//<pre>
public class testPix extends PixApplet
{
   double rgb[] = {0,0,0};

   public void setPix(int frame) {
      for (int x = 0 ; x < W ; x++)
      for (int y = 0 ; y < H ; y++) {
         double X = 2.0 *    x  / W - 1.0;
	 double Y = 2.0 * (H-y) / W - 1.0;
	 computeRGB(frame, X, Y, rgb);
	 pix[xy2i(x,y)] = pack((int)(255 * rgb[0]),
	                       (int)(255 * rgb[1]),
	                       (int)(255 * rgb[2]));
      }
      damage = true;
   }

   // THE OBJECT SPACE THAT I WILL RAYTRACE IN

   void computeRGB(int frame, double X, double Y, double rgb[]) {
      X = Math.sin(10 * X);
      Y = Math.sin(10 * Y);
      double S = Math.sin(4 * Math.sqrt(X * X + Y * Y) - frame);
      rgb[0] = .5 + .5 * S;
      S = Math.sin(5 * Math.sqrt(X * X + Y * Y) - frame);
      rgb[1] = .5 + .5 * S;
      S = Math.sin(6 * Math.sqrt(X * X + Y * Y) - frame);
      rgb[2] = .5 + .5 * S;
   }
}