// random rect inside outer with any size (0*0 to full width/height)

static Rect randomRect(Rect outer) {

  var w = random_incl(outer.w);

  var h = random_incl(outer.h);

  ret randomRect(w, h, outer);

}

static Rect randomRect(int w, int h, Rect outer) {

  ret translateRect(outer.x, outer.y, randomRect(outer.w, outer.h, 0, w, h));

}

static Rect randomRect(Rect outer, int w, int h) {

  ret randomRect(w, h, outer);

}

static Rect randomRect(int w, int h, int border default 0, int rw, int rh) {

  if (rw > w-border*2 || rh > h-border*2) null;

  int ww = random(border, w-border-rw);

  int hh = random(border, h-border-rh);

  ret new Rect(ww, hh, rw, rh);

}

static Rect randomRect(int w, int h) {

  // making variables to ensure functions are called in the same order every time

  int rw = random(w);

  int rh = random(h);

  ret randomRect(w, h, 0, rw, rh);

}

ifclass RGBImage

  static Rect randomRect(RGBImage img, int rw, int rh) {

    ret randomRect(img.w(), img.h(), 0, rw, rh);

  }

  static Rect randomRect(RGBImage img) {

    ret randomRect(img.w(), img.h());

  }

endif

// on currentImage()

static Rect randomRect() {

  ret randomRect(currentImage().getWidth(), currentImage().getHeight());

}

static Rect randomRect(BufferedImage img, int rw, int rh) {

  ret randomRect(img.getWidth(), img.getHeight(), 0, rw, rh);

}