Keith PetersのBIT-101 Blogで配布されている画像等を魚眼レンズのように歪ませるカスタムクラスが手軽で面白い。例えばこの画像が

Hay Bails – Full Panoramic on Flickr – Photo Sharing!
こうなる。

歪ま…..

The other thing I noticed is that there is a Math.sqrt call in the loop. Is it possible to remove that? It would result in a big speed increase. Normally if I’m doing a distance check I’ll square the distance I’m comparing, like so:

dist = dx * dx + dy * dy;
if(dist > (inner * inner) && dist < (outer * outer))
{
etc.

I notice that you’re using the sqrt’d distance later on, so maybe not?

var optWidth:Number = Math.round(Math.min(cx * Math.PI * 2, 2880));
var scale:Number = optWidth / _source.width;

should make sure that the width is 2880 max. Then that scale figure is used to make the optHeight with the same aspect ratio as the original. So unless it is taller than wide, the height should never exceed 2880. Of course, it was an assumption on my part that people would use long, narrow images like panoramas exclusively. I guess I should fix that.

var optHeight = _source.height * scale;

Nik