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.

// 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() {
  var 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.
  var triangleCoords = [
    {lat: 25.774, lng: -80.190},
    {lat: 18.466, lng: -66.118},
    {lat: 32.321, lng: -64.757}
  ];

  var bermudaTriangle = new google.maps.Polygon({
    paths: triangleCoords,
    strokeColor: '#FF0000',
    strokeOpacity: 0.8,
    strokeWeight: 3,
    fillColor: '#FF0000',
    fillOpacity: 0.35
  });
  bermudaTriangle.setMap(map);
}
<div id="map"></div>
/* 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;
}
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap">
</script>

Try it yourself

You can experiment with this code in JSFiddle by clicking the <> icon in the top-right corner of the code window.

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Polygon Auto-Completion</title>
    <style>
      /* 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>
  </head>
  <body>
    <div id="map"></div>
    <script>

      // 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() {
        var 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.
        var triangleCoords = [
          {lat: 25.774, lng: -80.190},
          {lat: 18.466, lng: -66.118},
          {lat: 32.321, lng: -64.757}
        ];

        var bermudaTriangle = new google.maps.Polygon({
          paths: triangleCoords,
          strokeColor: '#FF0000',
          strokeOpacity: 0.8,
          strokeWeight: 3,
          fillColor: '#FF0000',
          fillOpacity: 0.35
        });
        bermudaTriangle.setMap(map);
      }
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
    </script>
  </body>
</html>

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