unity 유니티 게임 만들기 RPG 게임만들기 13 Unity Event 및 Send Message()

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유니티가 제공하는 유니티 이벤트 기능인  UnityEvent 를 만들고 AddListenr() 함수를 등록해 보겠습니다

 

플레이어가 몬스터를 공격하였을때 몬스터가 죽으면 몬스터의 죽는 순간의 이벤트를 처리하고

몬스터가 죽음과 동시에 플레이어의 행동을 다시 Idle로 변환하는 SendMessage() 를 처리하여 보겠습니다

 

CharackterParams 스크립트를 선택하고 스크립트를 수정합니다

//CharackterParams 스크립트수정

 

 

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;//유니티 이벤트를 사용하기 위해서는 네임스페이스를 추가해야함

//CharacterParams는 플레이어의 파라미터 클래스와 몬스터 파라미터 클래스의 부모 클래스 역할을 하게됨
public class CharacterParams : MonoBehaviour
{
    //퍼블릭 변수가 아니라 약식프로퍼티,속성으로 지정
    //퍼블릭 변수와 똑같이 사용할수 있지만 유니티 인스펙터에 노출되는 것을 막고 보안을 위해정식 프로퍼티로 전환이 쉬워짐
    public int level { get; set; } 
    public int maxHp { get; set; }
    public int curHp { get; set; }
    public int attackMin { get; set; }
    public int attackMax { get; set; }
    public int defense { get; set; }
    public bool isDead { get; set; }

    [System.NonSerialized]
    public UnityEvent deadEvent = new UnityEvent();

    void Start()
    {
        InitParams();
    }

    //나중에 CharacterParams 클래스를 상속한 자식클래스 에서 
    //InitParams 함수 에 자신만의 명령어를 추가하기만 하면 자동으로 필요한 명령어들이 실행
    public virtual void InitParams()
    {

    }

    public int GetRandomAttack()
    {
        int randAttack = Random.Range(attackMin, attackMax + 1);
        return randAttack;
    }

    public void SetEnemyAttack(int enemyAttackPower)
    {
        curHp -= enemyAttackPower;
        UpdateAfterReceiveAttack();
    }

    //캐릭터가 적으로 부터 공격을 받은 뒤에 자동으로 실행될 함수를 가상함수로 만듬
    protected virtual void UpdateAfterReceiveAttack()
    {
        print(name + "'s HP: " + curHp);

        if (curHp <= 0)
        {
            curHp = 0;
            isDead = true;
            deadEvent.Invoke();
        }
    }
}

 

EnemyFSM 스크립트를 선택하고 수정합니다

 

 

 

 

 

 

 

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class EnemyFSM : MonoBehaviour
{
    public enum State
    {
        Idle,  //정지
        Chase,  //추적
        Attack,  //공격
        Dead,   //사망
        NoState  //아무 일도 없는 상태
    }

    public State currentState = State.Idle;

    EnemyParams myParams;

    EnemyAni myAni;

    Transform player;

    PlayerParams playerParams;

    float chaseDistance = 5f; // 플레이어를 향해 몬스터가 추적을 시작할 거리
    float attackDistance = 2.5f; // 플레이어가 안쪽으로 들오오게 되면 공격을 시작
    float reChaseDistance = 3f; // 플레이어가 도망 갈 경우 얼마나 떨어져야 다시 추적

    float rotAnglePerSecond = 360f; // 초당 회전 각도
    float moveSpeed = 1.3f; // 몬스터의 이동 속도

    float attackDelay = 2f;
    float attackTimer = 0f;

    public ParticleSystem hitEffect;

    void Start()
    {
        myAni = GetComponent<EnemyAni>();
        myParams = GetComponent<EnemyParams>();
        myParams.deadEvent.AddListener(CallDeadEvent);

