Unity學習筆記四

接着三，此次主要是編碼操控怪物的動做

設定一下這個類的主要功能：

• 初始化的時候怪物站立，播放idle動畫
• 發現與主角位置 < 20 時衝向主角
• 被攻擊時衝向主角
• 與主角距離 < 7時攻擊主角
• 攻擊方式隨機3中

1.新建一個類EnemyController:

先定義一些變量：

      //攻擊距離範圍
    private const int ATTACK_DISTANCE = 7;

      //吸引怪物距離
     private const int RUN_TO_ROLE_DISTANCE = 20;

    //攻擊對應的生命減小值
    private const int BlOOD_REDUCE_ATTACK1 = 5;
    private const int BlOOD_REDUCE_ATTACK2 = 8;
    private const int BlOOD_REDUCE_ATTACK3 = 10;

    //怪物當前的狀態
     private const int STATE_IDLE = 1;
     private const int STATE_RUN = 2;
     private const int STATE_ATTACK = 3;
     private const int STATE_DEAD = 4;

     //當前狀態
     private int currentState;
     //動畫
     private Animation ani;
     //主角
     private GameObject role; 

     //是否被攻擊
     private bool isAttacked = false;
     //是否已經被主角吸引了仇恨
     private bool isAttacking = false;

初始化的時候，先獲取到怪物對象的動畫組件以及主角對象。

// Use this for initialization
     void Start () {
          ani = animation;
          role = GameObject.Find ("role");
     }

2.而後在update()方法裏面添加3個方法用來刷新怪物的動做

// Update is called once per frame
     void Update () {
          checkState();
        checkAttack();
          handlerAction ();
     }

3.第一個方法checkState()主要是用於判斷當前怪物與主句的位置

進行狀態變動：

//檢測怪物狀態
     private void checkState()
     {
         if (Vector3.Distance(role.transform.position, transform.position) <= RUN_TO_ROLE_DISTANCE

&& Vector3.Distance(role.transform.position, transform.position) > ATTACK_DISTANCE )

         {
               currentState = STATE_RUN;
          }
        else if (Vector3.Distance(role.transform.position, transform.position) <= ATTACK_DISTANCE)
        {
            currentState = STATE_ATTACK;
            isAttacking = true;  //設置怪物仇恨被激活
        }
        else
        {
            currentState = STATE_IDLE;
        }

4.第二個方法checkAttack()主要是檢測怪物的仇恨是否已被激活，若是是，

則不管距離多少都一直追着主角跑：

 //是否已經被吸引了仇恨
    private void checkAttack()
    {
        if(true == isAttacking)
        {
            transform.LookAt(role.transform);
            if (Vector3.Distance(role.transform.position, transform.position) > 7)
            {
                run();
            }
        }
    }

//朝主角跑來
     private void run()
     {
          ani.Play("run");
        transform.LookAt(role.transform);
        //Returns this vector with a magnitude of 1 (Read Only).
        //When normalized, a vector keeps the same direction but its length is 1.0.
        Vector3 dir = (role.transform.position - transform.position).normalized;//追擊方向
        transform.Translate(-dir * Common.MOVE_SPEED * Time.deltaTime);//不停地移動
    }

5.第三個方法handlerAction()是根據狀態來處理怪物的動做：

//根據狀態處理處理怪物動做
     private void handlerAction()
     {
          switch (currentState) {
          case STATE_IDLE:
               ani.Play("idle");
               break;
          case STATE_RUN:
               run();
               break;
          case STATE_ATTACK:
               //上一次攻擊完了以後才進行下一次攻擊
               if (false == ani.isPlaying)
               {
                    attack();
               }
               break;
          case STATE_DEAD:
               dead();
               break;
          default:
               Debug.Log("error state = "+currentState);
               break;
          }
     }

//攻擊
     private void attack()
     {
          isAttacking = true;
          int attackIndex = Random.Range (1, 4);
          switch (attackIndex) {
               case STATE_IDLE:
                    ani.Play("attack1");
                //告訴主角生命減小量

                 //Calls the method named methodName on every MonoBehaviour in this game object.
                role.SendMessage("reduceBlood", BlOOD_REDUCE_ATTACK1);

                    break;
               case STATE_RUN:
                    ani.Play("attack2");
                //告訴主角生命減小量
                role.SendMessage("reduceBlood", BlOOD_REDUCE_ATTACK2);

                break;
               case STATE_ATTACK:
                    ani.Play("attack3");
                //告訴主角生命減小量
                role.SendMessage("reduceBlood", BlOOD_REDUCE_ATTACK3);

                break;
               default:
                Debug.Log("error state = "+currentState);
                break;
          }
     }

//死亡
     private void dead()
     {
          Destroy (gameObject);
     }

6.新建一個文件RoleBloodController並把它綁定在Role上:

public class RoleBloodController : MonoBehaviour{

     // Use this for initialization
     void Start () {

     }
     
     // Update is called once per frame
     void Update () {

     }

     public void reduceBlood(int reduceNum)
     {
          Debug.Log (reduceNum);
     }
}

7.運行遊戲~！