mirror of
https://github.com/brl/mutter.git
synced 2024-12-24 12:02:04 +00:00
aece642adb
Make sure users get the idea that clutter_init()
has a return value that needs to be checked.
These were fixed via sed magic:
sed -i -s -e "s/clutter_init (.*)/\
if (& != CLUTTER_INIT_SUCCESS)\n return 1/"\
doc/*/*/*.{c,xml} doc/*/*.xml
http://bugzilla.clutter-project.org/show_bug.cgi?id=2574
130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
#include <stdlib.h>
|
|
#include <clutter/clutter.h>
|
|
|
|
#define STAGE_SIDE 400.0
|
|
|
|
static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
|
|
static const ClutterColor red_color = { 0xff, 0x00, 0x00, 0xff };
|
|
|
|
/* Build a "circular" path out of 4 Bezier curves
|
|
*
|
|
* code modified from
|
|
* http://git.clutter-project.org/dax/tree/dax/dax-traverser-clutter.c#n328
|
|
*
|
|
* see http://www.whizkidtech.redprince.net/bezier/circle/
|
|
* for further explanation
|
|
*/
|
|
static ClutterPath *
|
|
build_circular_path (gfloat cx,
|
|
gfloat cy,
|
|
gfloat r)
|
|
{
|
|
ClutterPath *path;
|
|
static gfloat kappa = 4 * (G_SQRT2 - 1) / 3;
|
|
|
|
path = clutter_path_new ();
|
|
|
|
clutter_path_add_move_to (path, cx + r, cy);
|
|
clutter_path_add_curve_to (path,
|
|
cx + r, cy + r * kappa,
|
|
cx + r * kappa, cy + r,
|
|
cx, cy + r);
|
|
clutter_path_add_curve_to (path,
|
|
cx - r * kappa, cy + r,
|
|
cx - r, cy + r * kappa,
|
|
cx - r, cy);
|
|
clutter_path_add_curve_to (path,
|
|
cx - r, cy - r * kappa,
|
|
cx - r * kappa, cy - r,
|
|
cx, cy - r);
|
|
clutter_path_add_curve_to (path,
|
|
cx + r * kappa, cy - r,
|
|
cx + r, cy - r * kappa,
|
|
cx + r, cy);
|
|
clutter_path_add_close (path);
|
|
|
|
return path;
|
|
}
|
|
|
|
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[])
|
|
{
|
|
ClutterPath *path;
|
|
ClutterConstraint *constraint;
|
|
ClutterAnimator *animator;
|
|
ClutterTimeline *timeline;
|
|
ClutterActor *stage;
|
|
ClutterActor *rectangle;
|
|
|
|
if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
|
|
return 1;
|
|
|
|
stage = clutter_stage_new ();
|
|
clutter_actor_set_size (stage, STAGE_SIDE, STAGE_SIDE);
|
|
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
|
|
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
|
|
|
|
rectangle = clutter_rectangle_new_with_color (&red_color);
|
|
clutter_actor_set_size (rectangle, STAGE_SIDE / 8, STAGE_SIDE / 8);
|
|
clutter_actor_set_position (rectangle,
|
|
STAGE_SIDE / 2,
|
|
STAGE_SIDE / 2);
|
|
|
|
clutter_container_add_actor (CLUTTER_CONTAINER (stage),
|
|
rectangle);
|
|
|
|
/* set up a path and make a constraint with it */
|
|
path = build_circular_path (STAGE_SIDE / 2,
|
|
STAGE_SIDE / 2,
|
|
STAGE_SIDE / 4);
|
|
constraint = clutter_path_constraint_new (path, 0.0);
|
|
|
|
/* apply the constraint to the rectangle; note that there
|
|
* is no need to name the constraint, as we will be animating
|
|
* the constraint's offset property directly using ClutterAnimator
|
|
*/
|
|
clutter_actor_add_constraint (rectangle, constraint);
|
|
|
|
/* animation to animate the path offset */
|
|
animator = clutter_animator_new ();
|
|
clutter_animator_set_duration (animator, 5000);
|
|
|
|
/* use ClutterAnimator to animate the constraint directly */
|
|
clutter_animator_set (animator,
|
|
constraint, "offset", CLUTTER_LINEAR, 0.0, 0.0,
|
|
constraint, "offset", CLUTTER_LINEAR, 1.0, 1.0,
|
|
NULL);
|
|
|
|
timeline = clutter_animator_get_timeline (animator);
|
|
clutter_timeline_set_loop (timeline, TRUE);
|
|
clutter_timeline_set_auto_reverse (timeline, TRUE);
|
|
|
|
g_signal_connect (stage,
|
|
"key-press-event",
|
|
G_CALLBACK (key_pressed_cb),
|
|
timeline);
|
|
|
|
clutter_actor_show (stage);
|
|
|
|
clutter_main ();
|
|
|
|
/* clean up */
|
|
g_object_unref (animator);
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|