Collision subsystem

When an object moves, it sends a notification to the appropriate behavior objects (TExplosionBehavior and TBoundingBoxBehavior). The behavior objects determine if the movement caused an interaction. If an interaction is sensed, a behavior object acts appropriately. For example, when a large asteroid collides with a bullet, TExplosionBehavior sends the asteroid an Explode call, which--because it's a large asteroid--breaks the asteroid into two medium asteroids.

The TCollisionBehavior abstract class represents a behavior between an actor and its environment or between two or more actors--it defines an abstract protocol through which actors can interact. It has two concrete derived classes: TExplosionBehavior and TBoundingBoxBehavior.

The MColliding class provides protocol through which a TCollisionBehavior is notified of changes in the simulation.