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Prefuse is a set of software tools for creating rich interactive data visualizations in the Java programming language.

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package prefuse.util.force;

/**
 * Represents a point particle in a force simulation, maintaining values for
 * mass, forces, velocity, and position.
 *
 * @author jeffrey heer
 */
public class ForceItem implements Cloneable {
    
    /**
     * Create a new ForceItem.
     */
    public ForceItem() {
        mass = 1.0f;
        force = new float[] { 0.f, 0.f };
        velocity = new float[] { 0.f, 0.f };
        location = new float[] { 0.f, 0.f };
        plocation = new float[] { 0.f, 0.f };
        k = new float[4][2];
        l = new float[4][2];
    }
    
    /**
     * Clone a ForceItem.
     * @see java.lang.Object#clone()
     */
    public Object clone() {
        ForceItem item = new ForceItem();
        item.mass = this.mass;
        System.arraycopy(force,0,item.force,0,2);
        System.arraycopy(velocity,0,item.velocity,0,2);
        System.arraycopy(location,0,item.location,0,2);
        System.arraycopy(plocation,0,item.plocation,0,2);
        for ( int i=0; i