判断点是否在多变形内： 先画一个多边形 然后判断，如果在多边形内，显示“N” 如果在多边形外，显示“W”-in judgment over whether a deformation : the first draw a polygon then judge if the polygon, show "N" If the polygon, shows that the "W"

区域判断，向量判断，点在凸多边形内，几何，算法-Regional judgment