/*_|_|   VESATEST.C   ( part 2 of 2 )
_|_|_|   A program to test vesa mode 103 (800x600x256).
_|_|_|   No guarantee or warrantee given or implied.
_|_|_|   PUBLIC DOMAIN   by Kurt Kuzba.  (8/24/1997)*/
void bresenham_line(int x, int y, int x2, int y2, int c)
{
   int i, steep = 0, sx, sy, dx, dy, e, ex, ey;
   dx = abs(x2 - x);
   sx = ((x2 - x) > 0) ? 1 : -1;
   dy = abs(y2 - y);
   sy = ((y2 - y) > 0) ? 1 : -1;
   if(dy > dx)
   {
      steep =  x;   x =  y;   y = steep;  /* swap  x and  y */
      steep = dx;  dx = dy;  dy = steep;  /* swap dx and dy */
      steep = sx;  sx = sy;  sy = steep;  /* swap sx and sy */
      steep = 1;
   }
   e = 2 * dy - dx;
   ex = dx << 1;
   ey = dy << 1;
   for(i = 0; i < dx; i++)
   {
      if(steep)
         plotdot(y, x, c);
      else
         plotdot(x, y, c);
      while(e >= 0)
      {
         y += sy;
         e -= ex;
      }
      x += sx;
      e += ey;
   }
   plotdot(x2, y2, c);
}
void test(void)
{
   LineEnds xy[3] = { 0,0, 0,0,  0,0, 0,0,  0,0, 0,0 };
   int loop, cc, cl, change, rad;
   xy[1].y[1] = rnd(2) + 2;   xy[1].x[1] = rnd(2) + 2;
   xy[2].x[0] = rnd(2) + 2;   xy[2].x[1] = rnd(2) + 2;
   xy[2].y[0] = rnd(2) + 2;   xy[2].y[1] = rnd(2) + 2;
   change = cc = cl = rad = 0;
   while(*((char far*)0x0041000aL) == *((char far*)0x0041000cL))
   {
      if(!change)
      {
         cl = rnd(255);   cc = rnd(255);   rad = rnd(80) + 20;
         for(loop = 0; loop < 30; loop++)
            bresenham_disc(rnd(799), rnd(599), rnd(20) + 20,
               rnd(255), rnd(30) + 10, rnd(40) + 10);
      }
      change = (change + 1) & 511;
      for(loop = 0; loop < 2; loop++)
      {
         if(xy[0].x[loop] < -11)    xy[2].x[loop] =  rnd(4) + 3;
         if(xy[0].x[loop] > 611)  xy[2].x[loop] = -(rnd(4) + 3);
         if(xy[0].y[loop] < -11)    xy[2].y[loop] =  rnd(4) + 3;
         if(xy[0].y[loop] > 811)  xy[2].y[loop] = -(rnd(4) + 3);
         xy[0].x[loop] += xy[2].x[loop];
         xy[0].y[loop] += xy[2].y[loop];
      }
      if(xy[1].x[0] < 1)     xy[1].x[1] =  rnd(4) + 3;
      if(xy[1].x[0] > 598)   xy[1].x[1] = -(rnd(4) + 3);
      if(xy[1].y[0] < 1)     xy[1].y[1] =  rnd(4) + 3;
      if(xy[1].y[0] > 798)   xy[1].y[1] = -(rnd(4) + 3);
      xy[1].x[0] += xy[1].x[1];
      xy[1].y[0] += xy[1].y[1];
      bresenham_line(xy[0].y[0], xy[0].x[0], xy[0].y[1],
         xy[0].x[1], cl);
      bresenham_circle(xy[1].y[0], xy[1].x[0], rad, cc);
   }
}
int main(void)
{
   time_t TM = time(NULL);
   srand((unsigned)TM);
   vesamode(0x103);
   test();
   getch();
   Vmode(0x03);
   return 0;
}
/*_|_|   end   VESATEST.C   ( part 2 of 2 )*/

> ] I am Borgs Bunny. What's assimilated, Doc?..................

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