同素变换的示例源代码：可以将平面上一个四边形内的点映射到对应的一个距形内，对于平面点的较正或坐标变换比较有用。可直接在VS2005下编译运行。-Transform with the prime example of source code: the plane can be a point inside the quadrilateral is mapped to a distance corresponding to the shape, the point for plane or coor