From 1b005502bb4f3a271c514e46ce66d3b24b2a5f38 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Mon, 26 Oct 2015 17:36:03 +0000
Subject: Add support for edges that do not constrain the layout

git-svn-id: http://svn.drobilla.net/lad/trunk/ganv@5792 a436a847-0d15-0410-975c-d299462d15a1
---
 src/Canvas.cpp     | 11 +++++++++--
 src/edge.c         | 25 +++++++++++++++++++++++++
 src/ganv-private.h |  1 +
 3 files changed, 35 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/Canvas.cpp b/src/Canvas.cpp
index 3c59351..7d79ffe 100644
--- a/src/Canvas.cpp
+++ b/src/Canvas.cpp
@@ -745,6 +745,9 @@ GanvCanvasImpl::layout_dot(const std::string& filename)
 				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", "false", (char*)"");
+			}
 		} else {
 			std::cerr << "Unable to find graphviz node" << std::endl;
 		}
@@ -861,8 +864,12 @@ GanvCanvasImpl::layout_calculate(double dur, bool update)
 	// Calculate attractive spring forces for edges
 	FOREACH_EDGE(_edges, i) {
 		const GanvEdge* const edge = *i;
-		GanvNode*             tail = ganv_edge_get_tail(edge);
-		GanvNode*             head = ganv_edge_get_head(edge);
+		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)));
 		}
diff --git a/src/edge.c b/src/edge.c
index d3c96cc..eab950c 100644
--- a/src/edge.c
+++ b/src/edge.c
@@ -47,6 +47,7 @@ enum {
 	PROP_DASH_LENGTH,
 	PROP_DASH_OFFSET,
 	PROP_COLOR,
+	PROP_CONSTRAINING,
 	PROP_CURVED,
 	PROP_ARROWHEAD,
 	PROP_SELECTED,
@@ -72,6 +73,7 @@ ganv_edge_init(GanvEdge* edge)
 	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;
 
@@ -120,6 +122,7 @@ ganv_edge_set_property(GObject*      object,
 		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);
@@ -151,6 +154,7 @@ ganv_edge_get_property(GObject*    object,
 		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);
@@ -563,6 +567,14 @@ ganv_edge_class_init(GanvEdgeClass* klass)
 			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",
@@ -652,6 +664,19 @@ 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)
 {
diff --git a/src/ganv-private.h b/src/ganv-private.h
index 93f286c..2cbe963 100644
--- a/src/ganv-private.h
+++ b/src/ganv-private.h
@@ -68,6 +68,7 @@ typedef struct {
 	double   cx1, cy1, cx2, cy2;
 	double   handle_x, handle_y, handle_radius;
 	double   width;
+	gboolean constraining;
 	gboolean curved;
 	gboolean arrowhead;
 } GanvEdgeCoords;
-- 
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