mutter/tests/test-depth.c

#include <stdlib.h>
#include <clutter/clutter.h>

/* this is a rather contrieved test case emulating a CLUTTER_ALPHA_RAMP
 * with two half-ramps. it shows that the direction of the motion on the
 * Z axis of a ClutterBehaviourDepth is controlled by the ClutterAlpha
 * and not by the minimum and maximum depth.
 */

static gboolean zoom_in = TRUE;
static ClutterBehaviour *d_behave = NULL;

static void
timeline_completed (ClutterTimeline *timeline,
                    gpointer         user_data)
{
  ClutterAlpha *alpha;
  gint min_depth, max_depth;

  if (zoom_in)
    {
      alpha = clutter_alpha_new_full (timeline,
                                      CLUTTER_ALPHA_RAMP_INC,
                                      NULL, NULL);
      min_depth = -100;
      max_depth = 0;
      zoom_in = FALSE;
    }
  else
    {
      alpha = clutter_alpha_new_full (timeline,
                                      CLUTTER_ALPHA_RAMP_DEC,
                                      NULL, NULL);
      min_depth = 0;
      max_depth = -100;
      zoom_in = TRUE;
    }

  g_object_set (G_OBJECT (d_behave),
                "min-depth", min_depth,
                "max-depth", max_depth,
                NULL);
  clutter_behaviour_set_alpha (d_behave, alpha);

  clutter_timeline_rewind (timeline);
  clutter_timeline_start (timeline);
}

int
main (int argc, char *argv[])
{
  ClutterTimeline *timeline;
  ClutterActor *stage;
  ClutterActor *hand, *label;
  ClutterColor stage_color = { 0xcc, 0xcc, 0xcc, 0xff };
  GdkPixbuf *pixbuf;
  GError *error;

  clutter_init (&argc, &argv);

  error = NULL;
  pixbuf = gdk_pixbuf_new_from_file ("redhand.png", &error);
  if (error)
    g_error ("Unable to load redhand.png: %s", error->message);

  stage = clutter_stage_get_default ();
  clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
  g_signal_connect (stage,
                    "button-press-event", G_CALLBACK (clutter_main_quit),
                    NULL);

  hand = clutter_texture_new_from_pixbuf (pixbuf);
  clutter_actor_set_position (hand, 240, 140);
  clutter_actor_show (hand);

  label = clutter_label_new_with_text ("Mono 26", "Clutter");
  clutter_actor_set_position (label, 100, 100);
  clutter_actor_show (label);

  clutter_container_add (CLUTTER_CONTAINER (stage), hand, label, NULL);

  /* five seconds, at 50 fps */
  timeline = clutter_timeline_new (250, 50);
  g_signal_connect (timeline,
                    "completed", G_CALLBACK (timeline_completed),
                    NULL);

  d_behave = clutter_behaviour_depth_new (clutter_alpha_new_full (timeline,
                                                                  CLUTTER_ALPHA_RAMP_DEC,
                                                                  NULL, NULL),
                                          0, -100);
  clutter_behaviour_apply (d_behave, hand);
  clutter_behaviour_apply (d_behave, label);

  clutter_actor_show (stage);

  clutter_timeline_start (timeline);

  clutter_main ();

  g_object_unref (d_behave);
  g_object_unref (timeline);

  return EXIT_SUCCESS;
}