#include <u.h>#include <libc.h>#include <draw.h>#include <event.h> Image *hrhand, *minhand;Image *dots, *back; Pointcirclept(Point c, int r, int degrees){	double rad;	rad = (double) degrees * PI/180.0;	c.x += cos(rad)*r;	c.y -= sin(rad)*r;	return c;} voidredraw(Image *screen){	static int tm, ntm;	static Rectangle r;	static Point c;	static int rad;	static Image *im;	int i;	int anghr, angmin;	static Tm tms;	static Tm ntms; 	ntm = time(0);	if(ntm == tm && eqrect(screen->r, r))		return; 	ntms = *localtime(ntm);	anghr = 90-(ntms.hour*5 + ntms.min/12)*6;	angmin = 90-ntms.min*6;	tm = ntm;	tms = ntms;	r = screen->r;	c = divpt(addpt(r.min, r.max), 2);	rad = Dx(r) < Dy(r) ? Dx(r) : Dy(r);	rad /= 2;	rad -= 8; 	draw(screen, screen->r, back, nil, ZP);	for(i=0; i<12; i++)		fillellipse(screen, circlept(c, rad, i*(360/12)), 2, 2, dots, ZP); 	line(screen, c, circlept(c, (rad*3)/4, angmin), 0, 0, 1, minhand, ZP);	line(screen, c, circlept(c, rad/2, anghr), 0, 0, 1, hrhand, ZP); 	flushimage(display, 1);} voideresized(int new){	if(new && getwindow(display, Refnone) < 0)		fprint(2,"can't reattach to window");	redraw(screen);} voidmain(int, char**){	Event e;	Mouse m;	Menu menu;	char *mstr[] = {"exit", 0};	int key, timer;	int t; 	if (initdraw(0, 0, "clock") < 0)		sysfatal("initdraw failed");	back = allocimagemix(display, DPalebluegreen, DWhite); 	hrhand = allocimage(display, Rect(0,0,1,1), CMAP8, 1, DDarkblue);	minhand = allocimage(display, Rect(0,0,1,1), CMAP8, 1, DPaleblue);	dots = allocimage(display, Rect(0,0,1,1), CMAP8, 1, DBlue);	redraw(screen); 	einit(Emouse);	t = (30*1000);	timer = etimer(0, t); 	menu.item = mstr;	menu.lasthit = 0;	for(;;) {		key = event(&e);		if(key == Emouse) {			m = e.mouse;			if(m.buttons & 4) {				if(emenuhit(3, &m, &menu) == 0)					exits(0);			}		} else if(key == timer) {			redraw(screen);		}	}	}