用C++语言实现的各种计算几何算法, 如判断点是否在多边形内, 多边形凸凹性判断, 寻找点集凸包的卷包裹法,求简单多边形的重心,求从多边形外一点出发到该多边形的切线,判断线段是否相交等等! -Using C++ language implementation of a variety of computational geometry algorithms, such as point to determine whether the polygon, the polygon convexity