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mutter/doc/cookbook/examples/events-pointer-motion-scribbler.c
2013-05-03 10:11:25 -04:00

163 lines
4.3 KiB
C

/*
* Simple scribble application: move mouse over the dark yellow
* rectangle to draw brighter yellow lines
*/
#include <clutter/clutter.h>
static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
static const ClutterColor actor_color = { 0xaa, 0x99, 0x00, 0xff };
typedef struct {
ClutterPath *path;
CoglPath *cogl_path;
} Context;
static void
_convert_clutter_path_node_to_cogl_path (const ClutterPathNode *node,
gpointer data)
{
ClutterPoint knot;
g_return_if_fail (node != NULL);
switch (node->type)
{
case CLUTTER_PATH_MOVE_TO:
knot = node->points[0];
cogl_path_move_to (knot.x, knot.y);
g_debug ("move to %f, %f", knot.x, knot.y);
break;
case CLUTTER_PATH_LINE_TO:
knot = node->points[0];
cogl_path_line_to (knot.x, knot.y);
g_debug ("line to %f, %f", knot.x, knot.y);
break;
default:
break;
}
}
static void
_canvas_paint_cb (ClutterActor *actor,
gpointer user_data)
{
Context *context = (Context *)user_data;
cogl_set_source_color4ub (255, 255, 0, 255);
cogl_set_path (context->cogl_path);
clutter_path_foreach (context->path, _convert_clutter_path_node_to_cogl_path, NULL);
cogl_path_stroke_preserve ();
clutter_path_clear (context->path);
context->cogl_path = cogl_get_path ();
g_signal_stop_emission_by_name (actor, "paint");
}
static gboolean
_pointer_motion_cb (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
ClutterMotionEvent *motion_event = (ClutterMotionEvent *)event;
Context *context = (Context *)user_data;
gfloat x, y;
clutter_actor_transform_stage_point (actor, motion_event->x, motion_event->y, &x, &y);
g_debug ("motion; x %f, y %f", x, y);
clutter_path_add_line_to (context->path, x, y);
clutter_actor_queue_redraw (actor);
return TRUE;
}
static gboolean
_pointer_enter_cb (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
ClutterCrossingEvent *cross_event = (ClutterCrossingEvent *)event;
Context *context = (Context *)user_data;
gfloat x, y;
clutter_actor_transform_stage_point (actor, cross_event->x, cross_event->y, &x, &y);
g_debug ("enter; x %f, y %f", x, y);
clutter_path_add_move_to (context->path, x, y);
clutter_actor_queue_redraw (actor);
return TRUE;
}
int
main (int argc, char *argv[])
{
Context *context = g_new0 (Context, 1);
ClutterActor *stage;
ClutterActor *rect;
ClutterActor *canvas;
if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
return 1;
context->path = clutter_path_new ();
cogl_path_new ();
context->cogl_path = cogl_get_path ();
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);
rect = clutter_rectangle_new_with_color (&actor_color);
clutter_actor_set_size (rect, 300, 300);
clutter_actor_add_constraint (rect, clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0.5));
clutter_actor_add_constraint (rect, clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.5));
clutter_container_add_actor (CLUTTER_CONTAINER (stage), rect);
canvas = clutter_texture_new ();
clutter_actor_set_size (canvas, 300, 300);
clutter_actor_add_constraint (canvas, clutter_align_constraint_new (rect, CLUTTER_ALIGN_X_AXIS, 0.0));
clutter_actor_add_constraint (canvas, clutter_align_constraint_new (rect, CLUTTER_ALIGN_Y_AXIS, 0.0));
clutter_actor_set_reactive (canvas, TRUE);
clutter_container_add_actor (CLUTTER_CONTAINER (stage), canvas);
clutter_actor_raise_top (canvas);
g_signal_connect (canvas,
"motion-event",
G_CALLBACK (_pointer_motion_cb),
context);
g_signal_connect (canvas,
"enter-event",
G_CALLBACK (_pointer_enter_cb),
context);
g_signal_connect (canvas,
"paint",
G_CALLBACK (_canvas_paint_cb),
context);
clutter_actor_show (stage);
clutter_main ();
g_object_unref (context->path);
g_free (context);
return 0;
}