TypeScript
// 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(): void {
const map = new google.maps.Map(
document.getElementById("map") as HTMLElement,
{
center: { lat: 24.886, lng: -70.269 },
zoom: 5,
}
);
const triangleCoords = [
{ lat: 25.774, lng: -80.19 },
{ lat: 18.466, lng: -66.118 },
{ lat: 32.321, lng: -64.757 },
];
const bermudaTriangle = new google.maps.Polygon({ paths: triangleCoords });
google.maps.event.addListener(map, "click", (e) => {
const resultColor = google.maps.geometry.poly.containsLocation(
e.latLng,
bermudaTriangle
)
? "blue"
: "red";
const 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,
icon: {
path: resultPath,
fillColor: resultColor,
fillOpacity: 0.2,
strokeColor: "white",
strokeWeight: 0.5,
scale: 10,
},
});
});
}
declare global {
interface Window {
initMap: () => void;
}
}
window.initMap = initMap;
JavaScript
// 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() {
const map = new google.maps.Map(document.getElementById("map"), {
center: { lat: 24.886, lng: -70.269 },
zoom: 5,
});
const triangleCoords = [
{ lat: 25.774, lng: -80.19 },
{ lat: 18.466, lng: -66.118 },
{ lat: 32.321, lng: -64.757 },
];
const bermudaTriangle = new google.maps.Polygon({ paths: triangleCoords });
google.maps.event.addListener(map, "click", (e) => {
const resultColor = google.maps.geometry.poly.containsLocation(
e.latLng,
bermudaTriangle,
)
? "blue"
: "red";
const 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,
icon: {
path: resultPath,
fillColor: resultColor,
fillOpacity: 0.2,
strokeColor: "white",
strokeWeight: 0.5,
scale: 10,
},
});
});
}
window.initMap = initMap;
CSS
/*
* 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;
}
HTML
<html>
<head>
<title>Polygon Contains Location</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
<link rel="stylesheet" type="text/css" href="./style.css" />
<script type="module" src="./index.js"></script>
</head>
<body>
<div id="map"></div>
<!--
The `defer` attribute causes the script to execute after the full HTML
document has been parsed. For non-blocking uses, avoiding race conditions,
and consistent behavior across browsers, consider loading using Promises. See
https://developers.google.com/maps/documentation/javascript/load-maps-js-api
for more information.
-->
<script
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&libraries=geometry&v=weekly"
defer
></script>
</body>
</html>