        ChangeState(State.Idle, EnemyAni.IDLE);

        player = GameObject.FindGameObjectWithTag("Player").transform;
        playerParams = player.gameObject.GetComponent<PlayerParams>();

        hitEffect.Stop();
    }

    //몬스터가 죽는 순간 처리 명령어
    void CallDeadEvent()
    {
        ChangeState(State.Dead, EnemyAni.DIE);
        player.gameObject.SendMessage("CurrentEnemyDead");
    }

    public void ShowHitEffect()
    {
        hitEffect.Play();
    }

    void UpdateState()
    {
        switch (currentState)
        {
            case State.Idle:
                IdleState();
                break;
            case State.Chase:
                ChaseState();
                break;
            case State.Attack:
                AttackState();
                break;
            case State.Dead:
                DeadState();
                break;
            case State.NoState:
                NoState();
                break;          
        }
    }

    public void ChangeState(State newState, string aniName)
    {
        if (currentState == newState)
        {
            return;
        }

        currentState = newState;
        myAni.ChangeAni(aniName);
    }
    void IdleState()
    {
        if (GetDistanceFromPlayer() < chaseDistance)
        {
            ChangeState(State.Chase, EnemyAni.WALK);
        }
    }

    void ChaseState()
    {
        //몬스터가 공격 가능 거리 안으로 들어가면 공격 상태
        if (GetDistanceFromPlayer() < attackDistance)
        {
            ChangeState(State.Attack, EnemyAni.ATTACK);
        }
        else
        {
            TurnToDestination();
            MoveToDestination();
        }   
    }

    void AttackState()
    {
        if (GetDistanceFromPlayer() > reChaseDistance)
        {
            attackTimer = 0f;
            ChangeState(State.Chase, EnemyAni.WALK);
        }
        else
        {
            if (attackTimer > attackDelay)
            {
                transform.LookAt(player.position);
                myAni.ChangeAni(EnemyAni.ATTACK);

                attackTimer = 0f;
            }

            attackTimer += Time.deltaTime;
        }
    }
    void DeadState()
    {
        GetComponent<BoxCollider>().enabled = false;
    }
    void NoState()
    {

    }

    void TurnToDestination()
    {
        Quaternion lookRotation = Quaternion.LookRotation(player.position - transform.position);

        transform.rotation = Quaternion.RotateTowards(transform.rotation, lookRotation, Time.deltaTime * rotAnglePerSecond);
    }

    void MoveToDestination()
    {
        transform.position = Vector3.MoveTowards(transform.position, player.position, moveSpeed * Time.deltaTime);
    }

    //플레이어와 거리을 재는 함수
    float GetDistanceFromPlayer()
    {
        float distance = Vector3.Distance(transform.position, player.position);
        return distance;
    }

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

 

 

 

 

PlayerFSM 스크립트를 선택하고 수정합니다

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerFSM : MonoBehaviour
{  
    public enum State
    {
        Idle,
        Move,
        Attack,
        AttackWait,
        Dead
    }
    //idle 상태를 기본 상태로 지정
    public State currentState = State.Idle;

    //마우수 클릭 지점,플레이어가 이동할 목적지의 좌표를 저장할 예정
    Vector3 curTargetPos;

    GameObject curEnemy;

    public float rotAnglePerSecond = 360f; //1초에 플레이어의 방향을 360도 회전한다

    public float moveSpeed = 2f; //초당 2미터의 속도로 이동

    float attackDelay = 2f; // 공격을 한번하고 다시 공격할때 까지의 지연시간

    float attackTimer = 0f; //공격을 하고 난 뒤에 경과되는 시간을 계산하기 위한 변수

    float attackDistance = 1.5f; // 공격 거리 (적과의 거리)

    float chaseDistance = 2.5f; // 전투 중 적이 도망가면 다시 추적을 시작 하기 위한 거리

    PlayerAni myAni;

    PlayerParams myParams;

    EnemyParams curEnemyParams;
    void Start()
    {
        myAni = GetComponent<PlayerAni>();
        //  myAni.ChangeAni(PlayerAni.ANI_WALK);

        myParams = GetComponent<PlayerParams>();

        myParams.InitParams();

