    # File lib/rvg/misc.rb, line 643
                    def rotate(degrees)
                        degrees = Magick::RVG.convert_one_to_float(degrees)
                        @gc.rotate(degrees)
                        @sx =  Math.cos(GraphicContext.degrees_to_radians(degrees))
                        @rx =  Math.sin(GraphicContext.degrees_to_radians(degrees))
                        @ry = -Math.sin(GraphicContext.degrees_to_radians(degrees))
                        @sy =  Math.cos(GraphicContext.degrees_to_radians(degrees))
                        concat_matrix()
                        nil
                    end