	gtk_widget_show_all(GTK_WIDGET(win));
+	gtk_window_present(win);
+	gtk_main();
+
+	return 0;
+}
diff --git a/src/ganv_test.py b/src/ganv_test.py
new file mode 100755
index 0000000..1ea53c2
--- /dev/null
+++ b/src/ganv_test.py
@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+
+from gi.repository import Ganv, Gtk
+
+win = Gtk.Window()
+win.set_title("Ganv Python Test")
+win.connect("destroy", lambda obj: Gtk.main_quit())
+
+canvas = Ganv.Canvas.new(1024, 768)
+module = Ganv.Module(canvas=canvas,
+                     label="Test")
+# iport = Ganv.Port(module=module,
+#                   is_input=True,
+#                   label="In")
+# oport = Ganv.Port(module=module,
+#                   is_input=False,
+#                   label="In")
+
+win.add(canvas)
+win.show_all()
+win.present()
+Gtk.main()
diff --git a/src/gettext.h b/src/gettext.h
new file mode 100644
index 0000000..d32bb70
--- /dev/null
+++ b/src/gettext.h
@@ -0,0 +1,26 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2013 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GANV_GETTEXT_H
+#define GANV_GETTEXT_H
+
+#ifdef ENABLE_NLS
+#    include <libintl.h>
+#    define _(str) dgettext("ganv", str)
+#else
+#    define _(str) str
+#endif
+
+#endif  /* GANV_GETTEXT_H */
diff --git a/src/group.c b/src/group.c
new file mode 100644
index 0000000..503e57b
--- /dev/null
+++ b/src/group.c
@@ -0,0 +1,446 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Based on GnomeCanvasGroup, by Federico Mena <federico@nuclecu.unam.mx>
+ * and Raph Levien <raph@gimp.org>
+ * Copyright 1997-2000 Free Software Foundation
+ */
+
+#include <math.h>
+
+#include "ganv/canvas.h"
+#include "ganv/group.h"
+
+#include "./gettext.h"
+#include "./ganv-private.h"
+
+enum {
+	GROUP_PROP_0
+};
+
+G_DEFINE_TYPE_WITH_CODE(GanvGroup, ganv_group, GANV_TYPE_ITEM,
+                        G_ADD_PRIVATE(GanvGroup))
+
+static GanvItemClass* group_parent_class;
+
+static void
+ganv_group_init(GanvGroup* group)
+{
+	GanvGroupPrivate* impl = ganv_group_get_instance_private(group);
+
+	group->impl                = impl;
+	group->impl->item_list     = NULL;
+	group->impl->item_list_end = NULL;
+}
+
+static void
+ganv_group_set_property(GObject* gobject, guint param_id,
+                        const GValue* value, GParamSpec* pspec)
+{
+	g_return_if_fail(GANV_IS_GROUP(gobject));
+
+	switch (param_id) {
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(gobject, param_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_group_get_property(GObject* gobject, guint param_id,
+                        GValue* value, GParamSpec* pspec)
+{
+	g_return_if_fail(GANV_IS_GROUP(gobject));
+
+	switch (param_id) {
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(gobject, param_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_group_destroy(GtkObject* object)
+{
+	GanvGroup* group;
+
+	g_return_if_fail(GANV_IS_GROUP(object));
+
+	group = GANV_GROUP(object);
+
+	while (group->impl->item_list) {
+		// child is unref'ed by the child's group_remove().
+		gtk_object_destroy(GTK_OBJECT(group->impl->item_list->data));
+	}
+	if (GTK_OBJECT_CLASS(group_parent_class)->destroy) {
+		(*GTK_OBJECT_CLASS(group_parent_class)->destroy)(object);
+	}
+}
+
+static void
+ganv_group_update(GanvItem* item, int flags)
+{
+	GanvGroup* group = GANV_GROUP(item);
+
+	double min_x = 0.0;
+	double min_y = 0.0;
+	double max_x = 0.0;
+	double max_y = 0.0;
+
+	for (GList* list = group->impl->item_list; list; list = list->next) {
+		GanvItem* i = (GanvItem*)list->data;
+
+		ganv_item_invoke_update(i, flags);
+
+		min_x = fmin(min_x, fmin(i->impl->x1, i->impl->x2));
+		min_y = fmin(min_y, fmin(i->impl->y1, i->impl->y2));
+		max_x = fmax(max_x, fmax(i->impl->x1, i->impl->x2));
+		max_y = fmax(max_y, fmax(i->impl->y2, i->impl->y2));
+	}
+	item->impl->x1 = min_x;
+	item->impl->y1 = min_y;
+	item->impl->x2 = max_x;
+	item->impl->y2 = max_y;
+
+	(*group_parent_class->update)(item, flags);
+}
+
+static void
+ganv_group_realize(GanvItem* item)
+{
+	GanvGroup* group;
+	GList*     list;
+	GanvItem*  i;
+
+	group = GANV_GROUP(item);
+
+	for (list = group->impl->item_list; list; list = list->next) {
+		i = (GanvItem*)list->data;
+
+		if (!(i->object.flags & GANV_ITEM_REALIZED)) {
+			(*GANV_ITEM_GET_CLASS(i)->realize)(i);
+		}
+	}
+
+	(*group_parent_class->realize)(item);
+}
+
+static void
+ganv_group_unrealize(GanvItem* item)
+{
+	GanvGroup* group;
+	GList*     list;
+	GanvItem*  i;
+
+	group = GANV_GROUP(item);
+
+	for (list = group->impl->item_list; list; list = list->next) {
+		i = (GanvItem*)list->data;
+
+		if (i->object.flags & GANV_ITEM_REALIZED) {
+			(*GANV_ITEM_GET_CLASS(i)->unrealize)(i);
+		}
+	}
+
+	(*group_parent_class->unrealize)(item);
+}
+
+static void
+ganv_group_map(GanvItem* item)
+{
+	GanvGroup* group;
+	GList*     list;
+	GanvItem*  i;
+
+	group = GANV_GROUP(item);
+
+	for (list = group->impl->item_list; list; list = list->next) {
+		i = (GanvItem*)list->data;
+
+		if (!(i->object.flags & GANV_ITEM_MAPPED)) {
+			(*GANV_ITEM_GET_CLASS(i)->map)(i);
+		}
+	}
+
+	(*group_parent_class->map)(item);
+}
+
+static void
+ganv_group_unmap(GanvItem* item)
+{
+	GanvGroup* group;
+	GList*     list;
+	GanvItem*  i;
+
+	group = GANV_GROUP(item);
+
+	for (list = group->impl->item_list; list; list = list->next) {
+		i = (GanvItem*)list->data;
+
+		if (i->object.flags & GANV_ITEM_MAPPED) {
+			(*GANV_ITEM_GET_CLASS(i)->unmap)(i);
+		}
+	}
+
+	(*group_parent_class->unmap)(item);
+}
+
+static void
+ganv_group_draw(GanvItem* item,
+                cairo_t* cr, double cx, double cy, double cw, double ch)
+{
+	GanvGroup* group = GANV_GROUP(item);
+
+	// TODO: Layered drawing
+
+	for (GList* list = group->impl->item_list; list; list = list->next) {
+		GanvItem* child = (GanvItem*)list->data;
+
+		if (((child->object.flags & GANV_ITEM_VISIBLE)
+		     && ((child->impl->x1 < (cx + cw))
+		         && (child->impl->y1 < (cy + ch))
+		         && (child->impl->x2 > cx)
+		         && (child->impl->y2 > cy)))) {
+			if (GANV_ITEM_GET_CLASS(child)->draw) {
+				(*GANV_ITEM_GET_CLASS(child)->draw)(
+					child, cr, cx, cy, cw, ch);
+			}
+		}
+	}
+}
+
+static double
+ganv_group_point(GanvItem* item, double x, double y, GanvItem** actual_item)
+{
+	GanvGroup* group = GANV_GROUP(item);
+
+	const double x1 = x - GANV_CLOSE_ENOUGH;
+	const double y1 = y - GANV_CLOSE_ENOUGH;
+	const double x2 = x + GANV_CLOSE_ENOUGH;
+	const double y2 = y + GANV_CLOSE_ENOUGH;
+
+	double dist = 0.0;
+	double best = 0.0;
+
+	*actual_item = NULL;
+
+	for (GList* list = group->impl->item_list; list; list = list->next) {
+		GanvItem* child = (GanvItem*)list->data;
+		if ((child->impl->x1 > x2) || (child->impl->y1 > y2) || (child->impl->x2 < x1) || (child->impl->y2 < y1)) {
+			continue;
+		}
+
+		GanvItem* point_item = NULL;
+
+		int has_point = FALSE;
+		if ((child->object.flags & GANV_ITEM_VISIBLE)
+		    && GANV_ITEM_GET_CLASS(child)->point) {
+			dist = GANV_ITEM_GET_CLASS(child)->point(
+				child,
+				x - child->impl->x, y - child->impl->y,
+				&point_item);
+			has_point = TRUE;
+		}
+
+		if (has_point
+		    && point_item
+		    && ((int)(dist + 0.5) <= GANV_CLOSE_ENOUGH)) {
+			best         = dist;
+			*actual_item = point_item;
+		}
+	}
+
+	if (*actual_item) {
+		return best;
+	} else {
+		*actual_item = item;
+		return 0.0;
+	}
+}
+
+/* Get bounds of child item in group-relative coordinates. */
+static void
+get_child_bounds(GanvItem* child, double* x1, double* y1, double* x2, double* y2)
+{
+	ganv_item_get_bounds(child, x1, y1, x2, y2);
+
+	// Make bounds relative to the item's parent coordinate system
+	*x1 -= child->impl->x;
+	*y1 -= child->impl->y;
+	*x2 -= child->impl->x;
+	*y2 -= child->impl->y;
+}
+
+static void
+ganv_group_bounds(GanvItem* item, double* x1, double* y1, double* x2, double* y2)
+{
+	GanvGroup* group;
+	GanvItem*  child;
+	GList*     list;
+	double     tx1, ty1, tx2, ty2;
+	double     minx, miny, maxx, maxy;
+	int        set;
+
+	group = GANV_GROUP(item);
+
+	/* Get the bounds of the first visible item */
+
+	child = NULL; /* Unnecessary but eliminates a warning. */
+
+	set = FALSE;
+
+	for (list = group->impl->item_list; list; list = list->next) {
+		child = (GanvItem*)list->data;
+
+		if (child->object.flags & GANV_ITEM_VISIBLE) {
+			set = TRUE;
+			get_child_bounds(child, &minx, &miny, &maxx, &maxy);
+			break;
+		}
+	}
+
+	/* If there were no visible items, return an empty bounding box */
+
+	if (!set) {
+		*x1 = *y1 = *x2 = *y2 = 0.0;
+		return;
+	}
+
+	/* Now we can grow the bounds using the rest of the items */
+
+	list = list->next;
+
+	for (; list; list = list->next) {
+		child = (GanvItem*)list->data;
+
+		if (!(child->object.flags & GANV_ITEM_VISIBLE)) {
+			continue;
+		}
+
+		get_child_bounds(child, &tx1, &ty1, &tx2, &ty2);
+
+		if (tx1 < minx) {
+			minx = tx1;
+		}
+
+		if (ty1 < miny) {
+			miny = ty1;
+		}
+
+		if (tx2 > maxx) {
+			maxx = tx2;
+		}
+
+		if (ty2 > maxy) {
+			maxy = ty2;
+		}
+	}
+
+	*x1 = minx;
+	*y1 = miny;
+	*x2 = maxx;
+	*y2 = maxy;
+}
+
+static void
+ganv_group_add(GanvItem* parent, GanvItem* item)
+{
+	GanvGroup* group = GANV_GROUP(parent);
+	g_object_ref_sink(G_OBJECT(item));
+
+	if (!group->impl->item_list) {
+		group->impl->item_list     = g_list_append(group->impl->item_list, item);
+		group->impl->item_list_end = group->impl->item_list;
+	} else {
+		group->impl->item_list_end = g_list_append(group->impl->item_list_end, item)->next;
+	}
+
+	if (group->item.object.flags & GANV_ITEM_REALIZED) {
+		(*GANV_ITEM_GET_CLASS(item)->realize)(item);
+	}
+
+	if (group->item.object.flags & GANV_ITEM_MAPPED) {
+		(*GANV_ITEM_GET_CLASS(item)->map)(item);
+	}
+
+	g_object_notify(G_OBJECT(item), "parent");
+}
+
+static void
+ganv_group_remove(GanvItem* parent, GanvItem* item)
+{
+	GanvGroup* group = GANV_GROUP(parent);
+	GList* children;
+
+	g_return_if_fail(GANV_IS_GROUP(group));
+	g_return_if_fail(GANV_IS_ITEM(item));
+
+	for (children = group->impl->item_list; children; children = children->next) {
+		if (children->data == item) {
+			if (item->object.flags & GANV_ITEM_MAPPED) {
+				(*GANV_ITEM_GET_CLASS(item)->unmap)(item);
+			}
+
+			if (item->object.flags & GANV_ITEM_REALIZED) {
+				(*GANV_ITEM_GET_CLASS(item)->unrealize)(item);
+			}
+
+			/* Unparent the child */
+
+			item->impl->parent = NULL;
+			g_object_unref(G_OBJECT(item));
+
+			/* Remove it from the list */
+
+			if (children == group->impl->item_list_end) {
+				group->impl->item_list_end = children->prev;
+			}
+
+			group->impl->item_list = g_list_remove_link(group->impl->item_list, children);
+			g_list_free(children);
+			break;
+		}
+	}
+}
+
+static void
+ganv_group_class_init(GanvGroupClass* klass)
+{
+	GObjectClass*   gobject_class;
+	GtkObjectClass* object_class;
+	GanvItemClass*  item_class;
+
+	gobject_class = (GObjectClass*)klass;
+	object_class  = (GtkObjectClass*)klass;
+	item_class    = (GanvItemClass*)klass;
+
+	group_parent_class = (GanvItemClass*)g_type_class_peek_parent(klass);
+
+	gobject_class->set_property = ganv_group_set_property;
+	gobject_class->get_property = ganv_group_get_property;
+
+	object_class->destroy = ganv_group_destroy;
+
+	item_class->add       = ganv_group_add;
+	item_class->remove    = ganv_group_remove;
+	item_class->update    = ganv_group_update;
+	item_class->realize   = ganv_group_realize;
+	item_class->unrealize = ganv_group_unrealize;
+	item_class->map       = ganv_group_map;
+	item_class->unmap     = ganv_group_unmap;
+	item_class->draw      = ganv_group_draw;
+	item_class->point     = ganv_group_point;
+	item_class->bounds    = ganv_group_bounds;
+}
diff --git a/src/item.c b/src/item.c
new file mode 100644
index 0000000..a458acd
--- /dev/null
+++ b/src/item.c
@@ -0,0 +1,707 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2016 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Based on GnomeCanvas, by Federico Mena <federico@nuclecu.unam.mx>
+ * and Raph Levien <raph@gimp.org>
+ * Copyright 1997-2000 Free Software Foundation
+ */
+
+#include "ganv/canvas.h"
+#include "ganv/node.h"
+
+#include "./boilerplate.h"
+#include "./ganv-marshal.h"
+#include "./ganv-private.h"
+#include "./gettext.h"
+
+/* All canvas items are derived from GanvItem.  The only information a GanvItem
+ * contains is its parent canvas, its parent canvas item, its bounding box in
+ * world coordinates, and its current affine transformation.
+ *
+ * Items inside a canvas are organized in a tree, where leaves are items
+ * without any children.  Each canvas has a single root item, which can be
+ * obtained with the ganv_canvas_base_get_root() function.
+ *
+ * The abstract GanvItem class does not have any configurable or queryable
+ * attributes.
+ */
+
+/* Update flags for items */
+enum {
+	GANV_CANVAS_UPDATE_REQUESTED  = 1 << 0,
+	GANV_CANVAS_UPDATE_AFFINE     = 1 << 1,
+	GANV_CANVAS_UPDATE_VISIBILITY = 1 << 2
+};
+
+#define GCI_UPDATE_MASK (GANV_CANVAS_UPDATE_REQUESTED \
+                         | GANV_CANVAS_UPDATE_AFFINE \
+                         | GANV_CANVAS_UPDATE_VISIBILITY)
+
+enum {
+	ITEM_PROP_0,
+	ITEM_PROP_PARENT,
+	ITEM_PROP_X,
+	ITEM_PROP_Y,
+	ITEM_PROP_MANAGED
+};
+
+enum {
+	ITEM_EVENT,
+	ITEM_LAST_SIGNAL
+};
+
+static guint item_signals[ITEM_LAST_SIGNAL];
+
+G_DEFINE_TYPE_WITH_CODE(GanvItem, ganv_item, GTK_TYPE_OBJECT,
+                        G_ADD_PRIVATE(GanvItem))
+
+static GtkObjectClass* item_parent_class;
+
+/* Object initialization function for GanvItem */
+static void
+ganv_item_init(GanvItem* item)
+{
+	GanvItemPrivate* impl = ganv_item_get_instance_private(item);
+
+	item->object.flags |= GANV_ITEM_VISIBLE;
+	item->impl          = impl;
+	item->impl->managed = FALSE;
+	item->impl->wrapper = NULL;
+}
+
+/**
+ * ganv_item_new:
+ * @parent: The parent group for the new item.
+ * @type: The object type of the item.
+ * @first_arg_name: A list of object argument name/value pairs, NULL-terminated,
+ * used to configure the item.  For example, "fill_color", "black",
+ * "width_units", 5.0, NULL.
+ * @...: first argument value, second argument name, second argument value, ...
+ *
+ * Creates a new canvas item with @parent as its parent group.  The item is
+ * created at the top of its parent's stack, and starts up as visible.  The item
+ * is of the specified @type, for example, it can be
+ * ganv_canvas_rect_get_type().  The list of object arguments/value pairs is
+ * used to configure the item. If you need to pass construct time parameters, you
+ * should use g_object_new() to pass the parameters and
+ * ganv_item_construct() to set up the canvas item.
+ *
+ * Return value: (transfer full): The newly-created item.
+ **/
+GanvItem*
+ganv_item_new(GanvItem* parent, GType type, const gchar* first_arg_name, ...)
+{
+	g_return_val_if_fail(g_type_is_a(type, ganv_item_get_type()), NULL);
+
+	GanvItem* item = GANV_ITEM(g_object_new(type, NULL));
+
+	va_list args;
+	va_start(args, first_arg_name);
+	ganv_item_construct(item, parent, first_arg_name, args);
+	va_end(args);
+
+	return item;
+}
+
+/* Performs post-creation operations on a canvas item (adding it to its parent
+ * group, etc.)
+ */
+static void
+item_post_create_setup(GanvItem* item)
+{
+	GanvItemClass* parent_class = GANV_ITEM_GET_CLASS(item->impl->parent);
+	if (!item->impl->managed) {
+		if (parent_class->add) {
+			parent_class->add(item->impl->parent, item);
+		} else {
+			g_warning("item added to non-parent item\n");
+		}
+	}
+	ganv_canvas_request_redraw_w(item->impl->canvas,
+	                             item->impl->x1, item->impl->y1,
+	                             item->impl->x2 + 1, item->impl->y2 + 1);
+	ganv_canvas_set_need_repick(item->impl->canvas);
+}
+
+static void
+ganv_item_set_property(GObject*      object,
+                       guint         prop_id,
+                       const GValue* value,
+                       GParamSpec*   pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_ITEM(object));
+
+	GanvItem* item = GANV_ITEM(object);
+
+	switch (prop_id) {
+	case ITEM_PROP_PARENT:
+		if (item->impl->parent != NULL) {
+			g_warning("Cannot set `parent' argument after item has "
+			          "already been constructed.");
+		} else if (g_value_get_object(value)) {
+			item->impl->parent = GANV_ITEM(g_value_get_object(value));
+			item->impl->canvas = item->impl->parent->impl->canvas;
+			item_post_create_setup(item);
+		}
+		break;
+	case ITEM_PROP_X:
+		item->impl->x = g_value_get_double(value);
+		ganv_item_request_update(item);
+		break;
+	case ITEM_PROP_Y:
+		item->impl->y = g_value_get_double(value);
+		ganv_item_request_update(item);
+		break;
+	case ITEM_PROP_MANAGED:
+		item->impl->managed = g_value_get_boolean(value);
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_item_get_property(GObject*    object,
+                       guint       prop_id,
+                       GValue*     value,
+                       GParamSpec* pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_ITEM(object));
+
+	GanvItem* item = GANV_ITEM(object);
+
+	switch (prop_id) {
+	case ITEM_PROP_PARENT:
+		g_value_set_object(value, item->impl->parent);
+		break;
+	case ITEM_PROP_X:
+		g_value_set_double(value, item->impl->x);
+		break;
+	case ITEM_PROP_Y:
+		g_value_set_double(value, item->impl->y);
+		break;
+	case ITEM_PROP_MANAGED:
+		g_value_set_boolean(value, item->impl->managed);
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+/**
+ * ganv_item_construct:
+ * @item: An unconstructed canvas item.
+ * @parent: The parent group for the item.
+ * @first_arg_name: The name of the first argument for configuring the item.
+ * @args: The list of arguments used to configure the item.
+ *
+ * Constructs a canvas item; meant for use only by item implementations.
+ **/
+void
+ganv_item_construct(GanvItem* item, GanvItem* parent,
+                    const gchar* first_arg_name, va_list args)
+{
+	g_return_if_fail(GANV_IS_ITEM(item));
+
+	item->impl->parent  = parent;
+	item->impl->wrapper = NULL;
+	item->impl->canvas  = item->impl->parent->impl->canvas;
+	item->impl->layer   = 0;
+
+	g_object_set_valist(G_OBJECT(item), first_arg_name, args);
+
+	item_post_create_setup(item);
+}
+
+/* If the item is visible, requests a redraw of it. */
+static void
+redraw_if_visible(GanvItem* item)
+{
+	if (item->object.flags & GANV_ITEM_VISIBLE) {
+		ganv_canvas_request_redraw_w(item->impl->canvas,
+		                             item->impl->x1, item->impl->y1,
+		                             item->impl->x2 + 1, item->impl->y2 + 1);
+	}
+}
+
+/* Standard object dispose function for canvas items */
+static void
+ganv_item_dispose(GObject* object)
+{
+	GanvItem* item;
+
+	g_return_if_fail(GANV_IS_ITEM(object));
+
+	item = GANV_ITEM(object);
+
+	if (item->impl->canvas) {
+		redraw_if_visible(item);
+		ganv_canvas_forget_item(item->impl->canvas, item);
+	}
+
+	/* Normal destroy stuff */
+
+	if (item->object.flags & GANV_ITEM_MAPPED) {
+		(*GANV_ITEM_GET_CLASS(item)->unmap)(item);
+	}
+
+	if (item->object.flags & GANV_ITEM_REALIZED) {
+		(*GANV_ITEM_GET_CLASS(item)->unrealize)(item);
+	}
+
+	if (!item->impl->managed && item->impl->parent) {
+		if (GANV_ITEM_GET_CLASS(item->impl->parent)->remove) {
+			GANV_ITEM_GET_CLASS(item->impl->parent)->remove(item->impl->parent, item);
+		} else {
+			fprintf(stderr, "warning: Item parent has no remove method\n");
+		}
+	}
+
+	G_OBJECT_CLASS(item_parent_class)->dispose(object);
+	/* items should remove any reference to item->impl->canvas after the
+	   first ::destroy */
+	item->impl->canvas = NULL;
+}
+
+/* Realize handler for canvas items */
+static void
+ganv_item_realize(GanvItem* item)
+{
+	GTK_OBJECT_SET_FLAGS(item, GANV_ITEM_REALIZED);
+
+	ganv_item_request_update(item);
+}
+
+/* Unrealize handler for canvas items */
+static void
+ganv_item_unrealize(GanvItem* item)
+{
+	GTK_OBJECT_UNSET_FLAGS(item, GANV_ITEM_REALIZED);
+}
+
+/* Map handler for canvas items */
+static void
+ganv_item_map(GanvItem* item)
+{
+	GTK_OBJECT_SET_FLAGS(item, GANV_ITEM_MAPPED);
+}
+
+/* Unmap handler for canvas items */
+static void
+ganv_item_unmap(GanvItem* item)
+{
+	GTK_OBJECT_UNSET_FLAGS(item, GANV_ITEM_MAPPED);
+}
+
+/* Update handler for canvas items */
+static void
+ganv_item_update(GanvItem* item, int flags)
+{
+	GTK_OBJECT_UNSET_FLAGS(item, GANV_ITEM_NEED_UPDATE);
+	GTK_OBJECT_UNSET_FLAGS(item, GANV_ITEM_NEED_VIS);
+}
+
+/* Point handler for canvas items */
+static double
+ganv_item_point(GanvItem* item, double x, double y, GanvItem** actual_item)
+{
+	*actual_item = NULL;
+	return G_MAXDOUBLE;
+}
+
+void
+ganv_item_invoke_update(GanvItem* item, int flags)
+{
+	int child_flags = flags;
+
+	/* apply object flags to child flags */
+
+	child_flags &= ~GANV_CANVAS_UPDATE_REQUESTED;
+
+	if (item->object.flags & GANV_ITEM_NEED_UPDATE) {
+		child_flags |= GANV_CANVAS_UPDATE_REQUESTED;
+	}
+
+	if (item->object.flags & GANV_ITEM_NEED_VIS) {
+		child_flags |= GANV_CANVAS_UPDATE_VISIBILITY;
+	}
+
+	if (child_flags & GCI_UPDATE_MASK) {
+		if (GANV_ITEM_GET_CLASS(item)->update) {
+			GANV_ITEM_GET_CLASS(item)->update(item, child_flags);
+			g_assert(!(GTK_OBJECT_FLAGS(item) & GANV_ITEM_NEED_UPDATE));
+		}
+	}
+}
+
+/**
+ * ganv_item_set:
+ * @item: A canvas item.
