Polygon Arrays

This example creates a map with a simple polygon which displays information in response to a click event.

Read the documentation.

TypeScript

// This example creates a simple polygon representing the Bermuda Triangle. // When the user clicks on the polygon an info window opens, showing // information about the polygon's coordinates.  let map: google.maps.Map;  let infoWindow: google.maps.InfoWindow;  function initMap(): void {   map = new google.maps.Map(document.getElementById("map") as HTMLElement, {     zoom: 5,     center: { lat: 24.886, lng: -70.268 },     mapTypeId: "terrain",   });    // Define the LatLng coordinates for the polygon.   const triangleCoords: google.maps.LatLngLiteral[] = [     { lat: 25.774, lng: -80.19 },     { lat: 18.466, lng: -66.118 },     { lat: 32.321, lng: -64.757 },   ];    // Construct the polygon.   const bermudaTriangle = new google.maps.Polygon({     paths: triangleCoords,     strokeColor: "#FF0000",     strokeOpacity: 0.8,     strokeWeight: 3,     fillColor: "#FF0000",     fillOpacity: 0.35,   });    bermudaTriangle.setMap(map);    // Add a listener for the click event.   bermudaTriangle.addListener("click", showArrays);    infoWindow = new google.maps.InfoWindow(); }  function showArrays(event: any) {   // Since this polygon has only one path, we can call getPath() to return the   // MVCArray of LatLngs.   // @ts-ignore   const polygon = this as google.maps.Polygon;   const vertices = polygon.getPath();    let contentString =     "<b>Bermuda Triangle polygon</b><br>" +     "Clicked location: <br>" +     event.latLng.lat() +     "," +     event.latLng.lng() +     "<br>";    // Iterate over the vertices.   for (let i = 0; i < vertices.getLength(); i++) {     const xy = vertices.getAt(i);      contentString +=       "<br>" + "Coordinate " + i + ":<br>" + xy.lat() + "," + xy.lng();   }    // Replace the info window's content and position.   infoWindow.setContent(contentString);   infoWindow.setPosition(event.latLng);    infoWindow.open(map); }  declare global {   interface Window {     initMap: () => void;   } } window.initMap = initMap;
index.ts

JavaScript

// This example creates a simple polygon representing the Bermuda Triangle. // When the user clicks on the polygon an info window opens, showing // information about the polygon's coordinates. let map; let infoWindow;  function initMap() {   map = new google.maps.Map(document.getElementById("map"), {     zoom: 5,     center: { lat: 24.886, lng: -70.268 },     mapTypeId: "terrain",   });    // Define the LatLng coordinates for the polygon.   const triangleCoords = [     { lat: 25.774, lng: -80.19 },     { lat: 18.466, lng: -66.118 },     { lat: 32.321, lng: -64.757 },   ];   // Construct the polygon.   const bermudaTriangle = new google.maps.Polygon({     paths: triangleCoords,     strokeColor: "#FF0000",     strokeOpacity: 0.8,     strokeWeight: 3,     fillColor: "#FF0000",     fillOpacity: 0.35,   });    bermudaTriangle.setMap(map);   // Add a listener for the click event.   bermudaTriangle.addListener("click", showArrays);   infoWindow = new google.maps.InfoWindow(); }  function showArrays(event) {   // Since this polygon has only one path, we can call getPath() to return the   // MVCArray of LatLngs.   // @ts-ignore   const polygon = this;   const vertices = polygon.getPath();   let contentString =     "<b>Bermuda Triangle polygon</b><br>" +     "Clicked location: <br>" +     event.latLng.lat() +     "," +     event.latLng.lng() +     "<br>";    // Iterate over the vertices.   for (let i = 0; i < vertices.getLength(); i++) {     const xy = vertices.getAt(i);      contentString +=       "<br>" + "Coordinate " + i + ":<br>" + xy.lat() + "," + xy.lng();   }    // Replace the info window's content and position.   infoWindow.setContent(contentString);   infoWindow.setPosition(event.latLng);   infoWindow.open(map); }  window.initMap = initMap;
index.js

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; } 
style.css

HTML

<html>   <head>     <title>Polygon Arrays</title>      <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&v=weekly"       defer     ></script>   </body> </html>
index.html

Try Sample

Clone Sample

Git and Node.js are required to run this sample locally. Follow these instructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application. 

  git clone -b sample-polygon-arrays https://github.com/googlemaps/js-samples.git   cd js-samples   npm i   npm start

Other samples can be tried by switching to any branch beginning with sample-SAMPLE_NAME. 

  git checkout sample-SAMPLE_NAME   npm i   npm start