From 3ba9a4afd4779c40d9a38fdb6cdbceb60bc52dd2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89ric=20Lemoine?= <eric.lemoine@gmail.com>
Date: Wed, 20 Feb 2013 16:51:48 +0100
Subject: [PATCH] View2D zoom may animate pan

---
 src/ol/view2d.js | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/ol/view2d.js b/src/ol/view2d.js
index 9f8a82db1c..2fcc1f9016 100644
--- a/src/ol/view2d.js
+++ b/src/ol/view2d.js
@@ -4,6 +4,7 @@
 goog.provide('ol.View2D');
 goog.provide('ol.View2DProperty');
 
+goog.require('goog.fx.easing');
 goog.require('ol.Constraints');
 goog.require('ol.Coordinate');
 goog.require('ol.Extent');
@@ -312,12 +313,22 @@ ol.View2D.prototype.zoom_ = function(map, resolution, opt_anchor) {
  */
 ol.View2D.prototype.zoom = function(map, delta, opt_anchor, opt_duration) {
   var currentResolution = this.getResolution();
-  if (goog.isDef(currentResolution) && goog.isDef(opt_duration)) {
+  var currentCenter = this.getCenter();
+  if (goog.isDef(currentResolution) && goog.isDef(currentCenter) &&
+      goog.isDef(opt_duration)) {
     map.requestRenderFrame();
     map.addPreRenderFunction(ol.animation.zoom({
       resolution: currentResolution,
-      duration: opt_duration
+      duration: opt_duration,
+      easing: goog.fx.easing.easeOut
     }));
+    if (goog.isDef(opt_anchor)) {
+      map.addPreRenderFunction(ol.animation.pan({
+        source: currentCenter,
+        duration: opt_duration,
+        easing: goog.fx.easing.easeOut
+      }));
+    }
   }
   var resolution = this.constraints_.resolution(currentResolution, delta);
   this.zoom_(map, resolution, opt_anchor);