/*_|_|   VESATEST.CPP   PUBLIC DOMAIN   PART 2 OF 2
_|_|_|   Example of using 800x600 and 640x480 VESA modes.
_|_|_|   No warrantee or guarantee.  Kurt Kuzba.  (8/24/1997)*/
void Vesamodes::Disk(int xc, int yc, int r, int c, int hg, int wd)
{
   int l, x = 0, d = (1 - r) << 1, w = (wd / hg) << 1;
   while(r >= 0)
   {
      for(l = xc - x; l <= xc + x; l++)
      {   Dot(l, yc + r, c);   Dot(l, yc - r, c);   }
      if(d + r > 0)   d -= (w * --r) - 1;
      if(x > d)       d += ((++x) << 1) + 1;
   }
}
void Vesamodes::~Vesamodes(void)
{
   _asm{
      mov ax, 0x03;
      int 10h;
   }
}
int rnd(int m){return (int)(((long)rand()*((long)m+1)-1)/RAND_MAX);}
void Vesamodes::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)
         Dot(y, x, c);
      else
         Dot(x, y, c);
      while(e >= 0)
      {
         y += sy;
         e -= ex;
      }
      x += sx;
      e += ey;
   }
   Dot(x2, y2, c);
}
void test(Vesamodes *V, int W = 640, int H = 480)
{
   while(!kbhit())
   {
      V->Line(rnd(W), rnd(H), rnd(W), rnd(H), rnd(255));
      V->Circle(rnd(W), rnd(H), rnd(200), rnd(255));
      V->Circle(rnd(W), rnd(H), rnd(200), rnd(255),
         10 + rnd(100), 10 + rnd(100));
      V->Circle(rnd(W), rnd(H), rnd(20), rnd(255),
         10 + rnd(100), 10 + rnd(100), 1);
   }
}
int main(void)
{
   time_t TM = time(NULL);
   srand((unsigned)TM);
   cout << "Hit any key to test 800x600x256" << endl;
   getch();
   Vesamodes *VM = new Vesamodes (800);
   test(VM, 800, 600);
   delete VM;
   cout << "Hit any key to test 640x480x256" << endl;
   getch();
   getch();
   VM = new Vesamodes;
   test(VM);
   delete VM;
   cout << "Hit any key to exit Vesatest.cpp" << endl;
   getch();
   getch();
   return 0;
}
/*_|_|   end   VESATEST.CPP   PUBLIC DOMAIN   PART 2 OF 2   */
> ] I had moral fibre once, but I did not inhale. [ B. Clinton ]
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