# File lib/rvg/transformable.rb, line 87
            def rotate(angle, *args)
                begin
                    case args.length
                        when 0
                            @transforms << [:rotate, [Float(angle)]]
                        when 2
                            cx, cy = Float(args[0]), Float(args[1])
                            @transforms << [:translate, [cx, cy]]
                            @transforms << [:rotate, [angle]]
                            @transforms << [:translate, [-cx, -cy]]
                        else
                            raise ArgumentError, "wrong number of arguments (#{args.length} for 1 or 3)"
                    end
                rescue ArgumentError
                    raise ArgumentError, "arguments must be convertable to float (got #{[angle, *args].collect {|a| a.class}.join(', ')})"
                end
                yield(self) if block_given?
                self
            end