I want the user to be able to take a photo and fit it in a mask with pan/tilt/zoom.

What would be the good way to do that ?

Here is an example of what I am talking about: http://images.macworld.com/appguide/imag...23/ss1.jpg

I'm sorry, I may not be expressing myself really well.. It may explains why I can't find anything searching google

Thanks,
--Ben

I think I see what you're saying. You want the user to be able to drag, rotate, and scale the picture underneath the fixed-in-place mask to center it as best they can, right?

This is more of a technical question than a design question, so aside from possibly moving this thread, we'll need some more technical details to be able to give a useful answer. Are you writing for the Mac or iPhone? Using OpenGL, Quartz, or something else for graphics? Is there a specific place you're stuck on the problem, or having trouble coming up with a general approach?