mirror of
https://github.com/brl/mutter.git
synced 2024-11-12 17:27:03 -05:00
cookbook: Added scribble example for pointer motion recipe
Simple scribbler application which demonstrates tracking mouse enter and motion events on a texture, drawing with COGL and ClutterPath as they occur.
This commit is contained in:
parent
b648bff10c
commit
7c196d31b4
@ -12,6 +12,7 @@ noinst_PROGRAMS = \
|
||||
layouts-stacking-diff-sized-actors \
|
||||
events-mouse-scroll \
|
||||
events-pointer-motion-crossing \
|
||||
events-pointer-motion-scribbler \
|
||||
$(NULL)
|
||||
|
||||
INCLUDES = \
|
||||
@ -42,5 +43,6 @@ 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
|
||||
events_pointer_motion_crossing_SOURCES = events-pointer-motion-crossing.c
|
||||
events_pointer_motion_scribbler_SOURCES = events-pointer-motion-scribbler.c
|
||||
|
||||
-include $(top_srcdir)/build/autotools/Makefile.am.gitignore
|
||||
|
160
doc/cookbook/examples/events-pointer-motion-scribbler.c
Normal file
160
doc/cookbook/examples/events-pointer-motion-scribbler.c
Normal file
@ -0,0 +1,160 @@
|
||||
/*
|
||||
* 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)
|
||||
{
|
||||
g_return_if_fail (node != NULL);
|
||||
|
||||
ClutterKnot knot;
|
||||
|
||||
switch (node->type)
|
||||
{
|
||||
case CLUTTER_PATH_MOVE_TO:
|
||||
knot = node->points[0];
|
||||
cogl_path_move_to (knot.x, knot.y);
|
||||
g_debug ("move to %d, %d", 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 %d, %d", knot.x, knot.y);
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
_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
|
||||
_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
|
||||
_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;
|
||||
|
||||
clutter_init (&argc, &argv);
|
||||
|
||||
context->path = clutter_path_new ();
|
||||
|
||||
cogl_path_new ();
|
||||
context->cogl_path = cogl_get_path ();
|
||||
|
||||
stage = clutter_stage_get_default ();
|
||||
clutter_actor_set_size (stage, 400, 400);
|
||||
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
|
||||
|
||||
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 (_motion_cb),
|
||||
context);
|
||||
|
||||
g_signal_connect (canvas,
|
||||
"enter-event",
|
||||
G_CALLBACK (_enter_cb),
|
||||
context);
|
||||
|
||||
g_signal_connect (canvas,
|
||||
"paint",
|
||||
G_CALLBACK (_paint_cb),
|
||||
context);
|
||||
|
||||
clutter_actor_show (stage);
|
||||
|
||||
clutter_main ();
|
||||
|
||||
g_object_unref (context->path);
|
||||
g_free (context);
|
||||
|
||||
return 0;
|
||||
}
|
Loading…
Reference in New Issue
Block a user