    # File lib/rubygame/rect.rb, line 524
            def inflate(x,y)
                    return self.class.new(self.at(0) - x.div(2),
                                                                                                            self.at(1) - y.div(2),
                                                                                                            self.at(2) + x,
                                                                                                            self.at(3) + y)
            end