title: OpenSeadragon Dynamic Image
body: <p>I would like to create a tilesource for OpenSeadragon, to render a player's view for a game.
  The world has coordinates (x,y), player is on a particular coord, with a view range.</p>
  
  <p>What I would like is to create a tilesource for OpenSeadragon, that can display the whole view. At maximum zoom, 1 tile = 1 coord.
  So I have a few questions :
  How can I compute the maximum zoomlevel for player's view range ?
  How can I know the world positions I have to render in the tile that is requested by OpenSeadragon (x, y, level) ?</p>
  
  <p>Thanks :)</p>