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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
#include <stdlib.h>
#include <clutter/clutter.h>
#define RECT_SIZE 128
#define H_PADDING 32
#define V_PADDING 32
enum
{
NorthWest, North, NorthEast,
West, Center, East,
SouthWest, South, SouthEast,
N_RECTS
};
static ClutterActor *rects[N_RECTS] = { NULL, };
static const gchar *colors[N_RECTS] = {
"#8ae234", "#73d216", "#4e9a06",
"#729fcf", "#3465a4", "#204a87",
"#ef2929", "#cc0000", "#a40000"
};
static const gchar *names[N_RECTS] = {
"North West", "North", "North East",
"West", "Center", "East",
"South West", "South", "South East"
};
static const gchar *desaturare_glsl_shader =
"uniform sampler2D tex;\n"
"uniform float factor;\n"
"\n"
"vec3 desaturate (const vec3 color, const float desaturation)\n"
"{\n"
" const vec3 gray_conv = vec3 (0.299, 0.587, 0.114);\n"
" vec3 gray = vec3 (dot (gray_conv, color));\n"
" return vec3 (mix (color.rgb, gray, desaturation));\n"
"}\n"
"\n"
"void main ()\n"
"{\n"
" vec4 color = cogl_color_in * texture2D (tex, vec2 (cogl_tex_coord_in[0].xy));\n"
" color.rgb = desaturate (color.rgb, factor);\n"
" cogl_color_out = color;\n"
"}\n";
static gboolean is_expanded = FALSE;
static gboolean
on_button_release (ClutterActor *actor,
ClutterEvent *event,
gpointer data G_GNUC_UNUSED)
{
if (!is_expanded)
{
gfloat north_offset, south_offset;
gfloat west_offset, east_offset;
/* expand the 8 rectangles by animating the offset of the
* bind constraints
*/
north_offset = (clutter_actor_get_height (rects[Center]) + V_PADDING)
* -1.0f;
south_offset = (clutter_actor_get_height (rects[Center]) + V_PADDING);
west_offset = (clutter_actor_get_width (rects[Center]) + H_PADDING)
* -1.0f;
east_offset = (clutter_actor_get_width (rects[Center]) + H_PADDING);
clutter_actor_animate (rects[NorthWest], CLUTTER_EASE_OUT_EXPO, 500,
"opacity", 255,
"@constraints.x-bind.offset", west_offset,
"@constraints.y-bind.offset", north_offset,
"reactive", TRUE,
NULL);
clutter_actor_animate (rects[North], CLUTTER_EASE_OUT_EXPO, 500,
"opacity", 255,
"@constraints.y-bind.offset", north_offset,
"reactive", TRUE,
NULL);
clutter_actor_animate (rects[NorthEast], CLUTTER_EASE_OUT_EXPO, 500,
"opacity", 255,
"@constraints.x-bind.offset", east_offset,
"@constraints.y-bind.offset", north_offset,
"reactive", TRUE,
NULL);
clutter_actor_animate (rects[West], CLUTTER_EASE_OUT_EXPO, 500,
"opacity", 255,
"@constraints.x-bind.offset", west_offset,
"reactive", TRUE,
NULL);
/* turn on the desaturation effect and set the center
* rectangle not reactive
*/
clutter_actor_animate (rects[Center], CLUTTER_LINEAR, 500,
"@effects.desaturate.enabled", TRUE,
"reactive", FALSE,
NULL);
clutter_actor_animate (rects[East], CLUTTER_EASE_OUT_EXPO, 500,
"opacity", 255,
"@constraints.x-bind.offset", east_offset,
"reactive", TRUE,
NULL);
clutter_actor_animate (rects[SouthWest], CLUTTER_EASE_OUT_EXPO, 500,
"opacity", 255,
"@constraints.x-bind.offset", west_offset,
"@constraints.y-bind.offset", south_offset,
"reactive", TRUE,
NULL);
clutter_actor_animate (rects[South], CLUTTER_EASE_OUT_EXPO, 500,
"opacity", 255,
"@constraints.y-bind.offset", south_offset,
"reactive", TRUE,
NULL);
clutter_actor_animate (rects[SouthEast], CLUTTER_EASE_OUT_EXPO, 500,
"opacity", 255,
"@constraints.x-bind.offset", east_offset,
"@constraints.y-bind.offset", south_offset,
"reactive", TRUE,
NULL);
}
else
{
gint i;
clutter_actor_animate (rects[Center], CLUTTER_LINEAR, 500,
"@effects.desaturate.enabled", FALSE,
