def draw(surface, z_order, colour)
      surface.draw_rectangle(position, size, z_order, colour)
    end
def draw(surface, z_order, colour)
      surface.draw_rectangle(position, size, z_order, colour)
    end
Duplicate a Region, must be done explicitly to avoid aliasing.
 Draw a rectangle on the specified +surface+ at the specified +z_order+
 and with the specified +colour+