/*_|_|   VESATEST.CPP   PUBLIC DOMAIN   PART 3 OF 3
_|_|_|   Example of using 800x600 and 640x480 VESA modes.
_|_|_|   No warrantee or guarantee.  Kurt Kuzba.  (8/24/1997)*/
/*
   Line is adapted from Bresnham.C in Bob Stout's SNIPPETS
*/
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 3 OF 3   */
> ] Opossums on the Information Rustic Road.....................
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