Unity学习笔记四

接着三，此次主要是编码操控怪物的动做

设定一下这个类的主要功能：

• 初始化的时候怪物站立，播放idle动画
• 发现与主角位置 < 20 时冲向主角
• 被攻击时冲向主角
• 与主角距离 < 7时攻击主角
• 攻击方式随机3中

1.新建一个类EnemyController:

先定义一些变量：

      //攻击距离范围
    private const int ATTACK_DISTANCE = 7;

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

    //攻击对应的生命减小值
    private const int BlOOD_REDUCE_ATTACK1 = 5;
    private const int BlOOD_REDUCE_ATTACK2 = 8;
    private const int BlOOD_REDUCE_ATTACK3 = 10;

    //怪物当前的状态
     private const int STATE_IDLE = 1;
     private const int STATE_RUN = 2;
     private const int STATE_ATTACK = 3;
     private const int STATE_DEAD = 4;

     //当前状态
     private int currentState;
     //动画
     private Animation ani;
     //主角
     private GameObject role; 

     //是否被攻击
     private bool isAttacked = false;
     //是否已经被主角吸引了仇恨
     private bool isAttacking = false;

初始化的时候，先获取到怪物对象的动画组件以及主角对象。

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

2.而后在update()方法里面添加3个方法用来刷新怪物的动做

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

3.第一个方法checkState()主要是用于判断当前怪物与主句的位置

进行状态变动：

//检测怪物状态
     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;  //设置怪物仇恨被激活
        }
        else
        {
            currentState = STATE_IDLE;
        }

4.第二个方法checkAttack()主要是检测怪物的仇恨是否已被激活，若是是，

则不管距离多少都一直追着主角跑：

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

//朝主角跑来
     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;//追击方向
        transform.Translate(-dir * Common.MOVE_SPEED * Time.deltaTime);//不停地移动
    }

5.第三个方法handlerAction()是根据状态来处理怪物的动做：

//根据状态处理处理怪物动做
     private void handlerAction()
     {
          switch (currentState) {
          case STATE_IDLE:
               ani.Play("idle");
               break;
          case STATE_RUN:
               run();
               break;
          case STATE_ATTACK:
               //上一次攻击完了以后才进行下一次攻击
               if (false == ani.isPlaying)
               {
                    attack();
               }
               break;
          case STATE_DEAD:
               dead();
               break;
          default:
               Debug.Log("error state = "+currentState);
               break;
          }
     }

//攻击
     private void attack()
     {
          isAttacking = true;
          int attackIndex = Random.Range (1, 4);
          switch (attackIndex) {
               case STATE_IDLE:
                    ani.Play("attack1");
                //告诉主角生命减小量

                 //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");
                //告诉主角生命减小量
                role.SendMessage("reduceBlood", BlOOD_REDUCE_ATTACK2);

                break;
               case STATE_ATTACK:
                    ani.Play("attack3");
                //告诉主角生命减小量
                role.SendMessage("reduceBlood", BlOOD_REDUCE_ATTACK3);

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

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

6.新建一个文件RoleBloodController并把它绑定在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.运行游戏~！