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A 2D java physics engine, a port of the C++ Box2d engine. This is the core physics engine.
There is a newer version: 2.2.1.1
/*******************************************************************************
 * Copyright (c) 2011, Daniel Murphy
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 	* Redistributions of source code must retain the above copyright notice,
 * 	  this list of conditions and the following disclaimer.
 * 	* Redistributions in binary form must reproduce the above copyright notice,
 * 	  this list of conditions and the following disclaimer in the documentation
 * 	  and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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package org.jbox2d.dynamics;

import org.jbox2d.common.Vec2;

// updated to rev 100
/**
 * A body definition holds all the data needed to construct a rigid body.
 * You can safely re-use body definitions. Shapes are added to a body
 * after construction.
 * 
 * @author daniel
 */
public class BodyDef {
	
	/**
	 * The body type: static, kinematic, or dynamic.
	 * Note: if a dynamic body would have zero mass, the mass is set to one.
	 */
	public BodyType type;
	
	/**
	 * Use this to store application specific body data.
	 */
	public Object userData;
	
	/**
	 * The world position of the body. Avoid creating bodies at the origin
	 * since this can lead to many overlapping shapes.
	 */
	public Vec2 position;
	
	/**
	 * The world angle of the body in radians.
	 */
	public float angle;
	
	/**
	 * The linear velocity of the body in world co-ordinates.
	 */
	public Vec2 linearVelocity;
	
	/**
	 * The angular velocity of the body.
	 */
	public float angularVelocity;
	
	/**
	 * Linear damping is use to reduce the linear velocity. The damping parameter
	 * can be larger than 1.0f but the damping effect becomes sensitive to the
	 * time step when the damping parameter is large.
	 */
	public float linearDamping;
	
	/**
	 * Angular damping is use to reduce the angular velocity. The damping parameter
	 * can be larger than 1.0f but the damping effect becomes sensitive to the
	 * time step when the damping parameter is large.
	 */
	public float angularDamping;
	
	/**
	 * Set this flag to false if this body should never fall asleep. Note that
	 * this increases CPU usage.
	 */
	public boolean allowSleep;
	
	/**
	 * Is this body initially sleeping?
	 */
	public boolean awake;
	
	/**
	 * Should this body be prevented from rotating? Useful for characters.
	 */
	public boolean fixedRotation;
	
	/**
	 * Is this a fast moving body that should be prevented from tunneling through
	 * other moving bodies? Note that all bodies are prevented from tunneling through
	 * kinematic and static bodies. This setting is only considered on dynamic bodies.
	 * 
	 * @warning You should use this flag sparingly since it increases processing time.
	 */
	public boolean bullet;
	
	/**
	 * Does this body start out active?
	 */
	public boolean active;
	
	/**
	 * Experimental: scales the inertia tensor.
	 */
	public float inertiaScale;
	
	public BodyDef() {
		userData = null;
		position = new Vec2();
		angle = 0f;
		linearVelocity = new Vec2();
		angularVelocity = 0f;
		linearDamping = 0f;
		angularDamping = 0f;
		allowSleep = true;
		awake = true;
		fixedRotation = false;
		bullet = false;
		type = BodyType.STATIC;
		active = true;
		inertiaScale = 1.0f;
	}
}