/* flasher.cc */
#include <gnome.h>

gint eventDelete(GtkWidget *widget, GdkEvent *event, gpointer data);
gint eventDestroy(GtkWidget *widget, GdkEvent *event, gpointer data);
gint drawRandomRectangle(gpointer data);

const int WIDTH=400, HEIGHT=300, INTERVAL = 30;

int main(int argc, char **argv)
{
  GtkWidget *app;
  GtkWidget *area;

  gnome_init("flasher", "1.0", argc, argv);
  app = gnome_app_new("flasher", "Creating Colors");
  gtk_signal_connect(GTK_OBJECT(app), "delete_event",
		     GTK_SIGNAL_FUNC(eventDelete), NULL);
  gtk_signal_connect(GTK_OBJECT(app), "destroy",
		     GTK_SIGNAL_FUNC(eventDestroy), NULL);

  area = gtk_drawing_area_new();
  gtk_widget_set_usize(area, WIDTH, HEIGHT);
  gnome_app_set_contents(GNOME_APP(app), area);
  gtk_timeout_add(INTERVAL, drawRandomRectangle, area);

  gtk_widget_show_all(app);
  gtk_main();
  exit(0);
}

gint drawRandomRectangle(gpointer data)
{
  static GdkColormap *colormap = NULL;
  static GdkGC *gc = NULL;
  GdkColor color;
  GtkWidget *widget = GTK_WIDGET(data);
  gint x = 20;
  gint y = 20;
  gint width = 40;
  gint height = 40;

  if (colormap == NULL) {
    colormap = gdk_colormap_get_system();
    gc = gdk_gc_new(widget->window);
  }

  color.red += (((double)rand()*0xFFFF)/RAND_MAX);
  color.green += (((double)rand()*0xFFFF)/RAND_MAX);
  color.blue += (((double)rand()*0xFFFF)/RAND_MAX);
  gdk_color_alloc(colormap, &color);

  gdk_gc_set_foreground(gc, &color);

  x = (((double)rand()*WIDTH)/RAND_MAX) - (WIDTH/4);
  y = (((double)rand()*HEIGHT)/RAND_MAX) - (HEIGHT/4);
  width = (((double)rand()*(WIDTH/2))/RAND_MAX);
  height = (((double)rand()*(HEIGHT/2))/RAND_MAX);

  gdk_draw_rectangle(widget->window, gc, TRUE, x, y, width, height);
  return TRUE;
}

gint eventDelete(GtkWidget *widget, GdkEvent *event, gpointer data)
{
  return FALSE;
}

gint eventDestroy(GtkWidget *widget, GdkEvent *event, gpointer data)
{
  gtk_main_quit();
  return 0;
}