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
|
/*
* Pretty cairo flower hack.
*/
#include <clutter/clutter.h>
#include "clutter-cairo.h"
#include <unistd.h> /* for sleep(), used for screenshots */
#include <stdlib.h>
#include "math.h"
#define PETAL_MIN 20
#define PETAL_VAR 40
#define N_FLOWERS 40 /* reduce if you have a small card */
typedef struct Flower
{
ClutterActor *ctex;
gint x,y,rot,v,rv;
}
Flower;
ClutterActor*
make_flower_actor (void)
{
/* No science here, just a hack from toying */
gint i, j;
double colors[] = {
0.71, 0.81, 0.83,
1.0, 0.78, 0.57,
0.64, 0.30, 0.35,
0.73, 0.40, 0.39,
0.91, 0.56, 0.64,
0.70, 0.47, 0.45,
0.92, 0.75, 0.60,
0.82, 0.86, 0.85,
0.51, 0.56, 0.67,
1.0, 0.79, 0.58,
};
gint size;
gint petal_size;
gint n_groups; /* Num groups of petals 1-3 */
gint n_petals; /* num of petals 4 - 8 */
gint pm1, pm2;
gint idx, last_idx = -1;
ClutterActor *ctex;
cairo_t *cr;
petal_size = PETAL_MIN + rand() % PETAL_VAR;
size = petal_size * 8;
n_groups = rand() % 3 + 1;
ctex = clutter_cairo_new (size, size);
cr = clutter_cairo_create (CLUTTER_CAIRO(ctex));
cairo_set_tolerance (cr, 0.1);
/* Clear */
cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
cairo_paint(cr);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
cairo_translate(cr, size/2, size/2);
for (i=0; i<n_groups; i++)
{
n_petals = rand() % 5 + 4;
cairo_save (cr);
cairo_rotate (cr, rand() % 6);
do {
idx = (rand() % (sizeof (colors) / sizeof (double) / 3)) * 3;
} while (idx == last_idx);
cairo_set_source_rgba (cr, colors[idx], colors[idx+1],
colors[idx+2], 0.5);
last_idx = idx;
/* some bezier randomness */
pm1 = rand() % 20;
pm2 = rand() % 4;
for (j=1; j<n_petals+1; j++)
{
cairo_save (cr);
cairo_rotate (cr, ((2*M_PI)/n_petals)*j);
/* Petals are made up beziers */
cairo_new_path (cr);
cairo_move_to (cr, 0, 0);
cairo_rel_curve_to (cr,
petal_size, petal_size,
(pm2+2)*petal_size, petal_size,
(2*petal_size) + pm1, 0);
cairo_rel_curve_to (cr,
0 + (pm2*petal_size), -petal_size,
-petal_size, -petal_size,
-((2*petal_size) + pm1), 0);
cairo_close_path (cr);
cairo_fill (cr);
cairo_restore (cr);
}
petal_size -= rand() % (size/8);
cairo_restore (cr);
}
/* Finally draw flower center */
do {
idx = (rand() % (sizeof (colors) / sizeof (double) / 3)) * 3;
} while (idx == last_idx);
if (petal_size < 0)
petal_size = rand() % 10;
cairo_set_source_rgba (cr, colors[idx], colors[idx+1], colors[idx+2], 0.5);
cairo_arc(cr, 0, 0, petal_size, 0, M_PI * 2);
cairo_fill(cr);
cairo_destroy(cr);
return ctex;
}
gboolean
tick (gpointer data)
{
Flower **flowers = (Flower**)data;
gint i = 0;
for (i=0; i< N_FLOWERS; i++)
{
flowers[i]->y += flowers[i]->v;
flowers[i]->rot += flowers[i]->rv;
if (flowers[i]->y > (gint)clutter_actor_get_height
(clutter_stage_get_default ()))
flowers[i]->y = -clutter_actor_get_height (flowers[i]->ctex);
clutter_actor_set_position (flowers[i]->ctex,
flowers[i]->x, flowers[i]->y);
clutter_actor_set_rotation (flowers[i]->ctex,
CLUTTER_Z_AXIS,
flowers[i]->rot,
clutter_actor_get_width (flowers[i]->ctex)/2,
clutter_actor_get_height (flowers[i]->ctex)/2,
0);
}
return TRUE;
}
void foo(void) { g_usleep(10000000); }
int
main (int argc, char **argv)
{
int i;
ClutterActor *stage;
ClutterColor stage_color = { 0x0, 0x0, 0x0, 0xff };
Flower *flowers[N_FLOWERS];
srand(time(NULL));
clutter_init (&argc, &argv);
stage = clutter_stage_get_default ();
clutter_stage_set_color (CLUTTER_STAGE (stage),
&stage_color);
g_object_set(stage, "fullscreen", TRUE, NULL);
for (i=0; i< N_FLOWERS; i++)
{
flowers[i] = g_new0(Flower, 1);
flowers[i]->ctex = make_flower_actor();
flowers[i]->x = rand() % clutter_actor_get_width(stage)
- (PETAL_MIN+PETAL_VAR)*2;
flowers[i]->y = rand() % clutter_actor_get_height(stage);
flowers[i]->rv = rand() % 5 + 1;
flowers[i]->v = rand() % 10 + 2;
clutter_group_add (CLUTTER_GROUP(stage), flowers[i]->ctex);
clutter_actor_set_position (flowers[i]->ctex,
flowers[i]->x, flowers[i]->y);
}
g_timeout_add (50, tick, flowers);
clutter_actor_show_all (CLUTTER_ACTOR (stage));
g_signal_connect (stage, "key-press-event",
G_CALLBACK (clutter_main_quit),
NULL);
clutter_main();
return 1;
}
|