+ * @first_arg_name: The list of object argument name/value pairs used to configure the item.
+ * @...: first argument value, second argument name, second argument value, ...
+ *
+ * Configures a canvas item.  The arguments in the item are set to the specified
+ * values, and the item is repainted as appropriate.
+ **/
+void
+ganv_item_set(GanvItem* item, const gchar* first_arg_name, ...)
+{
+	va_list args;
+
+	va_start(args, first_arg_name);
+	ganv_item_set_valist(item, first_arg_name, args);
+	va_end(args);
+}
+
+/**
+ * ganv_item_set_valist:
+ * @item: A canvas item.
+ * @first_arg_name: The name of the first argument used to configure the item.
+ * @args: The list of object argument name/value pairs used to configure the item.
+ *
+ * Configures a canvas item.  The arguments in the item are set to the specified
+ * values, and the item is repainted as appropriate.
+ **/
+void
+ganv_item_set_valist(GanvItem* item, const gchar* first_arg_name, va_list args)
+{
+	g_return_if_fail(GANV_IS_ITEM(item));
+
+	g_object_set_valist(G_OBJECT(item), first_arg_name, args);
+
+	ganv_canvas_set_need_repick(item->impl->canvas);
+}
+
+GanvCanvas*
+ganv_item_get_canvas(GanvItem* item)
+{
+	return item->impl->canvas;
+}
+
+GanvItem*
+ganv_item_get_parent(GanvItem* item)
+{
+	return item->impl->parent;
+}
+
+void
+ganv_item_raise(GanvItem* item)
+{
+	++item->impl->layer;
+}
+
+void
+ganv_item_lower(GanvItem* item)
+{
+	--item->impl->layer;
+}
+
+/**
+ * ganv_item_move:
+ * @item: A canvas item.
+ * @dx: Horizontal offset.
+ * @dy: Vertical offset.
+ **/
+void
+ganv_item_move(GanvItem* item, double dx, double dy)
+{
+	if (!item || !GANV_IS_ITEM(item)) {
+		return;
+	}
+
+	item->impl->x += dx;
+	item->impl->y += dy;
+
+	ganv_item_request_update(item);
+	ganv_canvas_set_need_repick(item->impl->canvas);
+}
+
+/**
+ * ganv_item_show:
+ * @item: A canvas item.
+ *
+ * Shows a canvas item.  If the item was already shown, then no action is taken.
+ **/
+void
+ganv_item_show(GanvItem* item)
+{
+	g_return_if_fail(GANV_IS_ITEM(item));
+
+	if (!(item->object.flags & GANV_ITEM_VISIBLE)) {
+		item->object.flags |= GANV_ITEM_VISIBLE;
+		ganv_canvas_request_redraw_w(item->impl->canvas,
+		                             item->impl->x1, item->impl->y1,
+		                             item->impl->x2 + 1, item->impl->y2 + 1);
+		ganv_canvas_set_need_repick(item->impl->canvas);
+	}
+}
+
+/**
+ * ganv_item_hide:
+ * @item: A canvas item.
+ *
+ * Hides a canvas item.  If the item was already hidden, then no action is
+ * taken.
+ **/
+void
+ganv_item_hide(GanvItem* item)
+{
+	g_return_if_fail(GANV_IS_ITEM(item));
+
+	if (item->object.flags & GANV_ITEM_VISIBLE) {
+		item->object.flags &= ~GANV_ITEM_VISIBLE;
+		ganv_canvas_request_redraw_w(item->impl->canvas,
+		                             item->impl->x1, item->impl->y1,
+		                             item->impl->x2 + 1, item->impl->y2 + 1);
+		ganv_canvas_set_need_repick(item->impl->canvas);
+	}
+}
+
+void
+ganv_item_i2w_offset(GanvItem* item, double* px, double* py)
+{
+	double x = 0.0;
+	double y = 0.0;
+	while (item) {
+		x += item->impl->x;
+		y += item->impl->y;
+		item = item->impl->parent;
+	}
+	*px = x;
+	*py = y;
+}
+
+/**
+ * ganv_item_i2w:
+ * @item: A canvas item.
+ * @x: X coordinate to convert (input/output value).
+ * @y: Y coordinate to convert (input/output value).
+ *
+ * Converts a coordinate pair from item-relative coordinates to world
+ * coordinates.
+ **/
+void
+ganv_item_i2w(GanvItem* item, double* x, double* y)
+{
+	/*g_return_if_fail(GANV_IS_ITEM(item));
+	  g_return_if_fail(x != NULL);
+	  g_return_if_fail(y != NULL);*/
+
+	double off_x;
+	double off_y;
+	ganv_item_i2w_offset(item, &off_x, &off_y);
+
+	*x += off_x;
+	*y += off_y;
+}
+
+void
+ganv_item_i2w_pair(GanvItem* item, double* x1, double* y1, double* x2, double* y2)
+{
+	double off_x;
+	double off_y;
+	ganv_item_i2w_offset(item, &off_x, &off_y);
+
+	*x1 += off_x;
+	*y1 += off_y;
+	*x2 += off_x;
+	*y2 += off_y;
+}
+
+/**
+ * ganv_item_w2i:
+ * @item: A canvas item.
+ * @x: X coordinate to convert (input/output value).
+ * @y: Y coordinate to convert (input/output value).
+ *
+ * Converts a coordinate pair from world coordinates to item-relative
+ * coordinates.
+ **/
+void
+ganv_item_w2i(GanvItem* item, double* x, double* y)
+{
+	double off_x;
+	double off_y;
+	ganv_item_i2w_offset(item, &off_x, &off_y);
+
+	*x -= off_x;
+	*y -= off_y;
+}
+
+/**
+ * ganv_item_grab_focus:
+ * @item: A canvas item.
+ *
+ * Makes the specified item take the keyboard focus, so all keyboard events will
+ * be sent to it.  If the canvas widget itself did not have the focus, it grabs
+ * it as well.
+ **/
+void
+ganv_item_grab_focus(GanvItem* item)
+{
+	ganv_canvas_grab_focus(item->impl->canvas, item);
+}
+
+void
+ganv_item_emit_event(GanvItem* item, GdkEvent* event, gint* finished)
+{
+	g_signal_emit(item, item_signals[ITEM_EVENT], 0, event, finished);
+}
+
+static void
+ganv_item_default_bounds(GanvItem* item, double* x1, double* y1, double* x2, double* y2)
+{
+	*x1 = *y1 = *x2 = *y2 = 0.0;
+}
+
+/**
+ * ganv_item_get_bounds:
+ * @item: A canvas item.
+ * @x1: Leftmost edge of the bounding box (return value).
+ * @y1: Upper edge of the bounding box (return value).
+ * @x2: Rightmost edge of the bounding box (return value).
+ * @y2: Lower edge of the bounding box (return value).
+ *
+ * Queries the bounding box of a canvas item.  The bounding box may not be
+ * exactly tight, but the canvas items will do the best they can.  The bounds
+ * are returned in the coordinate system of the item's parent.
+ **/
+void
+ganv_item_get_bounds(GanvItem* item, double* x1, double* y1, double* x2, double* y2)
+{
+	GANV_ITEM_GET_CLASS(item)->bounds(item, x1, y1, x2, y2);
+}
+
+/**
+ * ganv_item_request_update:
+ * @item: A canvas item.
+ *
+ * To be used only by item implementations.  Requests that the canvas queue an
+ * update for the specified item.
+ **/
+void
+ganv_item_request_update(GanvItem* item)
+{
+	if (!item->impl->canvas) {
+		/* Item is being / has been destroyed, ignore */
+		return;
+	}
+
+	item->object.flags |= GANV_ITEM_NEED_UPDATE;
+
+	if (item->impl->parent != NULL &&
+	    !(item->impl->parent->object.flags & GANV_ITEM_NEED_UPDATE)) {
+		/* Recurse up the tree */
+		ganv_item_request_update(item->impl->parent);
+	} else {
+		/* Have reached the top of the tree, make sure the update call gets scheduled. */
+		ganv_canvas_request_update(item->impl->canvas);
+	}
+}
+
+void
+ganv_item_set_wrapper(GanvItem* item, void* wrapper)
+{
+	item->impl->wrapper = wrapper;
+}
+
+void*
+ganv_item_get_wrapper(GanvItem* item)
+{
+	return item->impl->wrapper;
+}
+
+static gboolean
+boolean_handled_accumulator(GSignalInvocationHint* ihint,
+                            GValue*                return_accu,
+                            const GValue*          handler_return,
+                            gpointer               dummy)
+{
+	gboolean continue_emission;
+	gboolean signal_handled;
+
+	signal_handled = g_value_get_boolean(handler_return);
+	g_value_set_boolean(return_accu, signal_handled);
+	continue_emission = !signal_handled;
+
+	return continue_emission;
+}
+
+/* Class initialization function for GanvItemClass */
+static void
+ganv_item_class_init(GanvItemClass* klass)
+{
+	GObjectClass* gobject_class;
+
+	gobject_class = (GObjectClass*)klass;
+
+	item_parent_class = (GtkObjectClass*)g_type_class_peek_parent(klass);
+
+	gobject_class->set_property = ganv_item_set_property;
+	gobject_class->get_property = ganv_item_get_property;
+
+	g_object_class_install_property
+		(gobject_class, ITEM_PROP_PARENT,
+		 g_param_spec_object("parent", NULL, NULL,
+		                     GANV_TYPE_ITEM,
+		                     (GParamFlags)(G_PARAM_READABLE | G_PARAM_WRITABLE)));
+
+	g_object_class_install_property
+		(gobject_class, ITEM_PROP_X,
+		 g_param_spec_double("x",
+		                     _("X"),
+		                     _("X"),
+		                     -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+		                     (GParamFlags)(G_PARAM_READABLE | G_PARAM_WRITABLE)));
+	g_object_class_install_property
+		(gobject_class, ITEM_PROP_Y,
+		 g_param_spec_double("y",
+		                     _("Y"),
+		                     _("Y"),
+		                     -G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+		                     (GParamFlags)(G_PARAM_READABLE | G_PARAM_WRITABLE)));
+
+	g_object_class_install_property
+		(gobject_class, ITEM_PROP_MANAGED,
+		 g_param_spec_boolean("managed",
+		                      _("Managed"),
+		                      _("Whether the item is managed by its parent"),
+		                      0,
+		                      (GParamFlags)(G_PARAM_READABLE | G_PARAM_WRITABLE)));
+
+	item_signals[ITEM_EVENT]
+		= g_signal_new("event",
+		               G_TYPE_FROM_CLASS(klass),
+		               G_SIGNAL_RUN_LAST,
+		               G_STRUCT_OFFSET(GanvItemClass, event),
+		               boolean_handled_accumulator, NULL,
+		               ganv_marshal_BOOLEAN__BOXED,
+		               G_TYPE_BOOLEAN, 1,
+		               GDK_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE);
+
+	gobject_class->dispose = ganv_item_dispose;
+
+	klass->realize   = ganv_item_realize;
+	klass->unrealize = ganv_item_unrealize;
+	klass->map       = ganv_item_map;
+	klass->unmap     = ganv_item_unmap;
+	klass->update    = ganv_item_update;
+	klass->point     = ganv_item_point;
+	klass->bounds    = ganv_item_default_bounds;
+}
diff --git a/src/module.c b/src/module.c
new file mode 100644
index 0000000..bad930b
--- /dev/null
+++ b/src/module.c
@@ -0,0 +1,859 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2016 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "ganv/canvas.h"
+#include "ganv/module.h"
+#include "ganv/port.h"
+#include "ganv/widget.h"
+
+#include "./color.h"
+#include "./boilerplate.h"
+#include "./gettext.h"
+#include "./ganv-private.h"
+
+#define FOREACH_PORT(ports, i) \
+	for (GanvPort** i = (GanvPort**)ports->pdata; \
+	     i != (GanvPort**)ports->pdata + ports->len; ++i)
+
+#define FOREACH_PORT_CONST(ports, i) \
+	for (const GanvPort** i = (const GanvPort**)ports->pdata; \
+	     i != (const GanvPort**)ports->pdata + ports->len; ++i)
+
+static const double PAD              = 2.0;
+static const double EDGE_PAD         = 5.0;
+static const double MODULE_LABEL_PAD = 2.0;
+
+G_DEFINE_TYPE_WITH_CODE(GanvModule, ganv_module, GANV_TYPE_BOX,
+                        G_ADD_PRIVATE(GanvModule))
+
+static GanvBoxClass* parent_class;
+
+enum {
+	PROP_0
+};
+
+static void
+ganv_module_init(GanvModule* module)
+{
+	GanvModulePrivate* impl = ganv_module_get_instance_private(module);
+
+	module->impl = impl;
+
+	GANV_NODE(module)->impl->can_head = FALSE;
+	GANV_NODE(module)->impl->can_tail = FALSE;
+
+	impl->ports = g_ptr_array_new();
+	impl->embed_item    = NULL;
+	impl->embed_width   = 0;
+	impl->embed_height  = 0;
+	impl->widest_input  = 0.0;
+	impl->widest_output = 0.0;
+	impl->must_reorder  = FALSE;
+}
+
+static void
+ganv_module_destroy(GtkObject* object)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_MODULE(object));
+
+	GanvModule*        module = GANV_MODULE(object);
+	GanvModulePrivate* impl   = module->impl;
+
+	if (impl->ports) {
+		FOREACH_PORT(impl->ports, p) {
+			g_object_unref(GTK_OBJECT(*p));
+		}
+		g_ptr_array_free(impl->ports, TRUE);
+		impl->ports = NULL;
+	}
+
+	if (impl->embed_item) {
+		g_object_unref(GTK_OBJECT(impl->embed_item));
+		impl->embed_item = NULL;
+	}
+
+	if (GTK_OBJECT_CLASS(parent_class)->destroy) {
+		(*GTK_OBJECT_CLASS(parent_class)->destroy)(object);
+	}
+}
+
+static void
+ganv_module_set_property(GObject*      object,
+                         guint         prop_id,
+                         const GValue* value,
+                         GParamSpec*   pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_MODULE(object));
+
+	switch (prop_id) {
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_module_get_property(GObject*    object,
+                         guint       prop_id,
+                         GValue*     value,
+                         GParamSpec* pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_MODULE(object));
+
+	switch (prop_id) {
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+typedef struct {
+	double   embed_x;
+	double   width;
+	double   input_width;
+	double   output_width;
+	gboolean horiz;
+	gboolean embed_between;
+} Metrics;
+
+static void
+title_size(GanvModule* module, double* w, double* h)
+{
+	if (module->box.node.impl->label) {
+		g_object_get(G_OBJECT(module->box.node.impl->label),
+		             "width", w,
+		             "height", h,
+		             NULL);
+	} else {
+		*w = *h = 0.0;
+	}
+}
+
+static void
+measure(GanvModule* module, Metrics* m)
+{
+	memset(m, '\0', sizeof(Metrics));
+
+	double title_w, title_h;
+	title_size(module, &title_w, &title_h);
+
+	GanvCanvas*        canvas       = ganv_item_get_canvas(GANV_ITEM(module));
+	GanvText*          canvas_title = GANV_NODE(module)->impl->label;
+	GanvModulePrivate* impl         = module->impl;
+
+	if (ganv_canvas_get_direction(canvas) == GANV_DIRECTION_DOWN) {
+		double contents_width = 0.0;
+		if (canvas_title) {
+			contents_width += title_w + (2.0 * PAD);
+		}
+
+		m->embed_x      = 0;
+		m->input_width  = ganv_module_get_empty_port_breadth(module);
+		m->output_width = ganv_module_get_empty_port_breadth(module);
+
+		// TODO: cache this or merge with resize_right
+		unsigned n_inputs  = 0;
+		unsigned n_outputs = 0;
+		FOREACH_PORT(impl->ports, pi) {
+			if ((*pi)->impl->is_input) {
+				++n_inputs;
+			} else {
+				++n_outputs;
+			}
+		}
+
+		const unsigned hor_ports = MAX(1, MAX(n_inputs, n_outputs));
+		const double ports_width = (2 * EDGE_PAD) +
+			((m->input_width) * hor_ports) +
+			((PAD + 1.0) * (hor_ports - 1));
+
+		m->width = MAX(contents_width, ports_width);
+		m->width = MAX(m->width, impl->embed_width);
+
+		if (impl->embed_item) {
+			m->width   = MAX(impl->embed_width + 2.0 * PAD, m->width);
+			m->embed_x = PAD;
+		}
+		return;
+	}
+
+	// The amount of space between a port edge and the module edge (on the
+	// side that the port isn't right on the edge).
