starting centroidmass branch, where internal forces are modeled like a bicycle wheel: every mass on the perimeter is connected by a spring to a mass at the center
its been a while....
Redesigned GestureRecognizer interface, so that it now handles multiple drags. Also started calculating intersections of bubbles and handling collisions properly. Up next is fixing the collision resolution, as it behaves funkily on most angles of impact. Also need to replace NSMapping with NSMapTable
before merging centroid mass back in
before merging centroidmass
NSMapping must go to NSHashTable. Handles multi touch drags via KryptoDragRecognizer, beginning of proper collision handling