A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
capturePlayer(this);
。关于这个话题，WPS官方版本下载提供了深入分析
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paddedTopBorderCache [200][200]string，这一点在同城约会中也有详细论述
Government racks up £100m bill responding to Covid inquiry