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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.
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@ -12,6 +12,7 @@ noinst_PROGRAMS = \
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layouts-stacking-diff-sized-actors \
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events-mouse-scroll \
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events-pointer-motion-crossing \
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events-pointer-motion-scribbler \
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$(NULL)
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INCLUDES = \
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@ -42,5 +43,6 @@ layouts_stacking_SOURCES = layouts-stacking.c
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layouts_stacking_diff_sized_actors_SOURCES = layouts-stacking-diff-sized-actors.c
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events_mouse_scroll_SOURCES = events-mouse-scroll.c
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events_pointer_motion_crossing_SOURCES = events-pointer-motion-crossing.c
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events_pointer_motion_scribbler_SOURCES = events-pointer-motion-scribbler.c
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-include $(top_srcdir)/build/autotools/Makefile.am.gitignore
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160
doc/cookbook/examples/events-pointer-motion-scribbler.c
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160
doc/cookbook/examples/events-pointer-motion-scribbler.c
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@ -0,0 +1,160 @@
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/*
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* Simple scribble application: move mouse over the dark yellow
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* rectangle to draw brighter yellow lines
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*/
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#include <clutter/clutter.h>
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static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
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static const ClutterColor actor_color = { 0xaa, 0x99, 0x00, 0xff };
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typedef struct {
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ClutterPath *path;
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CoglPath *cogl_path;
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} Context;
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static void
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convert_clutter_path_node_to_cogl_path (const ClutterPathNode *node,
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gpointer data)
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{
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g_return_if_fail (node != NULL);
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ClutterKnot knot;
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switch (node->type)
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{
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case CLUTTER_PATH_MOVE_TO:
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knot = node->points[0];
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cogl_path_move_to (knot.x, knot.y);
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g_debug ("move to %d, %d", knot.x, knot.y);
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break;
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case CLUTTER_PATH_LINE_TO:
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knot = node->points[0];
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cogl_path_line_to (knot.x, knot.y);
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g_debug ("line to %d, %d", knot.x, knot.y);
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break;
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default:
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break;
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}
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}
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static void
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_paint_cb (ClutterActor *actor,
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gpointer user_data)
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{
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Context *context = (Context *)user_data;
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cogl_set_source_color4ub (255, 255, 0, 255);
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cogl_set_path (context->cogl_path);
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clutter_path_foreach (context->path, convert_clutter_path_node_to_cogl_path, NULL);
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cogl_path_stroke_preserve ();
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clutter_path_clear (context->path);
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context->cogl_path = cogl_get_path ();
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g_signal_stop_emission_by_name (actor, "paint");
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}
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static gboolean
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_motion_cb (ClutterActor *actor,
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ClutterEvent *event,
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gpointer user_data)
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{
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ClutterMotionEvent *motion_event = (ClutterMotionEvent *)event;
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Context *context = (Context *)user_data;
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gfloat x, y;
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clutter_actor_transform_stage_point (actor, motion_event->x, motion_event->y, &x, &y);
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g_debug ("motion; x %f, y %f", x, y);
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clutter_path_add_line_to (context->path, x, y);
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clutter_actor_queue_redraw (actor);
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return TRUE;
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}
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static gboolean
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_enter_cb (ClutterActor *actor,
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ClutterEvent *event,
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gpointer user_data)
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{
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ClutterCrossingEvent *cross_event = (ClutterCrossingEvent *)event;
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Context *context = (Context *)user_data;
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gfloat x, y;
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clutter_actor_transform_stage_point (actor, cross_event->x, cross_event->y, &x, &y);
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g_debug ("enter; x %f, y %f", x, y);
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clutter_path_add_move_to (context->path, x, y);
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clutter_actor_queue_redraw (actor);
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return TRUE;
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}
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int
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main (int argc, char *argv[])
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{
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Context *context = g_new0 (Context, 1);
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ClutterActor *stage;
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ClutterActor *rect;
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ClutterActor *canvas;
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clutter_init (&argc, &argv);
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context->path = clutter_path_new ();
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cogl_path_new ();
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context->cogl_path = cogl_get_path ();
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stage = clutter_stage_get_default ();
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clutter_actor_set_size (stage, 400, 400);
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clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
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rect = clutter_rectangle_new_with_color (&actor_color);
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clutter_actor_set_size (rect, 300, 300);
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clutter_actor_add_constraint (rect, clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0.5));
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clutter_actor_add_constraint (rect, clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.5));
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clutter_container_add_actor (CLUTTER_CONTAINER (stage), rect);
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canvas = clutter_texture_new ();
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clutter_actor_set_size (canvas, 300, 300);
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clutter_actor_add_constraint (canvas, clutter_align_constraint_new (rect, CLUTTER_ALIGN_X_AXIS, 0.0));
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clutter_actor_add_constraint (canvas, clutter_align_constraint_new (rect, CLUTTER_ALIGN_Y_AXIS, 0.0));
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clutter_actor_set_reactive (canvas, TRUE);
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clutter_container_add_actor (CLUTTER_CONTAINER (stage), canvas);
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clutter_actor_raise_top (canvas);
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g_signal_connect (canvas,
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"motion-event",
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G_CALLBACK (_motion_cb),
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context);
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g_signal_connect (canvas,
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"enter-event",
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G_CALLBACK (_enter_cb),
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context);
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g_signal_connect (canvas,
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"paint",
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G_CALLBACK (_paint_cb),
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context);
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clutter_actor_show (stage);
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clutter_main ();
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g_object_unref (context->path);
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g_free (context);
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return 0;
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}
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