cookbook: Looping animation examples

Added code examples for creating a looped animation with
each of the animation approaches (implicit, ClutterAnimation,
ClutterState).

doc/cookbook/examples/Makefile.am

@@ -4,6 +4,9 @@ NULL =
 
 noinst_PROGRAMS = \
 	animations-complex	\
+	animations-looping-animator	\
+	animations-looping-implicit	\
+	animations-looping-state	\
 	animations-moving-animator	\
 	animations-moving-implicit	\
 	animations-moving-state	\
@@ -55,6 +58,9 @@ AM_CFLAGS = \
 AM_LDFLAGS = $(CLUTTER_LIBS) -export-dynamic
 
 animations_complex_SOURCES                 = animations-complex.c
+animations_looping_animator_SOURCES        = animations-looping-animator.c
+animations_looping_implicit_SOURCES        = animations-looping-implicit.c
+animations_looping_state_SOURCES           = animations-looping-state.c
 animations_moving_animator_SOURCES         = animations-moving-animator.c
 animations_moving_implicit_SOURCES         = animations-moving-implicit.c
 animations_moving_state_SOURCES            = animations-moving-state.c

doc/cookbook/examples/animations-looping-animator.c

@@ -0,0 +1,66 @@
+#include <stdlib.h>
+#include <clutter/clutter.h>
+
+static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
+static const ClutterColor red_color = { 0xff, 0x00, 0x00, 0xff };
+
+static gboolean
+key_pressed_cb (ClutterActor *actor,
+                ClutterEvent *event,
+                gpointer      user_data)
+{
+  ClutterTimeline *timeline = CLUTTER_TIMELINE (user_data);
+
+  if (!clutter_timeline_is_playing (timeline))
+    clutter_timeline_start (timeline);
+
+  return TRUE;
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  ClutterActor *stage;
+  ClutterActor *actor;
+  ClutterTimeline *timeline;
+  ClutterAnimator *animator;
+
+  clutter_init (&argc, &argv);
+
+  stage = clutter_stage_get_default ();
+  clutter_actor_set_size (stage, 300, 200);
+  clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
+  g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
+
+  actor = clutter_rectangle_new_with_color (&red_color);
+  clutter_actor_set_size (actor, 100, 100);
+  clutter_actor_set_position (actor, 150, 50);
+
+  timeline = clutter_timeline_new (2000);
+  clutter_timeline_set_loop (timeline, TRUE);
+
+  animator = clutter_animator_new ();
+  clutter_animator_set_timeline (animator, timeline);
+
+  clutter_animator_set (animator,
+                        actor, "x", CLUTTER_LINEAR, 0.0, 150.0,
+                        actor, "x", CLUTTER_LINEAR, 0.5, 50.0,
+                        actor, "x", CLUTTER_LINEAR, 1.0, 150.0,
+                        NULL);
+
+  clutter_container_add_actor (CLUTTER_CONTAINER (stage), actor);
+
+  g_signal_connect (stage,
+                    "key-press-event",
+                    G_CALLBACK (key_pressed_cb),
+                    timeline);
+
+  clutter_actor_show (stage);
+
+  clutter_main ();
+
+  g_object_unref (animator);
+
+  return EXIT_SUCCESS;
+}

