UnityEngine;  
using System.Collections;  
  
public class PlayerControl : MonoBehaviour  
{  
    [HideInInspector]  
    public bool facingRight = true;            // 为了确定玩家正在面临哪种途径 
    [HideInInspector]  
    public bool jump = false;                // 判断玩家是否该跳
  
  
    public float moveForce = 365f;            // Amount of force added to move the player left and right.  
    public float maxSpeed = 5f;                // 玩家能到达的最大速度 
    public AudioClip[] jumpClips;            // 玩家跳的时候的声音 
    public float jumpForce = 1000f;            // Amount of force added when the player jumps.  
    public AudioClip[] taunts;                // 但玩家嘲讽时的声音
    public float tauntProbability = 50f;    // Chance of a taunt happening.  
    public float tauntDelay = 1f;            // Delay for when the taunt should happen.  
  
  
    private int tauntIndex;                    // The index of the taunts array indicating the most recent taunt.  
    private Transform groundCheck;            // 一个去判断玩家是否接触地面的标志  
    private bool grounded = false;            // Whether or not the player is grounded.  
    private Animator anim;                    // 指向玩家的动画组件
  
  
    void Awake()  
    {  
        // Setting up references.  
        // 在子对象里面找到groundCheck  
        groundCheck = transform.Find("groundCheck");  
        // 获取当前的动画控制器  
        anim = GetComponent<Animator>();  
    }  
  
    void Update()  
    {  
        // 是为能随时检测到groundCheck这个物体，添加一个名叫Ground的Layer（层次），然后把场景中的所有代表地面的物体的Layer设为Ground  
        // 这里用到了2D射线检测Physics2D.Linecast()  
        // LayerMask实际上是一个位码操作，在Unity3d中Layers一共有32层，这个是不能增加或者减少的:  
        // 1 << LayerMask.NameToLayer("Ground") 这一句实际上表示射线查询只在Ground所在这个层级查找 是返回的该名字所定义的层的层索引，注意是从0开始  
        // 每个GameObject的Inspector面板最上方都也有个Layer选项，就在Tag旁边，unity3d已经有了几个层，我们新建个层，也叫UI，点击Add Layer，可以看到从Layer0到Layer7都灰掉了，那是不能用的，从第八个起可以用，所以在第八个建个UI的层。  
        // 一般情况下我们只用前两个参数，distance表示射线距离，默认是无限远，重点是最后一个参数layerMask，专门处理layer过滤的，是个整型，怎么用呢，是靠layer的二进制位来操作的  
        // LayerMask的NameToLayer是通过层的名称返回该层的索引，这里是8，然后1<<8换算成LayerMask值，再用LayerMask的value就可以了。  
        // 注意也必须设置collider才能接收碰撞，这里才能判断到。  
        grounded = Physics2D.Linecast(transform.position, groundCheck.position, 1 << LayerMask.NameToLayer("Ground"));    
        //以上程式碼是用來測試是否在地面上
        // If the jump button is pressed and the player is grounded then the player should jump.  
        // 如果点击了跳的按键，并且已经着陆，那么就可以跳起来  
        if(Input.GetButtonDown("Jump") && grounded)  
            jump = true;  
    }  
  
    // 因为主角游戏对象要使用到刚体力，所以一定要写在FixedUpdate里面，不能放在Update上  
    void FixedUpdate ()  
    {  
        // Cache the horizontal input.  
        // 换取水平方向的移动距离  
        float h = Input.GetAxis("Horizontal");  
  
        // The Speed animator parameter is set to the absolute value of the horizontal input.  
        // 设置动画的速度变量  
        anim.SetFloat("Speed", Mathf.Abs(h));  
  
        // 给物体添加一个水平的力，让它移动的时候会产生惯性的效果  
        // If the player is changing direction (h has a different sign to velocity.x) or hasn‘t reached maxSpeed yet...  
        // 如果速度小于最大的速度   
        if(h * rigidbody2D.velocity.x < maxSpeed)  
            // ... add a force to the player.  
            rigidbody2D.AddForce(Vector2.right * h * moveForce);  
  
        // If the player‘s horizontal velocity is greater than the maxSpeed...  
        if(Mathf.Abs(rigidbody2D.velocity.x) > maxSpeed)  
            // ... set the player‘s velocity to the maxSpeed in the x axis.  
            rigidbody2D.velocity = new Vector2(Mathf.Sign(rigidbody2D.velocity.x) * maxSpeed, rigidbody2D.velocity.y);  
  
        // 转身  
        // If the input is moving the player right and the player is facing left...  
        if(h > 0 && !facingRight)  
            // ... flip the player.  
            Flip();  
        // Otherwise if the input is moving the player left and the player is facing right...  
        else if(h < 0 && facingRight)  
            // ... flip the player.  
            Flip();  
  
        // If the player should jump...  
        if(jump)  
        {  
            // Set the Jump animator trigger parameter.  
            // 触发跳的动画  
            anim.SetTrigger("Jump");  
  
            // Play a random jump audio clip.  
            int i = Random.Range(0, jumpClips.Length);  
            AudioSource.PlayClipAtPoint(jumpClips[i], transform.position);  
  
            // Add a vertical force to the player.  
            // 添加一个垂直的力  
            rigidbody2D.AddForce(new Vector2(0f, jumpForce));  
  
            // Make sure the player can‘t jump again until the jump conditions from Update are satisfied.  
            jump = false;  
        }  
    }  
      
    // 转身  
    void Flip ()  
    {  
        // Switch the way the player is labelled as facing.  
        facingRight = !facingRight;  
  
        // Multiply the player‘s x local scale by -1.  
        Vector3 theScale = transform.localScale;  
        theScale.x *= -1;  
        transform.localScale = theScale;  
    }  
  
  
    public IEnumerator Taunt()  
    {  
        // Check the random chance of taunting.  
        float tauntChance = Random.Range(0f, 100f);  
        if(tauntChance > tauntProbability)  
        {  
            // Wait for tauntDelay number of seconds.  
            yield return new WaitForSeconds(tauntDelay);  
  
            // If there is no clip currently playing.  
            if(!audio.isPlaying)  
            {  
                // Choose a random, but different taunt.  
                tauntIndex = TauntRandom();  
  
                // Play the new taunt.  
                audio.clip = taunts[tauntIndex];  
                audio.Play();  
            }  
        }  
    }  
  
  
    int TauntRandom()  
    {  
        // Choose a random index of the taunts array.  
        int i = Random.Range(0, taunts.Length);  
  
        // If it‘s the same as the previous taunt...  
        if(i == tauntIndex)  
            // ... try another random taunt.  
            return TauntRandom();  
        else  
            // Otherwise return this index.  
            return i;  
    }  
}