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mutter-performance-source/doc/cookbook/examples/animations-scaling.c

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#include <stdlib.h>
#include <clutter/clutter.h>
typedef struct
{
ClutterState *transitions;
ClutterActor *actor;
ClutterActor *props_display;
guint scale_gravity;
gboolean transitions_running;
} State;
static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
static const ClutterColor red_color = { 0xff, 0x00, 0x00, 0xff };
static const ClutterColor yellow_color = { 0xff, 0xff, 0x00, 0xff };
static void
show_scale_properties_cb (ClutterActor *actor,
gpointer user_data)
{
State *state = (State *) user_data;
gfloat transformed_x, transformed_y;
gfloat transformed_width, transformed_height;
gfloat scale_center_x, scale_center_y;
gchar *message;
clutter_actor_get_transformed_position (state->actor,
&transformed_x,
&transformed_y);
clutter_actor_get_transformed_size (state->actor,
&transformed_width,
&transformed_height);
g_object_get (G_OBJECT (actor),
"scale-center-x", &scale_center_x,
"scale-center-y", &scale_center_y,
NULL);
/* draw cross on the scale center */
cogl_set_source_color4ub (255, 255, 0, 255);
cogl_path_move_to (scale_center_x, scale_center_y);
cogl_path_rel_line_to (10, 10);
cogl_path_rel_line_to (-20, -20);
cogl_path_move_to (scale_center_x, scale_center_y);
cogl_path_rel_line_to (10, -10);
cogl_path_rel_line_to (-20, 20);
cogl_path_stroke ();
/* show actor properties */
message = g_strdup_printf ("Scale center: %.0f, %.0f\n"
"Transformed position: %.2f, %.2f\n"
"Transformed size: %.2f, %.2f",
scale_center_x, scale_center_y,
transformed_x, transformed_y,
transformed_width, transformed_height);
clutter_text_set_text (CLUTTER_TEXT (state->props_display), message);
g_free (message);
}
static void
next_transition_cb (ClutterState *transitions,
gpointer user_data)
{
State *state = (State *) user_data;
if (clutter_actor_is_scaled (state->actor))
clutter_state_set_state (state->transitions, "not-scaled");
else if (state->scale_gravity > 9)
{
/* gravity is at center, so reset ready for next key press */
state->scale_gravity = CLUTTER_GRAVITY_NORTH;
state->transitions_running = FALSE;
}
else
{
g_object_set (G_OBJECT (state->actor),
"scale-gravity", state->scale_gravity,
NULL);
state->scale_gravity++;
clutter_state_set_state (state->transitions, "scaled-down");
}
}
static gboolean
key_pressed_cb (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
State *state = (State *) user_data;
if (!state->transitions_running)
{
state->transitions_running = TRUE;
next_transition_cb (NULL, state);
}
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, 350, 350);
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
state->scale_gravity = CLUTTER_GRAVITY_NORTH;
state->transitions_running = FALSE;
state->props_display = clutter_text_new ();
clutter_actor_set_size (state->props_display, 340, 80);
clutter_actor_set_position (state->props_display, 5, 280);
clutter_text_set_color (CLUTTER_TEXT (state->props_display), &yellow_color);
state->actor = clutter_rectangle_new_with_color (&red_color);
clutter_actor_set_size (state->actor, 200, 200);
clutter_actor_set_position (state->actor, 75, 50);
g_object_set (G_OBJECT (state->actor),
"scale-gravity", state->scale_gravity,
NULL);
state->transitions = clutter_state_new ();
clutter_state_set_duration (state->transitions, NULL, NULL, 400);
clutter_state_set (state->transitions, NULL, "not-scaled",
state->actor, "scale-x", CLUTTER_LINEAR, 1.0,
state->actor, "scale-y", CLUTTER_LINEAR, 1.0,
NULL);
clutter_state_set (state->transitions, NULL, "scaled-down",
state->actor, "scale-x", CLUTTER_LINEAR, 0.25,
state->actor, "scale-y", CLUTTER_LINEAR, 0.25,
NULL);
clutter_state_warp_to_state (state->transitions, "not-scaled");
g_signal_connect (stage,
"key-press-event",
G_CALLBACK (key_pressed_cb),
state);
g_signal_connect (state->transitions,
"completed",
G_CALLBACK (next_transition_cb),
state);
g_signal_connect_after (state->actor,
"paint",
G_CALLBACK (show_scale_properties_cb),
state);
clutter_container_add (CLUTTER_CONTAINER (stage),
state->actor,
state->props_display,
NULL);
clutter_actor_show (stage);
clutter_main ();
g_object_unref (state->transitions);
g_free (state);
return EXIT_SUCCESS;
}