mutter/doc/cookbook/examples/animations-path-easing.c

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#include <stdlib.h>
#include <clutter/clutter.h>
typedef struct {
ClutterActor *red;
ClutterActor *green;
ClutterTimeline *timeline;
} State;
static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
static const ClutterColor red_color = { 0xff, 0x00, 0x00, 0xff };
static const ClutterColor green_color = { 0x00, 0xff, 0x00, 0xff };
static void
reverse_timeline (ClutterTimeline *timeline)
{
ClutterTimelineDirection dir = clutter_timeline_get_direction (timeline);
if (dir == CLUTTER_TIMELINE_FORWARD)
dir = CLUTTER_TIMELINE_BACKWARD;
else
dir = CLUTTER_TIMELINE_FORWARD;
clutter_timeline_set_direction (timeline, dir);
}
/* a key press either starts the timeline or reverses it */
static gboolean
key_pressed_cb (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
State *state = (State *) user_data;
if (clutter_timeline_is_playing (state->timeline))
reverse_timeline (state->timeline);
else
clutter_timeline_start (state->timeline);
return TRUE;
}
int
main (int argc,
char *argv[])
{
State *state = g_new0 (State, 1);
ClutterActor *stage;
ClutterAnimator *animator;
if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
return 1;
stage = clutter_stage_new ();
clutter_actor_set_size (stage, 400, 400);
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
state->red = clutter_rectangle_new_with_color (&red_color);
clutter_actor_set_size (state->red, 100, 100);
clutter_actor_set_position (state->red, 300, 300);
state->green = clutter_rectangle_new_with_color (&green_color);
clutter_actor_set_size (state->green, 100, 100);
clutter_actor_set_position (state->green, 0, 0);
animator = clutter_animator_new ();
clutter_animator_set_duration (animator, 1000);
clutter_animator_set (animator,
state->red, "x", CLUTTER_LINEAR, 0.0, 300.0,
state->red, "y", CLUTTER_LINEAR, 0.0, 300.0,
state->red, "x", CLUTTER_LINEAR, 1.0, 0.0,
state->red, "y", CLUTTER_EASE_IN_QUINT, 1.0, 0.0,
NULL);
clutter_animator_set (animator,
state->green, "x", CLUTTER_LINEAR, 0.0, 0.0,
state->green, "y", CLUTTER_LINEAR, 0.0, 0.0,
state->green, "x", CLUTTER_LINEAR, 1.0, 300.0,
state->green, "y", CLUTTER_EASE_IN_QUINT, 1.0, 300.0,
NULL);
state->timeline = clutter_animator_get_timeline (animator);
clutter_timeline_set_auto_reverse (state->timeline, TRUE);
g_signal_connect (stage,
"key-press-event",
G_CALLBACK (key_pressed_cb),
state);
clutter_container_add (CLUTTER_CONTAINER (stage), state->red, state->green, NULL);
clutter_actor_show (stage);
clutter_main ();
g_object_unref (animator);
g_free (state);
return EXIT_SUCCESS;
}