Add ol.View2D.pan

src/ol/view2d.js

@@ -16,6 +16,7 @@ goog.require('ol.RotationConstraint');
 goog.require('ol.Size');
 goog.require('ol.View');
 goog.require('ol.animation');
+goog.require('ol.easing');
 goog.require('ol.projection');
 
 
@@ -255,6 +256,26 @@ goog.exportProperty(
     ol.View2D.prototype.setRotation);
 
 
+/**
+ * @param {ol.Map} map Map.
+ * @param {ol.Coordinate} delta Delta.
+ * @param {number=} opt_duration Duration.
+ */
+ol.View2D.prototype.pan = function(map, delta, opt_duration) {
+  var currentCenter = this.getCenter();
+  if (goog.isDef(currentCenter) && goog.isDef(opt_duration)) {
+    map.requestRenderFrame();
+    map.addPreRenderFunction(ol.animation.pan({
+      source: currentCenter,
+      duration: opt_duration,
+      easing: ol.easing.linear
+    }));
+    this.setCenter(new ol.Coordinate(
+        currentCenter.x + delta.x, currentCenter.y + delta.y));
+  }
+};
+
+
 /**
  * @param {ol.Map} map Map.
  * @param {number|undefined} rotation Rotation.