# File lib/rvg/transformable.rb, line 72
            def scale(sx, sy=nil)
                sy ||= sx
                begin
                    @transforms << [:scale, [Float(sx), Float(sy)]]
                rescue ArgumentError
                    raise ArgumentError, "arguments must be convertable to float (got #{sx.class}, #{sy.class})"
                end
                yield(self) if block_given?
                self
            end