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
|
#include <u.h>
#include <libc.h>
#include <draw.h>
enum { SEC = 1000 };
enum {
Cred,
Cgrn,
Cbg,
Cgx,
Cend
};
Image *col[Cend];
int dx, dy;
void *
emalloc(ulong n)
{
void *p;
p = malloc(n);
if(p == nil)
sysfatal("malloc: %r");
memset(p, 0, n);
setmalloctag(p, getcallerpc(&n));
return p;
}
Image *
eallocimage(Display *d, Rectangle r, ulong chan, int repl, ulong col)
{
Image *i;
i = allocimage(d, r, chan, repl, col);
if(i == nil)
sysfatal("allocimage: %r");
return i;
}
void
usage(void)
{
fprint(2, "usage: spranimate\n");
exits("usage");
}
void
main(int argc, char *argv[])
{
Image *spnr, *spnmsk;
double θ;
uchar *gx;
int ds, i, x, y, inc, frame;
ARGBEGIN{
default: usage();
}ARGEND;
if(initdraw(nil, nil, "spranimate") < 0)
sysfatal("initdraw: %r");
dx = Dx(screen->r), dy = Dy(screen->r);
col[Cred] = eallocimage(display, Rect(0, 0, 1, 1), RGB24, 1, DRed);
col[Cgrn] = eallocimage(display, Rect(0, 0, 1, 1), RGB24, 1, DGreen);
col[Cbg] = eallocimage(display, Rect(0, 0, 1, 1), RGB24, 1, DNofill);
ds = dx > dy ? dy : dx;
spnr = eallocimage(display, Rect(0, 0, ds*60, ds), RGBA32, 0, DTransparent);
spnmsk = eallocimage(display, Rect(0, 0, ds, ds), GREY1, 0, DWhite);
col[Cgx] = eallocimage(display, Rect(0, 0, 60, 1), GREY8, 1, DNofill);
gx = emalloc(60);
for(i = 0; i < 60; i++)
gx[i] = 255.0 * i/(60-1);
for(i = 0; i < 60; i++){
θ = 2*PI * i/60;
x = (ds/2 - 5) * cos(θ);
y = (ds/2 - 5) * sin(θ);
line(spnr, Pt(x + ds/2 + ds*i, y + ds/2), Pt(-x + ds/2 + ds*i, -y + ds/2), Endarrow, Endsquare, 1, display->black, ZP);
}
loadimage(col[Cgx], col[Cgx]->r, gx, dx);
x = inc = frame = 0;
for(;;){
draw(col[Cbg], col[Cbg]->r, col[Cred], nil, ZP);
if(x == 0)
inc = 1;
else if(x == 60-1)
inc = -1;
x += inc;
gendraw(col[Cbg], col[Cbg]->r, col[Cgrn], ZP, col[Cgx], Pt(x, 0));
draw(screen, screen->r, col[Cbg], nil, ZP);
frame = (frame+1) % 60;
gendraw(screen, screen->r, spnr, Pt(frame*ds, 0), spnmsk, ZP);
flushimage(display, 1);
sleep(SEC/60);
}
}
|
