Polygon Arrays

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

TypeScript

// 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.

let map: google.maps.Map;

let infoWindow: google.maps.InfoWindow;

function initMap(): void {
  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.
  const triangleCoords: google.maps.LatLngLiteral[] = [
    { lat: 25.774, lng: -80.19 },
    { lat: 18.466, lng: -66.118 },
    { lat: 32.321, lng: -64.757 },
  ];

  // Construct the polygon.
  const 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();
}

function showArrays(event: any) {
  // Since this polygon has only one path, we can call getPath() to return the
  // MVCArray of LatLngs.
  // @ts-ignore
  const polygon = this as google.maps.Polygon;
  const vertices = polygon.getPath();

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

  // Iterate over the vertices.
  for (let i = 0; i < vertices.getLength(); i++) {
    const 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);
}index.ts

JavaScript

// 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.
let map;
let 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.
  const triangleCoords = [
    { lat: 25.774, lng: -80.19 },
    { lat: 18.466, lng: -66.118 },
    { lat: 32.321, lng: -64.757 },
  ];
  // Construct the polygon.
  const 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();
}

function showArrays(event) {
  // Since this polygon has only one path, we can call getPath() to return the
  // MVCArray of LatLngs.
  const polygon = this;
  const vertices = polygon.getPath();
  let contentString =
    "<b>Bermuda Triangle polygon</b><br>" +
    "Clicked location: <br>" +
    event.latLng.lat() +
    "," +
    event.latLng.lng() +
    "<br>";

  // Iterate over the vertices.
  for (let i = 0; i < vertices.getLength(); i++) {
    const 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);
}
index.js

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;
}
style.css

HTML

<!DOCTYPE html>
<html>
  <head>
    <title>Polygon Arrays</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      defer
    ></script>
    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./index.js"></script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>sample.html

All

<!DOCTYPE html>
<html>
  <head>
    <title>Polygon Arrays</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      defer
    ></script>
    <style type="text/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;
      }
    </style>
    <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.
      let map;
      let 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.
        const triangleCoords = [
          { lat: 25.774, lng: -80.19 },
          { lat: 18.466, lng: -66.118 },
          { lat: 32.321, lng: -64.757 },
        ];
        // Construct the polygon.
        const 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();
      }

      function showArrays(event) {
        // Since this polygon has only one path, we can call getPath() to return the
        // MVCArray of LatLngs.
        const polygon = this;
        const vertices = polygon.getPath();
        let contentString =
          "<b>Bermuda Triangle polygon</b><br>" +
          "Clicked location: <br>" +
          event.latLng.lat() +
          "," +
          event.latLng.lng() +
          "<br>";

        // Iterate over the vertices.
        for (let i = 0; i < vertices.getLength(); i++) {
          const 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>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>
inline.html

// 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. let map; let 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. const triangleCoords = [ { lat: 25.774, lng: -80.19 }, { lat: 18.466, lng: -66.118 }, { lat: 32.321, lng: -64.757 }, ]; // Construct the polygon. const 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(); } function showArrays(event) { // Since this polygon has only one path, we can call getPath() to return the // MVCArray of LatLngs. const polygon = this; const vertices = polygon.getPath(); let contentString = "<b>Bermuda Triangle polygon</b><br>" + "Clicked location: <br>" + event.latLng.lat() + "," + event.latLng.lng() + "<br>"; // Iterate over the vertices. for (let i = 0; i < vertices.getLength(); i++) { const 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); }

/* 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 Arrays</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBIwzALxUPNbatRBj3Xi1Uhp0fFzwWNBkE&callback=initMap&libraries=&v=weekly" defer ></script>  </head> <body> <div id="map"></div> </body> </html>

Create a starter application from sample

A skeleton starter application using TypeScript, Webpack, and Babel can be generated from this sample using one of the methods below.

Run Locally

Node.js is required to run this sample locally. Follow these instructions to install Node.js and NPM.

npx @googlemaps/js-samples init polygon-arrays DESTINATION_FOLDER

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