title: SVG viewBox zoom in center (Raphael)
body: <p>I try to zoom with mousewheel on a Raphael paper using viewBox. <a href="http://jsfiddle.net/9zu4U/2/" rel="noreferrer">Here</a> is the JSFiddle code.</p>
  
  <p>it works but now i want to zoom in the center and i have no idea where to start. I guess i should change the viewBox x and y coordinates.
  I have tried this (in the function handle(delta)):</p>
  
  <pre><code>x = paper.width - viewBoxWidth;
  y = paper.height - viewBoxHeight;
  paper.setViewBox(x,y,viewBoxWidth,viewBoxHeight);
  </code></pre>
  
  <p>but didnt work. I would appreciate any help. Thank you!</p>