@Override
  public void keyPressed(char argKeyChar, int argKeyCode) {
    switch (argKeyChar) {
      case 's':
        joint.setMotorSpeed(0);
        break;
      case '1':
        joint.setMotorSpeed(MathUtils.PI);
        break;
      case '2':
        joint.setMotorSpeed(MathUtils.PI * 2);
        break;
      case '3':
        joint.setMotorSpeed(MathUtils.PI * 3);
        break;
      case '4':
        joint.setMotorSpeed(MathUtils.PI * 6);
        break;
      case '5':
        joint.setMotorSpeed(MathUtils.PI * 10);
        break;
    }
  }