// 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);
}