    # File lib/rvg/embellishable.rb, line 91
                def initialize(width, height, x=0, y=0)
                    super()
                    width, height, x, y = Magick::RVG.convert_to_float(width, height, x, y)
                    if width < 0 || height < 0
                        raise ArgumentError, "width, height must be >= 0 (#{width}, #{height} given)"
                    end
                    @args = [x, y, x+width, y+height]
                    @primitive = :rectangle
                end