The org.openzoom.flash.viewport.constraints package contains the viewport constraint classes.

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	Class	Description
	CenterConstraint	Centers the scene once it is all visible.
	CompositeConstraint	CompositeConstraint allows you to apply many different constraints at the same time.
	FillConstraint	Ensures that the scene always entirely fills the viewport.
	MapConstraint	Viewport constraint that ensures that the viewport only reaches zoom values that are powers of two.
	NullConstraint	NullConstraint doesn't aplly any constraints to a viewport.
	ScaleConstraint	Provides a way to limit the minimum and maximum scale the scene can reach.
	VisibilityConstraint	Provides basic bounds checking by ensuring that a certain ratio of the scene is always visible.
	ZoomConstraint	Provides a way to limit the minimum and maximum zoom the viewport can reach.