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

Rectangle Events

Read the documentation or view this example full screen.

// This example adds a user-editable rectangle to the map.
// When the user changes the bounds of the rectangle,
// an info window pops up displaying the new bounds.

var rectangle;
var map;
var infoWindow;

function initMap() {
  map = new google.maps.Map(document.getElementById('map'), {
    center: {lat: 44.5452, lng: -78.5389},
    zoom: 9
  });

  var bounds = {
    north: 44.599,
    south: 44.490,
    east: -78.443,
    west: -78.649
  };

  // Define the rectangle and set its editable property to true.
  rectangle = new google.maps.Rectangle({
    bounds: bounds,
    editable: true,
    draggable: true
  });

  rectangle.setMap(map);

  // Add an event listener on the rectangle.
  rectangle.addListener('bounds_changed', showNewRect);

  // Define an info window on the map.
  infoWindow = new google.maps.InfoWindow();
}
// Show the new coordinates for the rectangle in an info window.

/** @this {google.maps.Rectangle} */
function showNewRect(event) {
  var ne = rectangle.getBounds().getNorthEast();
  var sw = rectangle.getBounds().getSouthWest();

  var contentString = '<b>Rectangle moved.</b><br>' +
      'New north-east corner: ' + ne.lat() + ', ' + ne.lng() + '<br>' +
      'New south-west corner: ' + sw.lat() + ', ' + sw.lng();

  // Set the info window's content and position.
  infoWindow.setContent(contentString);
  infoWindow.setPosition(ne);

  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>

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>Rectangle Events</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 adds a user-editable rectangle to the map.
      // When the user changes the bounds of the rectangle,
      // an info window pops up displaying the new bounds.

      var rectangle;
      var map;
      var infoWindow;

      function initMap() {
        map = new google.maps.Map(document.getElementById('map'), {
          center: {lat: 44.5452, lng: -78.5389},
          zoom: 9
        });

        var bounds = {
          north: 44.599,
          south: 44.490,
          east: -78.443,
          west: -78.649
        };

        // Define the rectangle and set its editable property to true.
        rectangle = new google.maps.Rectangle({
          bounds: bounds,
          editable: true,
          draggable: true
        });

        rectangle.setMap(map);

        // Add an event listener on the rectangle.
        rectangle.addListener('bounds_changed', showNewRect);

        // Define an info window on the map.
        infoWindow = new google.maps.InfoWindow();
      }
      // Show the new coordinates for the rectangle in an info window.

      /** @this {google.maps.Rectangle} */
      function showNewRect(event) {
        var ne = rectangle.getBounds().getNorthEast();
        var sw = rectangle.getBounds().getSouthWest();

        var contentString = '<b>Rectangle moved.</b><br>' +
            'New north-east corner: ' + ne.lat() + ', ' + ne.lng() + '<br>' +
            'New south-west corner: ' + sw.lat() + ', ' + sw.lng();

        // Set the info window's content and position.
        infoWindow.setContent(contentString);
        infoWindow.setPosition(ne);

        infoWindow.open(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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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。