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#include <u.h>
#include <libc.h>
#include <draw.h>
#include <event.h>
enum {
SEC = 1000
};
int vfd, volume;
int ismixfs;
Image *knob;
Image *back;
Image *rim;
Point
volumept(Point c, int volume, int r)
{
double rad;
rad = (double)(volume*3.0+30) * PI/180.0;
c.x -= sin(rad) * r;
c.y += cos(rad) * r;
return c;
}
void
redraw(void)
{
Point c;
c = divpt(addpt(screen->r.min, screen->r.max), 2);
draw(screen, screen->r, back, nil, ZP);
line(screen, volumept(c, 0, 45), volumept(c, 0, 40), 0, 0, 1, display->black, ZP);
line(screen, volumept(c, 100, 45), volumept(c, 100, 40), 0, 0, 1, display->black, ZP);
ellipse(screen, c, 40, 40, 1, rim, ZP);
fillellipse(screen, volumept(c, volume, 30), 3, 3, knob, ZP);
}
void
update(void)
{
char buf[256], *s;
int n;
if((n = pread(vfd, buf, sizeof(buf)-1, 0)) <= 0)
sysfatal("pread: %r");
buf[n] = 0;
strtok(buf, " ");
s = strtok(nil, " ");
volume = strtol(s, nil, 0);
}
void
eresized(int new)
{
if(new && getwindow(display, Refnone) < 0)
fprint(2, "can't reattach to window");
redraw();
}
void
main()
{
Mouse m;
Event e;
Point p;
double rad;
int Etimer, key, d;
char buf[3];
vfd = open("/dev/volume", ORDWR);
if(vfd < 0)
sysfatal("open: %r");
read(vfd, buf, sizeof buf);
ismixfs = strncmp(buf, "mix", 3) == 0;
update();
if(initdraw(0, 0, "volume") < 0)
sysfatal("initdraw: %r");
back = allocimagemix(display, 0x88FF88FF, DWhite);
knob = allocimage(display, Rect(0,0,1,1), CMAP8, 1, 0x008800FF);
rim = allocimage(display, Rect(0,0,1,1), CMAP8, 1, 0x004400FF);
einit(Emouse);
Etimer = etimer(0, 2*SEC);
redraw();
for(;;){
key = event(&e);
if(key == Emouse){
m = e.mouse;
if(m.buttons & 1){
p = subpt(m.xy, divpt(addpt(screen->r.min, screen->r.max), 2));
rad = atan2(-p.x, p.y);
d = rad * 180.0/PI;
if(d < 0)
d += 360;
d *= 160.0/360.0;
if(d < 30)
d = 0;
else if(d > 130)
d = 100;
else
d -= 30;
volume = d;
fprint(vfd, "%s%d", ismixfs? "mix " : "", volume);
redraw();
}
}else if(key == Etimer){
update();
redraw();
}
}
}
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