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 * Copyright (c) 2013, Daniel Murphy
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package org.jbox2d.dynamics.joints;

import java.util.ArrayList;

import org.jbox2d.dynamics.Body;

/** Definition for a {@link ConstantVolumeJoint}, which connects a group a bodies together so they maintain a constant volume
 * within them. */
public class ConstantVolumeJointDef extends JointDef {
	public float frequencyHz;
	public float dampingRatio;

	ArrayList<Body> bodies;
	ArrayList<DistanceJoint> joints;

	public ConstantVolumeJointDef () {
		super(JointType.CONSTANT_VOLUME);
		bodies = new ArrayList<Body>();
		joints = null;
		collideConnected = false;
		frequencyHz = 0.0f;
		dampingRatio = 0.0f;
	}

	/** Adds a body to the group
	 * 
	 * @param argBody */
	public void addBody (Body argBody) {
		bodies.add(argBody);
		if (bodies.size() == 1) {
			bodyA = argBody;
		}
		if (bodies.size() == 2) {
			bodyB = argBody;
		}
	}

	/** Adds a body and the pre-made distance joint. Should only be used for deserialization. */
	public void addBodyAndJoint (Body argBody, DistanceJoint argJoint) {
		addBody(argBody);
		if (joints == null) {
			joints = new ArrayList<DistanceJoint>();
		}
		joints.add(argJoint);
	}
}
