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Draggable Polygons

  • This example demonstrates how to create draggable triangles on a Google Map using the Maps JavaScript API.

  • It showcases the use of thegeodesic property, where the red triangle's shape adapts as it's dragged due to its geodesic nature, while the blue triangle remains unchanged.

  • The sample provides code snippets in JavaScript, TypeScript, HTML, and CSS to illustrate the implementation.

  • Users can interact with a live demo of the draggable triangles through provided links to JSFiddle and Google Cloud Shell.

  • Instructions are included for cloning and running the sample locally using Git and Node.js.

This example creates draggable triangles on the map. Note also that the redtriangle is geodesic, so its shape changes as you drag it north or south.

Read thedocumentation.

TypeScript

// This example creates draggable triangles on the map.// Note also that the red triangle is geodesic, so its shape changes// as you drag it north or south.functioninitMap():void{constmap=newgoogle.maps.Map(document.getElementById("map")asHTMLElement,{zoom:1,center:{lat:24.886,lng:-70.268},mapTypeId:"terrain",});constblueCoords=[{lat:25.774,lng:-60.19},{lat:18.466,lng:-46.118},{lat:32.321,lng:-44.757},];constredCoords=[{lat:25.774,lng:-80.19},{lat:18.466,lng:-66.118},{lat:32.321,lng:-64.757},];// Construct a draggable red triangle with geodesic set to true.newgoogle.maps.Polygon({map,paths:redCoords,strokeColor:"#FF0000",strokeOpacity:0.8,strokeWeight:2,fillColor:"#FF0000",fillOpacity:0.35,draggable:true,geodesic:true,});// Construct a draggable blue triangle with geodesic set to false.newgoogle.maps.Polygon({map,paths:blueCoords,strokeColor:"#0000FF",strokeOpacity:0.8,strokeWeight:2,fillColor:"#0000FF",fillOpacity:0.35,draggable:true,geodesic:false,});}declareglobal{interfaceWindow{initMap:()=>void;}}window.initMap=initMap;
Note: Read theguide on using TypeScript and Google Maps.

JavaScript

// This example creates draggable triangles on the map.// Note also that the red triangle is geodesic, so its shape changes// as you drag it north or south.functioninitMap(){constmap=newgoogle.maps.Map(document.getElementById("map"),{zoom:1,center:{lat:24.886,lng:-70.268},mapTypeId:"terrain",});constblueCoords=[{lat:25.774,lng:-60.19},{lat:18.466,lng:-46.118},{lat:32.321,lng:-44.757},];constredCoords=[{lat:25.774,lng:-80.19},{lat:18.466,lng:-66.118},{lat:32.321,lng:-64.757},];// Construct a draggable red triangle with geodesic set to true.newgoogle.maps.Polygon({map,paths:redCoords,strokeColor:"#FF0000",strokeOpacity:0.8,strokeWeight:2,fillColor:"#FF0000",fillOpacity:0.35,draggable:true,geodesic:true,});// Construct a draggable blue triangle with geodesic set to false.newgoogle.maps.Polygon({map,paths:blueCoords,strokeColor:"#0000FF",strokeOpacity:0.8,strokeWeight:2,fillColor:"#0000FF",fillOpacity:0.35,draggable:true,geodesic:false,});}window.initMap=initMap;
Note: The JavaScript is compiled from the TypeScript snippet.

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>Draggable Polygons</title>    <link rel="stylesheet" type="text/css" href="./style.css" />    <script type="module" src="./index.js"></script>  </head>  <body>    <div></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>

Try Sample

Clone Sample

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

gitclone-bsample-polygon-draggablehttps://github.com/googlemaps/js-samples.gitcdjs-samplesnpminpmstart

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

gitcheckoutsample-SAMPLE_NAMEnpminpmstart

Except as otherwise noted, the content of this page is licensed under theCreative Commons Attribution 4.0 License, and code samples are licensed under theApache 2.0 License. For details, see theGoogle Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-12-11 UTC.