The algorithm walks the tree recursively. At each node, it checks: does this node's bounding box overlap with the query rectangle? If not, the entire subtree gets pruned (skipped). If it does overlap, it tests the node's points against the query and recurses into the children.
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logging them, and calculating totals. But it was now all under computer control,，详情可参考91视频
The whole algorithm can be expressed in psuedocode like so: