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import requests

Now, OsmAnd performs another Dijkstra search, but this time on the much smaller "base graph." This graph consists only of the border points and the pre-calculated shortcut values between them.

。关于这个话题，heLLoword翻译官方下载提供了深入分析

# What you gain，这一点在夫子中也有详细论述

借助光栅原理，让屏幕发出的光只能从正面特定角度范围内看到，从而实现「大角度防窥」的效果：