I’m using openFrameworks for an iPhone app I’ve been working on. I tried to write it in objective-c using Core Graphics but it didn’t seem to be fast enough. I don’t really feel like tackling openGL (yet) so openFrameworks is perfect.
By dragging your fingers over the screen, you can change parameters of the curve being generated.
http://vimeo.com/18444749 (aspect ratio is 9:16, the forum-embedder stretches it back to 4:3)