[F9] Vector class help

[Fall_X]

Thanks for the advice. Exactly what I was hoping for.

I havenow changed my implementation so that I have a NullVector base class (without first coordinates, they are assumed 0 in the calculations), which should be a bit faster when you don't need the first coordinates. Then my Vector class extends this. I plan to use vectors to describe levels (for collision), so it makes sense to have a class with two sets of coordinates. Not too sure about the name NullVector though, but I couldn't think of anything appropriate. (edit: think I'm going to go for DisplacementVector which extends PositionVector, but I'm not sure yet).

As for calculating the angle each time something changes, well, that was a choice I had to make. Faster getting or faster setting of variables. It should be easy to change anyway.