Quadtrees aren't limited to point data. They can also partition regions of continuous data, like the pixels of an image.
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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.
// First, we acquire a reader that gives an exclusive lock
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