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

Overlays within Street View

Read the documentation or view this example full screen.

var panorama;

function initMap() {
  var astorPlace = {lat: 40.729884, lng: -73.990988};

  // Set up the map
  var map = new google.maps.Map(document.getElementById('map'), {
    center: astorPlace,
    zoom: 18,
    streetViewControl: false
  });

  // Set up the markers on the map
  var cafeMarker = new google.maps.Marker({
      position: {lat: 40.730031, lng: -73.991428},
      map: map,
      icon: 'https://chart.apis.google.com/chart?chst=d_map_pin_icon&chld=cafe|FFFF00',
      title: 'Cafe'
  });

  var bankMarker = new google.maps.Marker({
      position: {lat: 40.729681, lng: -73.991138},
      map: map,
      icon: 'https://chart.apis.google.com/chart?chst=d_map_pin_icon&chld=dollar|FFFF00',
      title: 'Bank'
  });

  var busMarker = new google.maps.Marker({
      position: {lat: 40.729559, lng: -73.990741},
      map: map,
      icon: 'https://chart.apis.google.com/chart?chst=d_map_pin_icon&chld=bus|FFFF00',
      title: 'Bus Stop'
  });

  // We get the map's default panorama and set up some defaults.
  // Note that we don't yet set it visible.
  panorama = map.getStreetView();
  panorama.setPosition(astorPlace);
  panorama.setPov(/** @type {google.maps.StreetViewPov} */({
    heading: 265,
    pitch: 0
  }));
}

function toggleStreetView() {
  var toggle = panorama.getVisible();
  if (toggle == false) {
    panorama.setVisible(true);
  } else {
    panorama.setVisible(false);
  }
}
<div id="floating-panel">
  <input type="button" value="Toggle Street View" onclick="toggleStreetView();"></input>
</div>
<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;
}
#floating-panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
  font-family: 'Roboto','sans-serif';
  line-height: 30px;
  padding-left: 10px;
}
#floating-panel {
  margin-left: -100px;
}
 <!-- 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 charset="utf-8">
    <title>Overlays within Street View</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;
      }
      #floating-panel {
        position: absolute;
        top: 10px;
        left: 25%;
        z-index: 5;
        background-color: #fff;
        padding: 5px;
        border: 1px solid #999;
        text-align: center;
        font-family: 'Roboto','sans-serif';
        line-height: 30px;
        padding-left: 10px;
      }
      #floating-panel {
        margin-left: -100px;
      }
    </style>
  </head>
  <body>
    <div id="floating-panel">
      <input type="button" value="Toggle Street View" onclick="toggleStreetView();"></input>
    </div>
    <div id="map"></div>
    <script>
      var panorama;

      function initMap() {
        var astorPlace = {lat: 40.729884, lng: -73.990988};

        // Set up the map
        var map = new google.maps.Map(document.getElementById('map'), {
          center: astorPlace,
          zoom: 18,
          streetViewControl: false
        });

        // Set up the markers on the map
        var cafeMarker = new google.maps.Marker({
            position: {lat: 40.730031, lng: -73.991428},
            map: map,
            icon: 'https://chart.apis.google.com/chart?chst=d_map_pin_icon&chld=cafe|FFFF00',
            title: 'Cafe'
        });

        var bankMarker = new google.maps.Marker({
            position: {lat: 40.729681, lng: -73.991138},
            map: map,
            icon: 'https://chart.apis.google.com/chart?chst=d_map_pin_icon&chld=dollar|FFFF00',
            title: 'Bank'
        });

        var busMarker = new google.maps.Marker({
            position: {lat: 40.729559, lng: -73.990741},
            map: map,
            icon: 'https://chart.apis.google.com/chart?chst=d_map_pin_icon&chld=bus|FFFF00',
            title: 'Bus Stop'
        });

        // We get the map's default panorama and set up some defaults.
        // Note that we don't yet set it visible.
        panorama = map.getStreetView();
        panorama.setPosition(astorPlace);
        panorama.setPov(/** @type {google.maps.StreetViewPov} */({
          heading: 265,
          pitch: 0
        }));
      }

      function toggleStreetView() {
        var toggle = panorama.getVisible();
        if (toggle == false) {
          panorama.setVisible(true);
        } else {
          panorama.setVisible(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。