Allow arbitrary rotation angle

[jcpsantiago]

I'm looking for a way to rotate an image with a transparent background and found your library. I understand the merits of only allowing thetas multiple of 90deg, but that's a concern that I don't have at all (there's no background anyway, so it's fine to lose information there).

I looked at the source code but don't really know where to start, geometry is not my strong suit. Is this something complicated to implement? If it's something you don't/can't do, could you give me some pointers?

[karls]

Hey @jcpsantiago. Thank you for your interest in collage.

First off, I am too busy to take this on myself at the moment. But if you want to give it a shot, I'd be happy to help review code etc.

Geometry isn't my strong suit either. :) I had a quick look at the rotation code and I think the hard part (probably) is figuring out what the width and height of the new image should be. I found this one pager with some pointers on how to do it.

I don't think making this work would be overly difficult, but it's still a bit of work fiddling with the Java APIs, figuring out corner cases (like handling background colour for non-transparent images rotated through arbitrary angles etc), tests and so on.

If you felt like taking a stab at this, I would be happy. I have very little spare bandwidth to work on this myself at the moment.