doc/cookbook/examples/animations-looping-implicit.c

@@ -0,0 +1,87 @@
+#include <stdlib.h>
+#include <clutter/clutter.h>
+
+static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
+static const ClutterColor red_color = { 0xff, 0x00, 0x00, 0xff };
+
+typedef struct
+{
+  ClutterActor    *actor;
+  ClutterTimeline *timeline;
+} State;
+
+static void
+invert_timeline_cb (ClutterTimeline *timeline,
+                    gpointer         user_data)
+{
+  ClutterTimelineDirection direction = clutter_timeline_get_direction (timeline);
+
+  if (direction == CLUTTER_TIMELINE_FORWARD)
+    direction = CLUTTER_TIMELINE_BACKWARD;
+  else
+    direction = CLUTTER_TIMELINE_FORWARD;
+
+  clutter_timeline_set_direction (timeline, direction);
+}
+
+static gboolean
+key_pressed_cb (ClutterActor *actor,
+                ClutterEvent *event,
+                gpointer      user_data)
+{
+  State *state = (State *) user_data;
+
+  /* only start animating if actor isn't animating already */
+  if (clutter_actor_get_animation (state->actor) == NULL)
+    clutter_actor_animate_with_timeline (state->actor,
+                                         CLUTTER_LINEAR,
+                                         state->timeline,
+                                         "x", 50.0,
+                                         NULL);
+
+  return TRUE;
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  State *state = g_new0 (State, 1);
+
+  ClutterActor *stage;
+
+  clutter_init (&argc, &argv);
+
+  stage = clutter_stage_get_default ();
+  clutter_actor_set_size (stage, 300, 200);
+  clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
+  g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
+
+  state->actor = clutter_rectangle_new_with_color (&red_color);
+  clutter_actor_set_size (state->actor, 100, 100);
+  clutter_actor_set_position (state->actor, 150, 50);
+
+  state->timeline = clutter_timeline_new (1000);
+  clutter_timeline_set_loop (state->timeline, TRUE);
+
+  g_signal_connect (stage,
+                    "key-press-event",
+                    G_CALLBACK (key_pressed_cb),
+                    state);
+
+  g_signal_connect (state->timeline,
+                    "completed",
+                    G_CALLBACK (invert_timeline_cb),
+                    NULL);
+
+  clutter_container_add_actor (CLUTTER_CONTAINER (stage), state->actor);
+
+  clutter_actor_show (stage);
+
+  clutter_main ();
+
+  g_object_unref (state->timeline);
+  g_free (state);
+
+  return EXIT_SUCCESS;
+}

doc/cookbook/examples/animations-looping-state.c

@@ -0,0 +1,83 @@
+#include <stdlib.h>
+#include <clutter/clutter.h>
+
+static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
+static const ClutterColor red_color = { 0xff, 0x00, 0x00, 0xff };
+
+static void
+next_state (ClutterState *transitions,
+            gpointer      user_data)
+{
+  const gchar *state = clutter_state_get_state (transitions);
+
+  if (g_strcmp0 (state, "right") == 0)
+    clutter_state_set_state (transitions, "left");
+  else
+    clutter_state_set_state (transitions, "right");
+}
+
+static gboolean
+key_pressed_cb (ClutterActor *actor,
+                ClutterEvent *event,
+                gpointer      user_data)
+{
+  ClutterState *transitions = CLUTTER_STATE (user_data);
+
+  if (!clutter_timeline_is_playing (clutter_state_get_timeline (transitions)))
+    next_state (transitions, NULL);
+
+  return TRUE;
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  ClutterActor *stage;
+  ClutterActor *actor;
+  ClutterState *transitions;
+
+  clutter_init (&argc, &argv);
+
+  stage = clutter_stage_get_default ();
+  clutter_actor_set_size (stage, 300, 200);
+  clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
+  g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
+
+  actor = clutter_rectangle_new_with_color (&red_color);
+  clutter_actor_set_position (actor, 150, 50);
+  clutter_actor_set_size (actor, 100, 100);
+
+  transitions = clutter_state_new ();
+  clutter_state_set_duration (transitions, NULL, NULL, 1000);
+
+  clutter_state_set (transitions, NULL, "right",
+                     actor, "x", CLUTTER_LINEAR, 150.0,
+                     NULL);
+
+  clutter_state_set (transitions, NULL, "left",
+                     actor, "x", CLUTTER_LINEAR, 50.0,
+                     NULL);
+
+  clutter_state_warp_to_state (transitions, "right");
+
+  g_signal_connect (stage,
+                    "key-press-event",
+                    G_CALLBACK (key_pressed_cb),
+                    transitions);
+
+  g_signal_connect (transitions,
+                    "completed",
+                    G_CALLBACK (next_state),
+                    NULL);
+
+  clutter_container_add_actor (CLUTTER_CONTAINER (stage), actor);
+
+  clutter_actor_show (stage);
+
+  clutter_main ();
+
+  g_object_unref (transitions);
+
+  return EXIT_SUCCESS;
+}