added oldWidth and oldHeight to resize event

HISTORY.md

@@ -14,6 +14,7 @@ http://visjs.org
 - Fixed node label becoming undefined.
 - Fixed cluster fontsize scaling.
 - Fixed cluster sector scaling.
+- Added oldHeight and oldWidth to resize event.
 
 ### Timeline
 

docs/network.html

@@ -2429,6 +2429,8 @@ network.off('select', onSelect);
       <ul>
         <li><code>width</code>: the new width of the canvas</li>
         <li><code>height</code>: the new height of the canvas</li>
+        <li><code>oldWidth</code>: the old width of the canvas</li>
+        <li><code>oldHeight</code>: the old height of the canvas</li>
       </ul>
     </td>
   </tr>

lib/network/Network.js

@@ -1296,6 +1296,8 @@ Network.prototype._checkHidePopup = function (pointer) {
  */
 Network.prototype.setSize = function(width, height) {
   var emitEvent = false;
+  var oldWidth = this.frame.canvas.width;
+  var oldHeight = this.frame.canvas.height;
   if (width != this.constants.width || height != this.constants.height || this.frame.style.width != width || this.frame.style.height != height) {
     this.frame.style.width = width;
     this.frame.style.height = height;
@@ -1326,7 +1328,7 @@ Network.prototype.setSize = function(width, height) {
   }
 
   if (emitEvent == true) {
-    this.emit('resize', {width:this.frame.canvas.width,height:this.frame.canvas.height});
+    this.emit('resize', {width:this.frame.canvas.width,height:this.frame.canvas.height, oldWidth: oldWidth, oldHeight: oldHeight});
   }
 };