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+/*
+ Copyright 2012-2019 David Robillard <http://drobilla.net>
+
+ Permission to use, copy, modify, and/or distribute this software for any
+ purpose with or without fee is hereby granted, provided that the above
+ copyright notice and this permission notice appear in all copies.
+
+ THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/**
+ @file pugl_cairo_demo.c An example of drawing with Cairo.
+*/
+
+#include "demo_utils.h"
+#include "test/test_utils.h"
+
+#include "pugl/pugl.h"
+#include "pugl/pugl_cairo.h"
+
+#include <cairo.h>
+
+#include <math.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+static PuglWorld* world = NULL;
+static PuglTestOptions opts = {0};
+
+static int quit = 0;
+static bool entered = false;
+static bool mouseDown = false;
+static unsigned framesDrawn = 0;
+
+typedef struct {
+ int x;
+ int y;
+ int w;
+ int h;
+ const char* label;
+} Button;
+
+static Button buttons[] = { { 128, 128, 64, 64, "1" },
+ { 384, 128, 64, 64, "2" },
+ { 128, 384, 64, 64, "3" },
+ { 384, 384, 64, 64, "4" },
+ { 0, 0, 0, 0, NULL } };
+
+static void
+roundedBox(cairo_t* cr, double x, double y, double w, double h)
+{
+ static const double radius = 10;
+ static const double degrees = 3.14159265 / 180.0;
+
+ cairo_new_sub_path(cr);
+ cairo_arc(cr,
+ x + w - radius,
+ y + radius,
+ radius, -90 * degrees, 0 * degrees);
+ cairo_arc(cr,
+ x + w - radius, y + h - radius,
+ radius, 0 * degrees, 90 * degrees);
+ cairo_arc(cr,
+ x + radius, y + h - radius,
+ radius, 90 * degrees, 180 * degrees);
+ cairo_arc(cr,
+ x + radius, y + radius,
+ radius, 180 * degrees, 270 * degrees);
+ cairo_close_path(cr);
+}
+
+static void
+buttonDraw(cairo_t* cr, const Button* but, const double time)
+{
+ cairo_save(cr);
+ cairo_translate(cr, but->x, but->y);
+ cairo_rotate(cr, sin(time) * 3.141592);
+
+ // Draw base
+ if (mouseDown) {
+ cairo_set_source_rgba(cr, 0.4, 0.9, 0.1, 1);
+ } else {
+ cairo_set_source_rgba(cr, 0.3, 0.5, 0.1, 1);
+ }
+ roundedBox(cr, 0, 0, but->w, but->h);
+ cairo_fill_preserve(cr);
+
+ // Draw border
+ cairo_set_source_rgba(cr, 0.4, 0.9, 0.1, 1);
+ cairo_set_line_width(cr, 4.0);
+ cairo_stroke(cr);
+
+ // Draw label
+ cairo_text_extents_t extents;
+ cairo_set_font_size(cr, 32.0);
+ cairo_text_extents(cr, but->label, &extents);
+ cairo_move_to(cr,
+ (but->w / 2.0) - extents.width / 2,
+ (but->h / 2.0) + extents.height / 2);
+ cairo_set_source_rgba(cr, 0, 0, 0, 1);
+ cairo_show_text(cr, but->label);
+
+ cairo_restore(cr);
+}
+
+static void
+postButtonRedisplay(PuglView* view)
+{
+ const PuglRect frame = puglGetFrame(view);
+ const double width = frame.width;
+ const double height = frame.height;
+ const double scaleX = (width - (512 / width)) / 512.0;
+ const double scaleY = (height - (512 / height)) / 512.0;
+
+ for (Button* b = buttons; b->label; ++b) {
+ const double span = sqrt(b->w * b->w + b->h * b->h);
