mutter/doc/cookbook/examples/layouts-stacking.c

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/*
* Display multiple rotated copies of an image on top of each other
*
* Invoke with the path to a file to load a custom image
*/
#include <clutter/clutter.h>
#define STAGE_SIDE 512
static const ClutterColor box_color = { 0x33, 0x33, 0x55, 0xff };
int
main (int argc, char *argv[])
{
gchar *filename = TESTS_DATA_DIR "/redhand.png";
if (argc > 1)
filename = argv[1];
ClutterLayoutManager *layout;
ClutterActor *box;
ClutterActor *stage;
ClutterActor *texture;
CoglHandle *cogl_texture;
GError *error = NULL;
gfloat width;
clutter_init (&argc, &argv);
stage = clutter_stage_get_default ();
clutter_actor_set_size (stage, STAGE_SIDE, STAGE_SIDE);
layout = clutter_bin_layout_new (CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_BIN_ALIGNMENT_CENTER);
box = clutter_box_new (layout);
clutter_box_set_color (CLUTTER_BOX (box), &box_color);
texture = clutter_texture_new_from_file (filename, &error);
if (error != NULL)
g_error ("Error loading file %s; message was:\n%s",
filename,
error->message);
/*
* get a reference to the underlying Cogl texture
* for copying onto each Clutter texture placed into the layout
*/
cogl_texture = clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (texture));
/*
* add gradually turning and shrinking textures,
* smallest one last; each actor ends up on top
* of the one added just before it
*/
for (width = STAGE_SIDE * 0.75; width >= STAGE_SIDE * 0.0625; width -= STAGE_SIDE * 0.0625)
{
ClutterActor *texture_copy = clutter_texture_new ();
clutter_texture_set_cogl_texture (CLUTTER_TEXTURE (texture_copy),
cogl_texture);
clutter_texture_set_keep_aspect_ratio (CLUTTER_TEXTURE (texture_copy),
TRUE);
clutter_actor_set_z_rotation_from_gravity (texture_copy,
(gfloat)(width * 0.5) - (STAGE_SIDE * 0.03125),
CLUTTER_GRAVITY_CENTER);
clutter_actor_set_width (texture_copy, width);
clutter_container_add_actor (CLUTTER_CONTAINER (box), texture_copy);
}
clutter_actor_add_constraint (box, clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0.5));
clutter_actor_add_constraint (box, clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.5));
clutter_container_add_actor (CLUTTER_CONTAINER (stage), box);
clutter_actor_show (stage);
clutter_main ();
return 0;
}