GitHub - ultraspeed/Google-Maps-Point-in-Polygon: Adds a containsLatLng() method to Polygon class for Google Maps API v3

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maps.google.polygon.containsLatLng.js		maps.google.polygon.containsLatLng.js

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This is a Javascript Google Maps v3 extension for the Polygon class to detect whether or not a point resides within it.

Simplest Usage:

var coordinate = new google.maps.LatLng(40, -90);                                                                                                                                                                                                       
var polygon = new google.maps.Polygon([], "#000000", 1, 1, "#336699", 0.3);
var isWithinPolygon = polygon.containsLatLng(coordinate);