This example draws a red circle when the clicked point falls outside of the specified polygon (the Bermuda Triangle), and a blue triangle when the click falls inside the polygon.
Read the documentation.
// This example requires the Geometry library. Include the libraries=geometry // parameter when you first load the API. For example: // <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry"> function initMap() { var map = new google.maps.Map(document.getElementById('map'), { center: {lat: 24.886, lng: -70.269}, zoom: 5, }); var triangleCoords = [ {lat: 25.774, lng: -80.19}, {lat: 18.466, lng: -66.118}, {lat: 32.321, lng: -64.757} ]; var bermudaTriangle = new google.maps.Polygon({paths: triangleCoords}); google.maps.event.addListener(map, 'click', function(e) { var resultColor = google.maps.geometry.poly.containsLocation(e.latLng, bermudaTriangle) ? 'blue' : 'red'; var resultPath = google.maps.geometry.poly.containsLocation(e.latLng, bermudaTriangle) ? // A triangle. "m 0 -1 l 1 2 -2 0 z" : google.maps.SymbolPath.CIRCLE; new google.maps.Marker({ position: e.latLng, map: map, icon: { path: resultPath, fillColor: resultColor, fillOpacity: .2, strokeColor: 'white', strokeWeight: .5, scale: 10 } }); }); }
<div id="map"></div>
/* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; }
<!-- Replace the value of the key parameter with your own API key. --> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&libraries=geometry&callback=initMap" async defer></script>
Try it yourself
You can experiment with this code in JSFiddle by clicking the <>
icon in the
top-right corner of the code window.
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>containsLocation()</title>
<style>
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
height: 100%;
margin: 0;
padding: 0;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
// This example requires the Geometry library. Include the libraries=geometry
// parameter when you first load the API. For example:
// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry">
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
center: {lat: 24.886, lng: -70.269},
zoom: 5,
});
var triangleCoords = [
{lat: 25.774, lng: -80.19},
{lat: 18.466, lng: -66.118},
{lat: 32.321, lng: -64.757}
];
var bermudaTriangle = new google.maps.Polygon({paths: triangleCoords});
google.maps.event.addListener(map, 'click', function(e) {
var resultColor =
google.maps.geometry.poly.containsLocation(e.latLng, bermudaTriangle) ?
'blue' :
'red';
var resultPath =
google.maps.geometry.poly.containsLocation(e.latLng, bermudaTriangle) ?
// A triangle.
"m 0 -1 l 1 2 -2 0 z" :
google.maps.SymbolPath.CIRCLE;
new google.maps.Marker({
position: e.latLng,
map: map,
icon: {
path: resultPath,
fillColor: resultColor,
fillOpacity: .2,
strokeColor: 'white',
strokeWeight: .5,
scale: 10
}
});
});
}
</script>
<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry&callback=initMap"
async defer></script>
</body>
</html>