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cookbook: Simple example to demonstrate bind constraint

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A simple example showing how to scale an actor to the stage.

Demonstrates ClutterBindConstraint and ClutterAlignConstraint
in a fashion suitable for a short recipe.
This commit is contained in:
Elliot Smith 2010-09-15 16:05:15 +01:00
parent a0f63a3153
commit 8a149521ce
2 changed files with 57 additions and 0 deletions
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2
doc/cookbook/examples/Makefile.am
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@ -11,6 +11,7 @@ noinst_PROGRAMS = \
textures-split-go \
textures-sub-texture \
layouts-bind-constraint-overlay \
layouts-bind-constraint-stage \
layouts-stacking \
layouts-stacking-diff-sized-actors \
events-mouse-scroll \
@ -54,6 +55,7 @@ textures_reflection_SOURCES = textures-reflection.c
textures_split_go_SOURCES = textures-split-go.c
textures_sub_texture_SOURCES = textures-sub-texture.c
layouts_bind_constraint_overlay_SOURCES = layouts-bind-constraint-overlay.c
layouts_bind_constraint_stage_SOURCES = layouts-bind-constraint-stage.c
layouts_stacking_SOURCES = layouts-stacking.c
layouts_stacking_diff_sized_actors_SOURCES = layouts-stacking-diff-sized-actors.c
events_mouse_scroll_SOURCES = events-mouse-scroll.c

55
doc/cookbook/examples/layouts-bind-constraint-stage.c Normal file
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@ -0,0 +1,55 @@
#include <stdlib.h>
#include <clutter/clutter.h>
static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
static const ClutterColor rectangle_color = { 0xaa, 0x99, 0x00, 0xff };
int
main (int argc, char *argv[])
{
/* the stage is the "source" for constraints on the texture */
ClutterActor *stage;
/* the "target" actor which will be bound by the constraints */
ClutterActor *texture;
ClutterConstraint *width_binding;
ClutterConstraint *height_binding;
clutter_init (&argc, &argv);
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);
/* make the stage resizable */
clutter_stage_set_user_resizable (CLUTTER_STAGE (stage), TRUE);
texture = clutter_texture_new ();
clutter_actor_set_opacity (texture, 50);
clutter_texture_set_repeat (CLUTTER_TEXTURE (texture), TRUE, TRUE);
clutter_texture_set_from_file (CLUTTER_TEXTURE (texture), "smiley.png", NULL);
/* the texture's width will be 100px less than the stage's */
width_binding = clutter_bind_constraint_new (stage, CLUTTER_BIND_WIDTH, -100);
/* the texture's height will be 100px less than the stage's */
height_binding = clutter_bind_constraint_new (stage, CLUTTER_BIND_HEIGHT, -100);
/* add the constraints to the texture */
clutter_actor_add_constraint (texture, width_binding);
clutter_actor_add_constraint (texture, height_binding);
/* add some alignment constraints */
clutter_actor_add_constraint (texture, clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0.5));
clutter_actor_add_constraint (texture, clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.5));
clutter_container_add_actor (CLUTTER_CONTAINER (stage), texture);
clutter_actor_show (stage);
clutter_main ();
return EXIT_SUCCESS;
}