+	const double hor_pad = (canvas_title ? 10.0 : 20.0);
+
+	m->width = (canvas_title) ? title_w + 10.0 : 1.0;
+
+	// Title is wide or there is an embedded widget,
+	// put inputs and outputs beside each other
+	m->horiz = (impl->embed_item ||
+	            (impl->widest_input + impl->widest_output + 10.0
+	             < MAX(m->width, impl->embed_width)));
+
+	// Fit ports to module (or vice-versa)
+	m->input_width  = impl->widest_input;
+	m->output_width = impl->widest_output;
+	double expand_w = (m->horiz ? (m->width / 2.0) : m->width) - hor_pad;
+	if (!impl->embed_item) {
+		m->input_width  = MAX(impl->widest_input,  expand_w);
+		m->output_width = MAX(impl->widest_output, expand_w);
+	}
+
+	const double widest = MAX(m->input_width, m->output_width);
+
+	if (impl->embed_item) {
+		double above_w   = MAX(m->width, widest + hor_pad);
+		double between_w = MAX(m->width,
+		                       (m->input_width
+		                        + m->output_width
+		                        + impl->embed_width));
+
+		above_w = MAX(above_w, impl->embed_width);
+
+		// Decide where to place embedded widget if necessary)
+		if (impl->embed_width < impl->embed_height * 2.0) {
+			m->embed_between = TRUE;
+			m->width         = between_w;
+			m->embed_x       = m->input_width;
+		} else {
+			m->width   = above_w;
+			m->embed_x = 2.0;
+		}
+	}
+
+	if (!canvas_title && (impl->widest_input == 0.0
+	                      || impl->widest_output == 0.0)) {
+		m->width += 10.0;
+	}
+
+	m->width += 4.0;
+	m->width = MAX(m->width, widest + hor_pad);
+}
+
+static void
+place_title(GanvModule* module, GanvDirection dir)
+{
+	GanvBox*  box          = GANV_BOX(module);
+	GanvText* canvas_title = GANV_NODE(module)->impl->label;
+
+	double title_w, title_h;
+	title_size(module, &title_w, &title_h);
+
+	if (!canvas_title) {
+		return;
+	}
+
+	GanvItem* t = GANV_ITEM(canvas_title);
+	if (dir == GANV_DIRECTION_RIGHT) {
+		t->impl->x = (ganv_box_get_width(box) - title_w) / 2.0;
+		t->impl->y = 1.0;
+	} else {
+		t->impl->x = (ganv_box_get_width(box) - title_w) / 2.0;
+		t->impl->y = ganv_module_get_empty_port_depth(module) + 1.0;
+	}
+}
+
+static void
+resize_right(GanvModule* module)
+{
+	GanvCanvas*        canvas = ganv_item_get_canvas(GANV_ITEM(module));
+	GanvModulePrivate* impl   = module->impl;
+
+	Metrics m;
+	measure(module, &m);
+
+	double title_w, title_h;
+	title_size(module, &title_w, &title_h);
+
+	// Basic height contains title
+	double header_height = title_h ? (3.0 + title_h) : EDGE_PAD;
+
+	if (impl->embed_item) {
+		ganv_item_set(impl->embed_item,
+		              "x", (double)m.embed_x,
+		              "y", header_height,
+		              NULL);
+	}
+
+	// Actually set width and height
+	ganv_box_set_width(GANV_BOX(module), m.width);
+
+	// Offset ports below embedded widget
+	if (!m.embed_between) {
+		header_height += impl->embed_height;
+	}
+
+	// Move ports to appropriate locations
+	double   in_y           = header_height;
+	double   out_y          = header_height;
+	FOREACH_PORT(impl->ports, pi) {
+		GanvPort* const p     = (*pi);
+		GanvBox*  const pbox  = GANV_BOX(p);
+		GanvNode* const pnode = GANV_NODE(p);
+		const double    h     = ganv_box_get_height(pbox);
+
+		// Offset to shift ports to make borders line up
+		const double border_off = (GANV_NODE(module)->impl->border_width -
+		                           pnode->impl->border_width) / 2.0;
+
+		if (p->impl->is_input) {
+			ganv_node_move_to(pnode, -border_off, in_y + 1.0);
+			ganv_box_set_width(pbox, m.input_width);
+			in_y += h + pnode->impl->border_width + 1.0;
+
+			ganv_canvas_for_each_edge_to(
+				canvas, pnode,
+				(GanvEdgeFunc)ganv_edge_update_location, NULL);
+		} else {
+			ganv_node_move_to(pnode, m.width - m.output_width + border_off, out_y + 1.0);
+			ganv_box_set_width(pbox, m.output_width);
+			out_y += h + pnode->impl->border_width + 1.0;
+
+			ganv_canvas_for_each_edge_from(
+				canvas, pnode,
+				(GanvEdgeFunc)ganv_edge_update_location, NULL);
+		}
+
+		if (!m.horiz) {
+			in_y  = MAX(in_y, out_y);
+			out_y = MAX(in_y, out_y);
+		}
+	}
+
+	double height = MAX(in_y, out_y) + EDGE_PAD;
+	if (impl->embed_item && m.embed_between)
+		height = MAX(height, impl->embed_height + header_height + 2.0);
+
+	ganv_box_set_height(GANV_BOX(module), height);
+
+	place_title(module, GANV_DIRECTION_RIGHT);
+}
+
+static void
+resize_down(GanvModule* module)
+{
+	GanvCanvas*        canvas = ganv_item_get_canvas(GANV_ITEM(module));
+	GanvModulePrivate* impl   = module->impl;
+
+	Metrics m;
+	measure(module, &m);
+
+	double title_w, title_h;
+	title_size(module, &title_w, &title_h);
+
+	const double port_depth   = ganv_module_get_empty_port_depth(module);
+	const double port_breadth = ganv_module_get_empty_port_breadth(module);
+
+	if (impl->embed_item) {
+		ganv_item_set(impl->embed_item,
+		              "x", (double)m.embed_x,
+		              "y", port_depth + title_h,
+		              NULL);
+	}
+
+	const double height = PAD + title_h
+		+ impl->embed_height + (port_depth * 2.0);
+
+	// Move ports to appropriate locations
+	guint  in_count  = 0;
+	guint  out_count = 0;
+	double in_x      = 0.0;
+	double out_x     = 0.0;
+	FOREACH_PORT(impl->ports, pi) {
+		GanvPort* const p     = (*pi);
+		GanvBox*  const pbox  = GANV_BOX(p);
+		GanvNode* const pnode = GANV_NODE(p);
+		ganv_box_set_width(pbox, port_breadth);
+		ganv_box_set_height(pbox, port_depth);
+
+		// Offset to shift ports to make borders line up
+		const double border_off = (GANV_NODE(module)->impl->border_width -
+		                           pnode->impl->border_width) / 2.0;
+
+		if (p->impl->is_input) {
+			in_x = EDGE_PAD + (in_count++ * (port_breadth + PAD + 1.0));
+			ganv_node_move_to(pnode, in_x, -border_off);
+			ganv_canvas_for_each_edge_to(
+				canvas, pnode,
+				(GanvEdgeFunc)ganv_edge_update_location, NULL);
+		} else {
+			out_x = EDGE_PAD + (out_count++ * (port_breadth + PAD + 1.0));
+			ganv_node_move_to(pnode, out_x, height - port_depth + border_off);
+			ganv_canvas_for_each_edge_from(
+				canvas, pnode,
+				(GanvEdgeFunc)ganv_edge_update_location, NULL);
+		}
+	}
+
+	ganv_box_set_height(GANV_BOX(module), height);
+	ganv_box_set_width(GANV_BOX(module), m.width);
+	place_title(module, GANV_DIRECTION_DOWN);
+}
+
+static void
+measure_ports(GanvModule* module)
+{
+	GanvModulePrivate* impl = module->impl;
+
+	impl->widest_input  = 0.0;
+	impl->widest_output = 0.0;
+	FOREACH_PORT_CONST(impl->ports, pi) {
+		const GanvPort* const p = (*pi);
+		const double          w = ganv_port_get_natural_width(p);
+		if (p->impl->is_input) {
+			if (w > impl->widest_input) {
+				impl->widest_input = w;
+			}
+		} else {
+			if (w > impl->widest_output) {
+				impl->widest_output = w;
+			}
+		}
+	}
+}
+
+static void
+ganv_module_resize(GanvNode* self)
+{
+	GanvModule* module = GANV_MODULE(self);
+	GanvNode*   node   = GANV_NODE(self);
+	GanvCanvas* canvas = ganv_item_get_canvas(GANV_ITEM(module));
+
+	double label_w = 0.0;
+	double label_h = 0.0;
+	if (node->impl->label) {
+		g_object_get(node->impl->label,
+		             "width", &label_w,
+		             "height", &label_h,
+		             NULL);
+	}
+
+	measure_ports(module);
+
+	ganv_box_set_width(GANV_BOX(module), label_w + (MODULE_LABEL_PAD * 2.0));
+	ganv_box_set_height(GANV_BOX(module), label_h);
+
+	switch (ganv_canvas_get_direction(canvas)) {
+	case GANV_DIRECTION_RIGHT:
+		resize_right(module);
+		break;
+	case GANV_DIRECTION_DOWN:
+		resize_down(module);
+		break;
+	}
+
+	if (GANV_NODE_CLASS(parent_class)->resize) {
+		GANV_NODE_CLASS(parent_class)->resize(self);
+	}
+}
+
+static void
+ganv_module_redraw_text(GanvNode* self)
+{
+	FOREACH_PORT(GANV_MODULE(self)->impl->ports, p) {
+		ganv_node_redraw_text(GANV_NODE(*p));
+	}
+
+	if (parent_class->parent_class.redraw_text) {
+		parent_class->parent_class.redraw_text(self);
+	}
+}
+
+static void
+ganv_module_add_port(GanvModule* module,
+                     GanvPort*   port)
+{
+	GanvModulePrivate* impl = module->impl;
+
+	// Update widest input/output measurements if necessary
+	const double width = ganv_port_get_natural_width(port);
+	if (port->impl->is_input && width > impl->widest_input) {
+		impl->widest_input = width;
+	} else if (!port->impl->is_input && width > impl->widest_output) {
+		impl->widest_output = width;
+	}
+
+	// Add to port array
+	g_ptr_array_add(impl->ports, port);
+
+	// Request update with resize and reorder
+	GANV_NODE(module)->impl->must_resize = TRUE;
+	impl->must_reorder                   = TRUE;
+}
+
+static void
+ganv_module_remove_port(GanvModule* module,
+                        GanvPort*   port)
+{
+	gboolean removed = g_ptr_array_remove(module->impl->ports, port);
+	if (removed) {
+		const double width = ganv_box_get_width(GANV_BOX(port));
+		// Find new widest input or output, if necessary
+		if (port->impl->is_input && width >= module->impl->widest_input) {
+			module->impl->widest_input = 0;
+			FOREACH_PORT_CONST(module->impl->ports, i) {
+				const GanvPort* const p = (*i);
+				const double          w = ganv_box_get_width(GANV_BOX(p));
+				if (p->impl->is_input && w >= module->impl->widest_input) {
+					module->impl->widest_input = w;
+				}
+			}
+		} else if (!port->impl->is_input && width >= module->impl->widest_output) {
+			module->impl->widest_output = 0;
+			FOREACH_PORT_CONST(module->impl->ports, i) {
+				const GanvPort* const p = (*i);
+				const double          w = ganv_box_get_width(GANV_BOX(p));
+				if (!p->impl->is_input && w >= module->impl->widest_output) {
+					module->impl->widest_output = w;
+				}
+			}
+		}
+
+		GANV_NODE(module)->impl->must_resize = TRUE;
+	} else {
+		fprintf(stderr, "Failed to find port to remove\n");
+	}
+}
+
+static void
+ganv_module_add(GanvItem* item, GanvItem* child)
+{
+	if (GANV_IS_PORT(child)) {
+		ganv_module_add_port(GANV_MODULE(item), GANV_PORT(child));
+	}
+	ganv_item_request_update(item);
+	if (GANV_ITEM_CLASS(parent_class)->add) {
+		GANV_ITEM_CLASS(parent_class)->add(item, child);
+	}
+}
+
+static void
+ganv_module_remove(GanvItem* item, GanvItem* child)
+{
+	if (GANV_IS_PORT(child)) {
+		ganv_module_remove_port(GANV_MODULE(item), GANV_PORT(child));
+	}
+	ganv_item_request_update(item);
+	if (GANV_ITEM_CLASS(parent_class)->remove) {
+		GANV_ITEM_CLASS(parent_class)->remove(item, child);
+	}
+}
+
+static int
+ptr_sort(const GanvPort** a, const GanvPort** b, const PortOrderCtx* ctx)
+{
+	return ctx->port_cmp(*a, *b, ctx->data);
+}
+
+static void
+ganv_module_update(GanvItem* item, int flags)
+{
+	GanvModule* module = GANV_MODULE(item);
+	GanvCanvas* canvas = ganv_item_get_canvas(item);
+
+	if (module->impl->must_reorder) {
+		// Sort ports array
+		PortOrderCtx ctx = ganv_canvas_get_port_order(canvas);
+		if (ctx.port_cmp) {
+			g_ptr_array_sort_with_data(module->impl->ports,
+			                           (GCompareDataFunc)ptr_sort,
+
+			                           &ctx);
+		}
+		module->impl->must_reorder = FALSE;
+	}
+
+	if (module->impl->embed_item) {
+		// Kick the embedded item to update position if we have moved
+		ganv_item_move(GANV_ITEM(module->impl->embed_item), 0.0, 0.0);
+	}
+
+	FOREACH_PORT(module->impl->ports, p) {
+		ganv_item_invoke_update(GANV_ITEM(*p), flags);
+	}
+
+	if (module->impl->embed_item) {
+		ganv_item_invoke_update(GANV_ITEM(module->impl->embed_item), flags);
+	}
+
+	GANV_ITEM_CLASS(parent_class)->update(item, flags);
+}
+
+static void
+ganv_module_draw(GanvItem* item,
+                 cairo_t* cr, double cx, double cy, double cw, double ch)
+{
+	GanvNode*   node   = GANV_NODE(item);
+	GanvModule* module = GANV_MODULE(item);
+
+	// Draw box
+	if (GANV_ITEM_CLASS(parent_class)->draw) {
+		(*GANV_ITEM_CLASS(parent_class)->draw)(item, cr, cx, cy, cw, ch);
+	}
+
+	// Draw label
+	if (node->impl->label) {
+		GanvItem* label_item = GANV_ITEM(node->impl->label);
+		GANV_ITEM_GET_CLASS(label_item)->draw(label_item, cr, cx, cy, cw, ch);
+	}
+
+	// Draw ports
+	FOREACH_PORT(module->impl->ports, p) {
+		GANV_ITEM_GET_CLASS(GANV_ITEM(*p))->draw(
+			GANV_ITEM(*p), cr, cx, cy, cw, ch);
+	}
+
+	// Draw embed item
+	if (module->impl->embed_item) {
+		GANV_ITEM_GET_CLASS(module->impl->embed_item)->draw(
+			module->impl->embed_item, cr, cx, cy, cw, ch);
+	}
+}
+
+static void
+ganv_module_move_to(GanvNode* node,
+                    double    x,
+                    double    y)
+{
+	GanvModule* module = GANV_MODULE(node);
+	GANV_NODE_CLASS(parent_class)->move_to(node, x, y);
+	FOREACH_PORT(module->impl->ports, p) {
+		ganv_node_move(GANV_NODE(*p), 0.0, 0.0);
+	}
+	if (module->impl->embed_item) {
+		ganv_item_move(GANV_ITEM(module->impl->embed_item), 0.0, 0.0);
+	}
+}
+
+static void
+ganv_module_move(GanvNode* node,
+                 double    dx,
+                 double    dy)
+{
+	GanvModule* module = GANV_MODULE(node);
+	GANV_NODE_CLASS(parent_class)->move(node, dx, dy);
+	FOREACH_PORT(module->impl->ports, p) {
+		ganv_node_move(GANV_NODE(*p), 0.0, 0.0);
+	}
+	if (module->impl->embed_item) {
+		ganv_item_move(GANV_ITEM(module->impl->embed_item), 0.0, 0.0);
+	}
+}
+
+static double
+ganv_module_point(GanvItem* item, double x, double y, GanvItem** actual_item)
+{
+	GanvModule* module = GANV_MODULE(item);
+
+	double d = GANV_ITEM_CLASS(parent_class)->point(item, x, y, actual_item);
+
+	if (!*actual_item) {
+		// Point is not inside module at all, no point in checking children
+		return d;
+	}
+
+	FOREACH_PORT(module->impl->ports, p) {
+		GanvItem* const port = GANV_ITEM(*p);
+
+		*actual_item = NULL;
+		d = GANV_ITEM_GET_CLASS(port)->point(
+			port, x - port->impl->x, y - port->impl->y, actual_item);
+
+		if (*actual_item) {
+			// Point is inside a port
+			return d;
+		}
+	}
+
+	// Point is inside module, but not a child port
+	*actual_item = item;
+	return 0.0;
+}
+
+static void
+ganv_module_class_init(GanvModuleClass* klass)
+{
+	GObjectClass*   gobject_class = (GObjectClass*)klass;
+	GtkObjectClass* object_class  = (GtkObjectClass*)klass;
+	GanvItemClass*  item_class    = (GanvItemClass*)klass;
+	GanvNodeClass*  node_class    = (GanvNodeClass*)klass;
+
+	parent_class = GANV_BOX_CLASS(g_type_class_peek_parent(klass));
+
+	gobject_class->set_property = ganv_module_set_property;
+	gobject_class->get_property = ganv_module_get_property;
+
+	object_class->destroy = ganv_module_destroy;
+
+	item_class->add    = ganv_module_add;
+	item_class->remove = ganv_module_remove;
+	item_class->update = ganv_module_update;
+	item_class->draw   = ganv_module_draw;
+	item_class->point  = ganv_module_point;
+
+	node_class->move        = ganv_module_move;
+	node_class->move_to     = ganv_module_move_to;
+	node_class->resize      = ganv_module_resize;
+	node_class->redraw_text = ganv_module_redraw_text;
+}
+
+GanvModule*
+ganv_module_new(GanvCanvas* canvas,
+                const char* first_property_name, ...)
+{
+	GanvModule* module = GANV_MODULE(
+		g_object_new(ganv_module_get_type(), "canvas", canvas, NULL));
+
+	va_list args;
+	va_start(args, first_property_name);
+	g_object_set_valist(G_OBJECT(module), first_property_name, args);
+	va_end(args);
+
+	return module;
+}
+
+guint
+ganv_module_num_ports(const GanvModule* module)
+{
+	return module->impl->ports ? module->impl->ports->len : 0;
+}
+
+GanvPort*
+ganv_module_get_port(GanvModule* module,
+                     guint       index)
+{
+	return (GanvPort*)g_ptr_array_index(module->impl->ports, index);
+}
+
+double
+ganv_module_get_empty_port_breadth(const GanvModule* module)
+{
+	return ganv_module_get_empty_port_depth(module) * 2.0;
+}
+
+double
+ganv_module_get_empty_port_depth(const GanvModule* module)
+{
+	GanvCanvas* canvas = ganv_item_get_canvas(GANV_ITEM(module));
+
+	return ganv_canvas_get_font_size(canvas) * 1.1;
+}
+
+static void
+on_embed_size_request(GtkWidget*      widget,
+                      GtkRequisition* r,
+                      void*           user_data)
+{
+	GanvModule*        module = GANV_MODULE(user_data);
+	GanvModulePrivate* impl   = module->impl;
+	if (impl->embed_width == r->width && impl->embed_height == r->height) {
+		return;
+	}
+
+	impl->embed_width                    = r->width;
+	impl->embed_height                   = r->height;
+	GANV_NODE(module)->impl->must_resize = TRUE;
+
+	GtkAllocation allocation;
+	allocation.width = r->width;
+	allocation.height = r->width;
+
+	gtk_widget_size_allocate(widget, &allocation);
+	ganv_item_set(impl->embed_item,
+	              "width", (double)r->width,
+	              "height", (double)r->height,
+	              NULL);
+}
+
+void
+ganv_module_embed(GanvModule* module,
+                  GtkWidget*  widget)
+{
+	GanvModulePrivate* impl = module->impl;
+	if (!widget && !impl->embed_item) {
+		return;
+	}
+
+	if (impl->embed_item) {
+		// Free existing embedded widget
+		gtk_object_destroy(GTK_OBJECT(impl->embed_item));
+		impl->embed_item = NULL;
+	}
+
+	if (!widget) {
+		// Removing an existing embedded widget
+		impl->embed_width                    = 0;
+		impl->embed_height                   = 0;
+		GANV_NODE(module)->impl->must_resize = TRUE;
+		ganv_item_request_update(GANV_ITEM(module));
+		return;
+	}
+
+	double title_w, title_h;
+	title_size(module, &title_w, &title_h);
+
+	impl->embed_item = ganv_item_new(
+		GANV_ITEM(module),
+		ganv_widget_get_type(),
+		"x", 2.0,
+		"y", 4.0 + title_h,
+		"widget", widget,
+		NULL);
+
+	GtkRequisition r;
+	gtk_widget_show_all(widget);
+	gtk_widget_size_request(widget, &r);
+	on_embed_size_request(widget, &r, module);
+	ganv_item_show(impl->embed_item);
+
+	g_signal_connect(widget, "size-request",
+	                 G_CALLBACK(on_embed_size_request), module);
+
+	GANV_NODE(module)->impl->must_resize = TRUE;
+	ganv_item_request_update(GANV_ITEM(module));
+}
+
+void
+ganv_module_set_direction(GanvModule*   module,
+                          GanvDirection direction)
+{
+	FOREACH_PORT(module->impl->ports, p) {
+		ganv_port_set_direction(*p, direction);
+	}
+	GANV_NODE(module)->impl->must_resize = TRUE;
+	ganv_item_request_update(GANV_ITEM(module));
+}
+
+void
+ganv_module_for_each_port(GanvModule*  module,
+                          GanvPortFunc f,
+                          void*        data)
+{
+	GanvModulePrivate* impl = module->impl;
+	const int          len  = impl->ports->len;
+	GanvPort**         copy = (GanvPort**)malloc(sizeof(GanvPort*) * len);
+	memcpy(copy, impl->ports->pdata, sizeof(GanvPort*) * len);
+
+	for (int i = 0; i < len; ++i) {
+		f(copy[i], data);
+	}
+
+	free(copy);
+}
diff --git a/src/node.c b/src/node.c
new file mode 100644
index 0000000..4955f36
--- /dev/null
+++ b/src/node.c
@@ -0,0 +1,897 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2016 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "ganv/canvas.h"
+#include "ganv/node.h"
+
+#include "./boilerplate.h"
+#include "./color.h"
+#include "./ganv-marshal.h"
+#include "./ganv-private.h"
+#include "./gettext.h"
+
+guint signal_moved;
+
+G_DEFINE_TYPE_WITH_CODE(GanvNode, ganv_node, GANV_TYPE_ITEM,
+                        G_ADD_PRIVATE(GanvNode))
+
+static GanvItemClass* parent_class;
+
+enum {
+	PROP_0,
+	PROP_CANVAS,
+	PROP_PARTNER,
+	PROP_LABEL,
+	PROP_SHOW_LABEL,
+	PROP_DASH_LENGTH,
+	PROP_DASH_OFFSET,
+	PROP_BORDER_WIDTH,
+	PROP_FILL_COLOR,
+	PROP_BORDER_COLOR,
+	PROP_CAN_TAIL,
+	PROP_CAN_HEAD,
+	PROP_IS_SOURCE,
+	PROP_SELECTED,
+	PROP_HIGHLIGHTED,
+	PROP_DRAGGABLE,
+	PROP_GRABBED
+};
+
+static void
+ganv_node_init(GanvNode* node)
+{
+	GanvNodePrivate* impl = ganv_node_get_instance_private(node);
+
+	node->impl = impl;
+
+	impl->partner      = NULL;
+	impl->label        = NULL;
+	impl->dash_length  = 0.0;
+	impl->dash_offset  = 0.0;
+	impl->border_width = 2.0;
+	impl->fill_color   = DEFAULT_FILL_COLOR;
+	impl->border_color = DEFAULT_BORDER_COLOR;
+	impl->can_tail     = FALSE;
