OpenLayers 3 Beginner’s Guide

A sense of direction

Open sample in a new windows

<!doctype html>
<html>
  <head>
    <title>Map Examples</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
    <link rel="stylesheet" href="../assets/ol3/css/ol.css" type="text/css" />
    <link rel="stylesheet" href="../assets/css/samples.css" type="text/css" />
    <link href="//netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.css" rel="stylesheet">
  </head>
  <body>
    <div id="map" class="full-map"></div>
    <div id="location" class="marker"><span class="icon-arrow-up"></span></div>
    <script src="../assets/ol3/js/ol-debug.js"></script>
    <script>
      var layer = new ol.layer.Tile({
        source: new ol.source.OSM()
      });
      var london = ol.proj.transform([-0.12755, 51.507222], 'EPSG:4326', 'EPSG:3857');
      var view = new ol.View({
        center: london,
        zoom: 6
      });
      var map = new ol.Map({
        target: 'map',
        layers: [layer],
        view: view
      });
      // set up geolocation to track our position
      var geolocation = new ol.Geolocation({
        tracking: true
      });
      // bind it to the view's projection and update the view as we move
      geolocation.bindTo('projection', view);
      geolocation.on('change:position', function() {
        view.setCenter(geolocation.getPosition());
      });
      // add a marker to display the current location
      var marker = new ol.Overlay({
        element: document.getElementById('location'),
        positioning: 'center-center'
      });
      map.addOverlay(marker);
      // and bind it to the geolocation's position updates
      marker.bindTo('position', geolocation);

      // create a new device orientation object set to track the device
      var deviceOrientation = new ol.DeviceOrientation({
        tracking: true
      });
      // when the device changes heading, rotate the view so that
      // 'up' on the device points the direction we are facing
      deviceOrientation.on('change:heading', onChangeHeading);
      function onChangeHeading(event) {
        var heading = event.target.getHeading();
        view.setRotation(-heading);
      }
    </script>
  </body>
</html>