doorknob

Physics engine

TODO:

style guide
setup to build
a Vector class
- (x,y)
- sq_length()
- dot()
- normalize()
- add, subtract, component-wise multiplication
a 2x2 Matrix
- rotations
a World class
a Body class
- position
- geometry
- rotation
- mass
a Geometry class
- Circle
- Box
- Terrain... bezier curves???? no