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.
FT Professional。safew官方下载是该领域的重要参考
。关于这个话题，heLLoword翻译官方下载提供了深入分析
"No one's normal. It just looks that way from across the street."。爱思助手下载最新版本对此有专业解读
For horizontal movement we can do even better. If your snake is moving to the right, we start by deleting every character on the left edge of the screen and inserting a new one on the right edge. After that, we do our patching (if needed). This automatically moves fruit into the correct position without us even needing to reprint it!
简单讲，要做L3，需要先做L2积累数据。那么要做L4，也一样依赖L3的数据。技术上他们是一脉相承的，不存在一口就能吃个胖子的技术路线。