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

Navigation functions (heading)

This example demonstrates computing the heading between two coordinates using the Geometry library. Drag the markers on the map to see the origin, destination and heading change accordingly.

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">

var marker1, marker2;
var poly, geodesicPoly;

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 4,
    center: {lat: 34, lng: -40.605}
  });

  map.controls[google.maps.ControlPosition.TOP_CENTER].push(
      document.getElementById('info'));

  marker1 = new google.maps.Marker({
    map: map,
    draggable: true,
    position: {lat: 40.714, lng: -74.006}
  });

  marker2 = new google.maps.Marker({
    map: map,
    draggable: true,
    position: {lat: 48.857, lng: 2.352}
  });

  var bounds = new google.maps.LatLngBounds(
      marker1.getPosition(), marker2.getPosition());
  map.fitBounds(bounds);

  google.maps.event.addListener(marker1, 'position_changed', update);
  google.maps.event.addListener(marker2, 'position_changed', update);

  poly = new google.maps.Polyline({
    strokeColor: '#FF0000',
    strokeOpacity: 1.0,
    strokeWeight: 3,
    map: map,
  });

  geodesicPoly = new google.maps.Polyline({
    strokeColor: '#CC0099',
    strokeOpacity: 1.0,
    strokeWeight: 3,
    geodesic: true,
    map: map
  });

  update();
}

function update() {
  var path = [marker1.getPosition(), marker2.getPosition()];
  poly.setPath(path);
  geodesicPoly.setPath(path);
  var heading = google.maps.geometry.spherical.computeHeading(path[0], path[1]);
  document.getElementById('heading').value = heading;
  document.getElementById('origin').value = path[0].toString();
  document.getElementById('destination').value = path[1].toString();
}
<div id="map"></div>
<div id="floating-panel">
  Origin: <input type="text" readonly id="origin">
  Destination: <input type="text" readonly id="destination"><br>
  Heading: <input type="text" readonly id="heading"> degrees
</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;
}
<!-- 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>


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>Navigation functions (heading)</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <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;
      }
      #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;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <div id="floating-panel">
      Origin: <input type="text" readonly id="origin">
      Destination: <input type="text" readonly id="destination"><br>
      Heading: <input type="text" readonly id="heading"> degrees
    </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">

      var marker1, marker2;
      var poly, geodesicPoly;

      function initMap() {
        var map = new google.maps.Map(document.getElementById('map'), {
          zoom: 4,
          center: {lat: 34, lng: -40.605}
        });

        map.controls[google.maps.ControlPosition.TOP_CENTER].push(
            document.getElementById('info'));

        marker1 = new google.maps.Marker({
          map: map,
          draggable: true,
          position: {lat: 40.714, lng: -74.006}
        });

        marker2 = new google.maps.Marker({
          map: map,
          draggable: true,
          position: {lat: 48.857, lng: 2.352}
        });

        var bounds = new google.maps.LatLngBounds(
            marker1.getPosition(), marker2.getPosition());
        map.fitBounds(bounds);

        google.maps.event.addListener(marker1, 'position_changed', update);
        google.maps.event.addListener(marker2, 'position_changed', update);

        poly = new google.maps.Polyline({
          strokeColor: '#FF0000',
          strokeOpacity: 1.0,
          strokeWeight: 3,
          map: map,
        });

        geodesicPoly = new google.maps.Polyline({
          strokeColor: '#CC0099',
          strokeOpacity: 1.0,
          strokeWeight: 3,
          geodesic: true,
          map: map
        });

        update();
      }

      function update() {
        var path = [marker1.getPosition(), marker2.getPosition()];
        poly.setPath(path);
        geodesicPoly.setPath(path);
        var heading = google.maps.geometry.spherical.computeHeading(path[0], path[1]);
        document.getElementById('heading').value = heading;
        document.getElementById('origin').value = path[0].toString();
        document.getElementById('destination').value = path[1].toString();
      }
    </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