plan9us-hg/clock.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <draw.h>
   4 #include <event.h>
   5
   6 Image *hrhand, *minhand;
   7 Image *dots, *back;
   8
   9 Point
  10 circlept(Point c, int r, int degrees)
  11 {
  12         double rad;
  13         rad = (double) degrees * PI/180.0;
  14         c.x += cos(rad)*r;
  15         c.y -= sin(rad)*r;
  16         return c;
  17 }
  18
  19 void
  20 redraw(Image *screen)
  21 {
  22         static int tm, ntm;
  23         static Rectangle r;
  24         static Point c;
  25         static int rad;
  26         int i;
  27         int anghr, angmin;
  28         static Tm tms;
  29         static Tm ntms;
  30
  31         ntm = time(0);
  32         if(ntm == tm && eqrect(screen->r, r))
  33                 return;
  34
  35         ntms = *localtime(ntm);
  36         anghr = 90-(ntms.hour*5 + ntms.min/12)*6;
  37         angmin = 90-ntms.min*6;
  38         tm = ntm;
  39         tms = ntms;
  40         r = screen->r;
  41         c = divpt(addpt(r.min, r.max), 2);
  42         rad = Dx(r) < Dy(r) ? Dx(r) : Dy(r);
  43         rad /= 2;
  44         rad -= 8;
  45
  46         draw(screen, screen->r, back, nil, ZP);
  47         for(i=0; i<12; i++)
  48                 fillellipse(screen, circlept(c, rad, i*(360/12)), 2, 2, dots, ZP);
  49
  50         line(screen, c, circlept(c, (rad*3)/4, angmin), 0, 0, 1, minhand, ZP);
  51         line(screen, c, circlept(c, rad/2, anghr), 0, 0, 1, hrhand, ZP);
  52
  53         flushimage(display, 1);
  54 }
  55
  56 void
  57 eresized(int new)
  58 {
  59         if(new && getwindow(display, Refnone) < 0)
  60                 fprint(2,"can't reattach to window");
  61         redraw(screen);
  62 }
  63
  64 #ifdef PLAN9PORT
  65 void
  66 usage(void)
  67 {
  68         fprint(2, "usage: clock [-W winsize]\n");
  69         exits("usage");
  70 }
  71 #endif
  72
  73 void
  74 main(int argc, char *argv[])
  75 {
  76         Event e;
  77         Mouse m;
  78         Menu menu;
  79         char *mstr[] = {"exit", 0};
  80         int key, timer;
  81
  82 #ifdef PLAN9PORT
  83         ARGBEGIN{
  84         case 'W':
  85                 winsize = EARGF(usage());
  86                 break;
  87         default:
  88                 usage();
  89         }ARGEND
  90 #endif
  91
  92         initdraw(0,0,"clock");
  93         back = allocimagemix(display, DPalebluegreen, DWhite);
  94
  95         hrhand = allocimage(display, Rect(0,0,1,1), CMAP8, 1, DDarkblue);
  96         minhand = allocimage(display, Rect(0,0,1,1), CMAP8, 1, DPaleblue);
  97         dots = allocimage(display, Rect(0,0,1,1), CMAP8, 1, DBlue);
  98         redraw(screen);
  99
 100         einit(Emouse);
 101         timer = etimer(0, 30*1000);
 102
 103         menu.item = mstr;
 104         menu.lasthit = 0;
 105         for(;;) {
 106                 key = event(&e);
 107                 if(key == Emouse) {
 108                         m = e.mouse;
 109                         if(m.buttons & 4) {
 110                                 if(emenuhit(3, &m, &menu) == 0)
 111                                         exits(0);
 112                         }
 113                 } else if(key == timer) {
 114                         redraw(screen);
 115                 }
 116         }
 117 }