国外比较好的一个四叉树源码,对研究空间索引的同学有帮助,Abroad, a better source of a quadtree, the study of spatial index will help students

自己写的一个四叉树程序，虽然建立了，但是内容还很不全面。建立了一个正方形，把数据部分放置的其中点的坐标。-To write a quadtree procedure, although established, but the content is far from comprehensive. The establishment of a square, part of the data to place the coordinates of one point.

用MFC生成四叉树的方式，主要通过建立一个向量来储存节点的坐标。-Generated by MFC quadtree approach, mainly through the establishment of a vector to store the coordinates of the node.