[Haskell-cafe] typeclass for transformation of Euclidean points

Hi. What I'd like to have for a program I am working on is a generic typeclass for objects that can be treated like points on a 2D plane, and a few simple transform functions (e.g., addition, rotation around an origin) which I could combine to make more complex transformations. Of course, it would be trivial to do this myself, but it seems like the sort of thing somebody would have thought of already. Does anybody know of a package providing this? (I didn't see an obvious one when searching with hoogle.) -- http://justonemoremathproblem.com