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diff --git a/src/svgpan.js b/src/svgpan.js
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+/**
+ * The code below is based on SVGPan Library 1.2 and was modified for doxygen
+ *
+ * This code is licensed under the following BSD license:
+ *
+ * Copyright 2009-2010 Andrea Leofreddi <a.leofreddi@itcharm.com>. All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ * 
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ * 
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY Andrea Leofreddi ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL Andrea Leofreddi OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of Andrea Leofreddi.
+ */
+
+var root = document.documentElement;
+var state = 'none';
+var stateOrigin;
+var stateTf = root.createSVGMatrix();
+var cursorGrab = ' url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA4AAAAOCAMAAAAolt3jAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAAlQTFRFAAAA////////c3ilYwAAAAN0Uk5T//8A18oNQQAAAD1JREFUeNp0zlEKACAIA9Bt9z90bZBZkQj29qFBEuBOzQHSnWTTyckEfqUuZgFvslH4ch3qLCO/Kr8cAgwATw4Ax6XRCcoAAAAASUVORK5CYII="), move';
+var zoomSteps = 10;
+var zoomInFactor;
+var zoomOutFactor;
+var windowWidth;
+var windowHeight;
+var svgDoc;
+var minZoom;
+var maxZoom;
+if (!window) window=this;
+
+/**
+ * Register handlers
+ */
+function init(evt) 
+{
+  svgDoc = evt.target.ownerDocument;
+  if (window.innerHeight) // Firefox
+  {
+    windowWidth = window.innerWidth;
+    windowHeight = window.innerHeight;
+  }
+  else if (document.documentElement.clientWidth) // Chrome/Safari
+  {
+    windowWidth = document.documentElement.clientWidth
+    windowHeight = document.documentElement.clientHeight
+  }
+  else
+  {
+    windowWidth = 800;
+    windowHeight = 600;
+  }
+  minZoom = windowHeight/viewHeight;
+  maxZoom = 1.5;
+  zoomInFactor = Math.pow(maxZoom/minZoom,1.0/zoomSteps);
+  zoomOutFactor = 1.0/zoomInFactor;
+
+  var g = svgDoc.getElementById('viewport');
+  var bb = g.getBBox();
+  var a = 'scale('+minZoom+') rotate(0) translate('+((innerWidth-viewWidth*minZoom)/(2*minZoom))+' '+viewHeight+')';
+
+  g.setAttribute('transform',a);
+
+  setAttributes(root, {
+     "onmousedown" : "handleMouseDown(evt)",
+     "onmousemove" : "handleMouseMove(evt)",
+     "onmouseup"   : "handleMouseUp(evt)"
+  });
+
+  if (window.addEventListener)
+  {
+    if (navigator.userAgent.toLowerCase().indexOf('webkit') >= 0 || navigator.userAgent.toLowerCase().indexOf("opera") >= 0)
+      window.addEventListener('mousewheel', handleMouseWheel, false); // Chrome/Safari
+    else
+      window.addEventListener('DOMMouseScroll', handleMouseWheel, false); // Others
+  }
+}
+
+window.onresize=function()
+{
+  if (svgDoc)
+  {
+    var newWindowWidth;
+    if (window.innerWidth) // Firefox
+    {
+      newWindowWidth = window.innerWidth;
+    }
+    else if (document.documentElement.clientWidth) // Chrome/Safari
+    {
+      newWindowWidth = document.documentElement.clientWidth
+    }
+    if (newWindowWidth)
+    {
+      var g = svgDoc.getElementById("viewport");
+      var n = g.getCTM();
+      n = n.translate((newWindowWidth-windowWidth)/(2*minZoom),0);
+      setCTM(g, n);
+      stateTf = stateTf.multiply(n.inverse());
+      windowWidth = newWindowWidth;
+    }
+  }
+}
+
+/**
+ * Instance an SVGPoint object with given event coordinates.
+ */
+function getEventPoint(evt) 
+{
+  var p = root.createSVGPoint();
+  p.x = evt.clientX;
+  p.y = evt.clientY;
+  return p;
+}
+
+/**
+ * Sets the current transform matrix of an element.
