openlayers/examples/feature-move-animation.js

Build tools and sources for developing OpenLayers based mapping applications

goog.require('ol.Feature');
goog.require('ol.Map');
goog.require('ol.View');
goog.require('ol.format.Polyline');
goog.require('ol.geom.Point');
goog.require('ol.layer.Tile');
goog.require('ol.layer.Vector');
goog.require('ol.source.BingMaps');
goog.require('ol.source.Vector');
goog.require('ol.style.Circle');
goog.require('ol.style.Fill');
goog.require('ol.style.Icon');
goog.require('ol.style.Stroke');
goog.require('ol.style.Style');

// This long string is placed here due to jsFiddle limitations.
// It is usually loaded with AJAX.
var polyline = [
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  '_}D~NgY`\\um@v[gm@v{Cw`G`w@o{AdjAwzBh{C}`Gpp@ypAxn@}mAfz@{bBbNia@??jI',
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].join('');

var route = /** @type {ol.geom.LineString} */ (new ol.format.Polyline({
  factor: 1e6
}).readGeometry(polyline, {
  dataProjection: 'EPSG:4326',
  featureProjection: 'EPSG:3857'
}));

var routeCoords = route.getCoordinates();
var routeLength = routeCoords.length;

var routeFeature = new ol.Feature({
  type: 'route',
  geometry: route
});
var geoMarker = new ol.Feature({
  type: 'geoMarker',
  geometry: new ol.geom.Point(routeCoords[0])
});
var startMarker = new ol.Feature({
  type: 'icon',
  geometry: new ol.geom.Point(routeCoords[0])
});
var endMarker = new ol.Feature({
  type: 'icon',
  geometry: new ol.geom.Point(routeCoords[routeLength - 1])
});

var styles = {
  'route': new ol.style.Style({
    stroke: new ol.style.Stroke({
      width: 6, color: [237, 212, 0, 0.8]
    })
  }),
  'icon': new ol.style.Style({
    image: new ol.style.Icon({
      anchor: [0.5, 1],
      src: 'data/icon.png'
    })
  }),
  'geoMarker': new ol.style.Style({
    image: new ol.style.Circle({
      radius: 7,
      snapToPixel: false,
      fill: new ol.style.Fill({color: 'black'}),
      stroke: new ol.style.Stroke({
        color: 'white', width: 2
      })
    })
  })
};

var animating = false;
var speed, now;
var speedInput = document.getElementById('speed');
var startButton = document.getElementById('start-animation');

var vectorLayer = new ol.layer.Vector({
  source: new ol.source.Vector({
    features: [routeFeature, geoMarker, startMarker, endMarker]
  }),
  style: function(feature) {
    // hide geoMarker if animation is active
    if (animating && feature.get('type') === 'geoMarker') {
      return null;
    }
    return styles[feature.get('type')];
  }
});

var center = [-5639523.95, -3501274.52];
var map = new ol.Map({
  target: document.getElementById('map'),
  loadTilesWhileAnimating: true,
  view: new ol.View({
    center: center,
    zoom: 10,
    minZoom: 2,
    maxZoom: 19
  }),
  layers: [
    new ol.layer.Tile({
      source: new ol.source.BingMaps({
        imagerySet: 'AerialWithLabels',
        key: 'As1HiMj1PvLPlqc_gtM7AqZfBL8ZL3VrjaS3zIb22Uvb9WKhuJObROC-qUpa81U5'
      })
    }),
    vectorLayer
  ]
});

var moveFeature = function(event) {
  var vectorContext = event.vectorContext;
  var frameState = event.frameState;

  if (animating) {
    var elapsedTime = frameState.time - now;
    // here the trick to increase speed is to jump some indexes
    // on lineString coordinates
    var index = Math.round(speed * elapsedTime / 1000);

    if (index >= routeLength) {
      stopAnimation(true);
      return;
    }

    var currentPoint = new ol.geom.Point(routeCoords[index]);
    var feature = new ol.Feature(currentPoint);
    vectorContext.drawFeature(feature, styles.geoMarker);
  }
  // tell OpenLayers to continue the postcompose animation
  map.render();
};

function startAnimation() {
  if (animating) {
    stopAnimation(false);
  } else {
    animating = true;
    now = new Date().getTime();
    speed = speedInput.value;
    startButton.textContent = 'Cancel Animation';
    // hide geoMarker
    geoMarker.setStyle(null);
    // just in case you pan somewhere else
    map.getView().setCenter(center);
    map.on('postcompose', moveFeature);
    map.render();
  }
}


/**
 * @param {boolean} ended end of animation.
 */
function stopAnimation(ended) {
  animating = false;
  startButton.textContent = 'Start Animation';

  // if animation cancelled set the marker at the beginning
  var coord = ended ? routeCoords[routeLength - 1] : routeCoords[0];
  /** @type {ol.geom.Point} */ (geoMarker.getGeometry())
      .setCoordinates(coord);
  //remove listener
  map.un('postcompose', moveFeature);
}

startButton.addEventListener('click', startAnimation, false);