+	impl->can_head     = FALSE;
+	impl->is_source    = FALSE;
+	impl->selected     = FALSE;
+	impl->highlighted  = FALSE;
+	impl->draggable    = FALSE;
+	impl->show_label   = TRUE;
+	impl->grabbed      = FALSE;
+	impl->must_resize  = FALSE;
+#ifdef GANV_FDGL
+	impl->force.x       = 0.0;
+	impl->force.y       = 0.0;
+	impl->vel.x         = 0.0;
+	impl->vel.y         = 0.0;
+	impl->connected     = FALSE;
+#endif
+}
+
+static void
+ganv_node_realize(GanvItem* item)
+{
+	GANV_ITEM_CLASS(parent_class)->realize(item);
+	ganv_canvas_add_node(ganv_item_get_canvas(item), GANV_NODE(item));
+}
+
+static void
+ganv_node_destroy(GtkObject* object)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_NODE(object));
+
+	GanvNode*        node = GANV_NODE(object);
+	GanvNodePrivate* impl = node->impl;
+	if (impl->label) {
+		g_object_unref(impl->label);
+		impl->label = NULL;
+	}
+
+	GanvItem* item = GANV_ITEM(object);
+	ganv_node_disconnect(node);
+	if (item->impl->canvas) {
+		ganv_canvas_remove_node(item->impl->canvas, node);
+	}
+
+	if (GTK_OBJECT_CLASS(parent_class)->destroy) {
+		(*GTK_OBJECT_CLASS(parent_class)->destroy)(object);
+	}
+
+	impl->partner      = NULL;
+	item->impl->canvas = NULL;
+}
+
+static void
+ganv_node_update(GanvItem* item, int flags)
+{
+	GanvNode* node = GANV_NODE(item);
+	if (node->impl->must_resize) {
+		ganv_node_resize(node);
+		node->impl->must_resize = FALSE;
+	}
+
+	if (node->impl->label) {
+		ganv_item_invoke_update(GANV_ITEM(node->impl->label), flags);
+	}
+
+	GANV_ITEM_CLASS(parent_class)->update(item, flags);
+}
+
+static void
+ganv_node_draw(GanvItem* item,
+               cairo_t* cr, double cx, double cy, double cw, double ch)
+{
+	/* TODO: Label is not drawn here because ports need to draw control
+	   rects then the label on top.  I can't see a way of solving this since
+	   there's no single time parent class draw needs to be called, so perhaps
+	   label shouldn't be part of this class... */
+}
+
+static void
+ganv_node_set_property(GObject*      object,
+                       guint         prop_id,
+                       const GValue* value,
+                       GParamSpec*   pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_NODE(object));
+
+	GanvNode*        node = GANV_NODE(object);
+	GanvNodePrivate* impl = node->impl;
+
+	switch (prop_id) {
+		SET_CASE(DASH_LENGTH, double, impl->dash_length);
+		SET_CASE(DASH_OFFSET, double, impl->dash_offset);
+		SET_CASE(BORDER_WIDTH, double, impl->border_width);
+		SET_CASE(FILL_COLOR, uint, impl->fill_color);
+		SET_CASE(BORDER_COLOR, uint, impl->border_color);
+		SET_CASE(CAN_TAIL, boolean, impl->can_tail);
+		SET_CASE(CAN_HEAD, boolean, impl->can_head);
+		SET_CASE(IS_SOURCE, boolean, impl->is_source);
+		SET_CASE(HIGHLIGHTED, boolean, impl->highlighted);
+		SET_CASE(DRAGGABLE, boolean, impl->draggable);
+		SET_CASE(GRABBED, boolean, impl->grabbed);
+	case PROP_PARTNER:
+		impl->partner = (GanvNode*)g_value_get_object(value);
+		break;
+	case PROP_SELECTED:
+		if (impl->selected != g_value_get_boolean(value)) {
+			GanvItem* item = GANV_ITEM(object);
+			impl->selected = g_value_get_boolean(value);
+			if (item->impl->canvas) {
+				if (impl->selected) {
+					ganv_canvas_select_node(ganv_item_get_canvas(item), node);
+				} else {
+					ganv_canvas_unselect_node(ganv_item_get_canvas(item), node);
+				}
+				ganv_item_request_update(item);
+			}
+		}
+		break;
+	case PROP_CANVAS:
+		if (!GANV_ITEM(object)->impl->parent) {
+			GanvCanvas* canvas = GANV_CANVAS(g_value_get_object(value));
+			g_object_set(object, "parent", ganv_canvas_root(canvas), NULL);
+			ganv_canvas_add_node(canvas, node);
+		} else {
+			g_warning("Cannot change `canvas' property after construction");
+		}
+		break;
+	case PROP_LABEL:
+		ganv_node_set_label(node, g_value_get_string(value));
+		break;
+	case PROP_SHOW_LABEL:
+		ganv_node_set_show_label(node, g_value_get_boolean(value));
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_node_get_property(GObject*    object,
+                       guint       prop_id,
+                       GValue*     value,
+                       GParamSpec* pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_NODE(object));
+
+	GanvNode*        node = GANV_NODE(object);
+	GanvNodePrivate* impl = node->impl;
+
+	switch (prop_id) {
+		GET_CASE(PARTNER, object, impl->partner);
+		GET_CASE(LABEL, string, impl->label ? impl->label->impl->text : NULL);
+		GET_CASE(DASH_LENGTH, double, impl->dash_length);
+		GET_CASE(DASH_OFFSET, double, impl->dash_offset);
+		GET_CASE(BORDER_WIDTH, double, impl->border_width);
+		GET_CASE(FILL_COLOR, uint, impl->fill_color);
+		GET_CASE(BORDER_COLOR, uint, impl->border_color);
+		GET_CASE(CAN_TAIL, boolean, impl->can_tail);
+		GET_CASE(CAN_HEAD, boolean, impl->can_head);
+		GET_CASE(IS_SOURCE, boolean, impl->is_source);
+		GET_CASE(SELECTED, boolean, impl->selected);
+		GET_CASE(HIGHLIGHTED, boolean, impl->highlighted);
+		GET_CASE(DRAGGABLE, boolean, impl->draggable);
+		GET_CASE(GRABBED, boolean, impl->grabbed);
+	case PROP_CANVAS:
+		g_value_set_object(value, ganv_item_get_canvas(GANV_ITEM(object)));
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_node_default_tail_vector(const GanvNode* self,
+                              const GanvNode* head,
+                              double*         x,
+                              double*         y,
+                              double*         dx,
+                              double*         dy)
+{
+	GanvCanvas* canvas = ganv_item_get_canvas(GANV_ITEM(self));
+
+	*x = GANV_ITEM(self)->impl->x;
+	*y = GANV_ITEM(self)->impl->y;
+
+	switch (ganv_canvas_get_direction(canvas)) {
+	case GANV_DIRECTION_RIGHT:
+		*dx = 1.0;
+		*dy = 0.0;
+		break;
+	case GANV_DIRECTION_DOWN:
+		*dx = 0.0;
+		*dy = 1.0;
+		break;
+	}
+
+	ganv_item_i2w(GANV_ITEM(self)->impl->parent, x, y);
+}
+
+static void
+ganv_node_default_head_vector(const GanvNode* self,
+                              const GanvNode* tail,
+                              double*         x,
+                              double*         y,
+                              double*         dx,
+                              double*         dy)
+{
+	GanvCanvas* canvas = ganv_item_get_canvas(GANV_ITEM(self));
+
+	*x = GANV_ITEM(self)->impl->x;
+	*y = GANV_ITEM(self)->impl->y;
+
+	switch (ganv_canvas_get_direction(canvas)) {
+	case GANV_DIRECTION_RIGHT:
+		*dx = -1.0;
+		*dy = 0.0;
+		break;
+	case GANV_DIRECTION_DOWN:
+		*dx = 0.0;
+		*dy = -1.0;
+		break;
+	}
+
+	ganv_item_i2w(GANV_ITEM(self)->impl->parent, x, y);
+}
+
+void
+ganv_node_get_draw_properties(const GanvNode* node,
+                              double*         dash_length,
+                              double*         border_color,
+                              double*         fill_color)
+{
+	GanvNodePrivate* impl = node->impl;
+
+	*dash_length  = impl->dash_length;
+	*border_color = impl->border_color;
+	*fill_color   = impl->fill_color;
+
+	if (impl->selected) {
+		*dash_length  = 4.0;
+		*border_color = highlight_color(impl->border_color, 0x40);
+	}
+
+	if (impl->highlighted) {
+		*border_color = highlight_color(impl->border_color, 0x40);
+		*fill_color   = impl->fill_color;
+	}
+}
+
+void
+ganv_node_set_label(GanvNode* node, const char* str)
+{
+	GanvNodePrivate* impl = node->impl;
+	if (!str || str[0] == '\0') {
+		if (impl->label) {
+			gtk_object_destroy(GTK_OBJECT(impl->label));
+			impl->label = NULL;
+		}
+	} else if (impl->label) {
+		ganv_item_set(GANV_ITEM(impl->label),
+		              "text", str,
+		              NULL);
+	} else {
+		impl->label = GANV_TEXT(ganv_item_new(GANV_ITEM(node),
+		                                      ganv_text_get_type(),
+		                                      "text", str,
+		                                      "color", DEFAULT_TEXT_COLOR,
+		                                      "managed", TRUE,
+		                                      NULL));
+	}
+
+	impl->must_resize = TRUE;
+	ganv_item_request_update(GANV_ITEM(node));
+}
+
+void
+ganv_node_set_show_label(GanvNode* node, gboolean show)
+{
+	if (node->impl->label) {
+		if (show) {
+			ganv_item_show(GANV_ITEM(node->impl->label));
+		} else {
+			ganv_item_hide(GANV_ITEM(node->impl->label));
+		}
+	}
+	node->impl->show_label = show;
+	ganv_item_request_update(GANV_ITEM(node));
+}
+
+static void
+ganv_node_default_tick(GanvNode* self,
+                       double    seconds)
+{
+	GanvNode* node = GANV_NODE(self);
+	node->impl->dash_offset = seconds * 8.0;
+	ganv_item_request_update(GANV_ITEM(self));
+}
+
+static void
+ganv_node_default_disconnect(GanvNode* node)
+{
+	GanvCanvas* canvas = ganv_item_get_canvas(GANV_ITEM(node));
+	if (canvas) {
+		ganv_canvas_for_each_edge_on(
+			canvas, node, (GanvEdgeFunc)ganv_edge_disconnect, NULL);
+	}
+}
+
+static void
+ganv_node_default_move(GanvNode* node,
+                       double    dx,
+                       double    dy)
+{
+	GanvCanvas* canvas = ganv_item_get_canvas(GANV_ITEM(node));
+	ganv_item_move(GANV_ITEM(node), dx, dy);
+	ganv_canvas_for_each_edge_on(
+		canvas, node, (GanvEdgeFunc)ganv_edge_update_location, NULL);
+	ganv_item_request_update(GANV_ITEM(node));
+}
+
+static void
+ganv_node_default_move_to(GanvNode* node,
+                          double    x,
+                          double    y)
+{
+	GanvItem*   item   = GANV_ITEM(node);
+	GanvCanvas* canvas = ganv_item_get_canvas(item);
+	item->impl->x = x;
+	item->impl->y = y;
+	if (node->impl->can_tail) {
+		ganv_canvas_for_each_edge_from(
+			canvas, node, (GanvEdgeFunc)ganv_edge_update_location, NULL);
+	} else if (node->impl->can_head) {
+		ganv_canvas_for_each_edge_to(
+			canvas, node, (GanvEdgeFunc)ganv_edge_update_location, NULL);
+	}
+	ganv_item_request_update(GANV_ITEM(node));
+}
+
+static void
+ganv_node_default_resize(GanvNode* node)
+{
+	GanvItem* item = GANV_ITEM(node);
+	if (GANV_IS_NODE(item->impl->parent)) {
+		ganv_node_resize(GANV_NODE(item->impl->parent));
+	}
+	node->impl->must_resize = FALSE;
+}
+
+static void
+ganv_node_default_redraw_text(GanvNode* node)
+{
+	if (node->impl->label) {
+		ganv_text_layout(node->impl->label);
+		node->impl->must_resize = TRUE;
+		ganv_item_request_update(GANV_ITEM(node));
+	}
+}
+
+static gboolean
+ganv_node_default_event(GanvItem* item,
+                        GdkEvent* event)
+{
+	GanvNode*   node   = GANV_NODE(item);
+	GanvCanvas* canvas = ganv_item_get_canvas(GANV_ITEM(node));
+
+	// FIXME: put these somewhere better
+	static double last_x, last_y;
+	static double drag_start_x, drag_start_y;
+	static gboolean dragging = FALSE;
+
+	switch (event->type) {
+	case GDK_ENTER_NOTIFY:
+		ganv_item_raise(GANV_ITEM(node));
+		node->impl->highlighted = TRUE;
+		ganv_item_request_update(item);
+		return TRUE;
+
+	case GDK_LEAVE_NOTIFY:
+		ganv_item_lower(GANV_ITEM(node));
+		node->impl->highlighted = FALSE;
+		ganv_item_request_update(item);
+		return TRUE;
+
+	case GDK_BUTTON_PRESS:
+		drag_start_x = event->button.x;
+		drag_start_y = event->button.y;
+		last_x       = event->button.x;
+		last_y       = event->button.y;
+		if (!ganv_canvas_get_locked(canvas) && node->impl->draggable && event->button.button == 1) {
+			ganv_canvas_grab_item(
+				GANV_ITEM(node),
+				GDK_POINTER_MOTION_MASK|GDK_BUTTON_RELEASE_MASK|GDK_BUTTON_PRESS_MASK,
+				ganv_canvas_get_move_cursor(canvas),
+				event->button.time);
+			node->impl->grabbed = TRUE;
+			dragging = TRUE;
+			return TRUE;
+		}
+		break;
+
+	case GDK_BUTTON_RELEASE:
+		if (dragging) {
+			gboolean selected;
+			g_object_get(G_OBJECT(node), "selected", &selected, NULL);
+			ganv_canvas_ungrab_item(GANV_ITEM(node), event->button.time);
+			node->impl->grabbed = FALSE;
+			dragging = FALSE;
+			if (event->button.x != drag_start_x || event->button.y != drag_start_y) {
+				ganv_canvas_contents_changed(canvas);
+				if (selected) {
+					ganv_canvas_selection_move_finished(canvas);
+				} else {
+					const double x = GANV_ITEM(node)->impl->x;
+					const double y = GANV_ITEM(node)->impl->y;
+					g_signal_emit(node, signal_moved, 0, x, y, NULL);
+				}
+			} else {
+				// Clicked
+				if (selected) {
+					ganv_canvas_unselect_node(canvas, node);
+				} else {
+					if (!(event->button.state & (GDK_CONTROL_MASK | GDK_SHIFT_MASK))) {
+						ganv_canvas_clear_selection(canvas);
+					}
+					ganv_canvas_select_node(canvas, node);
+				}
+			}
+			return TRUE;
+		}
+		break;
+
+	case GDK_MOTION_NOTIFY:
+		if ((dragging && (event->motion.state & GDK_BUTTON1_MASK))) {
+			gboolean selected;
+			g_object_get(G_OBJECT(node), "selected", &selected, NULL);
+
+			double new_x = event->motion.x;
+			double new_y = event->motion.y;
+
+			if (event->motion.is_hint) {
+				int t_x;
+				int t_y;
+				GdkModifierType state;
+				gdk_window_get_pointer(event->motion.window, &t_x, &t_y, &state);
+				new_x = t_x;
+				new_y = t_y;
+			}
+
+			const double dx = new_x - last_x;
+			const double dy = new_y - last_y;
+			if (selected) {
+				ganv_canvas_move_selected_items(canvas, dx, dy);
+			} else {
+				ganv_node_move(node, dx, dy);
+			}
+
+			last_x = new_x;
+			last_y = new_y;
+			return TRUE;
+		}
+
+	default:
+		break;
+	}
+
+	return FALSE;
+}
+
+static void
+ganv_node_class_init(GanvNodeClass* klass)
+{
+	GObjectClass*   gobject_class = (GObjectClass*)klass;
+	GtkObjectClass* object_class  = (GtkObjectClass*)klass;
+	GanvItemClass*  item_class    = (GanvItemClass*)klass;
+
+	parent_class = GANV_ITEM_CLASS(g_type_class_peek_parent(klass));
+
+	gobject_class->set_property = ganv_node_set_property;
+	gobject_class->get_property = ganv_node_get_property;
+
+	g_object_class_install_property(
+		gobject_class, PROP_CANVAS, g_param_spec_object(
+			"canvas",
+			_("Canvas"),
+			_("The canvas this node is on."),
+			GANV_TYPE_CANVAS,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_PARTNER, g_param_spec_object(
+			"partner",
+			_("Partner"),
+			_("Partners are nodes that should be visually aligned to correspond"
+			  " to each other, even if they are not necessarily connected (e.g."
+			  " for separate modules representing the inputs and outputs of a"
+			  " single thing).  When the canvas is arranged, the partner will"
+			  " be aligned as if there was an edge from this node to its"
+			  " partner."),
+			GANV_TYPE_NODE,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_LABEL, g_param_spec_string(
+			"label",
+			_("Label"),
+			_("The text to display as a label on this node."),
+			NULL,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_SHOW_LABEL, g_param_spec_boolean(
+			"show-label",
+			_("Show label"),
+			_("Whether or not to show the label."),
+			0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_DASH_LENGTH, g_param_spec_double(
+			"dash-length",
+			_("Border dash length"),
+			_("Length of border dashes, or zero for no dashing."),
+			0.0, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_DASH_OFFSET, g_param_spec_double(
+			"dash-offset",
+			_("Border dash offset"),
+			_("Start offset for border dashes, used for selected animation."),
+			0.0, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_BORDER_WIDTH, g_param_spec_double(
+			"border-width",
+			_("Border width"),
+			_("Width of the border line."),
+			0.0, G_MAXDOUBLE,
+			2.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_FILL_COLOR, g_param_spec_uint(
+			"fill-color",
+			_("Fill color"),
+			_("Color of internal area."),
+			0, G_MAXUINT,
+			DEFAULT_FILL_COLOR,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_BORDER_COLOR, g_param_spec_uint(
+			"border-color",
+			_("Border color"),
+			_("Color of border line."),
+			0, G_MAXUINT,
+			DEFAULT_BORDER_COLOR,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_CAN_TAIL, g_param_spec_boolean(
+			"can-tail",
+			_("Can tail"),
+			_("Whether this node can be the tail of an edge."),
+			0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_CAN_HEAD, g_param_spec_boolean(
+			"can-head",
+			_("Can head"),
+			_("Whether this object can be the head of an edge."),
+			0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_IS_SOURCE, g_param_spec_boolean(
+			"is-source",
+			_("Is source"),
+			_("Whether this object should be positioned at the start of signal flow."),
+			0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_SELECTED, g_param_spec_boolean(
+			"selected",
+			_("Selected"),
+			_("Whether this object is selected."),
+			0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_HIGHLIGHTED, g_param_spec_boolean(
+			"highlighted",
+			_("Highlighted"),
+			_("Whether this object is highlighted."),
+			0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_DRAGGABLE, g_param_spec_boolean(
+			"draggable",
+			_("Draggable"),
+			_("Whether this object is draggable."),
+			0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_GRABBED, g_param_spec_boolean(
+			"grabbed",
+			_("Grabbed"),
+			_("Whether this object is grabbed by the user."),
+			0,
+			G_PARAM_READWRITE));
+
+	signal_moved = g_signal_new("moved",
+	                            ganv_node_get_type(),
+	                            G_SIGNAL_RUN_FIRST,
+	                            0, NULL, NULL,
+	                            ganv_marshal_VOID__DOUBLE_DOUBLE,
+	                            G_TYPE_NONE,
+	                            2,
+	                            G_TYPE_DOUBLE,
+	                            G_TYPE_DOUBLE,
+	                            0);
+
+	object_class->destroy = ganv_node_destroy;
+
+	item_class->realize = ganv_node_realize;
+	item_class->event   = ganv_node_default_event;
+	item_class->update  = ganv_node_update;
+	item_class->draw    = ganv_node_draw;
+
+	klass->disconnect  = ganv_node_default_disconnect;
+	klass->move        = ganv_node_default_move;
+	klass->move_to     = ganv_node_default_move_to;
+	klass->resize      = ganv_node_default_resize;
+	klass->redraw_text = ganv_node_default_redraw_text;
+	klass->tick        = ganv_node_default_tick;
+	klass->tail_vector = ganv_node_default_tail_vector;
+	klass->head_vector = ganv_node_default_head_vector;
+}
+
+gboolean
+ganv_node_can_tail(const GanvNode* self)
+{
+	return self->impl->can_tail;
+}
+
+gboolean
+ganv_node_can_head(const GanvNode* self)
+{
+	return self->impl->can_head;
+}
+
+void
+ganv_node_set_is_source(const GanvNode* node, gboolean is_source)
+{
+	node->impl->is_source = is_source;
+}
+
+gboolean
+ganv_node_is_within(const GanvNode* node,
+                    double          x1,
+                    double          y1,
+                    double          x2,
+                    double          y2)
+{
+	return GANV_NODE_GET_CLASS(node)->is_within(node, x1, y1, x2, y2);
+}
+
+void
+ganv_node_tick(GanvNode* node,
+               double    seconds)
+{
+	GanvNodeClass* klass = GANV_NODE_GET_CLASS(node);
+	if (klass->tick) {
+		klass->tick(node, seconds);
+	}
+}
+
+void
+ganv_node_tail_vector(const GanvNode* self,
+                      const GanvNode* head,
+                      double*         x1,
+                      double*         y1,
+                      double*         x2,
+                      double*         y2)
+{
+	GANV_NODE_GET_CLASS(self)->tail_vector(
+		self, head, x1, y1, x2, y2);
+}
+
+void
+ganv_node_head_vector(const GanvNode* self,
+                      const GanvNode* tail,
+                      double*         x1,
+                      double*         y1,
+                      double*         x2,
+                      double*         y2)
+{
+	GANV_NODE_GET_CLASS(self)->head_vector(
+		self, tail, x1, y1, x2, y2);
+}
+
+const char*
+ganv_node_get_label(const GanvNode* node)
+{
+	return node->impl->label ? node->impl->label->impl->text : NULL;
+}
+
+double
+ganv_node_get_border_width(const GanvNode* node)
+{
+	return node->impl->border_width;
+}
+
+void
