What stays the [b]same [/b]and what [b]changes[/b] as you move the points around?[br]Are there any points that do not move under this transformation?[br]Where would the co-ordinate (x,y) map to?[br][br]随着点的移动，什么保持不变，什么改变？[br] 在此转换过程中，有没有要解决的问题？[br] 坐标（x，y）会映射到哪里？

[color=#0a971e]Created by N.Trubridge[/color]