How to use

org.jbox2d.dynamics.joints.MouseJointDef

constructor

  @Override
  public org.jbox2d.dynamics.joints.JointDef toJBox2d () {
    org.jbox2d.dynamics.joints.MouseJointDef jd = new org.jbox2d.dynamics.joints.MouseJointDef();
    jd.bodyA = bodyA.body;
    jd.bodyB = bodyB.body;
    jd.collideConnected = collideConnected;
    jd.dampingRatio = dampingRatio;
    jd.frequencyHz = frequencyHz;
    jd.maxForce = maxForce;
    jd.target.set(target.x, target.y);
    jd.type = org.jbox2d.dynamics.joints.JointType.MOUSE;
    return jd;
  }
}

 MouseJoint wheelJoint;
MouseJointDef mouseJointDef = new MouseJointDef();
mouseJointDef.bodyA = <something>;
mouseJointDef.bodyB = wheelBody;
mouseJointDef.target.set(0 + chosenWheelPositionOffsetX, 0 + chosenWheelPositionOffsetY);
mouseJointDef.target.addLocal(wheelCenterX, wheelCenterY);
mouseJointDef.dampingRatio = <chosen_value>;
mouseJointDef.frequencyHz = <chosen_value>;
mouseJointDef.maxForce = <chosen_value>;
wheelJoint = (MouseJoint) mWorld.createJoint(mouseJointDef);

private void spawnMouseJoint(Vec2 p) {
 if (mouseJoint != null) {
  return;
 }
 queryAABB.lowerBound.set(p.x - .001f, p.y - .001f);
 queryAABB.upperBound.set(p.x + .001f, p.y + .001f);
 callback.point.set(p);
 callback.fixture = null;
 m_world.queryAABB(callback, queryAABB);
 if (callback.fixture != null) {
  Body body = callback.fixture.getBody();
  MouseJointDef def = new MouseJointDef();
  def.bodyA = groundBody;
  def.bodyB = body;
  def.collideConnected = true;
  def.target.set(p);
  def.maxForce = 1000f * body.getMass();
  mouseJoint = (MouseJoint) m_world.createJoint(def);
  body.setAwake(true);
 }
}

MouseJointDef def = new MouseJointDef();
def.bodyA = groundBody;
def.bodyB = hitBody[pointer];

 public MouseJoint createMouseJoint(AnimatedSprite box , float x, float y)
{
  final Body boxBody =
  this.mPhysicsWorld.getPhysicsConnectorManager().findBodyByShape(box);

  Vector2 v = boxBody.getWorldPoint(
          new Vector2(x/pixelToMeteRatio, y/pixelToMeteRatio)
          );

  MouseJointDef mjd = new MouseJointDef();
  mjd.bodyA               = groundBody;
  mjd.bodyB               = boxBody;
  mjd.dampingRatio        = 0.2f;
  mjd.frequencyHz         = 30;
  mjd.maxForce            = (float) (200.0f * boxBody.getMass());
  mjd.collideConnected    = true;
  mjd.target.set(v);
  return (MouseJoint) this.mPhysicsWorld.createJoint(mjd);
}

MouseJointDef def = new MouseJointDef();
jd = def;
def.dampingRatio = joint.getDampingRatio();

/**
 * Called for mouse-down
 * 
 * @param p
 */
public void mouseDown(Vec2 p) {
 mouseWorld.set(p);
 if (mouseJoint != null) {
  return;
 }
 queryAABB.lowerBound.set(p.x - .001f, p.y - .001f);
 queryAABB.upperBound.set(p.x + .001f, p.y + .001f);
 callback.point.set(p);
 callback.fixture = null;
 m_world.queryAABB(callback, queryAABB);
 if (callback.fixture != null) {
  Body body = callback.fixture.getBody();
  MouseJointDef def = new MouseJointDef();
  def.bodyA = groundBody;
  def.bodyB = body;
  def.target.set(p);
  def.maxForce = 1000f * body.getMass();
  mouseJoint = (MouseJoint) m_world.createJoint(def);
  body.setAwake(true);
 }
}

MouseJointDef def = new MouseJointDef();
def.bodyA = groundBody;
def.bodyB = hitBody[pointer];