        ChangeState(State.Idle, PlayerAni.ANI_IDLE);
    }

    public void CurrentEnemyDead()
    {
        ChangeState(State.Idle, PlayerAni.ANI_IDLE);
        print("enemy was killed");

        curEnemy = null;
    }

    public void AttackCalculate()
    {
        if (curEnemy == null)
        {
            return;
        }
        curEnemy.GetComponent<EnemyFSM>().ShowHitEffect();

        int attackPower = myParams.GetRandomAttack();
        curEnemyParams.SetEnemyAttack(attackPower);
    }

    // 적을 공격하기 위한 함수 
    public void AttackEnemy(GameObject enemy)
    {
        if (curEnemy != null && curEnemy == enemy)
        {
            return;
        }

        //적(몬스터)의 파라미터를 변수에 저장
        curEnemyParams = enemy.GetComponent<EnemyParams>();

        if (curEnemyParams.isDead == false)
        {
            curEnemy = enemy;
            curTargetPos = curEnemy.transform.position;

            ChangeState(State.Move, PlayerAni.ANI_WALK);
        }
        else
        {
            curEnemyParams = null;
        }
  
    }
    void ChangeState(State newState, int aniNumber)
    {
        if (currentState == newState)
        {
            return;
        }
        myAni.ChangeAni(aniNumber);
        currentState = newState;
    }

 

 

 

    //캐릭터의 상태가 바뀌면 어떤 일이 일어날지 를 미리 정의
    void UpdateState()
    {
        switch (currentState)
        {
            case State.Idle:

                IdleState();

                break;
            case State.Move:

                MoveState();

                break;
            case State.Attack:

                AttackState();

                break;
            case State.AttackWait:

                AttackWaitState();

                break;
            case State.Dead:

                DeadState();

                break;
            default:
                break;
        }
    }
   void IdleState()
    {

    }

    void MoveState()
    {
        TurnToDestination();
        MoveToDestination();
    }
    void AttackState()
    {
        attackTimer = 0f;

        //transform.LookAt(목표지점 위치) 목표지점을 향해 오브젝트를 회전 시키는 함수
        transform.LookAt(curTargetPos);
        ChangeState(State.AttackWait, PlayerAni.ANI_ATKIDLE);
    }
    void AttackWaitState()
    {
        if (attackTimer > attackDelay)
        {
            ChangeState(State.Attack, PlayerAni.ANI_ATTACK);

        }

        attackTimer += Time.deltaTime;
    }
    void DeadState()
    {

    }

    //MoveTo(캐릭터가 이동할 목표 지점의 좌표)
   public void MoveTo(Vector3 tPos)
    {
        curEnemy = null;
        curTargetPos = tPos;
        ChangeState(State.Move, PlayerAni.ANI_WALK);
    }
    void TurnToDestination()
    {
        // Quaternion lookRotation(회전할 목표 방향) : 목표 방향은 목적지 위치에서 자신의 위치를 빼면 구함
        Quaternion lookRotation = Quaternion.LookRotation(curTargetPos - transform.position);

        //Quaternion.RotateTowards(현재의 rotation값, 최종목표rotation 값, 최대 회전각)
        transform.rotation = Quaternion.RotateTowards(transform.rotation, lookRotation, Time.deltaTime * rotAnglePerSecond);
    }

    void MoveToDestination()
    {
        //Vector3.MoveTowards(시작지점, 목표지점,최대이동거리)
        transform.position = Vector3.MoveTowards(transform.position, curTargetPos,moveSpeed * Time.deltaTime);

        if (curEnemy == null)
        {
            //플레이어의 위치와 목표지점의 위치가 같으면, 상태를 Idle 상태로 바꾸라는 명령
            if (transform.position == curTargetPos)
            {
                ChangeState(State.Idle, PlayerAni.ANI_IDLE);
            }
        }
        else if (Vector3.Distance(transform.position,curTargetPos) < attackDistance)//Vector3.Distance(A,B):A와B사이의 거리
        {
            ChangeState(State.Attack, PlayerAni.ANI_ATTACK);
        }
    }
    void Update()
    {
        UpdateState();
    }
}

 

게임을 실행하여 몬스터가 HP 를 소모 하면 죽는 행동과 플레이어가 IDLE 상태로 변하는 것을 확인 합니다

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