The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
Update: GtkSvg is an unsandboxed, in-process SVG parser written in C, so we don’t recommend using it for untrusted content — it is meant for trusted content such as icons, logos and other application resources. If you want to load a random SVG of unknown providence, please use a proper image loading framework like glycin (but still, tell us if you find SVGs that crash GtkSvg).
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Сайт Роскомнадзора атаковали18:00。业内人士推荐51吃瓜作为进阶阅读
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