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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.
 *     * Neither the name of the  nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * 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 DANIEL MURPHY 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, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ******************************************************************************/
package org.jbox2d.dynamics.contacts;

import org.jbox2d.collision.Manifold;
import org.jbox2d.collision.shapes.CircleShape;
import org.jbox2d.collision.shapes.ShapeType;
import org.jbox2d.common.Transform;
import org.jbox2d.dynamics.Fixture;
import org.jbox2d.pooling.IWorldPool;

// updated to rev 100

public class CircleContact extends Contact {
	
	/**
	 * @param argPool
	 */
	public CircleContact(IWorldPool argPool) {
		super(argPool);
	}

	public void init(Fixture fixtureA, Fixture fixtureB){
		super.init(fixtureA, fixtureB);
		assert(m_fixtureA.getType() == ShapeType.CIRCLE);
		assert(m_fixtureB.getType() == ShapeType.CIRCLE);
	}
	
	@Override
	public void evaluate(Manifold manifold, Transform xfA, Transform xfB) {
		pool.getCollision().collideCircles(manifold,
				(CircleShape)m_fixtureA.getShape(), xfA,
				(CircleShape)m_fixtureB.getShape(), xfB);
	}
}