mutter/doc/cookbook/examples/events-buttons-lasso.c

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/* Simple rectangle drawing using button and pointer events;
* click, drag and release a mouse button to draw a rectangle
*/
#include <stdlib.h>
#include <clutter/clutter.h>
static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
static const ClutterColor lasso_color = { 0xaa, 0xaa, 0xaa, 0x33 };
typedef struct
{
ClutterActor *actor;
gfloat x;
gfloat y;
} Lasso;
static guint
random_color_component ()
{
return (guint) (155 + (100.0 * rand () / (RAND_MAX + 1.0)));
}
static gboolean
button_pressed_cb (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
Lasso *lasso = (Lasso *) user_data;
/* start drawing the lasso actor */
lasso->actor = clutter_rectangle_new_with_color (&lasso_color);
/* store lasso's start coordinates */
clutter_event_get_coords (event, &(lasso->x), &(lasso->y));
clutter_container_add_actor (CLUTTER_CONTAINER (actor), lasso->actor);
return TRUE;
}
static gboolean
button_released_cb (ClutterActor *stage,
ClutterEvent *event,
gpointer user_data)
{
Lasso *lasso = (Lasso *) user_data;
ClutterActor *rectangle;
ClutterColor *random_color;
gfloat x;
gfloat y;
gfloat width;
gfloat height;
if (lasso->actor == NULL)
return TRUE;
/* create a new rectangle */
random_color = clutter_color_new (random_color_component (),
random_color_component (),
random_color_component (),
random_color_component ());
rectangle = clutter_rectangle_new_with_color (random_color);
/* set the rectangle to the same size and shape as the lasso */
clutter_actor_get_position (lasso->actor, &x, &y);
clutter_actor_get_size (lasso->actor, &width, &height);
clutter_actor_set_position (rectangle, x, y);
clutter_actor_set_size (rectangle, width, height);
clutter_container_add_actor (CLUTTER_CONTAINER (stage), rectangle);
/* clear up the lasso actor */
clutter_actor_destroy (lasso->actor);
lasso->actor = NULL;
clutter_actor_queue_redraw (stage);
return TRUE;
}
static gboolean
pointer_motion_cb (ClutterActor *stage,
ClutterEvent *event,
gpointer user_data)
{
gfloat pointer_x;
gfloat pointer_y;
gfloat new_x;
gfloat new_y;
gfloat width;
gfloat height;
Lasso *lasso = (Lasso *) user_data;
if (lasso->actor == NULL)
return TRUE;
/* redraw the lasso actor */
clutter_event_get_coords (event, &pointer_x, &pointer_y);
new_x = MIN (pointer_x, lasso->x);
new_y = MIN (pointer_y, lasso->y);
width = MAX (pointer_x, lasso->x) - new_x;
height = MAX (pointer_y, lasso->y) - new_y;
clutter_actor_set_position (lasso->actor, new_x, new_y);
clutter_actor_set_size (lasso->actor, width, height);
return TRUE;
}
int
main (int argc,
char *argv[])
{
Lasso *lasso = g_new0 (Lasso, 1);
ClutterActor *stage;
/* seed random number generator */
srand ((unsigned int) time (NULL));
if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
return 1;
stage = clutter_stage_new ();
clutter_actor_set_size (stage, 320, 240);
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
g_signal_connect (stage,
"button-press-event",
G_CALLBACK (button_pressed_cb),
lasso);
g_signal_connect (stage,
"button-release-event",
G_CALLBACK (button_released_cb),
lasso);
g_signal_connect (stage,
"motion-event",
G_CALLBACK (pointer_motion_cb),
lasso);
clutter_actor_show (stage);
clutter_main ();
g_free (lasso);
return EXIT_SUCCESS;
}