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#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include <mouse.h>
#include <keyboard.h>
#define HZ2MS(hz) (1000/(hz))
enum {
Stop,
Pause,
Run,
};
typedef struct Stopwatch Stopwatch;
struct Stopwatch
{
uvlong elapsed; /* in ms */
char hms[4][4];
int state;
void (*start)(Stopwatch*);
void (*stop)(Stopwatch*);
void (*pause)(Stopwatch*);
void (*update)(Stopwatch*, uvlong);
void (*draw)(Stopwatch*, Image*, Point, double);
};
char deffont[] = "/lib/font/bit/lucida/unicode.32.font";
Image *screenb;
Keyboardctl *kc;
Mousectl *mc;
Channel *drawc;
Stopwatch *chrono;
uvlong nanosec(void);
static void
stopwatch_start(Stopwatch *self)
{
if(self->state == Stop)
self->elapsed = 0;
self->state = Run;
}
static void
stopwatch_stop(Stopwatch *self)
{
if(self->state == Run)
self->state = Stop;
}
static void
stopwatch_pause(Stopwatch *self)
{
if(self->state == Run)
self->state = Pause;
}
static void
stopwatch_update(Stopwatch *self, uvlong dt)
{
int HMS[4], i;
double t;
self->elapsed += dt;
t = self->elapsed;
t /= 60*60*1000; HMS[0] = t; t -= HMS[0];
t *= 60; HMS[1] = t; t -= HMS[1];
t *= 60; HMS[2] = t; t -= HMS[2];
t *= 1000; HMS[3] = t;
for(i = 0; i < nelem(HMS); i++)
snprint(self->hms[i], sizeof self->hms[i], i < 3? "%02d": "%03d", HMS[i]);
}
static void
stopwatch_draw(Stopwatch *self, Image *dst, Point dp, double scale)
{
USED(scale);
int i;
for(i = 0; i < nelem(self->hms); i++){
if(i > 0)
dp = string(dst, dp, display->white, ZP, font, i < 3? ":": ".");
dp = string(dst, dp, display->white, ZP, font, self->hms[i]);
}
}
void
timer(void *arg)
{
Stopwatch *s;
uvlong t0, t1;
uvlong dt; /* in ms */
threadsetname("tic-tac");
s = arg;
t0 = nanosec();
for(;;){
t1 = nanosec();
dt = (t1 - t0)/1000000ULL;
if(s->state == Run){
s->update(s, dt);
nbsend(drawc, nil);
}
t0 = t1;
sleep(HZ2MS(13));
}
}
Stopwatch *
mkstopwatch(void)
{
Stopwatch *s;
s = malloc(sizeof *s);
if(s == nil)
sysfatal("malloc: %r");
memset(s, 0, sizeof *s);
s->start = stopwatch_start;
s->stop = stopwatch_stop;
s->pause = stopwatch_pause;
s->update = stopwatch_update;
s->draw = stopwatch_draw;
proccreate(timer, s, mainstacksize);
return s;
}
void
rmstopwatch(Stopwatch *s)
{
free(s);
}
void
initscreenb(void)
{
if(screenb != nil)
freeimage(screenb);
screenb = allocimage(display, rectsubpt(screen->r, screen->r.min), screen->chan, 0, DNofill);
if(screenb == nil)
sysfatal("allocimage: %r");
}
void
redraw(void)
{
draw(screenb, screenb->r, display->black, nil, ZP);
chrono->draw(chrono, screenb, Pt(10, 10), 1);
draw(screen, screen->r, screenb, nil, ZP);
flushimage(display, 1);
}
void
resize(void)
{
if(getwindow(display, Refnone) < 0)
sysfatal("resize failed");
initscreenb();
nbsend(drawc, nil);
}
void
mouse(Mousectl *)
{
}
void
key(Rune r)
{
switch(r){
case Kdel:
threadexitsall(nil);
case Kesc:
if(chrono->state == Run)
chrono->pause(chrono);
else if(chrono->state == Pause)
chrono->start(chrono);
break;
case ' ':
if(chrono->state == Run)
chrono->stop(chrono);
else if(chrono->state == Stop)
chrono->start(chrono);
break;
}
}
void
usage(void)
{
fprint(2, "usage: %s\n", argv0);
exits("usage");
}
void
threadmain(int argc, char *argv[])
{
Rune r;
ARGBEGIN{
default: usage();
}ARGEND;
if(initdraw(nil, deffont, "chrono") < 0)
sysfatal("initdraw: %r");
if((mc = initmouse(nil, screen)) == nil)
sysfatal("initmouse: %r");
if((kc = initkeyboard(nil)) == nil)
sysfatal("initkeyboard: %r");
initscreenb();
drawc = chancreate(sizeof(void*), 1);
nbsend(drawc, nil);
chrono = mkstopwatch();
enum { MOUSE, RESIZE, KEYS, DRAW, NONE };
Alt a[] = {
[MOUSE] {mc->c, &mc->Mouse, CHANRCV},
[RESIZE] {mc->resizec, nil, CHANRCV},
[KEYS] {kc->c, &r, CHANRCV},
[DRAW] {drawc, nil, CHANRCV},
[NONE] {nil, nil, CHANEND}
};
for(;;)
switch(alt(a)){
case MOUSE:
mouse(mc);
break;
case RESIZE:
resize();
break;
case KEYS:
key(r);
break;
case DRAW:
redraw();
break;
default:
sysfatal("main loop interrupted");
}
}
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