"reactive", TRUE,
NULL);
for (i = NorthWest; i < N_RECTS; i++)
{
if (i == Center)
continue;
/* put the 8 rectangles back into their initial state */
clutter_actor_animate (rects[i], CLUTTER_EASE_OUT_EXPO, 500,
"opacity", 0,
"@constraints.x-bind.offset", 0.0f,
"@constraints.y-bind.offset", 0.0f,
"reactive", FALSE,
NULL);
}
}
is_expanded = !is_expanded;
g_print ("Selected: [%s]\n", clutter_actor_get_name (actor));
return TRUE;
}
G_MODULE_EXPORT const char *
test_bind_constraint_describe (void)
{
return "Demonstrate the usage of ClutterBindConstraint";
}
G_MODULE_EXPORT int
test_bind_constraint_main (int argc, char *argv[])
{
ClutterActor *stage, *rect;
ClutterConstraint *constraint;
ClutterEffect *effect;
ClutterColor rect_color;
gint i;
if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
return 1;
stage = clutter_stage_new ();
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
clutter_stage_set_title (CLUTTER_STAGE (stage), "Constraints");
clutter_stage_set_user_resizable (CLUTTER_STAGE (stage), TRUE);
clutter_actor_set_size (stage, 800, 600);
/* main rectangle */
clutter_color_from_string (&rect_color, "#3465a4");
rect = clutter_actor_new ();
g_signal_connect (rect, "button-release-event",
G_CALLBACK (on_button_release),
NULL);
clutter_actor_set_background_color (rect, &rect_color);
clutter_actor_set_size (rect, RECT_SIZE, RECT_SIZE);
clutter_actor_set_reactive (rect, TRUE);
clutter_actor_set_name (rect, names[Center]);
clutter_actor_add_child (stage, rect);
/* align the center rectangle to the center of the stage */
constraint = clutter_align_constraint_new (stage, CLUTTER_ALIGN_BOTH, 0.5);
clutter_actor_add_constraint_with_name (rect, "align", constraint);
/* this is the equivalent of the DesaturateEffect; we cannot animate
* the factor because the animation API only understands GObject
* properties; so we use the ActorMeta:enabled property to toggle
* the shader
*/
effect = clutter_shader_effect_new (CLUTTER_FRAGMENT_SHADER);
clutter_shader_effect_set_shader_source (CLUTTER_SHADER_EFFECT (effect),
desaturare_glsl_shader);
clutter_shader_effect_set_uniform (CLUTTER_SHADER_EFFECT (effect),
"tex", G_TYPE_INT, 1, 0);
clutter_shader_effect_set_uniform (CLUTTER_SHADER_EFFECT (effect),
"factor", G_TYPE_FLOAT, 1, 0.66);
clutter_actor_meta_set_enabled (CLUTTER_ACTOR_META (effect), FALSE);
clutter_actor_add_effect_with_name (rect, "desaturate", effect);
rects[Center] = rect;
/* build the other rectangles, and bind their position and size
* to the center rectangle. we are going to animate the offset
* of the BindConstraints
*/
for (i = 0; i < N_RECTS; i++)
{
if (i == Center)
continue;
clutter_color_from_string (&rect_color, colors[i]);
rect = clutter_actor_new ();
clutter_actor_set_background_color (rect, &rect_color);
clutter_actor_set_opacity (rect, 0);
clutter_actor_set_name (rect, names[i]);
clutter_actor_add_child (stage, rect);
constraint = clutter_bind_constraint_new (rects[Center], CLUTTER_BIND_X, 0.0);
clutter_actor_add_constraint_with_name (rect, "x-bind", constraint);
constraint = clutter_bind_constraint_new (rects[Center], CLUTTER_BIND_Y, 0.0);
clutter_actor_add_constraint_with_name (rect, "y-bind", constraint);
constraint = clutter_bind_constraint_new (rects[Center], CLUTTER_BIND_SIZE, 0.0);
clutter_actor_add_constraint_with_name (rect, "size-bind", constraint);
g_signal_connect (rect, "button-release-event",
G_CALLBACK (on_button_release),
NULL);
rects[i] = rect;
}
clutter_actor_show (stage);
clutter_main ();
return EXIT_SUCCESS;
}
|
