title: How to zoom a circular region with Cocos2d?
body: <p>I am working on a Cocos2d project for iPad and iPhone, and now I need to develop something that looks too small for iPhone.
  My first approach was to redesign it to make it possible to look bigger, but then I though that a region zoom effect would be great. The bad point is that I don't know how to do it... I really don't know what would be the correct/best approach to do it.</p>
  
  <p>I have already checked out the Cocos2D CCLens3D build in effect, but it doesn't give me the results I want.</p>
  
  <p>I would love to get the same result than when you long-press a textview/textfield on the UIKit:
  <img src="https://i.stack.imgur.com/oiVjE.png" alt="UITextField zoom"></p>
  
  <p>Thanks in advance for your help!</p>