网格索引，先输入点数再点绘制，矩形和圆形拉框是用来找点的，有的时候会有bug，请大家多多包含，这个还有待改善。-Grid index, the first input points and then point to draw rectangular and circular pull box is used to find the point, and sometimes there will be a bug, please include a lot, this has yet to be