How to use org.jbox2d.dynamics.joints

  /** Set/get the damping ratio (dimensionless). */
  public float getDampingRatio () {
    return joint.getDampingRatio();
  }
}

  /** Get the gear ratio. */
  public float getRatio () {
    return joint.getRatio();
  }
}

  /** Get the pulley ratio. */
  public float getRatio () {
    return joint.getRatio();
  }
}

@Override
public boolean solvePositionConstraints(SolverData step) {
 return constrainEdges(step.positions);
}

/** Set the motor speed in radians per second. */
public void setMotorSpeed (float speed) {
  motorSpeed = speed;
  joint.setMotorSpeed(speed);
}

/** Get the motor speed, usually in meters per second. */
public float getMotorSpeed () {
  return joint.getMotorSpeed();
}

  /** Get the maximum friction torque in N*m. */
  public float getMaxTorque () {
    return joint.getMaxTorque();
  }
}

  /** Set/get damping ratio. */
  public float getDampingRatio () {
    return joint.getDampingRatio();
  }
}

/** Set/get the frequency in Hertz. */
public float getFrequency () {
  return joint.getFrequency();
}

/** Get the current joint translation, usually in meters. */
public float getJointTranslation () {
  return joint.getJointTranslation();
}

/** Enable/disable the joint limit. */
public void enableLimit (boolean flag) {
  joint.enableLimit(flag);
}

/** Set/get frequency in Hz. */
public float getFrequency () {
  return joint.getFrequency();
}

/** Set the joint limits in radians.
 * @param upper */
public void setLimits (float lower, float upper) {
  joint.setLimits(lower, upper);
}

/** Set the gear ratio. */
public void setRatio (float ratio) {
  joint.setRatio(ratio);
}

/** Set/Get the maximum motor force, usually in N-m. */
public void setMaxMotorTorque (float torque) {
  joint.setMaxMotorTorque(torque);
}

/** Get the current motor torque given the inverse time step, usually in N-m. */
public float getMotorTorque (float invDt) {
  return joint.getMotorTorque(invDt);
}

/** Set/get the damping ratio (dimensionless). */
public void setDampingRatio (float ratio) {
  joint.setDampingRatio(ratio);
}

/** Set/get the maximum force in Newtons. */
public void setMaxForce (float force) {
  joint.setMaxForce(force);
}

/** Get the reaction torque on body2 in N*m. */
public float getReactionTorque (float inv_dt) {
  return joint.getReactionTorque(inv_dt);
}

/** Short-cut function to determine if either body is inactive. */
public boolean isActive () {
  return joint.isActive();
}