Device Orientation

Copy
<!DOCTYPE html>
<html>
  <head>
    <title>Device Orientation</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <script src="https://unpkg.com/gyronorm@2.0.6/dist/gyronorm.complete.min.js"></script>
  </head>
  <body>
    <div id="map" class="map"></div>
    <p>
      <div>α : <code id="alpha"></code></div>
      <div>β : <code id="beta"></code></div>
      <div>γ : <code id="gamma"></code></div>
    </p>
    <script>
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import TileLayer from 'ol/layer/Tile.js';
      import {toRadians} from 'ol/math.js';
      import OSM from 'ol/source/OSM.js';

      var view = new View({
        center: [0, 0],
        zoom: 2
      });
      var map = new Map({
        layers: [
          new TileLayer({
            source: new OSM()
          })
        ],
        target: 'map',
        view: view
      });

      function el(id) {
        return document.getElementById(id);
      }


      var gn = new GyroNorm();

      gn.init().then(function() {
        gn.start(function(event) {
          var center = view.getCenter();
          var resolution = view.getResolution();
          var alpha = toRadians(event.do.beta);
          var beta = toRadians(event.do.beta);
          var gamma = toRadians(event.do.gamma);

          el('alpha').innerText = alpha + ' [rad]';
          el('beta').innerText = beta + ' [rad]';
          el('gamma').innerText = gamma + ' [rad]';

          center[0] -= resolution * gamma * 25;
          center[1] += resolution * beta * 25;

          view.setCenter(view.constrainCenter(center));
        });
      });
    </script>
  </body>
</html>