libclutter-1.0-doc 1.20.0-1 / usr / share / clutter-1.0 / cookbook / examples / events-pointer-motion-scribbler.c

This file is indexed.

/usr/share/clutter-1.0/cookbook/examples/events-pointer-motion-scribbler.c is in libclutter-1.0-doc 1.20.0-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below. 

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
/*
 * 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)
{
  ClutterKnot 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 %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
_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;
}

APT Browse - Built by Thomas Orozco.