Add ol.interaction.TouchPan

src/ol/interaction/touchinteraction.js

@@ -0,0 +1,119 @@
+
+goog.provide('ol.interaction.Touch');
+
+goog.require('goog.functions');
+goog.require('ol.MapBrowserEvent');
+goog.require('ol.MapBrowserEvent.EventType');
+goog.require('ol.Pixel');
+goog.require('ol.interaction.Interaction');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.interaction.Interaction}
+ */
+ol.interaction.Touch = function() {
+
+  goog.base(this);
+
+  /**
+   * @type {boolean}
+   * @private
+   */
+  this.handled_ = false;
+
+  /**
+   * @type {Object}
+   * @private
+   */
+  this.trackedTouches_ = {};
+
+  /**
+   * @type {Array.<Object>}
+   */
+  this.targetTouches = [];
+
+};
+goog.inherits(ol.interaction.Touch, ol.interaction.Interaction);
+
+
+/**
+ * @param {Array.<Object>} touches TouchEvents.
+ * @return {ol.Pixel} Centroid pixel.
+ */
+ol.interaction.Touch.centroid = function(touches) {
+  var length = touches.length;
+  var clientX = 0;
+  var clientY = 0;
+  for (var i = 0; i < length; i++) {
+    clientX += touches[i].clientX;
+    clientY += touches[i].clientY;
+  }
+  return new ol.Pixel(clientX / length, clientY / length);
+};
+
+
+/**
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Event.
+ * @private
+ */
+ol.interaction.Touch.prototype.updateTrackedTouches_ =
+    function(mapBrowserEvent) {
+  var event = mapBrowserEvent.browserEvent.getBrowserEvent();
+  if (goog.isDef(event.targetTouches)) {
+    // W3C touch events
+    this.targetTouches = event.targetTouches;
+  } else {
+    // IE pointer event
+    if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.TOUCHEND) {
+      delete this.trackedTouches_[event.pointerId];
+    } else {
+      this.trackedTouches_[event.pointerId] = event;
+    }
+    this.targetTouches = goog.object.getValues(this.trackedTouches_);
+  }
+};
+
+
+/**
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Event.
+ * @protected
+ */
+ol.interaction.Touch.prototype.handleTouchMove = goog.nullFunction;
+
+
+/**
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Event.
+ * @protected
+ * @return {boolean} Capture dragging.
+ */
+ol.interaction.Touch.prototype.handleTouchEnd = goog.functions.FALSE;
+
+
+/**
+ * @param {ol.MapBrowserEvent} mapBrowserEvent Event.
+ * @protected
+ * @return {boolean} Capture dragging.
+ */
+ol.interaction.Touch.prototype.handleTouchStart = goog.functions.FALSE;
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.Touch.prototype.handleMapBrowserEvent =
+    function(mapBrowserEvent) {
+  var browserEvent = mapBrowserEvent.browserEvent.getBrowserEvent();
+  this.updateTrackedTouches_(mapBrowserEvent);
+  if (this.handled_) {
+    if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.TOUCHMOVE) {
+      this.handleTouchMove(mapBrowserEvent);
+    } else if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.TOUCHEND) {
+      this.handled_ = this.handleTouchEnd(mapBrowserEvent);
+    }
+  }
+  if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.TOUCHSTART) {
+    this.handled_ = this.handleTouchStart(mapBrowserEvent);
+  }
+};

src/ol/interaction/touchpaninteraction.js

@@ -0,0 +1,109 @@
+// FIXME works for View2D only
+// FIXME opt_kinetic param
+goog.provide('ol.interaction.TouchPan');
+
+goog.require('goog.asserts');
+goog.require('ol.Coordinate');
+goog.require('ol.Kinetic');
+goog.require('ol.Pixel');
+goog.require('ol.View');
+goog.require('ol.ViewHint');
+goog.require('ol.interaction.Touch');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.interaction.Touch}
+ */
+ol.interaction.TouchPan = function() {
+
+  goog.base(this);
+
+  /**
+   * @private
+   * @type {ol.Kinetic}
+   */
+  this.kinetic_ = new ol.Kinetic(-0.005, 0.05, 100);
+
+  /**
+   * @type {ol.Pixel}
+   */
+  this.lastCentroid = null;
+
+};
+goog.inherits(ol.interaction.TouchPan, ol.interaction.Touch);
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.TouchPan.prototype.handleTouchMove = function(mapBrowserEvent) {
+  goog.asserts.assert(this.targetTouches.length >= 1);
+  var centroid = ol.interaction.Touch.centroid(this.targetTouches);
+  if (!goog.isNull(this.lastCentroid)) {
+    this.kinetic_.update(centroid.x, centroid.y);
+    var map = mapBrowserEvent.map;
+    var view = map.getView();
+    var resolution = view.getResolution();
+    var rotation = view.getRotation();
+    var center = view.getCenter();
+
+    var deltaX = this.lastCentroid.x - centroid.x;
+    var deltaY = centroid.y - this.lastCentroid.y;
+    var newCenter = new ol.Coordinate(deltaX, deltaY)
+      .scale(view.getResolution())
+      .rotate(view.getRotation());
+    // FIXME: nice to have center.add(...);
+    newCenter.x += center.x;
+    newCenter.y += center.y;
+    view.setCenter(newCenter);
+  }
+  this.lastCentroid = centroid;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.TouchPan.prototype.handleTouchEnd =
+    function(mapBrowserEvent) {
+  var map = mapBrowserEvent.map;
+  var view = map.getView();
+  if (this.targetTouches.length == 0) {
+    view.setHint(ol.ViewHint.PANNING, -1);
+    if (this.kinetic_.end()) {
+      var distance = this.kinetic_.getDistance();
+      var angle = this.kinetic_.getAngle();
+      var center = view.getCenter();
+      map.addPreRenderFunction(this.kinetic_.pan(center));
+      var centerpx = map.getPixelFromCoordinate(center);
+      var destpx = new ol.Pixel(
+          centerpx.x - distance * Math.cos(angle),
+          centerpx.y - distance * Math.sin(angle));
+      var dest = map.getCoordinateFromPixel(destpx);
+      view.setCenter(dest);
+    }
+    return false;
+  } else {
+    return true;
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.interaction.TouchPan.prototype.handleTouchStart =
+    function(mapBrowserEvent) {
+  if (this.targetTouches.length >= 1) {
+    var map = mapBrowserEvent.map;
+    var view = map.getView();
+    this.lastCentroid = null;
+    this.kinetic_.begin();
+    view.setHint(ol.ViewHint.PANNING, 1);
+    return true;
+  } else {
+    return false;
+  }
+};

src/ol/map.js

@@ -54,6 +54,7 @@ goog.require('ol.interaction.Interaction');
 goog.require('ol.interaction.KeyboardPan');
 goog.require('ol.interaction.KeyboardZoom');
 goog.require('ol.interaction.MouseWheelZoom');
+goog.require('ol.interaction.TouchPan');
 goog.require('ol.interaction.condition');
 goog.require('ol.layer.Layer');
 goog.require('ol.renderer.Map');
@@ -959,6 +960,12 @@ ol.Map.createInteractions_ = function(mapOptions) {
     interactions.push(new ol.interaction.DblClickZoom(zoomDelta));
   }
 
+  var touchPan = goog.isDef(mapOptions.touchPan) ?
+      mapOptions.touchPan : true;
+  if (touchPan) {
+    interactions.push(new ol.interaction.TouchPan());
+  }
+
   var dragPan = goog.isDef(mapOptions.dragPan) ?
       mapOptions.dragPan : true;
   if (dragPan) {