Polygon Auto-Completion

This example creates a map with a simple polygon, to demonstrate the autoclose behavior for polygons. Note that only three coordinates are defined. There's no need to specify the final coordinates to complete the polygon, because the Google Maps JavaScript API will automatically draw the closing side.

Read the documentation.

TypeScript

// This example creates a simple polygon representing the Bermuda Triangle. Note // that the code specifies only three LatLng coordinates for the polygon. The // API automatically draws a stroke connecting the last LatLng back to the first // LatLng.  function initMap(): void {   const 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's path. Note that there's   // no need to specify the final coordinates to complete the polygon, because   // The Google Maps JavaScript API will automatically draw the closing side.   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,     strokeColor: "#FF0000",     strokeOpacity: 0.8,     strokeWeight: 3,     fillColor: "#FF0000",     fillOpacity: 0.35,   });    bermudaTriangle.setMap(map); }

JavaScript

// This example creates a simple polygon representing the Bermuda Triangle. Note // that the code specifies only three LatLng coordinates for the polygon. The // API automatically draws a stroke connecting the last LatLng back to the first // LatLng. function initMap() {   const 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's path. Note that there's   // no need to specify the final coordinates to complete the polygon, because   // The Google Maps JavaScript API will automatically draw the closing side.   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,     strokeColor: "#FF0000",     strokeOpacity: 0.8,     strokeWeight: 3,     fillColor: "#FF0000",     fillOpacity: 0.35,   });    bermudaTriangle.setMap(map); }

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

<!DOCTYPE html> <html>   <head>     <title>Polygon Auto-Completion</title>     <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>     <link rel="stylesheet" type="text/css" href="./style.css" />     <script src="./index.js"></script>   </head>   <body>     <div id="map"></div>      <!-- Async script executes immediately and must be after any DOM elements used in callback. -->     <script       src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&v=weekly"       async     ></script>   </body> </html>

// This example creates a simple polygon representing the Bermuda Triangle. Note // that the code specifies only three LatLng coordinates for the polygon. The // API automatically draws a stroke connecting the last LatLng back to the first // LatLng. function initMap() { const 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's path. Note that there's // no need to specify the final coordinates to complete the polygon, because // The Google Maps JavaScript API will automatically draw the closing side. 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, strokeColor: "#FF0000", strokeOpacity: 0.8, strokeWeight: 3, fillColor: "#FF0000", fillOpacity: 0.35, }); bermudaTriangle.setMap(map); }

/* 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; }

<!DOCTYPE html> <html> <head> <title>Polygon Auto-Completion</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></div> <!-- Async script executes immediately and must be after any DOM elements used in callback. --> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly&channel=2" async ></script> </body> </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-autoclose 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

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Last updated 2021-11-23 UTC.