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      2  * Copyright (c) 2013, Daniel Murphy
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     24 package org.jbox2d.dynamics.joints;
     25 
     26 import java.util.ArrayList;
     27 
     28 import org.jbox2d.dynamics.Body;
     29 
     30 /**
     31  * Definition for a {@link ConstantVolumeJoint}, which connects a group a bodies together so they
     32  * maintain a constant volume within them.
     33  */
     34 public class ConstantVolumeJointDef extends JointDef {
     35   public float frequencyHz;
     36   public float dampingRatio;
     37 
     38   ArrayList<Body> bodies;
     39   ArrayList<DistanceJoint> joints;
     40 
     41   public ConstantVolumeJointDef() {
     42     super(JointType.CONSTANT_VOLUME);
     43     bodies = new ArrayList<Body>();
     44     joints = null;
     45     collideConnected = false;
     46     frequencyHz = 0.0f;
     47     dampingRatio = 0.0f;
     48   }
     49 
     50   /**
     51    * Adds a body to the group
     52    *
     53    * @param argBody
     54    */
     55   public void addBody(Body argBody) {
     56     bodies.add(argBody);
     57     if (bodies.size() == 1) {
     58       bodyA = argBody;
     59     }
     60     if (bodies.size() == 2) {
     61       bodyB = argBody;
     62     }
     63   }
     64 
     65   /**
     66    * Adds a body and the pre-made distance joint. Should only be used for deserialization.
     67    */
     68   public void addBodyAndJoint(Body argBody, DistanceJoint argJoint) {
     69     addBody(argBody);
     70     if (joints == null) {
     71       joints = new ArrayList<DistanceJoint>();
     72     }
     73     joints.add(argJoint);
     74   }
     75 }
     76