The simplest approach is to check every single point. Compute the distance from the user's location to every restaurant in the database, keep the ones that are close enough, and throw away the rest.
If this code was a really hot part of your program, you might be
Source: Computational Materials Science, Volume 267，更多细节参见Line官方版本下载
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，这一点在同城约会中也有详细论述
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