1．掌握用户按键事件处理方法 2．进一步掌握Sprite类 3．掌握碰撞检测的处理过程 4．实现英雄行走功能-1. Master user key event handling method 2. Further understand Sprite Class 3. Master the process of collision detection 4. The realization of the hero walking

Video surveillance systems have long been in use to monitor security sensitive areas. The history of video surveillance consists of three generations of systems which are called 1GSS, 2GSS and 3GSS. The first generation surveillance systems (1GS

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Sensor Event Detection