Draggable Polygons

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.

Read the documentation.

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.

function initMap(): void {
  const map = new google.maps.Map(
    document.getElementById("map") as HTMLElement,
    {
      zoom: 1,
      center: { lat: 24.886, lng: -70.268 },
      mapTypeId: "terrain",
    }
  );

  const blueCoords = [
    { lat: 25.774, lng: -60.19 },
    { lat: 18.466, lng: -46.118 },
    { lat: 32.321, lng: -44.757 },
  ];

  const redCoords = [
    { 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.
  new google.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.
  new google.maps.Polygon({
    map,
    paths: blueCoords,
    strokeColor: "#0000FF",
    strokeOpacity: 0.8,
    strokeWeight: 2,
    fillColor: "#0000FF",
    fillOpacity: 0.35,
    draggable: true,
    geodesic: false,
  });
}

declare global {
  interface Window {
    initMap: () => void;
  }
}
window.initMap = initMap;

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.
function initMap() {
  const map = new google.maps.Map(document.getElementById("map"), {
    zoom: 1,
    center: { lat: 24.886, lng: -70.268 },
    mapTypeId: "terrain",
  });
  const blueCoords = [
    { lat: 25.774, lng: -60.19 },
    { lat: 18.466, lng: -46.118 },
    { lat: 32.321, lng: -44.757 },
  ];
  const redCoords = [
    { 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.
  new google.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.
  new google.maps.Polygon({
    map,
    paths: blueCoords,
    strokeColor: "#0000FF",
    strokeOpacity: 0.8,
    strokeWeight: 2,
    fillColor: "#0000FF",
    fillOpacity: 0.35,
    draggable: true,
    geodesic: false,
  });
}

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>Draggable Polygons</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 callback 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
     with https://www.npmjs.com/package/@googlemaps/js-api-loader.
    -->
    <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 these instructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.

  git clone -b sample-polygon-draggable 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