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
|
#include <stdlib.h>
#include <gmodule.h>
#include <clutter/clutter.h>
#define PATH_DESCRIPTION \
"M 0, 0 " \
"L 0, 300 " \
"L 300, 300 " \
"L 300, 0 " \
"L 0, 0"
static gboolean toggled = FALSE;
static gboolean
on_button_press (ClutterActor *actor,
const ClutterEvent *event,
gpointer dummy G_GNUC_UNUSED)
{
if (!toggled)
clutter_actor_animate (actor, CLUTTER_EASE_OUT_CUBIC, 500,
"@constraints.path.offset", 1.0,
NULL);
else
clutter_actor_animate (actor, CLUTTER_EASE_OUT_CUBIC, 500,
"@constraints.path.offset", 0.0,
NULL);
toggled = !toggled;
return TRUE;
}
static gchar *
node_to_string (const ClutterPathNode *node)
{
GString *buffer = g_string_sized_new (256);
gsize len = 0, i;
switch (node->type)
{
case CLUTTER_PATH_MOVE_TO:
g_string_append (buffer, "move-to ");
len = 1;
break;
case CLUTTER_PATH_LINE_TO:
g_string_append (buffer, "line-to ");
len = 1;
break;
case CLUTTER_PATH_CURVE_TO:
g_string_append (buffer, "curve-to ");
len = 3;
break;
case CLUTTER_PATH_CLOSE:
g_string_append (buffer, "close");
len = 0;
break;
default:
break;
}
for (i = 0; i < len; i++)
{
if (i == 0)
g_string_append (buffer, "[ ");
g_string_append_printf (buffer, "[ %d, %d ]",
node->points[i].x,
node->points[i].y);
if (i == len - 1)
g_string_append (buffer, " ]");
}
return g_string_free (buffer, FALSE);
}
static void
on_node_reached (ClutterPathConstraint *constraint,
ClutterActor *actor,
guint index_)
{
ClutterPath *path = clutter_path_constraint_get_path (constraint);
ClutterPathNode node;
gchar *str;
clutter_path_get_node (path, index_, &node);
str = node_to_string (&node);
g_print ("Node %d reached: %s\n", index_, str);
g_free (str);
}
G_MODULE_EXPORT int
test_path_constraint_main (int argc,
char *argv[])
{
ClutterActor *stage, *rect;
ClutterPath *path;
ClutterColor rect_color = { 0xcc, 0x00, 0x00, 0xff };
if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
return 1;
stage = clutter_stage_new ();
clutter_stage_set_title (CLUTTER_STAGE (stage), "Path Constraint");
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
path = clutter_path_new ();
clutter_path_set_description (path, PATH_DESCRIPTION);
rect = clutter_rectangle_new ();
clutter_rectangle_set_color (CLUTTER_RECTANGLE (rect), &rect_color);
clutter_actor_set_size (rect, 128, 128);
clutter_actor_set_reactive (rect, TRUE);
clutter_actor_add_constraint_with_name (rect, "path", clutter_path_constraint_new (path, 0.0));
clutter_container_add_actor (CLUTTER_CONTAINER (stage), rect);
g_signal_connect (rect, "button-press-event", G_CALLBACK (on_button_press), NULL);
g_signal_connect (clutter_actor_get_constraint (rect, "path"),
"node-reached",
G_CALLBACK (on_node_reached),
NULL);
clutter_actor_show (stage);
clutter_main ();
return EXIT_SUCCESS;
}
|
