Unity制作赛车游戏(无尽版)源码解析 和 Whell joint 2D组件的使用

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       public class CarMove : MonoBehaviour {
       public float speed = 10f; //初速度
       public WheelJoint2D leftWhell;  //车轮
       public WheelJoint2D rightWhell;
       public float phSpeed = 5.0f;  //平衡调整速度
       public AudioSource carSound;  //获取组件以播放声音
       public AudioClip runClip;   //开车时的音频剪辑
       public AudioClip waitClip;
       private Transform myTrans;  //自己的Transform
       //给车轮加动力的
       private JointMotor2D jmL,jmR;
      	void Start () {
       //获取速度
        jmL = leftWhell.motor;
        jmR = rightWhell.motor;
        myTrans = this.transform;
        }
      	// Update is called once per frame
      	void Update () {
        Move();
        }
       private void Move()
        {
       //获取输入
       float ax = Input.GetAxis("Horizontal");
       float ay = Input.GetAxis("Vertical");
       //当前速度
        jmL.motorSpeed = ax * speed;
        jmR.motorSpeed = ax * speed;
       //赋值
        leftWhell.motor = jmL;
        rightWhell.motor = jmR;
       if(ay != 0)
        {
       //左右平衡赛车的角度
        myTrans.Rotate(myTrans.forward, ay * phSpeed);
        }
       if ( ax != 0 ) //有移动变化量就不播放runClip
        {
        carSound.clip = runClip;
       if(!carSound.isPlaying){
        carSound.Play();
        }
        }else  //停下就不播放声音
        {
        carSound.Stop();
        }
        }
       }