+ganv_node_set_border_width(const GanvNode* node, double border_width)
+{
+	node->impl->border_width = border_width;
+	ganv_item_request_update(GANV_ITEM(node));
+}
+
+double
+ganv_node_get_dash_length(const GanvNode* node)
+{
+	return node->impl->dash_length;
+}
+
+void
+ganv_node_set_dash_length(const GanvNode* node, double dash_length)
+{
+	node->impl->dash_length = dash_length;
+	ganv_item_request_update(GANV_ITEM(node));
+}
+
+double
+ganv_node_get_dash_offset(const GanvNode* node)
+{
+	return node->impl->dash_offset;
+}
+
+void
+ganv_node_set_dash_offset(const GanvNode* node, double dash_offset)
+{
+	node->impl->dash_offset = dash_offset;
+	ganv_item_request_update(GANV_ITEM(node));
+}
+
+guint
+ganv_node_get_fill_color(const GanvNode* node)
+{
+	return node->impl->fill_color;
+}
+
+void
+ganv_node_set_fill_color(const GanvNode* node, guint fill_color)
+{
+	node->impl->fill_color = fill_color;
+	ganv_item_request_update(GANV_ITEM(node));
+}
+
+guint
+ganv_node_get_border_color(const GanvNode* node)
+{
+	return node->impl->border_color;
+}
+
+void
+ganv_node_set_border_color(const GanvNode* node, guint border_color)
+{
+	node->impl->border_color = border_color;
+	ganv_item_request_update(GANV_ITEM(node));
+}
+
+GanvNode*
+ganv_node_get_partner(const GanvNode* node)
+{
+	return node->impl->partner;
+}
+
+void
+ganv_node_move(GanvNode* node,
+               double    dx,
+               double    dy)
+{
+	GANV_NODE_GET_CLASS(node)->move(node, dx, dy);
+}
+
+void
+ganv_node_move_to(GanvNode* node,
+                  double    x,
+                  double    y)
+{
+	GANV_NODE_GET_CLASS(node)->move_to(node, x, y);
+}
+
+void
+ganv_node_resize(GanvNode* node)
+{
+	GANV_NODE_GET_CLASS(node)->resize(node);
+	node->impl->must_resize = FALSE;
+}
+
+void
+ganv_node_redraw_text(GanvNode* node)
+{
+	GANV_NODE_GET_CLASS(node)->redraw_text(node);
+}
+
+void
+ganv_node_disconnect(GanvNode* node)
+{
+	GANV_NODE_GET_CLASS(node)->disconnect(node);
+}
+
+gboolean
+ganv_node_is_selected(GanvNode* node)
+{
+	gboolean selected = FALSE;
+	g_object_get(node, "selected", &selected, NULL);
+	return selected;
+}
diff --git a/src/port.c b/src/port.c
new file mode 100644
index 0000000..fa76f22
--- /dev/null
+++ b/src/port.c
@@ -0,0 +1,735 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <math.h>
+#include <stdlib.h>
+
+#include "ganv/canvas.h"
+#include "ganv/port.h"
+#include "ganv/module.h"
+
+#include "./boilerplate.h"
+#include "./color.h"
+#include "./ganv-private.h"
+#include "./gettext.h"
+
+static const double PORT_LABEL_HPAD = 4.0;
+static const double PORT_LABEL_VPAD = 1.0;
+
+static void
+ganv_port_update_control_slider(GanvPort* port, float value, gboolean force);
+
+G_DEFINE_TYPE_WITH_CODE(GanvPort, ganv_port, GANV_TYPE_BOX,
+                        G_ADD_PRIVATE(GanvPort))
+
+static GanvBoxClass* parent_class;
+
+enum {
+	PROP_0,
+	PROP_IS_INPUT,
+	PROP_IS_CONTROLLABLE
+};
+
+enum {
+	PORT_VALUE_CHANGED,
+	PORT_LAST_SIGNAL
+};
+
+static guint port_signals[PORT_LAST_SIGNAL];
+
+static void
+ganv_port_init(GanvPort* port)
+{
+	port->impl = ganv_port_get_instance_private(port);
+
+	port->impl->control         = NULL;
+	port->impl->value_label     = NULL;
+	port->impl->is_input        = TRUE;
+	port->impl->is_controllable = FALSE;
+}
+
+static void
+ganv_port_destroy(GtkObject* object)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_PORT(object));
+
+	GanvItem*   item   = GANV_ITEM(object);
+	GanvPort*   port   = GANV_PORT(object);
+	GanvCanvas* canvas = ganv_item_get_canvas(item);
+	if (canvas) {
+		if (port->impl->is_input) {
+			ganv_canvas_for_each_edge_to(
+				canvas, &port->box.node, (GanvEdgeFunc)ganv_edge_remove, NULL);
+		} else {
+			ganv_canvas_for_each_edge_from(
+				canvas, &port->box.node, (GanvEdgeFunc)ganv_edge_remove, NULL);
+		}
+	}
+
+	if (GTK_OBJECT_CLASS(parent_class)->destroy) {
+		(*GTK_OBJECT_CLASS(parent_class)->destroy)(object);
+	}
+}
+
+static void
+ganv_port_set_property(GObject*      object,
+                       guint         prop_id,
+                       const GValue* value,
+                       GParamSpec*   pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_PORT(object));
+
+	GanvPort* port = GANV_PORT(object);
+
+	switch (prop_id) {
+		SET_CASE(IS_INPUT, boolean, port->impl->is_input);
+		SET_CASE(IS_CONTROLLABLE, boolean, port->impl->is_controllable);
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_port_get_property(GObject*    object,
+                       guint       prop_id,
+                       GValue*     value,
+                       GParamSpec* pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_PORT(object));
+
+	GanvPort* port = GANV_PORT(object);
+
+	switch (prop_id) {
+		GET_CASE(IS_INPUT, boolean, port->impl->is_input);
+		GET_CASE(IS_CONTROLLABLE, boolean, port->impl->is_controllable);
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_port_update(GanvItem* item, int flags)
+{
+	GanvPort*        port = GANV_PORT(item);
+	GanvPortPrivate* impl = port->impl;
+
+	if (impl->control) {
+		ganv_item_invoke_update(GANV_ITEM(impl->control->rect), flags);
+	}
+
+	if (impl->value_label) {
+		ganv_item_invoke_update(GANV_ITEM(port->impl->value_label), flags);
+	}
+
+	GanvItemClass* item_class = GANV_ITEM_CLASS(parent_class);
+	item_class->update(item, flags);
+}
+
+static void
+ganv_port_draw(GanvItem* item,
+               cairo_t* cr, double cx, double cy, double cw, double ch)
+{
+	GanvPort*   port   = GANV_PORT(item);
+	GanvCanvas* canvas = ganv_item_get_canvas(item);
+
+	// Draw Box
+	GanvItemClass* item_class = GANV_ITEM_CLASS(parent_class);
+	item_class->draw(item, cr, cx, cy, cw, ch);
+
+	if (port->impl->control) {
+		// Clip to port boundaries (to stay within radiused borders)
+		cairo_save(cr);
+		const double  pad    = GANV_NODE(port)->impl->border_width / 2.0;
+		GanvBoxCoords coords = GANV_BOX(port)->impl->coords;
+		ganv_item_i2w_pair(GANV_ITEM(port),
+		                   &coords.x1, &coords.y1, &coords.x2, &coords.y2);
+		ganv_box_path(GANV_BOX(port), cr,
+		              coords.x1 + pad, coords.y1 + pad,
+		              coords.x2 - pad, coords.y2 - pad,
+		              -pad);
+		cairo_clip(cr);
+
+		GanvItem* const rect = GANV_ITEM(port->impl->control->rect);
+		GANV_ITEM_GET_CLASS(rect)->draw(rect, cr, cx, cy, cw, ch);
+
+		cairo_restore(cr);
+	}
+
+	if (ganv_canvas_get_direction(canvas) == GANV_DIRECTION_DOWN ||
+	    !GANV_NODE(port)->impl->show_label) {
+		return;
+	}
+
+	GanvItem* labels[2] = {
+		GANV_ITEM(GANV_NODE(item)->impl->label),
+		port->impl->value_label ? GANV_ITEM(port->impl->value_label) : NULL
+	};
+	for (int i = 0; i < 2; ++i) {
+		if (labels[i] && (labels[i]->object.flags & GANV_ITEM_VISIBLE)) {
+			GANV_ITEM_GET_CLASS(labels[i])->draw(
+				labels[i], cr, cx, cy, cw, ch);
+		}
+	}
+}
+
+static void
+ganv_port_tail_vector(const GanvNode* self,
+                      const GanvNode* head,
+                      double*         x,
+                      double*         y,
+                      double*         dx,
+                      double*         dy)
+{
+	GanvPort*   port   = GANV_PORT(self);
+	GanvItem*   item   = &port->box.node.item;
+	GanvCanvas* canvas = ganv_item_get_canvas(item);
+
+	const double px           = item->impl->x;
+	const double py           = item->impl->y;
+	const double border_width = GANV_NODE(port)->impl->border_width;
+
+	switch (ganv_canvas_get_direction(canvas)) {
+	case GANV_DIRECTION_RIGHT:
+		*x  = px + ganv_box_get_width(&port->box) + (border_width / 2.0);
+		*y  = py + ganv_box_get_height(&port->box) / 2.0;
+		*dx = 1.0;
+		*dy = 0.0;
+		break;
+	case GANV_DIRECTION_DOWN:
+		*x  = px + ganv_box_get_width(&port->box) / 2.0;
+		*y  = py + ganv_box_get_height(&port->box) + (border_width / 2.0);
+		*dx = 0.0;
+		*dy = 1.0;
+		break;
+	}
+
+	ganv_item_i2w(item->impl->parent, x, y);
+}
+
+static void
+ganv_port_head_vector(const GanvNode* self,
+                      const GanvNode* tail,
+                      double*         x,
+                      double*         y,
+                      double*         dx,
+                      double*         dy)
+{
+	GanvPort*   port   = GANV_PORT(self);
+	GanvItem*   item   = &port->box.node.item;
+	GanvCanvas* canvas = ganv_item_get_canvas(item);
+
+	const double px           = item->impl->x;
+	const double py           = item->impl->y;
+	const double border_width = GANV_NODE(port)->impl->border_width;
+
+	switch (ganv_canvas_get_direction(canvas)) {
+	case GANV_DIRECTION_RIGHT:
+		*x  = px - (border_width / 2.0);
+		*y  = py + ganv_box_get_height(&port->box) / 2.0;
+		*dx = -1.0;
+		*dy = 0.0;
+		break;
+	case GANV_DIRECTION_DOWN:
+		*x  = px + ganv_box_get_width(&port->box) / 2.0;
+		*y  = py - (border_width / 2.0);
+		*dx = 0.0;
+		*dy = -1.0;
+		break;
+	}
+
+	ganv_item_i2w(item->impl->parent, x, y);
+}
+
+static void
+ganv_port_place_labels(GanvPort* port)
+{
+	GanvCanvas*      canvas   = ganv_item_get_canvas(GANV_ITEM(port));
+	GanvPortPrivate* impl     = port->impl;
+	GanvText*        label    = GANV_NODE(port)->impl->label;
+	const double     port_w   = ganv_box_get_width(&port->box);
+	const double     port_h   = ganv_box_get_height(&port->box);
+	double           vlabel_w = 0.0;
+	if (impl->value_label) {
+		const double vlabel_h = impl->value_label->impl->coords.height;
+		vlabel_w = impl->value_label->impl->coords.width;
+		if (ganv_canvas_get_direction(canvas) == GANV_DIRECTION_RIGHT) {
+			ganv_item_set(GANV_ITEM(impl->value_label),
+			              "x", PORT_LABEL_HPAD,
+			              "y", (port_h - vlabel_h) / 2.0 - PORT_LABEL_VPAD,
+			              NULL);
+		} else {
+			ganv_item_set(GANV_ITEM(impl->value_label),
+			              "x", (port_w - vlabel_w) / 2.0,
+			              "y", (port_h - vlabel_h) / 2.0 - PORT_LABEL_VPAD,
+			              NULL);
+		}
+		vlabel_w += PORT_LABEL_HPAD;
+	}
+	if (label) {
+		const double label_h = label->impl->coords.height;
+		if (ganv_canvas_get_direction(canvas) == GANV_DIRECTION_RIGHT) {
+			ganv_item_set(GANV_ITEM(label),
+			              "x", vlabel_w + PORT_LABEL_HPAD,
+			              "y", (port_h - label_h) / 2.0 - PORT_LABEL_VPAD,
+			              NULL);
+		}
+	}
+}
+
+static void
+ganv_port_resize(GanvNode* self)
+{
+	GanvPort* port   = GANV_PORT(self);
+	GanvNode* node   = GANV_NODE(self);
+	GanvText* label  = node->impl->label;
+	GanvText* vlabel = port->impl->value_label;
+
+	double label_w  = 0.0;
+	double label_h  = 0.0;
+	double vlabel_w = 0.0;
+	double vlabel_h = 0.0;
+	if (label && (GANV_ITEM(label)->object.flags & GANV_ITEM_VISIBLE)) {
+		g_object_get(label, "width", &label_w, "height", &label_h, NULL);
+	}
+	if (vlabel && (GANV_ITEM(vlabel)->object.flags & GANV_ITEM_VISIBLE)) {
+		g_object_get(vlabel, "width", &vlabel_w, "height", &vlabel_h, NULL);
+	}
+
+	if (label || vlabel) {
+		double labels_w = label_w + PORT_LABEL_HPAD * 2.0;
+		if (vlabel_w != 0.0) {
+			labels_w += vlabel_w + PORT_LABEL_HPAD;
+		}
+		ganv_box_set_width(&port->box, labels_w);
+		ganv_box_set_height(&port->box,
+		                    MAX(label_h, vlabel_h) + (PORT_LABEL_VPAD * 2.0));
+
+		ganv_port_place_labels(port);
+	}
+
+	if (GANV_NODE_CLASS(parent_class)->resize) {
+		GANV_NODE_CLASS(parent_class)->resize(self);
+	}
+}
+
+static void
+ganv_port_redraw_text(GanvNode* node)
+{
+	GanvPort* port = GANV_PORT(node);
+	if (port->impl->value_label) {
+		ganv_text_layout(port->impl->value_label);
+	}
+	if (GANV_NODE_CLASS(parent_class)->redraw_text) {
+		(*GANV_NODE_CLASS(parent_class)->redraw_text)(node);
+	}
+	ganv_port_place_labels(port);
+}
+
+static void
+ganv_port_set_width(GanvBox* box,
+                    double   width)
+{
+	GanvPort* port = GANV_PORT(box);
+	parent_class->set_width(box, width);
+	if (port->impl->control) {
+		ganv_port_update_control_slider(port, port->impl->control->value, TRUE);
+	}
+	ganv_port_place_labels(port);
+}
+
+static void
+ganv_port_set_height(GanvBox* box,
+                     double   height)
+{
+	GanvPort* port = GANV_PORT(box);
+	parent_class->set_height(box, height);
+	if (port->impl->control) {
+		ganv_item_set(GANV_ITEM(port->impl->control->rect),
+		              "y1", box->impl->coords.border_width / 2.0,
+		              "y2", height - box->impl->coords.border_width / 2.0,
+		              NULL);
+	}
+	ganv_port_place_labels(port);
+}
+
+static gboolean
+ganv_port_event(GanvItem* item, GdkEvent* event)
+{
+	GanvCanvas* canvas = ganv_item_get_canvas(item);
+
+	return ganv_canvas_port_event(canvas, GANV_PORT(item), event);
+}
+
+static void
+ganv_port_class_init(GanvPortClass* klass)
+{
+	GObjectClass*   gobject_class = (GObjectClass*)klass;
+	GtkObjectClass* object_class  = (GtkObjectClass*)klass;
+	GanvItemClass*  item_class    = (GanvItemClass*)klass;
+	GanvNodeClass*  node_class    = (GanvNodeClass*)klass;
+	GanvBoxClass*   box_class     = (GanvBoxClass*)klass;
+
+	parent_class = GANV_BOX_CLASS(g_type_class_peek_parent(klass));
+
+	gobject_class->set_property = ganv_port_set_property;
+	gobject_class->get_property = ganv_port_get_property;
+
+	g_object_class_install_property(
+		gobject_class, PROP_IS_INPUT, g_param_spec_boolean(
+			"is-input",
+			_("Is input"),
+			_("Whether this port is an input, rather than an output."),
+			0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_IS_CONTROLLABLE, g_param_spec_boolean(
+			"is-controllable",
+			_("Is controllable"),
+			_("Whether this port can be controlled by the user."),
+			0,
+			G_PARAM_READWRITE));
+
+	port_signals[PORT_VALUE_CHANGED]
+	    = g_signal_new("value-changed",
+	                   G_TYPE_FROM_CLASS(klass),
+	                   G_SIGNAL_RUN_LAST,
+	                   0,
+	                   NULL, NULL,
+	                   NULL,
+	                   G_TYPE_NONE, 1,
+	                   G_TYPE_DOUBLE);
+
+	object_class->destroy = ganv_port_destroy;
+
+	item_class->update = ganv_port_update;
+	item_class->event  = ganv_port_event;
+	item_class->draw   = ganv_port_draw;
+
+	node_class->tail_vector = ganv_port_tail_vector;
+	node_class->head_vector = ganv_port_head_vector;
+	node_class->resize      = ganv_port_resize;
+	node_class->redraw_text = ganv_port_redraw_text;
+
+	box_class->set_width  = ganv_port_set_width;
+	box_class->set_height = ganv_port_set_height;
+}
+
+GanvPort*
+ganv_port_new(GanvModule* module,
+              gboolean    is_input,
+              const char* first_prop_name, ...)
+{
+	GanvPort* port = GANV_PORT(g_object_new(ganv_port_get_type(), NULL));
+
+	port->impl->is_input = is_input;
+
+	GanvItem* item = GANV_ITEM(port);
+	va_list args;
+	va_start(args, first_prop_name);
+	ganv_item_construct(item,
+	                    GANV_ITEM(module),
+	                    first_prop_name, args);
+	va_end(args);
+
+	GanvBox* box = GANV_BOX(port);
+	box->impl->coords.border_width = 1.0;
+
+	GanvNode* node = GANV_NODE(port);
+	node->impl->can_tail     = !is_input;
+	node->impl->can_head     = is_input;
+	node->impl->draggable    = FALSE;
+	node->impl->border_width = 2.0;
+
+	GanvCanvas* canvas = ganv_item_get_canvas(GANV_ITEM(port));
+	ganv_port_set_direction(port, ganv_canvas_get_direction(canvas));
+
+	return port;
+}
+
+void
+ganv_port_set_direction(GanvPort*     port,
+                        GanvDirection direction)
+{
+	GanvNode* node     = GANV_NODE(port);
+	GanvBox*  box      = GANV_BOX(port);
+	gboolean  is_input = port->impl->is_input;
+	switch (direction) {
+	case GANV_DIRECTION_RIGHT:
+		box->impl->radius_tl = (is_input ? 0.0 : 5.0);
+		box->impl->radius_tr = (is_input ? 5.0 : 0.0);
+		box->impl->radius_br = (is_input ? 5.0 : 0.0);
+		box->impl->radius_bl = (is_input ? 0.0 : 5.0);
+		break;
+	case GANV_DIRECTION_DOWN:
+		box->impl->radius_tl = (is_input ? 0.0 : 5.0);
+		box->impl->radius_tr = (is_input ? 0.0 : 5.0);
+		box->impl->radius_br = (is_input ? 5.0 : 0.0);
+		box->impl->radius_bl = (is_input ? 5.0 : 0.0);
+		break;
+	}
+
+	node->impl->must_resize = TRUE;
+	ganv_item_request_update(GANV_ITEM(node));
+}
+
+void
+ganv_port_show_control(GanvPort* port)
+{
+	if (port->impl->control) {
+		return;
+	}
+
+	const guint  color        = 0xFFFFFF66;
+	const double border_width = GANV_NODE(port)->impl->border_width;
+
+	GanvPortControl* control = (GanvPortControl*)malloc(sizeof(GanvPortControl));
+	port->impl->control = control;
+
+	control->value      = 0.0f;
+	control->min        = 0.0f;
+	control->max        = 1.0f;
+	control->is_toggle  = FALSE;
+	control->is_integer = FALSE;
+	control->rect       = GANV_BOX(
+		ganv_item_new(GANV_ITEM(port),
+		              ganv_box_get_type(),
+		              "x1", border_width / 2.0,
+		              "y1", border_width / 2.0,
+		              "x2", 0.0,
+		              "y2", ganv_box_get_height(&port->box) - border_width / 2.0,
+		              "fill-color", color,
+		              "border-color", color,
+		              "border-width", 0.0,
+		              "managed", TRUE,
+		              NULL));
+	ganv_item_show(GANV_ITEM(control->rect));
+}
+
+void
+ganv_port_hide_control(GanvPort* port)
+{
+	gtk_object_destroy(GTK_OBJECT(port->impl->control->rect));
+	free(port->impl->control);
+	port->impl->control = NULL;
+}
+
+void
+ganv_port_set_value_label(GanvPort*   port,
+                          const char* str)
+{
+	GanvPortPrivate* impl = port->impl;
+
+	if (!str || str[0] == '\0') {
+		if (impl->value_label) {
+			gtk_object_destroy(GTK_OBJECT(impl->value_label));
+			impl->value_label = NULL;
+		}
+	} else if (impl->value_label) {
+		ganv_item_set(GANV_ITEM(impl->value_label),
+		              "text", str,
+		              NULL);
+	} else {
+		impl->value_label = GANV_TEXT(ganv_item_new(GANV_ITEM(port),
+		                                            ganv_text_get_type(),
+		                                            "text", str,
+		                                            "color", DIM_TEXT_COLOR,
+		                                            "managed", TRUE,
+		                                            NULL));
+	}
+}
+
+static void
+ganv_port_update_control_slider(GanvPort* port, float value, gboolean force)
+{
+	GanvPortPrivate* impl = port->impl;
+	if (!impl->control) {
+		return;
+	}
+
+	// Clamp to toggle or integer value if applicable
+	if (impl->control->is_toggle) {
+		if (value != 0.0f) {
+			value = impl->control->max;
+		} else {
+			value = impl->control->min;
+		}
+	} else if (impl->control->is_integer) {
+		value = lrintf(value);
+	}
+
+	// Clamp to range
+	if (value < impl->control->min) {
+		value = impl->control->min;
+	}
+	if (value > impl->control->max) {
+		value = impl->control->max;
+	}
+
+	if (!force && value == impl->control->value) {
+		return;  // No change, do nothing
+	}
+
+	const double span = (ganv_box_get_width(&port->box) -
+	                     GANV_NODE(port)->impl->border_width);
+
+	const double w = (value - impl->control->min)
+		/ (impl->control->max - impl->control->min)
+		* span;
+
+	if (isnan(w)) {
+		return;  // Shouldn't happen, but ignore crazy values
+	}
+
+	// Redraw port
+	impl->control->value = value;
+	ganv_box_set_width(impl->control->rect, MAX(0.0, w));
+	ganv_box_request_redraw(
+		GANV_ITEM(port), &GANV_BOX(port)->impl->coords, FALSE);
+}
+
+void
+ganv_port_set_control_is_toggle(GanvPort* port,
+                                gboolean  is_toggle)
+{
+	if (port->impl->control) {
+		port->impl->control->is_toggle = is_toggle;
+		ganv_port_update_control_slider(port, port->impl->control->value, TRUE);
+	}
+}
+
+void
+ganv_port_set_control_is_integer(GanvPort* port,
+                                 gboolean  is_integer)
+{
+	if (port->impl->control) {
+		port->impl->control->is_integer = is_integer;
+		const float rounded = rintf(port->impl->control->value);
+		ganv_port_update_control_slider(port, rounded, TRUE);
