# File lib/rvg/embellishable.rb, line 47
        def initialize(rx, ry, cx=0, cy=0)
            super()
            rx, ry, cx, cy = Magick::RVG.convert_to_float(rx, ry, cx, cy)
            if rx < 0 || ry < 0
                raise ArgumentError, "radii must be >= 0 (#{rx}, #{ry} given)"
            end
            @primitive = :ellipse
            # Ellipses are always complete.
            @args = [cx, cy, rx, ry, 0, 360]
        end