以上で完了です。

開発を始めるには、デベロッパー ドキュメント をご覧下さい。

Google Maps JavaScript API をアクティベートする

まず初めに Google Developers Console で次の作業を行います。

  1. プロジェクトを作成または選択する
  2. Google Maps JavaScript API と関連サービスをアクティベートする
  3. 適切なキーを作成する
続ける

Encoding methods

This example demonstrates path encoding using the Geometry library. Click the map to create a polyline. The encoding of this polyline then appears in the text box.

Read the documentation or view this example full screen.

// This example requires the Geometry library. Include the libraries=geometry
// parameter when you first load the API. For example:
// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry">

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 14,
    center: {lat: 34.366, lng: -89.519}
  });
  var poly = new google.maps.Polyline({
    strokeColor: '#000000',
    strokeOpacity: 1,
    strokeWeight: 3,
    map: map
  });

  // Add a listener for the click event
  google.maps.event.addListener(map, 'click', function(event) {
    addLatLngToPoly(event.latLng, poly);
  });
}

/**
 * Handles click events on a map, and adds a new point to the Polyline.
 * Updates the encoding text area with the path's encoded values.
 */
function addLatLngToPoly(latLng, poly) {
  var path = poly.getPath();
  // Because path is an MVCArray, we can simply append a new coordinate
  // and it will automatically appear
  path.push(latLng);

  // Update the text field to display the polyline encodings
  var encodeString = google.maps.geometry.encoding.encodePath(path);
  if (encodeString) {
    document.getElementById('encoded-polyline').value = encodeString;
  }
}
<div id="map"></div>
<div id="right-panel">
  <div>Encoding:</div>
  <textarea id="encoded-polyline"></textarea>
</div>
#right-panel {
  font-family: 'Roboto','sans-serif';
  line-height: 30px;
  padding-left: 10px;
}

#right-panel select, #right-panel input {
  font-size: 15px;
}

#right-panel select {
  width: 100%;
}

#right-panel i {
  font-size: 12px;
}
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
#map {
  height: 100%;
  width: 50%;
  float: left;
}
#right-panel {
  width: 46%;
  float: left;
}
#encoded-polyline {
  height: 100px;
  width: 100%;
}
<!-- Replace the value of the key parameter with your own API key. -->
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&libraries=geometry&callback=initMap"
        async defer></script>

実際に試す

コードブロックの右上にカーソルを合わせて、コードをコピーするか、コードを JSFiddl で開きます。

<!DOCTYPE html>
<html>
  <head>
    <title>Encoding methods</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <style>
      #right-panel {
        font-family: 'Roboto','sans-serif';
        line-height: 30px;
        padding-left: 10px;
      }

      #right-panel select, #right-panel input {
        font-size: 15px;
      }

      #right-panel select {
        width: 100%;
      }

      #right-panel i {
        font-size: 12px;
      }
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
        width: 50%;
        float: left;
      }
      #right-panel {
        width: 46%;
        float: left;
      }
      #encoded-polyline {
        height: 100px;
        width: 100%;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <div id="right-panel">
      <div>Encoding:</div>
      <textarea id="encoded-polyline"></textarea>
    </div>
    <script>
      // This example requires the Geometry library. Include the libraries=geometry
      // parameter when you first load the API. For example:
      // <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry">

      function initMap() {
        var map = new google.maps.Map(document.getElementById('map'), {
          zoom: 14,
          center: {lat: 34.366, lng: -89.519}
        });
        var poly = new google.maps.Polyline({
          strokeColor: '#000000',
          strokeOpacity: 1,
          strokeWeight: 3,
          map: map
        });

        // Add a listener for the click event
        google.maps.event.addListener(map, 'click', function(event) {
          addLatLngToPoly(event.latLng, poly);
        });
      }

      /**
       * Handles click events on a map, and adds a new point to the Polyline.
       * Updates the encoding text area with the path's encoded values.
       */
      function addLatLngToPoly(latLng, poly) {
        var path = poly.getPath();
        // Because path is an MVCArray, we can simply append a new coordinate
        // and it will automatically appear
        path.push(latLng);

        // Update the text field to display the polyline encodings
        var encodeString = google.maps.geometry.encoding.encodePath(path);
        if (encodeString) {
          document.getElementById('encoded-polyline').value = encodeString;
        }
      }
    </script>
    <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry&callback=initMap"
        async defer></script>
  </body>
</html>

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Google Maps JavaScript API
Google Maps JavaScript API
ご不明な点がありましたら、Google のサポートページをご覧ください。