Polygon Arrays

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

// 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.

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

  // Construct the polygon.
  var 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;
}

/** @this {google.maps.Polygon} */
function showArrays(event) {
  // Since this polygon has only one path, we can call getPath() to return the
  // MVCArray of LatLngs.
  var vertices = this.getPath();

  var contentString = '<b>Bermuda Triangle polygon</b><br>' +
      'Clicked location: <br>' + event.latLng.lat() + ',' + event.latLng.lng() +
      '<br>';

  // Iterate over the vertices.
  for (var i =0; i < vertices.getLength(); i++) {
    var 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);
}

<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 Arrays</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.
      // When the user clicks on the polygon an info window opens, showing
      // information about the polygon's coordinates.

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

        // Construct the polygon.
        var 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;
      }

      /** @this {google.maps.Polygon} */
      function showArrays(event) {
        // Since this polygon has only one path, we can call getPath() to return the
        // MVCArray of LatLngs.
        var vertices = this.getPath();

        var contentString = '<b>Bermuda Triangle polygon</b><br>' +
            'Clicked location: <br>' + event.latLng.lat() + ',' + event.latLng.lng() +
            '<br>';

        // Iterate over the vertices.
        for (var i =0; i < vertices.getLength(); i++) {
          var 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);
      }
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
    </script>
  </body>
</html>