GoogleMap occurrence of coordinates in a polygon, how to check?

Question

JavaScript

Good afternoon, there was a task to check whether the coordinates are included in the polygon or not, rummaged through Google so I didn’t find anything intelligible. Is it possible to do this by means of the library itself or not?

Answer 1

The problem of whether a point belongs to a polygon
Here is an example in JAVA scripts.inf.ua/?p=306
it will not be difficult to rewrite it in JS
Here is a piece of my function in PHP
pastebin.com/WG4KqtdX