状态机模式
https://gameinstitute.qq.com/community/detail/107456
多边形相交检测算法
https://www.cnblogs.com/Kurodo/archive/2012/08/08/2628688.html
https://wenku.baidu.com/view/52727ba4f111f18582d05a5b.html
c#多种UDP库
https://blog.csdn.net/u010019717/article/details/81395201
四叉树优化碰撞检测