docs: def clip_ellipsis(self, x, y, radius, ratio=1.0):
          """Create an elliptical clip region. You must call endclip() after
          you completed drawing. See also the ellipsis method."""
  
          self.gsave()
          self.newpath()
          self.moveto(xscale(x) + nscale(radius), yscale(y))
          self.path_arc(xscale(x), yscale(y), nscale(radius), ratio, 0, 360)
          self.closepath()
          self.__clip_stack.append(self.__clip_box)
          self.clip_sub()