+	}
+}
+
+void
+ganv_port_set_control_value(GanvPort* port,
+                            float     value)
+{
+	ganv_port_update_control_slider(port, value, FALSE);
+}
+
+void
+ganv_port_set_control_value_internal(GanvPort* port,
+                                     float     value)
+{
+	// Update slider
+	ganv_port_set_control_value(port, value);
+
+	// Fire signal to notify user value has changed
+	const double dvalue = port->impl->control->value;
+	g_signal_emit(port, port_signals[PORT_VALUE_CHANGED], 0, dvalue, NULL);
+}
+
+void
+ganv_port_set_control_min(GanvPort* port,
+                          float     min)
+{
+	if (port->impl->control) {
+		const gboolean force = port->impl->control->min != min;
+		port->impl->control->min = min;
+		if (port->impl->control->max < min) {
+			port->impl->control->max = min;
+		}
+		ganv_port_update_control_slider(port, port->impl->control->value, force);
+	}
+}
+
+void
+ganv_port_set_control_max(GanvPort* port,
+                          float     max)
+{
+	if (port->impl->control) {
+		const gboolean force = port->impl->control->max != max;
+		port->impl->control->max = max;
+		if (port->impl->control->min > max) {
+			port->impl->control->min = max;
+		}
+		ganv_port_update_control_slider(port, port->impl->control->value, force);
+	}
+}
+
+double
+ganv_port_get_natural_width(const GanvPort* port)
+{
+	GanvCanvas* const canvas = ganv_item_get_canvas(GANV_ITEM(port));
+	GanvText* const   label  = port->box.node.impl->label;
+	double            w      = 0.0;
+	if (ganv_canvas_get_direction(canvas) == GANV_DIRECTION_DOWN) {
+		w = ganv_module_get_empty_port_breadth(ganv_port_get_module(port));
+	} else if (label && (GANV_ITEM(label)->object.flags & GANV_ITEM_VISIBLE)) {
+		double label_w;
+		g_object_get(port->box.node.impl->label, "width", &label_w, NULL);
+		w = label_w + (PORT_LABEL_HPAD * 2.0);
+	} else {
+		w = ganv_module_get_empty_port_depth(ganv_port_get_module(port));
+	}
+	if (port->impl->value_label &&
+	    (GANV_ITEM(port->impl->value_label)->object.flags
+	     & GANV_ITEM_VISIBLE)) {
+		double label_w;
+		g_object_get(port->impl->value_label, "width", &label_w, NULL);
+		w += label_w + PORT_LABEL_HPAD;
+	}
+	return w;
+}
+
+GanvModule*
+ganv_port_get_module(const GanvPort* port)
+{
+	return GANV_MODULE(GANV_ITEM(port)->impl->parent);
+}
+
+float
+ganv_port_get_control_value(const GanvPort* port)
+{
+	return port->impl->control ? port->impl->control->value : 0.0f;
+}
+
+float
+ganv_port_get_control_min(const GanvPort* port)
+{
+	return port->impl->control ? port->impl->control->min : 0.0f;
+}
+
+float
+ganv_port_get_control_max(const GanvPort* port)
+{
+	return port->impl->control ? port->impl->control->max : 0.0f;
+}
+
+gboolean
+ganv_port_is_input(const GanvPort* port)
+{
+	return port->impl->is_input;
+}
+
+gboolean
+ganv_port_is_output(const GanvPort* port)
+{
+	return !port->impl->is_input;
+}
diff --git a/src/text.c b/src/text.c
new file mode 100644
index 0000000..bbac187
--- /dev/null
+++ b/src/text.c
@@ -0,0 +1,381 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2015 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <math.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <gtk/gtkstyle.h>
+
+#include "ganv/canvas.h"
+#include "ganv/text.h"
+
+#include "./color.h"
+#include "./boilerplate.h"
+#include "./gettext.h"
+#include "./ganv-private.h"
+
+G_DEFINE_TYPE_WITH_CODE(GanvText, ganv_text, GANV_TYPE_ITEM,
+                        G_ADD_PRIVATE(GanvText))
+
+static GanvItemClass* parent_class;
+
+enum {
+	PROP_0,
+	PROP_TEXT,
+	PROP_X,
+	PROP_Y,
+	PROP_WIDTH,
+	PROP_HEIGHT,
+	PROP_COLOR,
+	PROP_FONT_SIZE
+};
+
+static void
+ganv_text_init(GanvText* text)
+{
+	GanvTextPrivate* impl = ganv_text_get_instance_private(text);
+
+	text->impl = impl;
+
+	memset(&impl->coords, '\0', sizeof(GanvTextCoords));
+	impl->coords.width  = 1.0;
+	impl->coords.height = 1.0;
+	impl->old_coords    = impl->coords;
+
+	impl->layout       = NULL;
+	impl->text         = NULL;
+	impl->font_size    = 0.0;
+	impl->color        = DEFAULT_TEXT_COLOR;
+	impl->needs_layout = FALSE;
+}
+
+static void
+ganv_text_destroy(GtkObject* object)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_TEXT(object));
+
+	GanvText*        text = GANV_TEXT(object);
+	GanvTextPrivate* impl = text->impl;
+
+	if (impl->text) {
+		g_free(impl->text);
+		impl->text = NULL;
+	}
+
+	if (impl->layout) {
+		g_object_unref(impl->layout);
+		impl->layout = NULL;
+	}
+
+	if (GTK_OBJECT_CLASS(parent_class)->destroy) {
+		(*GTK_OBJECT_CLASS(parent_class)->destroy)(object);
+	}
+}
+
+void
+ganv_text_layout(GanvText* text)
+{
+	GanvTextPrivate* impl   = text->impl;
+	GanvItem*        item   = GANV_ITEM(text);
+	GanvCanvas*      canvas = ganv_item_get_canvas(item);
+	GtkWidget*       widget = GTK_WIDGET(canvas);
+	double           points = impl->font_size;
+	GtkStyle*        style  = gtk_rc_get_style(widget);
+
+	if (impl->font_size == 0.0) {
+		points = ganv_canvas_get_font_size(canvas);
+	}
+
+	if (impl->layout) {
+		g_object_unref(impl->layout);
+	}
+	impl->layout = gtk_widget_create_pango_layout(widget, impl->text);
+
+	PangoFontDescription* font = pango_font_description_copy(style->font_desc);
+	PangoContext*         ctx  = pango_layout_get_context(impl->layout);
+	cairo_font_options_t* opt  = cairo_font_options_copy(
+		pango_cairo_context_get_font_options(ctx));
+
+	pango_font_description_set_size(font, points * (double)PANGO_SCALE);
+	pango_layout_set_font_description(impl->layout, font);
+	pango_cairo_context_set_font_options(ctx, opt);
+	cairo_font_options_destroy(opt);
+	pango_font_description_free(font);
+
+	int width, height;
+	pango_layout_get_pixel_size(impl->layout, &width, &height);
+
+	impl->coords.width  = width;
+	impl->coords.height = height;
+	impl->needs_layout  = FALSE;
+
+	ganv_item_request_update(GANV_ITEM(text));
+}
+
+static void
+ganv_text_set_property(GObject*      object,
+                       guint         prop_id,
+                       const GValue* value,
+                       GParamSpec*   pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_TEXT(object));
+
+	GanvText*        text = GANV_TEXT(object);
+	GanvTextPrivate* impl = text->impl;
+
+	switch (prop_id) {
+	case PROP_X:
+		impl->coords.x = g_value_get_double(value);
+		break;
+	case PROP_Y:
+		impl->coords.y = g_value_get_double(value);
+		break;
+	case PROP_COLOR:
+		impl->color = g_value_get_uint(value);
+		break;
+	case PROP_FONT_SIZE:
+		impl->font_size    = g_value_get_double(value);
+		impl->needs_layout = TRUE;
+		break;
+	case PROP_TEXT:
+		free(impl->text);
+		impl->text         = g_value_dup_string(value);
+		impl->needs_layout = TRUE;
+		break;
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		return;
+	}
+	if (impl->needs_layout) {
+		if (GANV_IS_NODE(GANV_ITEM(text)->impl->parent)) {
+			GANV_NODE(GANV_ITEM(text)->impl->parent)->impl->must_resize = TRUE;
+		}
+	}
+	ganv_item_request_update(GANV_ITEM(text));
+}
+
+static void
+ganv_text_get_property(GObject*    object,
+                       guint       prop_id,
+                       GValue*     value,
+                       GParamSpec* pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_TEXT(object));
+
+	GanvText*        text = GANV_TEXT(object);
+	GanvTextPrivate* impl = text->impl;
+
+	if (impl->needs_layout && (prop_id == PROP_WIDTH
+	                           || prop_id == PROP_HEIGHT)) {
+		ganv_text_layout(text);
+	}
+
+	switch (prop_id) {
+		GET_CASE(TEXT, string, impl->text);
+		GET_CASE(X, double, impl->coords.x);
+		GET_CASE(Y, double, impl->coords.y);
+		GET_CASE(WIDTH, double, impl->coords.width);
+		GET_CASE(HEIGHT, double, impl->coords.height);
+		GET_CASE(COLOR, uint, impl->color);
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_text_bounds_item(GanvItem* item,
+                      double* x1, double* y1,
+                      double* x2, double* y2)
+{
+	GanvText*        text = GANV_TEXT(item);
+	GanvTextPrivate* impl = text->impl;
+
+	if (impl->needs_layout) {
+		ganv_text_layout(text);
+	}
+
+	*x1 = impl->coords.x;
+	*y1 = impl->coords.y;
+	*x2 = impl->coords.x + impl->coords.width;
+	*y2 = impl->coords.y + impl->coords.height;
+}
+
+static void
+ganv_text_bounds(GanvItem* item,
+                 double* x1, double* y1,
+                 double* x2, double* y2)
+{
+	ganv_text_bounds_item(item, x1, y1, x2, y2);
+}
+
+static void
+ganv_text_update(GanvItem* item, int flags)
+{
+	// Update world-relative bounding box
+	ganv_text_bounds(item, &item->impl->x1, &item->impl->y1, &item->impl->x2, &item->impl->y2);
+	ganv_item_i2w_pair(item, &item->impl->x1, &item->impl->y1, &item->impl->x2, &item->impl->y2);
+
+	ganv_canvas_request_redraw_w(
+		item->impl->canvas, item->impl->x1, item->impl->y1, item->impl->x2, item->impl->y2);
+
+	parent_class->update(item, flags);
+}
+
+static double
+ganv_text_point(GanvItem* item, double x, double y, GanvItem** actual_item)
+{
+	*actual_item = NULL;
+
+	double x1, y1, x2, y2;
+	ganv_text_bounds_item(item, &x1, &y1, &x2, &y2);
+	if ((x >= x1) && (y >= y1) && (x <= x2) && (y <= y2)) {
+		return 0.0;
+	}
+
+	// Point is outside the box
+	double dx, dy;
+
+	// Find horizontal distance to nearest edge
+	if (x < x1) {
+		dx = x1 - x;
+	} else if (x > x2) {
+		dx = x - x2;
+	} else {
+		dx = 0.0;
+	}
+
+	// Find vertical distance to nearest edge
+	if (y < y1) {
+		dy = y1 - y;
+	} else if (y > y2) {
+		dy = y - y2;
+	} else {
+		dy = 0.0;
+	}
+
+	return sqrt((dx * dx) + (dy * dy));
+}
+
+static void
+ganv_text_draw(GanvItem* item,
+               cairo_t* cr, double cx, double cy, double cw, double ch)
+{
+	GanvText*        text = GANV_TEXT(item);
+	GanvTextPrivate* impl = text->impl;
+
+	double wx = impl->coords.x;
+	double wy = impl->coords.y;
+	ganv_item_i2w(item, &wx, &wy);
+
+	if (impl->needs_layout) {
+		ganv_text_layout(text);
+	}
+
+	double r, g, b, a;
+	color_to_rgba(impl->color, &r, &g, &b, &a);
+
+	cairo_set_source_rgba(cr, r, g, b, a);
+	cairo_move_to(cr, wx, wy);
+	pango_cairo_show_layout(cr, impl->layout);
+}
+
+static void
+ganv_text_class_init(GanvTextClass* klass)
+{
+	GObjectClass*   gobject_class = (GObjectClass*)klass;
+	GtkObjectClass* object_class  = (GtkObjectClass*)klass;
+	GanvItemClass*  item_class    = (GanvItemClass*)klass;
+
+	parent_class = GANV_ITEM_CLASS(g_type_class_peek_parent(klass));
+
+	gobject_class->set_property = ganv_text_set_property;
+	gobject_class->get_property = ganv_text_get_property;
+
+	g_object_class_install_property(
+		gobject_class, PROP_TEXT, g_param_spec_string(
+			"text",
+			_("Text"),
+			_("The string to display."),
+			NULL,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_X, g_param_spec_double(
+			"x",
+			_("x"),
+			_("Top left x coordinate."),
+			-G_MAXDOUBLE, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_Y, g_param_spec_double(
+			"y",
+			_("y"),
+			_("Top left y coordinate."),
+			-G_MAXDOUBLE, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_WIDTH, g_param_spec_double(
+			"width",
+			_("Width"),
+			_("The current width of the text."),
+			-G_MAXDOUBLE, G_MAXDOUBLE,
+			1.0,
+			G_PARAM_READABLE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_HEIGHT, g_param_spec_double(
+			"height",
+			_("Height"),
+			_("The current height of the text."),
+			-G_MAXDOUBLE, G_MAXDOUBLE,
+			1.0,
+			G_PARAM_READABLE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_COLOR, g_param_spec_uint(
+			"color",
+			_("Color"),
+			_("The color of the text."),
+			0, G_MAXUINT,
+			DEFAULT_TEXT_COLOR,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_FONT_SIZE, g_param_spec_double(
+			"font-size",
+			_("Font size"),
+			_("The font size in points."),
+			-G_MAXDOUBLE, G_MAXDOUBLE,
+			0.0,
+			G_PARAM_READWRITE));
+
+
+	object_class->destroy = ganv_text_destroy;
+
+	item_class->update = ganv_text_update;
+	item_class->bounds = ganv_text_bounds;
+	item_class->point  = ganv_text_point;
+	item_class->draw   = ganv_text_draw;
+}
diff --git a/src/widget.c b/src/widget.c
new file mode 100644
index 0000000..b08715b
--- /dev/null
+++ b/src/widget.c
@@ -0,0 +1,503 @@
+/* This file is part of Ganv.
+ * Copyright 2007-2016 David Robillard <http://drobilla.net>
+ *
+ * Ganv is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or any later version.
+ *
+ * Ganv is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Ganv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Based on GnomeCanvasWidget, by Federico Mena <federico@nuclecu.unam.mx>
+ * Copyright 1997-2000 Free Software Foundation
+ */
+
+#include <math.h>
+
+#include <gtk/gtksignal.h>
+
+#include "ganv/canvas.h"
+#include "ganv/widget.h"
+
+#include "./gettext.h"
+#include "./ganv-private.h"
+
+G_DEFINE_TYPE_WITH_CODE(GanvWidget, ganv_widget, GANV_TYPE_ITEM,
+                        G_ADD_PRIVATE(GanvWidget))
+
+static GanvItemClass* parent_class;
+
+enum {
+	PROP_0,
+	PROP_WIDGET,
+	PROP_X,
+	PROP_Y,
+	PROP_WIDTH,
+	PROP_HEIGHT,
+	PROP_ANCHOR,
+	PROP_SIZE_PIXELS
+};
+
+static void
+ganv_widget_init(GanvWidget* witem)
+{
+	GanvWidgetPrivate* impl = ganv_widget_get_instance_private(witem);
+
+	witem->impl              = impl;
+	witem->impl->x           = 0.0;
+	witem->impl->y           = 0.0;
+	witem->impl->width       = 0.0;
+	witem->impl->height      = 0.0;
+	witem->impl->anchor      = GTK_ANCHOR_NW;
+	witem->impl->size_pixels = FALSE;
+}
+
+static void
+ganv_widget_destroy(GtkObject* object)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_WIDGET(object));
+
+	GanvWidget* witem = GANV_WIDGET(object);
+
+	if (witem->impl->widget && !witem->impl->in_destroy) {
+		g_signal_handler_disconnect(witem->impl->widget, witem->impl->destroy_id);
+		gtk_widget_destroy(witem->impl->widget);
+		witem->impl->widget = NULL;
+	}
+
+	if (GTK_OBJECT_CLASS(parent_class)->destroy) {
+		(*GTK_OBJECT_CLASS(parent_class)->destroy)(object);
+	}
+}
+
+static void
+recalc_bounds(GanvWidget* witem)
+{
+	GanvItem* item = GANV_ITEM(witem);
+
+	/* Get world coordinates */
+
+	double wx = witem->impl->x;
+	double wy = witem->impl->y;
+	ganv_item_i2w(item, &wx, &wy);
+
+	/* Get canvas pixel coordinates */
+
+	ganv_canvas_w2c(item->impl->canvas, wx, wy, &witem->impl->cx, &witem->impl->cy);
+
+	/* Anchor widget item */
+
+	switch (witem->impl->anchor) {
+	case GTK_ANCHOR_N:
+	case GTK_ANCHOR_CENTER:
+	case GTK_ANCHOR_S:
+		witem->impl->cx -= witem->impl->cwidth / 2;
+		break;
+
+	case GTK_ANCHOR_NE:
+	case GTK_ANCHOR_E:
+	case GTK_ANCHOR_SE:
+		witem->impl->cx -= witem->impl->cwidth;
+		break;
+
+	default:
+		break;
+	}
+
+	switch (witem->impl->anchor) {
+	case GTK_ANCHOR_W:
+	case GTK_ANCHOR_CENTER:
+	case GTK_ANCHOR_E:
+		witem->impl->cy -= witem->impl->cheight / 2;
+		break;
+
+	case GTK_ANCHOR_SW:
+	case GTK_ANCHOR_S:
+	case GTK_ANCHOR_SE:
+		witem->impl->cy -= witem->impl->cheight;
+		break;
+
+	default:
+		break;
+	}
+
+	/* Bounds */
+
+	item->impl->x1 = witem->impl->cx;
+	item->impl->y1 = witem->impl->cy;
+	item->impl->x2 = witem->impl->cx + witem->impl->cwidth;
+	item->impl->y2 = witem->impl->cy + witem->impl->cheight;
+
+	int zoom_xofs, zoom_yofs;
+	ganv_canvas_get_zoom_offsets(item->impl->canvas, &zoom_xofs, &zoom_yofs);
+	if (witem->impl->widget) {
+		gtk_layout_move(GTK_LAYOUT(item->impl->canvas), witem->impl->widget,
+		                witem->impl->cx + zoom_xofs,
+		                witem->impl->cy + zoom_yofs);
+	}
+}
+
+static void
+do_destroy(GtkObject* object, gpointer data)
+{
+	GanvWidget* witem = GANV_WIDGET(data);
+
+	witem->impl->in_destroy = TRUE;
+	gtk_object_destroy(GTK_OBJECT(data));
+}
+
+static void
+ganv_widget_set_property(GObject*      object,
+                         guint         param_id,
+                         const GValue* value,
+                         GParamSpec*   pspec)
+{
+	GanvItem*   item        = GANV_ITEM(object);
+	GanvWidget* witem       = GANV_WIDGET(object);
+	int         update      = FALSE;
+	int         calc_bounds = FALSE;
+	GObject*    obj;
+
+	switch (param_id) {
+	case PROP_WIDGET:
+		if (witem->impl->widget) {
+			g_signal_handler_disconnect(witem->impl->widget, witem->impl->destroy_id);
+			gtk_container_remove(GTK_CONTAINER(item->impl->canvas), witem->impl->widget);
+		}
+
+		obj = (GObject*)g_value_get_object(value);
+		if (obj) {
+			witem->impl->widget     = GTK_WIDGET(obj);
+			witem->impl->destroy_id = g_signal_connect(obj, "destroy",
+			                                     G_CALLBACK(do_destroy),
+			                                     witem);
+			int zoom_xofs, zoom_yofs;
+			ganv_canvas_get_zoom_offsets(item->impl->canvas, &zoom_xofs, &zoom_yofs);
+
+			gtk_layout_put(GTK_LAYOUT(item->impl->canvas), witem->impl->widget,
+			               witem->impl->cx + zoom_xofs,
+			               witem->impl->cy + zoom_yofs);
+		}
+
+		update = TRUE;
+		break;
+
+	case PROP_X:
+		if (witem->impl->x != g_value_get_double(value)) {
+			witem->impl->x    = g_value_get_double(value);
+			calc_bounds = TRUE;
+		}
+		break;
+
+	case PROP_Y:
+		if (witem->impl->y != g_value_get_double(value)) {
+			witem->impl->y    = g_value_get_double(value);
+			calc_bounds = TRUE;
+		}
+		break;
+
+	case PROP_WIDTH:
+		if (witem->impl->width != fabs(g_value_get_double(value))) {
+			witem->impl->width = fabs(g_value_get_double(value));
+			update       = TRUE;
+		}
+		break;
+
+	case PROP_HEIGHT:
+		if (witem->impl->height != fabs(g_value_get_double(value))) {
+			witem->impl->height = fabs(g_value_get_double(value));
+			update        = TRUE;
+		}
+		break;
+
+	case PROP_ANCHOR:
+		if (witem->impl->anchor != (GtkAnchorType)g_value_get_enum(value)) {
+			witem->impl->anchor = (GtkAnchorType)g_value_get_enum(value);
+			update        = TRUE;
+		}
+		break;
+
+	case PROP_SIZE_PIXELS:
+		if (witem->impl->size_pixels != g_value_get_boolean(value)) {
+			witem->impl->size_pixels = g_value_get_boolean(value);
+			update             = TRUE;
+		}
+		break;
+
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, param_id, pspec);
+		break;
+	}
+
+	if (update) {
+		(*GANV_ITEM_GET_CLASS(item)->update)(item, 0);
+	}
+
+	if (calc_bounds) {
+		recalc_bounds(witem);
+	}
+}
+
+static void
+ganv_widget_get_property(GObject*    object,
+                         guint       param_id,
+                         GValue*     value,
+                         GParamSpec* pspec)
+{
+	g_return_if_fail(object != NULL);
+	g_return_if_fail(GANV_IS_WIDGET(object));
+
+	GanvWidget* witem = GANV_WIDGET(object);
+
+	switch (param_id) {
+	case PROP_WIDGET:
+		g_value_set_object(value, (GObject*)witem->impl->widget);
+		break;
+
+	case PROP_X:
+		g_value_set_double(value, witem->impl->x);
+		break;
+
+	case PROP_Y:
+		g_value_set_double(value, witem->impl->y);
+		break;
+
+	case PROP_WIDTH:
+		g_value_set_double(value, witem->impl->width);
+		break;
+
+	case PROP_HEIGHT:
+		g_value_set_double(value, witem->impl->height);
+		break;
+
+	case PROP_ANCHOR:
+		g_value_set_enum(value, witem->impl->anchor);
+		break;
+
+	case PROP_SIZE_PIXELS:
+		g_value_set_boolean(value, witem->impl->size_pixels);
+		break;
+
+	default:
+		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, param_id, pspec);
+		break;
+	}
+}
+
+static void
+ganv_widget_update(GanvItem* item, int flags)
+{
+	GanvWidget* witem = GANV_WIDGET(item);
+
+	if (parent_class->update) {
+		(*parent_class->update)(item, flags);
+	}
+
+	if (witem->impl->widget) {
+		const double pixels_per_unit = ganv_canvas_get_zoom(item->impl->canvas);
+		if (witem->impl->size_pixels) {
+			witem->impl->cwidth  = (int)(witem->impl->width + 0.5);
+			witem->impl->cheight = (int)(witem->impl->height + 0.5);
+		} else {
+			witem->impl->cwidth  = (int)(witem->impl->width * pixels_per_unit + 0.5);
+			witem->impl->cheight = (int)(witem->impl->height * pixels_per_unit + 0.5);
+		}
