int
main (int argc,
char *argv[])
{
ClutterActor *stage;
ClutterPath *path;
ClutterConstraint *constraint;
ClutterActor *rectangle;
ClutterTimeline *timeline;
const ClutterColor *stage_color = clutter_color_new (51, 51, 85, 255);
const ClutterColor *red_color = clutter_color_new (255, 0, 0, 255);
clutter_init (&argc, &argv);
stage = clutter_stage_new ();
clutter_actor_set_size (stage, 360, 300);
clutter_stage_set_color (CLUTTER_STAGE (stage), stage_color);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
/* create the path */
path = clutter_path_new ();
clutter_path_add_move_to (path, 30, 60);
/* add a curve round to the top-right of the stage */
clutter_path_add_rel_curve_to (path,
120, 180,
180, 120,
240, 0);
/* create a constraint based on the path */
constraint = clutter_path_constraint_new (path, 0.0);
/* put a rectangle at the start of the path */
rectangle = clutter_rectangle_new_with_color (red_color);
clutter_actor_set_size (rectangle, 60, 60);
/* add the constraint to the rectangle */
clutter_actor_add_constraint_with_name (rectangle, "path", constraint);
/* add the rectangle to the stage */
clutter_container_add_actor (CLUTTER_CONTAINER (stage), rectangle);
/* set up the timeline */
timeline = clutter_timeline_new (1000);
clutter_timeline_set_loop (timeline, TRUE);
clutter_timeline_set_auto_reverse (timeline, TRUE);
clutter_actor_animate_with_timeline (rectangle, CLUTTER_LINEAR, timeline,
"@constraints.path.offset", 1.0,
NULL);
clutter_actor_show (stage);
clutter_main ();
return EXIT_SUCCESS;
}
static gboolean
path_test_add_move_to (CallbackData *data)
{
ClutterPathNode node = { 0, };
node.type = CLUTTER_PATH_MOVE_TO;
node.points[0].x = 1;
node.points[0].y = 2;
clutter_path_add_move_to (data->path, node.points[0].x, node.points[0].y);
data->nodes[data->n_nodes++] = node;
return TRUE;
}
/**
* clutter_behaviour_path_new_with_knots:
* @alpha: (allow-none): a #ClutterAlpha instance, or %NULL
* @knots: an array of #ClutterKnot<!-- -->s
* @n_knots: number of entries in @knots
*
* Creates a new path behaviour that will make the actors visit all of
* the given knots in order with straight lines in between.
*
* A path will be created where the first knot is used in a
* %CLUTTER_PATH_MOVE_TO and the subsequent knots are used in
* %CLUTTER_PATH_LINE_TO<!-- -->s.
*
* If @alpha is not %NULL, the #ClutterBehaviour will take ownership
* of the #ClutterAlpha instance. In the case when @alpha is %NULL,
* it can be set later with clutter_behaviour_set_alpha().
*
* Return value: (transfer full): a #ClutterBehaviour
*
* Since: 1.0
*
* Deprecated: 1.6
*/
ClutterBehaviour *
clutter_behaviour_path_new_with_knots (ClutterAlpha *alpha,
const ClutterKnot *knots,
guint n_knots)
{
ClutterPath *path = clutter_path_new ();
guint i;
if (n_knots > 0)
{
clutter_path_add_move_to (path, knots[0].x, knots[0].y);
for (i = 1; i < n_knots; i++)
clutter_path_add_line_to (path, knots[i].x, knots[i].y);
}
return g_object_new (CLUTTER_TYPE_BEHAVIOUR_PATH,
"alpha", alpha,
"path", path,
NULL);
}