+ const PuglRect rect = {(b->x - span) * scaleX,
+ (b->y - span) * scaleY,
+ span * 2.0 * scaleX,
+ span * 2.0 * scaleY};
+
+ puglPostRedisplayRect(view, rect);
+ }
+}
+
+static void
+onDisplay(PuglView* view, const PuglEventExpose* event)
+{
+ cairo_t* cr = (cairo_t*)puglGetContext(view);
+
+ cairo_rectangle(cr, event->x, event->y, event->width, event->height);
+ cairo_clip_preserve(cr);
+
+ // Draw background
+ const PuglRect frame = puglGetFrame(view);
+ const double width = frame.width;
+ const double height = frame.height;
+ if (entered) {
+ cairo_set_source_rgb(cr, 0.1, 0.1, 0.1);
+ } else {
+ cairo_set_source_rgb(cr, 0, 0, 0);
+ }
+ cairo_fill(cr);
+
+ // Scale to view size
+ const double scaleX = (width - (512 / width)) / 512.0;
+ const double scaleY = (height - (512 / height)) / 512.0;
+ cairo_scale(cr, scaleX, scaleY);
+
+ // Draw button
+ for (Button* b = buttons; b->label; ++b) {
+ buttonDraw(cr, b, opts.continuous ? puglGetTime(world) : 0.0);
+ }
+
+ ++framesDrawn;
+}
+
+static void
+onClose(PuglView* view)
+{
+ (void)view;
+ quit = 1;
+}
+
+static PuglStatus
+onEvent(PuglView* view, const PuglEvent* event)
+{
+ switch (event->type) {
+ case PUGL_KEY_PRESS:
+ if (event->key.key == 'q' || event->key.key == PUGL_KEY_ESCAPE) {
+ quit = 1;
+ }
+ break;
+ case PUGL_BUTTON_PRESS:
+ mouseDown = true;
+ postButtonRedisplay(view);
+ break;
+ case PUGL_BUTTON_RELEASE:
+ mouseDown = false;
+ postButtonRedisplay(view);
+ break;
+ case PUGL_ENTER_NOTIFY:
+ entered = true;
+ puglPostRedisplay(view);
+ break;
+ case PUGL_LEAVE_NOTIFY:
+ entered = false;
+ puglPostRedisplay(view);
+ break;
+ case PUGL_EXPOSE:
+ onDisplay(view, &event->expose);
+ break;
+ case PUGL_CLOSE:
+ onClose(view);
+ break;
+ default: break;
+ }
+
+ return PUGL_SUCCESS;
+}
+
+int
+main(int argc, char** argv)
+{
+ opts = puglParseTestOptions(&argc, &argv);
+ if (opts.help) {
+ puglPrintTestUsage("pugl_test", "");
+ return 1;
+ }
+
+ world = puglNewWorld();
+ puglSetClassName(world, "PuglCairoTest");
+
+ PuglRect frame = { 0, 0, 512, 512 };
+ PuglView* view = puglNewView(world);
+ puglSetFrame(view, frame);
+ puglSetMinSize(view, 256, 256);
+ puglSetViewHint(view, PUGL_RESIZABLE, opts.resizable);
+ puglSetBackend(view, puglCairoBackend());
+
+ puglSetViewHint(view, PUGL_IGNORE_KEY_REPEAT, opts.ignoreKeyRepeat);
+ puglSetEventFunc(view, onEvent);
+
+ PuglStatus st = puglCreateWindow(view, "Pugl Test");
+ if (st) {
+ return logError("Failed to create window (%s)\n", puglStrerror(st));
+ }
+
+ puglShowWindow(view);
+
+ PuglFpsPrinter fpsPrinter = { puglGetTime(world) };
+ while (!quit) {
+ if (opts.continuous) {
+ postButtonRedisplay(view);
+ } else {
+ puglPollEvents(world, -1);
+ }
+
+ puglDispatchEvents(world);
+
+ if (opts.continuous) {
+ puglPrintFps(world, &fpsPrinter, &framesDrawn);
+ }
+ }
+
+ puglFreeView(view);
+ puglFreeWorld(world);
+ return 0;
+}
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