module Ray
  class Drawable
    # Draws the drawable on an image.
    def draw_on(image)
      image.draw_drawable self
    end

    # Draws the drawable.
    #
    # @option opts [Ray::Image] :on (Ray.screen) The image to draw the drawable
    #   on.
    def draw(opts = {})
      draw_on(opts[:on] || Ray.screen)
    end
  end
end