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Utility classes providing a physical force simulation for layout and
animation. Force simulations consist of a series of force functions that
calculate forces acting on data elements, and an integrator that determines
how these calculated forces effect the position and velocity of these elements
over time. The {@link prefuse.util.force.ForceSimulator} class keeps track of
which elements should be included in the simulation, as well as which
{@link prefuse.util.force.Force} functions and
{@link prefuse.util.force.Integrator} are used.
To create your own custom simulations, create a new ForceSimulator instance
and add the desired force functions. Custom force functions can be introduced
by subclassing {@link prefuse.util.force.AbstractForce} or implementing the
{@link prefuse.util.force.Force} interface.
Additionally, the {@link prefuse.util.ui.JForcePanel} user interface component
can be used during development to explore different parameterizations of the
various force functions until a desired behavior is found.