> I've put two images up at > http://www.abdn.ac.uk/~u07ih/staggered.png > & http://www.abdn.ac.uk/~u07ih/smooth.png > to show the two different types of tile layout style we can use. > I think we should use the staggered style, as it uses less memory and > fills into a rectangular area better. Oh, I forgot to say, but is slightly harder to lay out. iain