size(360,180);
for(int x = 0; x<360; x++){
  for(int y = 0; y<180; y++){
    int red = (int)(255. * cos( PI/180. * x) );
    int green = (int)(255. * sin( PI/180. * y));
    int blue = 0;
    red = abs(red) % 255;
    green = abs(green) % 255;
    blue = abs(blue) % 255;
    stroke(red, green, blue);
    rect(x, y,1,1);
  }
}