!7

static int points;
static ImageSurface is;
static int w = 500, h = 500;
static int rw = 50, rh = 50, border = 10;
static int x1, y1;

p-substance {
  nextImage();
}

svoid nextImage {
  RGBImage img = rgbImage(Color.white, w, h);
  x1 = random(border, w-rw-border);
  y1 = random(border, h-rh-border);
  rgbFillRect(img, x1, y1, rw, rh, Color.red);
  bool first = is == null;
  is = showImage(is, img);
  if (first) {
    onLeftClick(is, voidfunc(Pt p) {
      if (new Rect(x1, y1, rw, rh).contains(p)) {
        ++points;
        print("Points: " + points);
        nextImage();
      }
    });
    disableImageSurfaceSelector(is);
  }
}