Es kann losgehen!

Bevor Sie mit der Entwicklung beginnen, lesen Sie bitte unsere Entwicklerdokumentation.

Die Google Maps JavaScript API aktivieren

Zum Einstieg führen wir Sie durch die Google Developers Console, wo Sie vorab Folgendes tun müssen:

  1. Ein Projekt erstellen oder auswählen
  2. Die Google Maps JavaScript API und zugehörige Dienste aktivieren
  3. Zugehörige Schlüssel erstellen
Weiter

Showing pixel and tile coordinates

Read the documentation or view this example full screen.

function initMap() {
  var chicago = new google.maps.LatLng(41.850, -87.650);

  var map = new google.maps.Map(document.getElementById('map'), {
    center: chicago,
    zoom: 3
  });

  var coordInfoWindow = new google.maps.InfoWindow();
  coordInfoWindow.setContent(createInfoWindowContent(chicago, map.getZoom()));
  coordInfoWindow.setPosition(chicago);
  coordInfoWindow.open(map);

  map.addListener('zoom_changed', function() {
    coordInfoWindow.setContent(createInfoWindowContent(chicago, map.getZoom()));
    coordInfoWindow.open(map);
  });
}

var TILE_SIZE = 256;

function createInfoWindowContent(latLng, zoom) {
  var scale = 1 << zoom;

  var worldCoordinate = project(latLng);

  var pixelCoordinate = new google.maps.Point(
      Math.floor(worldCoordinate.x * scale),
      Math.floor(worldCoordinate.y * scale));

  var tileCoordinate = new google.maps.Point(
      Math.floor(worldCoordinate.x * scale / TILE_SIZE),
      Math.floor(worldCoordinate.y * scale / TILE_SIZE));

  return [
    'Chicago, IL',
    'LatLng: ' + latLng,
    'Zoom level: ' + zoom,
    'World Coordinate: ' + worldCoordinate,
    'Pixel Coordinate: ' + pixelCoordinate,
    'Tile Coordinate: ' + tileCoordinate
  ].join('<br>');
}

// The mapping between latitude, longitude and pixels is defined by the web
// mercator projection.
function project(latLng) {
  var siny = Math.sin(latLng.lat() * Math.PI / 180);

  // Truncating to 0.9999 effectively limits latitude to 89.189. This is
  // about a third of a tile past the edge of the world tile.
  siny = Math.min(Math.max(siny, -0.9999), 0.9999);

  return new google.maps.Point(
      TILE_SIZE * (0.5 + latLng.lng() / 360),
      TILE_SIZE * (0.5 - Math.log((1 + siny) / (1 - siny)) / (4 * Math.PI)));
}
<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>


Probieren Sie es selbst aus

Bewegen Sie die Maus oben rechts über den Codeblock, um den Code zu kopieren, oder öffnen Sie ihn in JSFiddle.

<!DOCTYPE html>
<html>
  <head>
    <title>Showing pixel and tile coordinates</title>
    <meta name="viewport" content="initial-scale=1.0">
    <meta charset="utf-8">
    <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>
      function initMap() {
        var chicago = new google.maps.LatLng(41.850, -87.650);

        var map = new google.maps.Map(document.getElementById('map'), {
          center: chicago,
          zoom: 3
        });

        var coordInfoWindow = new google.maps.InfoWindow();
        coordInfoWindow.setContent(createInfoWindowContent(chicago, map.getZoom()));
        coordInfoWindow.setPosition(chicago);
        coordInfoWindow.open(map);

        map.addListener('zoom_changed', function() {
          coordInfoWindow.setContent(createInfoWindowContent(chicago, map.getZoom()));
          coordInfoWindow.open(map);
        });
      }

      var TILE_SIZE = 256;

      function createInfoWindowContent(latLng, zoom) {
        var scale = 1 << zoom;

        var worldCoordinate = project(latLng);

        var pixelCoordinate = new google.maps.Point(
            Math.floor(worldCoordinate.x * scale),
            Math.floor(worldCoordinate.y * scale));

        var tileCoordinate = new google.maps.Point(
            Math.floor(worldCoordinate.x * scale / TILE_SIZE),
            Math.floor(worldCoordinate.y * scale / TILE_SIZE));

        return [
          'Chicago, IL',
          'LatLng: ' + latLng,
          'Zoom level: ' + zoom,
          'World Coordinate: ' + worldCoordinate,
          'Pixel Coordinate: ' + pixelCoordinate,
          'Tile Coordinate: ' + tileCoordinate
        ].join('<br>');
      }

      // The mapping between latitude, longitude and pixels is defined by the web
      // mercator projection.
      function project(latLng) {
        var siny = Math.sin(latLng.lat() * Math.PI / 180);

        // Truncating to 0.9999 effectively limits latitude to 89.189. This is
        // about a third of a tile past the edge of the world tile.
        siny = Math.min(Math.max(siny, -0.9999), 0.9999);

        return new google.maps.Point(
            TILE_SIZE * (0.5 + latLng.lng() / 360),
            TILE_SIZE * (0.5 - Math.log((1 + siny) / (1 - siny)) / (4 * Math.PI)));
      }
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
    </script>
  </body>
</html>

Feedback geben zu...

Google Maps JavaScript API
Google Maps JavaScript API