title: making a hidden object game for android - need a way to define the "hid. objects" regardless of screen size
body: <p>I was told that I could use some sort of "getEdge()" and, define a hidden object as n% from one edge and n% from another. Could someone point me in the right direction to accomplish this?</p>
  
  <p>edit: This is a 2d game.</p>