title: manage artwork game data for iphone/ipad/osx
body: <p>I looked for some hours, can't seem to find it anymore. There is a term for using some kind of a "artmap" for loading graphic parts inside your app?</p>
  
  <p>For example, i make one file (jpg/tif/png?) with different buttons and other  visual items. Then i 'copy' just a specific rect from the 'map' and use it as a button, title whatever.</p>
  
  <p>I'm looking for some info, and pointers how to implement with cocoa (iphone, ipad, osx).</p>
  
  <p>Thanks!</p>