+
+		gtk_widget_set_size_request(witem->impl->widget, witem->impl->cwidth, witem->impl->cheight);
+	} else {
+		witem->impl->cwidth  = 0.0;
+		witem->impl->cheight = 0.0;
+	}
+
+	recalc_bounds(witem);
+}
+
+static void
+ganv_widget_draw(GanvItem* item,
+                 cairo_t* cr, double cx, double cy, double cw, double ch)
+{
+	GanvWidget* witem = GANV_WIDGET(item);
+
+	if (witem->impl->widget) {
+		gtk_widget_queue_draw(witem->impl->widget);
+	}
+}
+
+static double
+ganv_widget_point(GanvItem* item, double x, double y, GanvItem** actual_item)
+{
+	GanvWidget* witem = GANV_WIDGET(item);
+
+	*actual_item = item;
+
+	double x1, y1;
+	ganv_canvas_c2w(item->impl->canvas, witem->impl->cx, witem->impl->cy, &x1, &y1);
+
+	const double pixels_per_unit = ganv_canvas_get_zoom(item->impl->canvas);
+
+	double x2 = x1 + (witem->impl->cwidth - 1) / pixels_per_unit;
+	double y2 = y1 + (witem->impl->cheight - 1) / pixels_per_unit;
+
+	/* Is point inside widget bounds? */
+
+	if ((x >= x1) && (y >= y1) && (x <= x2) && (y <= y2)) {
+		return 0.0;
+	}
+
+	/* Point is outside widget bounds */
+
+	double dx;
+	if (x < x1) {
+		dx = x1 - x;
+	} else if (x > x2) {
+		dx = x - x2;
+	} else {
+		dx = 0.0;
+	}
+
+	double dy;
+	if (y < y1) {
+		dy = y1 - y;
+	} else if (y > y2) {
+		dy = y - y2;
+	} else {
+		dy = 0.0;
+	}
+
+	return sqrt(dx * dx + dy * dy);
+}
+
+static void
+ganv_widget_bounds(GanvItem* item, double* x1, double* y1, double* x2, double* y2)
+{
+	GanvWidget* witem = GANV_WIDGET(item);
+
+	*x1 = witem->impl->x;
+	*y1 = witem->impl->y;
+
+	switch (witem->impl->anchor) {
+	case GTK_ANCHOR_NW:
+	case GTK_ANCHOR_W:
+	case GTK_ANCHOR_SW:
+		break;
+
+	case GTK_ANCHOR_N:
+	case GTK_ANCHOR_CENTER:
+	case GTK_ANCHOR_S:
+		*x1 -= witem->impl->width / 2.0;
+		break;
+
+	case GTK_ANCHOR_NE:
+	case GTK_ANCHOR_E:
+	case GTK_ANCHOR_SE:
+		*x1 -= witem->impl->width;
+		break;
+
+	default:
+		break;
+	}
+
+	switch (witem->impl->anchor) {
+	case GTK_ANCHOR_NW:
+	case GTK_ANCHOR_N:
+	case GTK_ANCHOR_NE:
+		break;
+
+	case GTK_ANCHOR_W:
+	case GTK_ANCHOR_CENTER:
+	case GTK_ANCHOR_E:
+		*y1 -= witem->impl->height / 2.0;
+		break;
+
+	case GTK_ANCHOR_SW:
+	case GTK_ANCHOR_S:
+	case GTK_ANCHOR_SE:
+		*y1 -= witem->impl->height;
+		break;
+
+	default:
+		break;
+	}
+
+	*x2 = *x1 + witem->impl->width;
+	*y2 = *y1 + witem->impl->height;
+}
+
+static void
+ganv_widget_class_init(GanvWidgetClass* klass)
+{
+	GObjectClass*   gobject_class = (GObjectClass*)klass;
+	GtkObjectClass* object_class  = (GtkObjectClass*)klass;
+	GanvItemClass*  item_class    = (GanvItemClass*)klass;
+
+	parent_class = (GanvItemClass*)g_type_class_peek_parent(klass);
+
+	gobject_class->set_property = ganv_widget_set_property;
+	gobject_class->get_property = ganv_widget_get_property;
+
+	g_object_class_install_property(
+		gobject_class, PROP_WIDGET, g_param_spec_object(
+			"widget", _("Widget"),
+			_("The widget to embed in this item."),
+			GTK_TYPE_WIDGET,
+			(GParamFlags)(G_PARAM_READABLE | G_PARAM_WRITABLE)));
+
+	g_object_class_install_property(
+		gobject_class, PROP_X, g_param_spec_double(
+			"x", _("x"),
+			_("The x coordinate of the anchor"),
+			-G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_Y, g_param_spec_double(
+			"y", _("y"),
+			_("The x coordinate of the anchor"),
+			-G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_WIDTH, g_param_spec_double(
+			"width", _("Width"),
+			_("The width of the widget."),
+			-G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_HEIGHT, g_param_spec_double(
+			"height", _("Height"),
+			_("The height of the widget."),
+			-G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_ANCHOR, g_param_spec_enum(
+			"anchor", _("Anchor"),
+			_("The anchor point of the widget."),
+			GTK_TYPE_ANCHOR_TYPE,
+			GTK_ANCHOR_NW,
+			G_PARAM_READWRITE));
+
+	g_object_class_install_property(
+		gobject_class, PROP_SIZE_PIXELS, g_param_spec_boolean(
+			"size-pixels", ("Size is in pixels"),
+			_("Specifies whether the widget size is specified in pixels or"
+			  " canvas units. If it is in pixels, then the widget will not"
+			  " be scaled when the canvas zoom factor changes.  Otherwise,"
+			  " it will be scaled."),
+			FALSE,
+			G_PARAM_READWRITE));
+
+	object_class->destroy = ganv_widget_destroy;
+
+	item_class->update = ganv_widget_update;
+	item_class->point  = ganv_widget_point;
+	item_class->bounds = ganv_widget_bounds;
+	item_class->draw   = ganv_widget_draw;
+}
diff --git a/.gitignore b/waflib/.gitignore
index 8d35cb3..8d35cb3 100644
--- a/.gitignore
+++ b/waflib/.gitignore
diff --git a/Build.py b/waflib/Build.py
index 8143dbc..8143dbc 100644
--- a/Build.py
+++ b/waflib/Build.py
diff --git a/waflib/COPYING b/waflib/COPYING
new file mode 100644
index 0000000..a4147d2
--- /dev/null
+++ b/waflib/COPYING
@@ -0,0 +1,25 @@
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+3. The name of the author may not be used to endorse or promote products
+   derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
diff --git a/ConfigSet.py b/waflib/ConfigSet.py
index 901fba6..901fba6 100644
--- a/ConfigSet.py
+++ b/waflib/ConfigSet.py
diff --git a/Configure.py b/waflib/Configure.py
index db09c0e..db09c0e 100644
--- a/Configure.py
+++ b/waflib/Configure.py
diff --git a/Context.py b/waflib/Context.py
index 876ea46..876ea46 100644
--- a/Context.py
+++ b/waflib/Context.py
diff --git a/Errors.py b/waflib/Errors.py
index bf75c1b..bf75c1b 100644
--- a/Errors.py
+++ b/waflib/Errors.py
diff --git a/Logs.py b/waflib/Logs.py
index 11dc34f..11dc34f 100644
--- a/Logs.py
+++ b/waflib/Logs.py
diff --git a/Node.py b/waflib/Node.py
index 4ac1ea8..4ac1ea8 100644
--- a/Node.py
+++ b/waflib/Node.py
diff --git a/Options.py b/waflib/Options.py
index ad802d4..ad802d4 100644
--- a/Options.py
+++ b/waflib/Options.py
diff --git a/README.md b/waflib/README.md
index c5361b9..c5361b9 100644
--- a/README.md
+++ b/waflib/README.md
diff --git a/Runner.py b/waflib/Runner.py
index 5d27669..5d27669 100644
--- a/Runner.py
+++ b/waflib/Runner.py
diff --git a/Scripting.py b/waflib/Scripting.py
index ae17a8b..ae17a8b 100644
--- a/Scripting.py
+++ b/waflib/Scripting.py
diff --git a/Task.py b/waflib/Task.py
index cb49a73..cb49a73 100644
--- a/Task.py
+++ b/waflib/Task.py
diff --git a/TaskGen.py b/waflib/TaskGen.py
index 532b7d5..532b7d5 100644
--- a/TaskGen.py
+++ b/waflib/TaskGen.py
diff --git a/Tools/__init__.py b/waflib/Tools/__init__.py
index 079df35..079df35 100644
--- a/Tools/__init__.py
+++ b/waflib/Tools/__init__.py
diff --git a/Tools/ar.py b/waflib/Tools/ar.py
index b39b645..b39b645 100644
--- a/Tools/ar.py
+++ b/waflib/Tools/ar.py
diff --git a/Tools/asm.py b/waflib/Tools/asm.py
index b6f26fb..b6f26fb 100644
--- a/Tools/asm.py
+++ b/waflib/Tools/asm.py
diff --git a/Tools/bison.py b/waflib/Tools/bison.py
index eef56dc..eef56dc 100644
--- a/Tools/bison.py
+++ b/waflib/Tools/bison.py
diff --git a/Tools/c.py b/waflib/Tools/c.py
index effd6b6..effd6b6 100644
--- a/Tools/c.py
+++ b/waflib/Tools/c.py
diff --git a/Tools/c_aliases.py b/waflib/Tools/c_aliases.py
index c9d5369..c9d5369 100644
--- a/Tools/c_aliases.py
+++ b/waflib/Tools/c_aliases.py
diff --git a/Tools/c_config.py b/waflib/Tools/c_config.py
index d546be9..d546be9 100644
--- a/Tools/c_config.py
+++ b/waflib/Tools/c_config.py
diff --git a/Tools/c_osx.py b/waflib/Tools/c_osx.py
index f70b128..f70b128 100644
--- a/Tools/c_osx.py
+++ b/waflib/Tools/c_osx.py
diff --git a/Tools/c_preproc.py b/waflib/Tools/c_preproc.py
index 68e5f5a..68e5f5a 100644
--- a/Tools/c_preproc.py
+++ b/waflib/Tools/c_preproc.py
diff --git a/Tools/c_tests.py b/waflib/Tools/c_tests.py
index f858df5..f858df5 100644
--- a/Tools/c_tests.py
+++ b/waflib/Tools/c_tests.py
diff --git a/Tools/ccroot.py b/waflib/Tools/ccroot.py
index 579d5b2..579d5b2 100644
--- a/Tools/ccroot.py
+++ b/waflib/Tools/ccroot.py
diff --git a/Tools/clang.py b/waflib/Tools/clang.py
index 3828e39..3828e39 100644
--- a/Tools/clang.py
+++ b/waflib/Tools/clang.py
diff --git a/Tools/clangxx.py b/waflib/Tools/clangxx.py
index 152013c..152013c 100644
--- a/Tools/clangxx.py
+++ b/waflib/Tools/clangxx.py
diff --git a/Tools/compiler_c.py b/waflib/Tools/compiler_c.py
index 2dba3f8..2dba3f8 100644
--- a/Tools/compiler_c.py
+++ b/waflib/Tools/compiler_c.py
diff --git a/Tools/compiler_cxx.py b/waflib/Tools/compiler_cxx.py
index 1af65a2..1af65a2 100644
--- a/Tools/compiler_cxx.py
+++ b/waflib/Tools/compiler_cxx.py
diff --git a/Tools/compiler_d.py b/waflib/Tools/compiler_d.py
index 43bb1f6..43bb1f6 100644
--- a/Tools/compiler_d.py
+++ b/waflib/Tools/compiler_d.py
diff --git a/Tools/compiler_fc.py b/waflib/Tools/compiler_fc.py
index 96b58e7..96b58e7 100644
--- a/Tools/compiler_fc.py
+++ b/waflib/Tools/compiler_fc.py
diff --git a/Tools/cs.py b/waflib/Tools/cs.py
index aecca6d..aecca6d 100644
--- a/Tools/cs.py
+++ b/waflib/Tools/cs.py
diff --git a/Tools/cxx.py b/waflib/Tools/cxx.py
index 194fad7..194fad7 100644
--- a/Tools/cxx.py
+++ b/waflib/Tools/cxx.py
diff --git a/Tools/d.py b/waflib/Tools/d.py
index e4cf73b..e4cf73b 100644
--- a/Tools/d.py
+++ b/waflib/Tools/d.py
diff --git a/Tools/d_config.py b/waflib/Tools/d_config.py
index 6637556..6637556 100644
--- a/Tools/d_config.py
+++ b/waflib/Tools/d_config.py
diff --git a/Tools/d_scan.py b/waflib/Tools/d_scan.py
index 4e807a6..4e807a6 100644
--- a/Tools/d_scan.py
+++ b/waflib/Tools/d_scan.py
diff --git a/Tools/dbus.py b/waflib/Tools/dbus.py
index d520f1c..d520f1c 100644
--- a/Tools/dbus.py
+++ b/waflib/Tools/dbus.py
diff --git a/Tools/dmd.py b/waflib/Tools/dmd.py
index 8917ca1..8917ca1 100644
--- a/Tools/dmd.py
+++ b/waflib/Tools/dmd.py
diff --git a/Tools/errcheck.py b/waflib/Tools/errcheck.py
index de8d75a..de8d75a 100644
--- a/Tools/errcheck.py
+++ b/waflib/Tools/errcheck.py
diff --git a/Tools/fc.py b/waflib/Tools/fc.py
index fd4d39c..fd4d39c 100644
--- a/Tools/fc.py
+++ b/waflib/Tools/fc.py
diff --git a/Tools/fc_config.py b/waflib/Tools/fc_config.py
index dc5e5c9..dc5e5c9 100644
--- a/Tools/fc_config.py
+++ b/waflib/Tools/fc_config.py
diff --git a/Tools/fc_scan.py b/waflib/Tools/fc_scan.py
index 0824c92..0824c92 100644
--- a/Tools/fc_scan.py
+++ b/waflib/Tools/fc_scan.py
diff --git a/Tools/flex.py b/waflib/Tools/flex.py
index 2256657..2256657 100644
--- a/Tools/flex.py
+++ b/waflib/Tools/flex.py
diff --git a/Tools/g95.py b/waflib/Tools/g95.py
index f69ba4f..f69ba4f 100644
--- a/Tools/g95.py
+++ b/waflib/Tools/g95.py
diff --git a/Tools/gas.py b/waflib/Tools/gas.py
index 77afed7..77afed7 100644
--- a/Tools/gas.py
+++ b/waflib/Tools/gas.py
diff --git a/Tools/gcc.py b/waflib/Tools/gcc.py
index acdd473..acdd473 100644
--- a/Tools/gcc.py
+++ b/waflib/Tools/gcc.py
diff --git a/Tools/gdc.py b/waflib/Tools/gdc.py
index d89a66d..d89a66d 100644
--- a/Tools/gdc.py
+++ b/waflib/Tools/gdc.py
diff --git a/Tools/gfortran.py b/waflib/Tools/gfortran.py
index 1050667..1050667 100644
--- a/Tools/gfortran.py
+++ b/waflib/Tools/gfortran.py
diff --git a/Tools/glib2.py b/waflib/Tools/glib2.py
index 949fe37..949fe37 100644
--- a/Tools/glib2.py
+++ b/waflib/Tools/glib2.py
diff --git a/Tools/gnu_dirs.py b/waflib/Tools/gnu_dirs.py
index 2847071..2847071 100644
--- a/Tools/gnu_dirs.py
+++ b/waflib/Tools/gnu_dirs.py
diff --git a/Tools/gxx.py b/waflib/Tools/gxx.py
index 22c5d26..22c5d26 100644
--- a/Tools/gxx.py
+++ b/waflib/Tools/gxx.py
diff --git a/Tools/icc.py b/waflib/Tools/icc.py
index b6492c8..b6492c8 100644
--- a/Tools/icc.py
+++ b/waflib/Tools/icc.py
diff --git a/Tools/icpc.py b/waflib/Tools/icpc.py
index 8a6cc6c..8a6cc6c 100644
--- a/Tools/icpc.py
+++ b/waflib/Tools/icpc.py
diff --git a/Tools/ifort.py b/waflib/Tools/ifort.py
index 17d3052..17d3052 100644
--- a/Tools/ifort.py
+++ b/waflib/Tools/ifort.py
diff --git a/Tools/intltool.py b/waflib/Tools/intltool.py
index af95ba8..af95ba8 100644
--- a/Tools/intltool.py
+++ b/waflib/Tools/intltool.py
diff --git a/Tools/irixcc.py b/waflib/Tools/irixcc.py
index c3ae1ac..c3ae1ac 100644
--- a/Tools/irixcc.py
+++ b/waflib/Tools/irixcc.py
diff --git a/Tools/javaw.py b/waflib/Tools/javaw.py
index 9daed39..9daed39 100644
--- a/Tools/javaw.py
+++ b/waflib/Tools/javaw.py
diff --git a/Tools/ldc2.py b/waflib/Tools/ldc2.py
index a51c344..a51c344 100644
--- a/Tools/ldc2.py
+++ b/waflib/Tools/ldc2.py
diff --git a/Tools/lua.py b/waflib/Tools/lua.py
index 15a333a..15a333a 100644
--- a/Tools/lua.py
+++ b/waflib/Tools/lua.py
diff --git a/Tools/md5_tstamp.py b/waflib/Tools/md5_tstamp.py
index 2a58792..2a58792 100644
--- a/Tools/md5_tstamp.py
+++ b/waflib/Tools/md5_tstamp.py
diff --git a/Tools/msvc.py b/waflib/Tools/msvc.py
index ff58449..ff58449 100644
--- a/Tools/msvc.py
+++ b/waflib/Tools/msvc.py
diff --git a/Tools/nasm.py b/waflib/Tools/nasm.py
index 411d582..411d582 100644
--- a/Tools/nasm.py
+++ b/waflib/Tools/nasm.py
diff --git a/Tools/nobuild.py b/waflib/Tools/nobuild.py
index 2e4b055..2e4b055 100644
--- a/Tools/nobuild.py
+++ b/waflib/Tools/nobuild.py
diff --git a/Tools/perl.py b/waflib/Tools/perl.py
index 32b03fb..32b03fb 100644
--- a/Tools/perl.py
+++ b/waflib/Tools/perl.py
diff --git a/Tools/python.py b/waflib/Tools/python.py
index 01a2c9a..01a2c9a 100644
--- a/Tools/python.py
+++ b/waflib/Tools/python.py
diff --git a/Tools/qt5.py b/waflib/Tools/qt5.py
index 9f43280..9f43280 100644
--- a/Tools/qt5.py
+++ b/waflib/Tools/qt5.py
diff --git a/Tools/ruby.py b/waflib/Tools/ruby.py
index 8d92a79..8d92a79 100644
--- a/Tools/ruby.py
+++ b/waflib/Tools/ruby.py
diff --git a/Tools/suncc.py b/waflib/Tools/suncc.py
index 33d34fc..33d34fc 100644
--- a/Tools/suncc.py
+++ b/waflib/Tools/suncc.py
diff --git a/Tools/suncxx.py b/waflib/Tools/suncxx.py
index 3b384f6..3b384f6 100644
--- a/Tools/suncxx.py
+++ b/waflib/Tools/suncxx.py
diff --git a/Tools/tex.py b/waflib/Tools/tex.py
index eaf9fdb..eaf9fdb 100644
--- a/Tools/tex.py
+++ b/waflib/Tools/tex.py
diff --git a/Tools/vala.py b/waflib/Tools/vala.py
index 822ec50..822ec50 100644
--- a/Tools/vala.py
+++ b/waflib/Tools/vala.py
diff --git a/Tools/waf_unit_test.py b/waflib/Tools/waf_unit_test.py
index 74d6c05..74d6c05 100644
--- a/Tools/waf_unit_test.py
+++ b/waflib/Tools/waf_unit_test.py
diff --git a/Tools/winres.py b/waflib/Tools/winres.py
index 9be1ed6..9be1ed6 100644
--- a/Tools/winres.py
+++ b/waflib/Tools/winres.py
diff --git a/Tools/xlc.py b/waflib/Tools/xlc.py
index 134dd41..134dd41 100644
--- a/Tools/xlc.py
+++ b/waflib/Tools/xlc.py
diff --git a/Tools/xlcxx.py b/waflib/Tools/xlcxx.py
index 76aa59b..76aa59b 100644
--- a/Tools/xlcxx.py
+++ b/waflib/Tools/xlcxx.py
diff --git a/Utils.py b/waflib/Utils.py
index 4b808a8..4b808a8 100644
--- a/Utils.py
+++ b/waflib/Utils.py
diff --git a/__init__.py b/waflib/__init__.py
index 079df35..079df35 100644
--- a/__init__.py
+++ b/waflib/__init__.py
diff --git a/ansiterm.py b/waflib/ansiterm.py
index 027f0ad..027f0ad 100644
--- a/ansiterm.py
+++ b/waflib/ansiterm.py
diff --git a/extras/__init__.py b/waflib/extras/__init__.py
index c8a3c34..c8a3c34 100644
--- a/extras/__init__.py
+++ b/waflib/extras/__init__.py
diff --git a/extras/autowaf.py b/waflib/extras/autowaf.py
index d779967..d779967 100644
--- a/extras/autowaf.py
+++ b/waflib/extras/autowaf.py
diff --git a/extras/batched_cc.py b/waflib/extras/batched_cc.py
index aad2872..aad2872 100644
--- a/extras/batched_cc.py
+++ b/waflib/extras/batched_cc.py
diff --git a/extras/biber.py b/waflib/extras/biber.py
index fd9db4e..fd9db4e 100644
--- a/extras/biber.py
+++ b/waflib/extras/biber.py
diff --git a/extras/bjam.py b/waflib/extras/bjam.py
index 8e04d3a..8e04d3a 100644
--- a/extras/bjam.py
+++ b/waflib/extras/bjam.py
diff --git a/extras/blender.py b/waflib/extras/blender.py
index e5efc28..e5efc28 100644
--- a/extras/blender.py
+++ b/waflib/extras/blender.py
diff --git a/extras/boo.py b/waflib/extras/boo.py
index 06623d4..06623d4 100644
--- a/extras/boo.py
+++ b/waflib/extras/boo.py
diff --git a/extras/boost.py b/waflib/extras/boost.py
index c2aaaa9..c2aaaa9 100644
--- a/extras/boost.py
+++ b/waflib/extras/boost.py
diff --git a/extras/build_file_tracker.py b/waflib/extras/build_file_tracker.py
index c4f26fd..c4f26fd 100644
--- a/extras/build_file_tracker.py
+++ b/waflib/extras/build_file_tracker.py
diff --git a/extras/build_logs.py b/waflib/extras/build_logs.py
index cdf8ed0..cdf8ed0 100644
--- a/extras/build_logs.py
+++ b/waflib/extras/build_logs.py
diff --git a/extras/buildcopy.py b/waflib/extras/buildcopy.py
index eaff7e6..eaff7e6 100644
--- a/extras/buildcopy.py
+++ b/waflib/extras/buildcopy.py
diff --git a/extras/c_bgxlc.py b/waflib/extras/c_bgxlc.py
index 6e3eaf7..6e3eaf7 100644
--- a/extras/c_bgxlc.py
+++ b/waflib/extras/c_bgxlc.py
diff --git a/extras/c_dumbpreproc.py b/waflib/extras/c_dumbpreproc.py
index ce9e1a4..ce9e1a4 100644
--- a/extras/c_dumbpreproc.py
+++ b/waflib/extras/c_dumbpreproc.py
diff --git a/extras/c_emscripten.py b/waflib/extras/c_emscripten.py
index e1ac494..e1ac494 100644
--- a/extras/c_emscripten.py
+++ b/waflib/extras/c_emscripten.py
diff --git a/extras/c_nec.py b/waflib/extras/c_nec.py
index 96bfae4..96bfae4 100644
--- a/extras/c_nec.py
+++ b/waflib/extras/c_nec.py
diff --git a/extras/cabal.py b/waflib/extras/cabal.py
index e10a0d1..e10a0d1 100644
--- a/extras/cabal.py
+++ b/waflib/extras/cabal.py
diff --git a/extras/cfg_altoptions.py b/waflib/extras/cfg_altoptions.py
index 47b1189..47b1189 100644
--- a/extras/cfg_altoptions.py
+++ b/waflib/extras/cfg_altoptions.py
diff --git a/extras/clang_compilation_database.py b/waflib/extras/clang_compilation_database.py
index 4d9b5e2..4d9b5e2 100644
--- a/extras/clang_compilation_database.py
+++ b/waflib/extras/clang_compilation_database.py
diff --git a/extras/codelite.py b/waflib/extras/codelite.py
index 523302c..523302c 100644
--- a/extras/codelite.py
+++ b/waflib/extras/codelite.py
diff --git a/extras/color_gcc.py b/waflib/extras/color_gcc.py
index b68c5eb..b68c5eb 100644
--- a/extras/color_gcc.py
+++ b/waflib/extras/color_gcc.py
diff --git a/extras/color_rvct.py b/waflib/extras/color_rvct.py
index f89ccbd..f89ccbd 100644
--- a/extras/color_rvct.py
+++ b/waflib/extras/color_rvct.py
diff --git a/extras/compat15.py b/waflib/extras/compat15.py
index 0e74df8..0e74df8 100644
--- a/extras/compat15.py
+++ b/waflib/extras/compat15.py
diff --git a/extras/cppcheck.py b/waflib/extras/cppcheck.py
index 13ff424..13ff424 100644
--- a/extras/cppcheck.py
+++ b/waflib/extras/cppcheck.py
diff --git a/extras/cpplint.py b/waflib/extras/cpplint.py
index 8cdd6dd..8cdd6dd 100644
--- a/extras/cpplint.py
+++ b/waflib/extras/cpplint.py
diff --git a/extras/cross_gnu.py b/waflib/extras/cross_gnu.py
index 309f53b..309f53b 100644
--- a/extras/cross_gnu.py
+++ b/waflib/extras/cross_gnu.py
diff --git a/extras/cython.py b/waflib/extras/cython.py
index 591c274..591c274 100644
--- a/extras/cython.py
+++ b/waflib/extras/cython.py
diff --git a/extras/dcc.py b/waflib/extras/dcc.py
index c1a57c0..c1a57c0 100644
--- a/extras/dcc.py
+++ b/waflib/extras/dcc.py
diff --git a/extras/distnet.py b/waflib/extras/distnet.py
index ff3ed8e..ff3ed8e 100644
--- a/extras/distnet.py
+++ b/waflib/extras/distnet.py
diff --git a/extras/doxygen.py b/waflib/extras/doxygen.py
index 28f56e9..28f56e9 100644
--- a/extras/doxygen.py
+++ b/waflib/extras/doxygen.py
diff --git a/extras/dpapi.py b/waflib/extras/dpapi.py
index b94d482..b94d482 100644
--- a/extras/dpapi.py
+++ b/waflib/extras/dpapi.py
diff --git a/extras/eclipse.py b/waflib/extras/eclipse.py
index bb78741..bb78741 100644
--- a/extras/eclipse.py
+++ b/waflib/extras/eclipse.py
diff --git a/extras/erlang.py b/waflib/extras/erlang.py
index 0b93d9a..0b93d9a 100644
--- a/extras/erlang.py
+++ b/waflib/extras/erlang.py
diff --git a/extras/fast_partial.py b/waflib/extras/fast_partial.py
index d5b6144..d5b6144 100644
--- a/extras/fast_partial.py
+++ b/waflib/extras/fast_partial.py
