# File lib/rvg/embellishable.rb, line 90
        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