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	Class	Description
	AbstractCollection	The abstract base class for all grouping classes.
	AbstractConstraint	The abstract base class for all constraints.
	AbstractItem	The base class for all constraints and particles
	AbstractParticle	The abstract base class for all particles.
	APEngine	The main engine class.
	CircleParticle	A circle shaped particle.
	Composite	The Composite class can contain Particles, and Constraints.
	Group	The Group class can contain Particles, Constraints, and Composites.
	RectangleParticle	A rectangular shaped particle.
	SpringConstraint	A Spring-like constraint that connects two particles
	Vector
	WheelParticle	A particle that simulates the behavior of a wheel