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

Draggable Polygons

Read the documentation or view this example full screen.

// 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() {

  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 1,
    center: {lat: 24.886, lng: -70.268},
    mapTypeId: 'terrain'
  });

  var blueCoords = [
    {lat: 25.774, lng: -60.190},
    {lat: 18.466, lng: -46.118},
    {lat: 32.321, lng: -44.757}
  ];

  var redCoords = [
    {lat: 25.774, lng: -80.190},
    {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: 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: map,
    paths: blueCoords,
    strokeColor: '#0000FF',
    strokeOpacity: 0.8,
    strokeWeight: 2,
    fillColor: '#0000FF',
    fillOpacity: 0.35,
    draggable: true,
    geodesic: false
  });
}
<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>

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>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Draggable Polygons</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 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() {

        var map = new google.maps.Map(document.getElementById('map'), {
          zoom: 1,
          center: {lat: 24.886, lng: -70.268},
          mapTypeId: 'terrain'
        });

        var blueCoords = [
          {lat: 25.774, lng: -60.190},
          {lat: 18.466, lng: -46.118},
          {lat: 32.321, lng: -44.757}
        ];

        var redCoords = [
          {lat: 25.774, lng: -80.190},
          {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: 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: map,
          paths: blueCoords,
          strokeColor: '#0000FF',
          strokeOpacity: 0.8,
          strokeWeight: 2,
          fillColor: '#0000FF',
          fillOpacity: 0.35,
          draggable: true,
          geodesic: false
        });
      }
    </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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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。