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#include <gtk/gtk.h>
#include <glib.h>
#include <cairo.h>
#define NO_MAIN
#include "region-iter.c"
static const pixman_rectangle32_t rects[] = {
{ 0, 50, 200, 100 },
{ 250, 0, 200, 100 },
{ 500, 0, 50, 350 },
{ 400, 100, 50, 100 },
{ 100, 150, 50, 50 },
{ 50, 200, 150, 150 },
{ 0, 300, 50, 50 },
{ 200, 250, 100, 100 },
{ 250, 150, 100, 100 },
{ 350, 200, 100, 150 },
{ 250, 350, 150, 50 },
{ 450, 350, 50, 50 },
{ 50, 450, 400, 50 },
{ 25, 135, 600, 25 },
{ 25, 355, 600, 25 },
{ 125, 305, 300, 25 }
};
#define N_RECTS (sizeof (rects) / sizeof (rects[0]))
static corner_t *
make_path (int *n_corners)
{
corner_t *corners;
pixman_region32_t region;
int i;
pixman_box32_t *boxes = malloc (N_RECTS * sizeof (pixman_box32_t));
for (i = 0; i < N_RECTS; ++i)
{
boxes[i].x1 = rects[i].x;
boxes[i].y1 = rects[i].y;
boxes[i].x2 = rects[i].x + rects[i].width;
boxes[i].y2 = rects[i].y + rects[i].height;
}
region_from_boxes (®ion, boxes, N_RECTS);
pixman_region32_init (®ion);
for (i = 0; i < N_RECTS; ++i)
{
pixman_region32_union_rect (®ion, ®ion,
50 + rects[i].x, 50 + rects[i].y,
rects[i].width, rects[i].height);
}
corners = region_path (®ion, n_corners);
pixman_region32_fini (®ion);
return corners;
}
static gboolean
on_expose (GtkWidget *widget, GdkEvent *event, gpointer data)
{
cairo_t *cr;
int i;
if (GTK_WIDGET_DRAWABLE (widget))
{
corner_t *corners;
int n_corners;
cr = gdk_cairo_create (widget->window);
for (i = 0; i < N_RECTS; ++i)
{
cairo_rectangle (cr,
50 + rects[i].x, 50 + rects[i].y,
rects[i].width, rects[i].height);
cairo_set_source_rgba (
cr, g_random_double(), g_random_double(), g_random_double(), 0.4);
cairo_fill (cr);
}
corners = make_path (&n_corners);
for (i = 0; i < n_corners; ++i)
{
corner_t *corner = &(corners[i]);
cairo_move_to (cr, corner->x, corner->y);
while (corner->next != -1)
{
corner_t *next = &(corners[corner->next]);
cairo_line_to (cr, next->x, next->y);
corner->next = -1;
corner = next;
}
}
cairo_set_source_rgba (cr, 0.2, g_random_double(), 0.2, 0);
cairo_fill_preserve (cr);
cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 1.0);
cairo_stroke (cr);
free (corners);
cairo_destroy (cr);
}
return TRUE;
}
static void
on_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
gtk_widget_queue_draw (widget);
}
int
main (int argc, char **argv)
{
GtkWidget *window;
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size (GTK_WINDOW (window), 1200, 768);
g_signal_connect (window, "size_allocate", G_CALLBACK (on_allocate), NULL);
g_signal_connect (window, "expose_event", G_CALLBACK (on_expose), NULL);
gtk_widget_show_all (GTK_WIDGET (window));
gtk_main ();
return 0;
}
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