diff --git a/extras/fc_bgxlf.py b/waflib/extras/fc_bgxlf.py
index cca1810..cca1810 100644
--- a/extras/fc_bgxlf.py
+++ b/waflib/extras/fc_bgxlf.py
diff --git a/extras/fc_cray.py b/waflib/extras/fc_cray.py
index da733fa..da733fa 100644
--- a/extras/fc_cray.py
+++ b/waflib/extras/fc_cray.py
diff --git a/extras/fc_nag.py b/waflib/extras/fc_nag.py
index edcb218..edcb218 100644
--- a/extras/fc_nag.py
+++ b/waflib/extras/fc_nag.py
diff --git a/extras/fc_nec.py b/waflib/extras/fc_nec.py
index 67c8680..67c8680 100644
--- a/extras/fc_nec.py
+++ b/waflib/extras/fc_nec.py
diff --git a/extras/fc_nfort.py b/waflib/extras/fc_nfort.py
index c25886b..c25886b 100644
--- a/extras/fc_nfort.py
+++ b/waflib/extras/fc_nfort.py
diff --git a/extras/fc_open64.py b/waflib/extras/fc_open64.py
index 413719f..413719f 100644
--- a/extras/fc_open64.py
+++ b/waflib/extras/fc_open64.py
diff --git a/extras/fc_pgfortran.py b/waflib/extras/fc_pgfortran.py
index afb2817..afb2817 100644
--- a/extras/fc_pgfortran.py
+++ b/waflib/extras/fc_pgfortran.py
diff --git a/extras/fc_solstudio.py b/waflib/extras/fc_solstudio.py
index 53766df..53766df 100644
--- a/extras/fc_solstudio.py
+++ b/waflib/extras/fc_solstudio.py
diff --git a/extras/fc_xlf.py b/waflib/extras/fc_xlf.py
index 5a3da03..5a3da03 100644
--- a/extras/fc_xlf.py
+++ b/waflib/extras/fc_xlf.py
diff --git a/extras/file_to_object.py b/waflib/extras/file_to_object.py
index 1393b51..1393b51 100644
--- a/extras/file_to_object.py
+++ b/waflib/extras/file_to_object.py
diff --git a/extras/fluid.py b/waflib/extras/fluid.py
index 4814a35..4814a35 100644
--- a/extras/fluid.py
+++ b/waflib/extras/fluid.py
diff --git a/extras/freeimage.py b/waflib/extras/freeimage.py
index f27e525..f27e525 100644
--- a/extras/freeimage.py
+++ b/waflib/extras/freeimage.py
diff --git a/extras/fsb.py b/waflib/extras/fsb.py
index 1b8f398..1b8f398 100644
--- a/extras/fsb.py
+++ b/waflib/extras/fsb.py
diff --git a/extras/fsc.py b/waflib/extras/fsc.py
index c67e70b..c67e70b 100644
--- a/extras/fsc.py
+++ b/waflib/extras/fsc.py
diff --git a/extras/gccdeps.py b/waflib/extras/gccdeps.py
index bfabe72..bfabe72 100644
--- a/extras/gccdeps.py
+++ b/waflib/extras/gccdeps.py
diff --git a/extras/gdbus.py b/waflib/extras/gdbus.py
index 0e0476e..0e0476e 100644
--- a/extras/gdbus.py
+++ b/waflib/extras/gdbus.py
diff --git a/extras/gob2.py b/waflib/extras/gob2.py
index b4fa3b9..b4fa3b9 100644
--- a/extras/gob2.py
+++ b/waflib/extras/gob2.py
diff --git a/extras/halide.py b/waflib/extras/halide.py
index 6078e38..6078e38 100644
--- a/extras/halide.py
+++ b/waflib/extras/halide.py
diff --git a/extras/javatest.py b/waflib/extras/javatest.py
index 979b8d8..979b8d8 100755
--- a/extras/javatest.py
+++ b/waflib/extras/javatest.py
diff --git a/extras/kde4.py b/waflib/extras/kde4.py
index aed9bfb..aed9bfb 100644
--- a/extras/kde4.py
+++ b/waflib/extras/kde4.py
diff --git a/extras/local_rpath.py b/waflib/extras/local_rpath.py
index b2507e1..b2507e1 100644
--- a/extras/local_rpath.py
+++ b/waflib/extras/local_rpath.py
diff --git a/extras/lv2.py b/waflib/extras/lv2.py
index ffcb2e7..ffcb2e7 100644
--- a/extras/lv2.py
+++ b/waflib/extras/lv2.py
diff --git a/extras/make.py b/waflib/extras/make.py
index 933d9ca..933d9ca 100644
--- a/extras/make.py
+++ b/waflib/extras/make.py
diff --git a/extras/midl.py b/waflib/extras/midl.py
index 43e6cf9..43e6cf9 100644
--- a/extras/midl.py
+++ b/waflib/extras/midl.py
diff --git a/extras/msvcdeps.py b/waflib/extras/msvcdeps.py
index fc1ecd4..fc1ecd4 100644
--- a/extras/msvcdeps.py
+++ b/waflib/extras/msvcdeps.py
diff --git a/extras/msvs.py b/waflib/extras/msvs.py
index 8aa2db0..8aa2db0 100644
--- a/extras/msvs.py
+++ b/waflib/extras/msvs.py
diff --git a/extras/netcache_client.py b/waflib/extras/netcache_client.py
index dc49048..dc49048 100644
--- a/extras/netcache_client.py
+++ b/waflib/extras/netcache_client.py
diff --git a/extras/objcopy.py b/waflib/extras/objcopy.py
index 82d8359..82d8359 100644
--- a/extras/objcopy.py
+++ b/waflib/extras/objcopy.py
diff --git a/extras/ocaml.py b/waflib/extras/ocaml.py
index 7d785c6..7d785c6 100644
--- a/extras/ocaml.py
+++ b/waflib/extras/ocaml.py
diff --git a/extras/package.py b/waflib/extras/package.py
index c06498e..c06498e 100644
--- a/extras/package.py
+++ b/waflib/extras/package.py
diff --git a/extras/parallel_debug.py b/waflib/extras/parallel_debug.py
index 4ffec5e..4ffec5e 100644
--- a/extras/parallel_debug.py
+++ b/waflib/extras/parallel_debug.py
diff --git a/extras/pch.py b/waflib/extras/pch.py
index 103e752..103e752 100644
--- a/extras/pch.py
+++ b/waflib/extras/pch.py
diff --git a/extras/pep8.py b/waflib/extras/pep8.py
index 676beed..676beed 100644
--- a/extras/pep8.py
+++ b/waflib/extras/pep8.py
diff --git a/extras/pgicc.py b/waflib/extras/pgicc.py
index f8068d5..f8068d5 100644
--- a/extras/pgicc.py
+++ b/waflib/extras/pgicc.py
diff --git a/extras/pgicxx.py b/waflib/extras/pgicxx.py
index eae121c..eae121c 100644
--- a/extras/pgicxx.py
+++ b/waflib/extras/pgicxx.py
diff --git a/extras/proc.py b/waflib/extras/proc.py
index 764abec..764abec 100644
--- a/extras/proc.py
+++ b/waflib/extras/proc.py
diff --git a/extras/protoc.py b/waflib/extras/protoc.py
index 839c510..839c510 100644
--- a/extras/protoc.py
+++ b/waflib/extras/protoc.py
diff --git a/extras/pyqt5.py b/waflib/extras/pyqt5.py
index 80f43b8..80f43b8 100644
--- a/extras/pyqt5.py
+++ b/waflib/extras/pyqt5.py
diff --git a/extras/pytest.py b/waflib/extras/pytest.py
index 7dd5a1a..7dd5a1a 100644
--- a/extras/pytest.py
+++ b/waflib/extras/pytest.py
diff --git a/extras/qnxnto.py b/waflib/extras/qnxnto.py
index 1158124..1158124 100644
--- a/extras/qnxnto.py
+++ b/waflib/extras/qnxnto.py
diff --git a/extras/qt4.py b/waflib/extras/qt4.py
index d19a4dd..d19a4dd 100644
--- a/extras/qt4.py
+++ b/waflib/extras/qt4.py
diff --git a/extras/relocation.py b/waflib/extras/relocation.py
index 7e821f4..7e821f4 100644
--- a/extras/relocation.py
+++ b/waflib/extras/relocation.py
diff --git a/extras/remote.py b/waflib/extras/remote.py
index f43b600..f43b600 100644
--- a/extras/remote.py
+++ b/waflib/extras/remote.py
diff --git a/extras/resx.py b/waflib/extras/resx.py
index caf4d31..caf4d31 100644
--- a/extras/resx.py
+++ b/waflib/extras/resx.py
diff --git a/extras/review.py b/waflib/extras/review.py
index 561e062..561e062 100644
--- a/extras/review.py
+++ b/waflib/extras/review.py
diff --git a/extras/rst.py b/waflib/extras/rst.py
index f3c3a5e..f3c3a5e 100644
--- a/extras/rst.py
+++ b/waflib/extras/rst.py
diff --git a/extras/run_do_script.py b/waflib/extras/run_do_script.py
index 07e3aa2..07e3aa2 100644
--- a/extras/run_do_script.py
+++ b/waflib/extras/run_do_script.py
diff --git a/extras/run_m_script.py b/waflib/extras/run_m_script.py
index b5f27eb..b5f27eb 100644
--- a/extras/run_m_script.py
+++ b/waflib/extras/run_m_script.py
diff --git a/extras/run_py_script.py b/waflib/extras/run_py_script.py
index 3670381..3670381 100644
--- a/extras/run_py_script.py
+++ b/waflib/extras/run_py_script.py
diff --git a/extras/run_r_script.py b/waflib/extras/run_r_script.py
index b0d8f2b..b0d8f2b 100644
--- a/extras/run_r_script.py
+++ b/waflib/extras/run_r_script.py
diff --git a/extras/sas.py b/waflib/extras/sas.py
index 754c614..754c614 100644
--- a/extras/sas.py
+++ b/waflib/extras/sas.py
diff --git a/extras/satellite_assembly.py b/waflib/extras/satellite_assembly.py
index 005eb07..005eb07 100644
--- a/extras/satellite_assembly.py
+++ b/waflib/extras/satellite_assembly.py
diff --git a/extras/scala.py b/waflib/extras/scala.py
index a9880f0..a9880f0 100644
--- a/extras/scala.py
+++ b/waflib/extras/scala.py
diff --git a/extras/slow_qt4.py b/waflib/extras/slow_qt4.py
index ec7880b..ec7880b 100644
--- a/extras/slow_qt4.py
+++ b/waflib/extras/slow_qt4.py
diff --git a/extras/softlink_libs.py b/waflib/extras/softlink_libs.py
index 50c777f..50c777f 100644
--- a/extras/softlink_libs.py
+++ b/waflib/extras/softlink_libs.py
diff --git a/extras/stale.py b/waflib/extras/stale.py
index cac3f46..cac3f46 100644
--- a/extras/stale.py
+++ b/waflib/extras/stale.py
diff --git a/extras/stracedeps.py b/waflib/extras/stracedeps.py
index 37d82cb..37d82cb 100644
--- a/extras/stracedeps.py
+++ b/waflib/extras/stracedeps.py
diff --git a/extras/swig.py b/waflib/extras/swig.py
index 740ab46..740ab46 100644
--- a/extras/swig.py
+++ b/waflib/extras/swig.py
diff --git a/extras/syms.py b/waflib/extras/syms.py
index dfa0059..dfa0059 100644
--- a/extras/syms.py
+++ b/waflib/extras/syms.py
diff --git a/extras/ticgt.py b/waflib/extras/ticgt.py
index f43a7ea..f43a7ea 100644
--- a/extras/ticgt.py
+++ b/waflib/extras/ticgt.py
diff --git a/extras/unity.py b/waflib/extras/unity.py
index 78128ed..78128ed 100644
--- a/extras/unity.py
+++ b/waflib/extras/unity.py
diff --git a/extras/use_config.py b/waflib/extras/use_config.py
index ef5129f..ef5129f 100644
--- a/extras/use_config.py
+++ b/waflib/extras/use_config.py
diff --git a/extras/valadoc.py b/waflib/extras/valadoc.py
index c50f69e..c50f69e 100644
--- a/extras/valadoc.py
+++ b/waflib/extras/valadoc.py
diff --git a/extras/waf_xattr.py b/waflib/extras/waf_xattr.py
index 351dd63..351dd63 100644
--- a/extras/waf_xattr.py
+++ b/waflib/extras/waf_xattr.py
diff --git a/extras/why.py b/waflib/extras/why.py
index 1bb941f..1bb941f 100644
--- a/extras/why.py
+++ b/waflib/extras/why.py
diff --git a/extras/win32_opts.py b/waflib/extras/win32_opts.py
index 9f7443c..9f7443c 100644
--- a/extras/win32_opts.py
+++ b/waflib/extras/win32_opts.py
diff --git a/extras/wix.py b/waflib/extras/wix.py
index d87bfbb..d87bfbb 100644
--- a/extras/wix.py
+++ b/waflib/extras/wix.py
diff --git a/extras/xcode6.py b/waflib/extras/xcode6.py
index 91bbff1..91bbff1 100644
--- a/extras/xcode6.py
+++ b/waflib/extras/xcode6.py
diff --git a/fixpy2.py b/waflib/fixpy2.py
index 24176e0..24176e0 100644
--- a/fixpy2.py
+++ b/waflib/fixpy2.py
diff --git a/processor.py b/waflib/processor.py
index 2eecf3b..2eecf3b 100755
--- a/processor.py
+++ b/waflib/processor.py
diff --git a/waflib/waf b/waflib/waf
new file mode 100755
index 0000000..e22930a
--- /dev/null
+++ b/waflib/waf
@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+
+# Minimal waf script for projects that include waflib directly
+
+from waflib import Context, Scripting
+
+import inspect
+import os
+
+def main():
+    script_path = os.path.abspath(inspect.getfile(inspect.getmodule(main)))
+    project_path = os.path.dirname(script_path)
+    Scripting.waf_entry_point(os.getcwd(), Context.WAFVERSION, project_path)
+
+if __name__ == '__main__':
+    main()
diff --git a/wscript b/wscript
new file mode 100644
index 0000000..8f9602c
--- /dev/null
+++ b/wscript
@@ -0,0 +1,242 @@
+#!/usr/bin/env python
+
+import os
+
+from waflib import Options, Utils
+from waflib.extras import autowaf
+
+# Library and package version (UNIX style major, minor, micro)
+# major increment <=> incompatible changes
+# minor increment <=> compatible changes (additions)
+# micro increment <=> no interface changes
+GANV_VERSION       = '1.5.4'
+GANV_MAJOR_VERSION = '1'
+
+# Mandatory waf variables
+APPNAME = 'ganv'        # Package name for waf dist
+VERSION = GANV_VERSION  # Package version for waf dist
+top     = '.'           # Source directory
+out     = 'build'       # Build directory
+
+def options(ctx):
+    ctx.load('compiler_c')
+    ctx.load('compiler_cxx')
+    ctx.add_flags(
+        ctx.configuration_options(),
+        {'no-graphviz': 'do not compile with graphviz support',
+         'light-theme': 'use light coloured theme',
+         'no-fdgl': 'use experimental force-directed graph layout',
+         'no-nls': 'disable i18n (native language support)',
+         'gir': 'build GObject introspection data'})
+
+def configure(conf):
+    conf.load('compiler_c', cache=True)
+    conf.load('compiler_cxx', cache=True)
+    conf.load('autowaf', cache=True)
+    autowaf.set_c_lang(conf, 'c99')
+
+    autowaf.check_pkg(conf, 'gtk+-2.0', uselib_store='GTK',
+                      atleast_version='2.0.0', system=True, mandatory=True)
+    autowaf.check_pkg(conf, 'gtkmm-2.4', uselib_store='GTKMM',
+                      atleast_version='2.10.0', system=True, mandatory=True)
+
+    if Options.options.gir:
+        autowaf.check_pkg(conf, 'gobject-introspection-1.0',
+                          uselib_store='GIR', mandatory=False)
+        conf.find_program('g-ir-doc-tool', var='G_IR_DOC_TOOL', mandatory=False)
+        conf.find_program('yelp-build', var='YELP_BUILD', mandatory=False)
+
+    if not Options.options.no_graphviz:
+        autowaf.check_pkg(conf, 'libgvc', uselib_store='AGRAPH',
+                          atleast_version='2.30', system=True, mandatory=False)
+
+    if not Options.options.no_fdgl:
+        autowaf.define(conf, 'GANV_FDGL', 1)
+
+    if Options.options.light_theme:
+        autowaf.define(conf, 'GANV_USE_LIGHT_THEME', 1)
+
+    if not Options.options.no_nls:
+        autowaf.check_function(conf, 'cxx',  'dgettext',
+                               header_name = 'libintl.h',
+                               lib         = 'intl',
+                               define_name = 'ENABLE_NLS',
+                               mandatory   = False)
+
+    autowaf.set_lib_env(conf, 'ganv', GANV_VERSION)
+    conf.write_config_header('ganv_config.h', remove=False)
+
+    autowaf.display_summary(
+        conf,
+        {'Static (Graphviz) arrange': bool(conf.env.HAVE_AGRAPH_2_20),
+         'Interactive force-directed arrange': bool(conf.env.GANV_FDGL),
+         'Native language support': bool(conf.env.ENABLE_NLS),
+         'GObject introspection': bool(conf.env.HAVE_GIR),
+         'Unit tests': bool(conf.env.BUILD_TESTS)})
+
+ganv_source = [
+    'src/Canvas.cpp',
+    'src/Port.cpp',
+    'src/box.c',
+    'src/circle.c',
+    'src/edge.c',
+    'src/ganv-marshal.c',
+    'src/group.c',
+    'src/item.c',
+    'src/module.c',
+    'src/node.c',
+    'src/port.c',
+    'src/text.c',
+    'src/widget.c'
+]
+
+def declare_doc_files(task):
+    bld  = task.generator.bld
+    path = bld.path.get_bld().find_or_declare('doc-html')
+    for i in path.ant_glob('*', remove=False):
+        i.sig = Utils.h_file(i.abspath())
+
+def build(bld):
+    # Headers
+    includedir = '${INCLUDEDIR}/ganv-%s/ganv' % GANV_MAJOR_VERSION
+    bld.install_files(includedir, bld.path.ant_glob('ganv/*.h*'))
+
+    # Pkgconfig file
+    autowaf.build_pc(bld, 'GANV', GANV_VERSION, GANV_MAJOR_VERSION,
+                     'GTKMM AGRAPH',
+                     {'GANV_MAJOR_VERSION' : GANV_MAJOR_VERSION})
+
+    bld(rule = 'glib-genmarshal --prefix=ganv_marshal --header ${SRC} > ${TGT}',
+        source = 'src/ganv-marshal.list',
+        target = 'src/ganv-marshal.h')
+
+    bld(rule = 'glib-genmarshal --prefix=ganv_marshal --body ${SRC} > ${TGT}',
+        source = 'src/ganv-marshal.list',
+        target = 'src/ganv-marshal.c.in')
+
+    bld(rule = 'cat ${SRC} > ${TGT}',
+        source = ['src/ganv-marshal.h', 'src/ganv-marshal.c.in'],
+        target = 'src/ganv-marshal.c')
+
+    # Library
+    lib = bld(features        = 'c cshlib cxx cxxshlib',
+              export_includes = ['.'],
+              source          = ganv_source,
+              includes        = ['.', './src'],
+              name            = 'libganv',
+              target          = 'ganv-%s' % GANV_MAJOR_VERSION,
+              uselib          = 'GTKMM AGRAPH',
+              vnum            = GANV_VERSION,
+              install_path    = '${LIBDIR}')
+    if bld.is_defined('ENABLE_NLS'):
+        lib.lib = ['intl']
+
+    # Benchmark program (C++)
+    bld(features     = 'cxx cxxprogram',
+        source       = 'src/ganv_bench.cpp',
+        includes     = ['.', './src'],
+        use          = 'libganv',
+        uselib       = 'GTKMM AGRAPH',
+        target       = 'src/ganv_bench')
+
+    if bld.env.BUILD_TESTS:
+        test_libs   = []
+        test_cflags = ['']
+        test_linkflags  = ['']
+        if not bld.env.NO_COVERAGE:
+            test_cflags    += ['--coverage']
+            test_linkflags += ['--coverage']
+
+        # Static library for test program
+        bld(features     = 'c cstlib cxx cxxshlib',
+            source       = ganv_source,
+            includes     = ['.', './src'],
+            name         = 'libganv_profiled',
+            target       = 'ganv_profiled',
+            uselib       = 'GTKMM AGRAPH',
+            install_path = '',
+            cflags       = test_cflags,
+            linkflags    = test_linkflags)
+
+        # Test program (C)
+        bld(features     = 'cxx cxxprogram',
+            source       = 'src/ganv_test.c',
+            includes     = ['.', './src'],
+            use          = 'libganv_profiled',
+            lib          = test_libs,
+            uselib       = 'GTKMM AGRAPH',
+            target       = 'src/ganv_test',
+            cflags       = test_cflags,
+            linkflags    = test_linkflags)
+
+    # Documentation
+    #autowaf.build_dox(bld, 'GANV', GANV_VERSION, top, out)
+
+    if bld.env.HAVE_GIR:
+        bld.add_group()
+
+        bld_dir = os.path.join(out, APPNAME)
+        if not (len(bld.stack_path) > 1):  # not top-level
+            bld_dir = out
+
+        pc_path = os.path.abspath(os.path.join(bld_dir, 'ganv-1.pc'))
+
+        bld(name         = 'ganv-gir',
+            source       = ganv_source + bld.path.ant_glob('ganv/*.h'),
+            target       = 'Ganv-1.0.gir',
+            install_path = '${LIBDIR}/girepository-1.0',
+            rule         = 'g-ir-scanner --warn-all -n Ganv --nsversion=1.0'
+            ' --no-libtool ' +
+            ('--pkg=%s' % pc_path) +
+            (' -I%s' % bld.path.bldpath()) +
+            ''.join([' -I' + path for path in bld.env.INCLUDES_GTK]) +
+            (' -L%s' % bld_dir) +
+            ' --library=ganv-1'
+            ' --include=GObject-2.0 --include=Gdk-2.0 --include Gtk-2.0'
+            ' -o ${TGT} ${SRC}')
+
+        bld(name         = 'ganv-typelib',
+            after        = 'ganv-gir',
+            source       = 'Ganv-1.0.gir',
+            target       = 'Ganv-1.0.typelib',
+            install_path = '${LIBDIR}/girepository-1.0',
+            rule         = 'g-ir-compiler ${SRC} -o ${TGT}')
+
+        if bld.env.DOCS and bld.env['G_IR_DOC_TOOL'] and bld.env['YELP_BUILD']:
+            # The source and target files used here aren't exclusive,
+            # but are declared so waf can track dependencies
+            bld(rule   = '${G_IR_DOC_TOOL} --language C -o doc-xml ${SRC}',
+                source = 'Ganv-1.0.gir',
+                target = 'doc-xml/index.page')
+            bld(name   = 'yelp-build',
+                rule   = '${YELP_BUILD} html -o doc-html doc-xml',
+                source = 'doc-xml/index.page',
+                target = 'doc-html/index.html')
+            bld(name   = 'find-docs',
+                always = True,
+                rule   = declare_doc_files,
+                after  = 'yelp-build')
+
+            bld.install_files(
+                os.path.join('${DOCDIR}', 'ganv-0', 'html'),
+                bld.path.get_bld().ant_glob('doc-html/*'))
+
+    bld.add_post_fun(autowaf.run_ldconfig)
+
+def test(tst):
+    tst.run(['./src/ganv_test'])
+
+def i18n(bld):
+    autowaf.build_i18n(bld, '..', 'ganv', APPNAME, ganv_source,
+                       'David Robillard')
+
+def posts(ctx):
+    path = str(ctx.path.abspath())
+    autowaf.news_to_posts(
+        os.path.join(path, 'NEWS'),
+        {'title'        : 'Ganv',
+         'description'  : autowaf.get_blurb(os.path.join(path, 'README')),
+         'dist_pattern' : 'http://download.drobilla.net/ganv-%s.tar.bz2'},
+        { 'Author' : 'drobilla',
+          'Tags'   : 'Hacking, LAD, LV2, Ganv' },
+        os.path.join(out, 'posts'))