+ */
+function setCTM(element, matrix) 
+{
+  var s = "matrix(" + matrix.a + "," + matrix.b + "," + matrix.c + "," + matrix.d + "," + matrix.e + "," + matrix.f + ")";
+  element.setAttribute("transform", s);
+}
+
+/**
+ * Sets attributes of an element.
+ */
+function setAttributes(element, attributes)
+{
+  for (i in attributes)
+    element.setAttributeNS(null, i, attributes[i]);
+}
+
+function doZoom(g,point,zoomFactor)
+{
+  var p = point.matrixTransform(g.getCTM().inverse());
+  var k = root.createSVGMatrix().translate(p.x, p.y).scale(zoomFactor).translate(-p.x, -p.y);
+  var n = g.getCTM().multiply(k);
+  var s = Math.max(n.a,n.d);
+  if      (s>maxZoom) n=n.translate(p.x,p.y).scale(maxZoom/s).translate(-p.x,-p.y);
+  else if (s<minZoom) n=n.translate(p.x,p.y).scale(minZoom/s).translate(-p.x,-p.y);
+  setCTM(g, n);
+  stateTf = stateTf.multiply(n.inverse());
+}
+
+/**
+ * Handle mouse move event.
+ */
+function handleMouseWheel(evt) 
+{
+  if (!evt) evt = window.evt;
+  if (evt.preventDefault) evt.preventDefault();
+  evt.returnValue = false;
+
+  if (state!='pan')
+  {
+
+    var delta;
+
+    if(evt.wheelDelta)
+    {
+      if (window.opera)
+      {
+        delta = evt.wheelDelta / 720; // Opera
+      }
+      else
+      {
+        delta = evt.wheelDelta / 7200; // Chrome/Safari/Opera
+      }
+    }
+    else
+    {
+      delta = evt.detail / -180; // Mozilla
+    }
+
+    var svgDoc = evt.target.ownerDocument;
+    var g = svgDoc.getElementById("viewport");
+    var p = getEventPoint(evt);
+    doZoom(g,p,1+delta);
+  }
+}
+
+/**
+ * Handle mouse move event.
+ */
+function handleMouseMove(evt) 
+{
+  if(evt.preventDefault)
+    evt.preventDefault();
+
+  evt.returnValue = false;
+
+  var g = svgDoc.getElementById("viewport");
+
+  if (state == 'pan') 
+  {
+    // Pan mode
+    var p = getEventPoint(evt).matrixTransform(stateTf);
+    setCTM(g,stateTf.inverse().translate(p.x - stateOrigin.x, p.y - stateOrigin.y));
+  } 
+}
+
+/**
+ * Handle click event.
+ */
+function handleMouseDown(evt) 
+{
+  if(evt.preventDefault)
+    evt.preventDefault();
+  evt.returnValue = false;
+  var g = svgDoc.getElementById("viewport");
+  state = 'pan';
+  stateTf = g.getCTM().inverse();
+  stateOrigin = getEventPoint(evt).matrixTransform(stateTf);
+  g.style.cursor = cursorGrab;
+}
+
+/**
+ * Handle mouse button release event.
+ */
+function handleMouseUp(evt) 
+{
+  if (evt.preventDefault) evt.preventDefault();
+  evt.returnValue = false;
+  var g = svgDoc.getElementById("viewport");
+  g.style.cursor = "default";
+  // Quit pan mode
+  state = '';
+}
+
+function handlePan(x,y)
+{
+  var g = svgDoc.getElementById("viewport");
+  setCTM(g,g.getCTM().translate(x*20/minZoom,y*20/minZoom));
+}
+
+/**
+ * Dumps a matrix to a string (useful for debug).
+ */
+function dumpMatrix(matrix) 
+{
+  var s = "[ " + matrix.a + ", " + matrix.c + ", " + matrix.e + "\n  " + matrix.b + ", " + matrix.d + ", " + matrix.f + "\n  0, 0, 1 ]";
+  return s;
+}
+
+function handleZoom(evt,direction)
+{
+  var g = svgDoc.getElementById("viewport");
+  var factor = direction=='in' ? zoomInFactor : zoomOutFactor;
+  var m = g.getCTM();
+  var p = root.createSVGPoint();
+  p.x = windowWidth/2; 
+  p.y = windowHeight/2;
+  doZoom(g,p,factor);
+}
+