title: Manipulating image by touch : IOS
body: <p>I want to make a simple html page with just a single image on it. Then make this image become pinchable. 
  I want to rotate it and zoom it in and out.
  It may snap back to its original position when I release it.</p>
  
  <p>i need code snippets that don't use any existing Javascript libraries for this – no jQuery, no Zepto, etc... it only needs to work in webkit-based browsers, but it MUST work on iOS.</p>
  
  <p>Any recommandation or Key words that could be helpful to start with are appreciated.</p>