title: Pinch/zoom scroll around image on mobile
body: <p>I've searched around for lots of different jQuery libraries to add pinch/zoom functionality for mobile devices (like <a href="https://github.com/HotStudio/touchy" rel="nofollow">touchy.js</a>, <a href="http://photoswipe.com/" rel="nofollow">PhotoSwipe</a>, <a href="http://labs.rampinteractive.co.uk/touchSwipe/demos/index.html" rel="nofollow">TouchSwipe</a>, <a href="http://hammerjs.github.io/" rel="nofollow">hammer.js</a> etc.) but I don't know what I should be looking for to solve this particular issue.</p>
  
  <p>I need to create a simple game, very similar to "Where's Waldo?", where the user is giving a large image to scroll around (almost like Google maps), trying to find an item. When they find it, I need to take their "tap" co-ords -- taking into account the zoom level -- and see if they're right.</p>
  
  <p>I feel like there's probably a library somewhere that already does 90% of what I need out of the box, but I don't know what this functionality is called. Is there such a library for this functionality? </p>