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Show how to animate an actor using a ClutterPathConstraint. This demonstrates how to get effects similar to ClutterPathBehaviour with the modern animation APIs. Includes 3 examples: 1) Simple ClutterPathConstraint used with implicit animations 2) ClutterPathConstraint used to simulate circular animation, using ClutterAnimator 3) Creating simple curved path animations with non-linear easing
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
#include <stdlib.h>
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#include <clutter/clutter.h>
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int
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main (int argc,
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char *argv[])
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{
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ClutterActor *stage;
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ClutterPath *path;
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ClutterConstraint *constraint;
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ClutterActor *rectangle;
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ClutterTimeline *timeline;
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const ClutterColor *stage_color = clutter_color_new (51, 51, 85, 255);
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const ClutterColor *red_color = clutter_color_new (255, 0, 0, 255);
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clutter_init (&argc, &argv);
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stage = clutter_stage_new ();
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clutter_actor_set_size (stage, 360, 300);
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clutter_stage_set_color (CLUTTER_STAGE (stage), stage_color);
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g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
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/* create the path */
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path = clutter_path_new ();
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clutter_path_add_move_to (path, 30, 60);
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/* add a curve round to the top-right of the stage */
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clutter_path_add_rel_curve_to (path,
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120, 180,
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180, 120,
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240, 0);
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/* create a constraint based on the path */
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constraint = clutter_path_constraint_new (path, 0.0);
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/* put a rectangle at the start of the path */
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rectangle = clutter_rectangle_new_with_color (red_color);
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clutter_actor_set_size (rectangle, 60, 60);
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/* add the constraint to the rectangle */
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clutter_actor_add_constraint_with_name (rectangle, "path", constraint);
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/* add the rectangle to the stage */
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clutter_container_add_actor (CLUTTER_CONTAINER (stage), rectangle);
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/* set up the timeline */
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timeline = clutter_timeline_new (1000);
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clutter_timeline_set_loop (timeline, TRUE);
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clutter_timeline_set_auto_reverse (timeline, TRUE);
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clutter_actor_animate_with_timeline (rectangle, CLUTTER_LINEAR, timeline,
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"@constraints.path.offset", 1.0,
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NULL);
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clutter_actor_show (stage);
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clutter_main ();
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return EXIT_SUCCESS;
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}
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