#include<stdlib.h>
#include<X11/Xlib.h>

#include "vroot.h"

#define NCOLORS 3

main ()
{
  Display *dpy;
  Window root;
  XWindowAttributes wa;
  GC g;

  Font f;

  char *colors[NCOLORS]={"red", "green", "blue"};
  XColor xcolors[NCOLORS];
  XColor xc, sc;
  int c;


  /* open the display (connect to the X server) */
  dpy = XOpenDisplay (getenv ("DISPLAY"));


  /* get the root window */
  root = DefaultRootWindow (dpy);


  /* get attributes of the root window */
  XGetWindowAttributes(dpy, root, &wa);


  /* create a GC for drawing in the window */
  g = XCreateGC (dpy, root, 0, NULL);


  /* load a font */
  f=XLoadFont(dpy, "-*-helvetica-bold-r-*-*-20-*-*-*-*-*-*-*");
  XSetFont(dpy, g, f);


  /* allocate colors */
  for(c=0; c<NCOLORS; c++) {
    XAllocNamedColor(dpy,
                     DefaultColormapOfScreen(DefaultScreenOfDisplay(dpy)),
                     colors[c],
                     &sc, &xc);
    xcolors[c]=sc;
  }


  /* draw something */
  while (1)
    {
      /* set a random foreground color */
      XSetForeground(dpy, g, xcolors[random()%NCOLORS].pixel);

      
      /* draw a string */
      XDrawString(dpy, root, g, random()%wa.width, random()%wa.height,
                  "Ooops!", strlen("Ooops!") );


      /* once in a while, clear all */
      if( random()%500<1 )
        XClearWindow(dpy, root);


      /* flush changes and sleep */
      XFlush(dpy);
      usleep (10);
    }


  XCloseDisplay (dpy);
}