From b7f199c8cd77ea5e07eef3dba9d622614cdf2066 Mon Sep 17 00:00:00 2001
From: Tim Schaub <tim.schaub@gmail.com>
Date: Tue, 8 Sep 2015 23:07:47 -0600
Subject: [PATCH] Zoom to the extent of the drag box

---
 src/ol/interaction/dragzoominteraction.js | 35 +++++++++++++++++++----
 1 file changed, 29 insertions(+), 6 deletions(-)

diff --git a/src/ol/interaction/dragzoominteraction.js b/src/ol/interaction/dragzoominteraction.js
index 30398002c6..83e82cafdf 100644
--- a/src/ol/interaction/dragzoominteraction.js
+++ b/src/ol/interaction/dragzoominteraction.js
@@ -1,10 +1,11 @@
 goog.provide('ol.interaction.DragZoom');
 
 goog.require('goog.asserts');
+goog.require('ol.animation');
+goog.require('ol.easing');
 goog.require('ol.events.condition');
 goog.require('ol.extent');
 goog.require('ol.interaction.DragBox');
-goog.require('ol.interaction.Interaction');
 goog.require('ol.style.Stroke');
 goog.require('ol.style.Style');
 
@@ -58,13 +59,35 @@ goog.inherits(ol.interaction.DragZoom, ol.interaction.DragBox);
  */
 ol.interaction.DragZoom.prototype.onBoxEnd = function() {
   var map = this.getMap();
+
   var view = map.getView();
   goog.asserts.assert(!goog.isNull(view), 'view should not be null');
-  var extent = this.getGeometry().getExtent();
-  var center = ol.extent.getCenter(extent);
+
   var size = map.getSize();
   goog.asserts.assert(goog.isDef(size), 'size should be defined');
-  ol.interaction.Interaction.zoom(map, view,
-      view.getResolutionForExtent(extent, size),
-      center, this.duration_);
+
+  var extent = this.getGeometry().getExtent();
+
+  var resolution = view.constrainResolution(
+      view.getResolutionForExtent(extent, size));
+
+  var currentResolution = view.getResolution();
+  goog.asserts.assert(goog.isDef(currentResolution), 'res should be defined');
+
+  var currentCenter = view.getCenter();
+  goog.asserts.assert(goog.isDef(currentCenter), 'center should be defined');
+
+  map.beforeRender(ol.animation.zoom({
+    resolution: currentResolution,
+    duration: this.duration_,
+    easing: ol.easing.easeOut
+  }));
+  map.beforeRender(ol.animation.pan({
+    source: currentCenter,
+    duration: this.duration_,
+    easing: ol.easing.easeOut
+  }));
+
+  view.setCenter(ol.extent.getCenter(extent));
+  view.setResolution(resolution);
 };