模拟光线在多边形中反射的全过程。在程序中指定一个多边形，在对变形的某一点沿着某个方向，发射出一条光线，模拟光线在多边形中反射的全过程。点一下鼠标执行一次-Simulation of light reflection in the polygon as a whole. In the program to specify a polygon, a point in the deformed along one direction, emitting a light to simulate light reflection in the polygon in the entire process. Performs a mouse click