yichael_smartbow/Assets/ArtAsset/Hunter/Models/Wolf/Wolf.cs

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

public class Wolf : TargetAnimal
{
    //动画播放器
    AnimationPlayer ap;
    //寻路代理
    NavMeshAgent agent;

    void Awake()
    {
        ap = GetComponent<AnimationPlayer>();
        agent = GetComponent<NavMeshAgent>();
    }

    void Start()
    {
        initAniListener();
        InitAutoStrategy();
    }


    void Update()
    {
        if (HasCloseToDestination()) {
            OnReachDestination();
        }
        UpdateAutoStrategy();
        UpdateAction();
    }

    //可选皮肤材质
    [SerializeField] Material[] materials;
    public void ChangeColorByType(int type) {
        GetComponentInChildren<SkinnedMeshRenderer>().material = materials[type - 1];
    }

    public override void OnHit(Arrow arrow, Vector3 hitPoint, string partName)
    {
        arrow.Head().position = hitPoint + arrow.transform.forward * 0.1f;
        arrow.Hit();
        if (partName == "Leg" || partName == "Tail") {
            state.hp -= 2;
        }
        else if (partName == "Body") {
            state.hp -= 3;
        }
        else if (partName == "Head") {
            state.hp -= 100;
        }
        if (state.hp > 0) {
            Hurt();
        } else {
            Die(arrow);
        }
    }

    void Die(Arrow arrow) {
        if (state.dead) return;
        arrow.onDoNextShoot += delegate() { Destroy(this.gameObject); };
        state.ResetActionState();
        state.dead = true;
        this.agent.enabled = false;
        onDie?.Invoke(this);
        AudioMgr.ins.PlayAnimalEffect("wolf_die", AudioMgr.GetAudioSource(this.gameObject));
    }

    void Hurt() {
        state.lockingTarget = true;
        state.ResetActionState();
        AudioMgr.ins.PlayAnimalEffect("wolf_injured", AudioMgr.GetAudioSource(this.gameObject));
    }
    
    //启动寻路
    void SetDestination(Vector3 pos) {
        state.ResetActionState();
        state.moving = true;
        this.agent.destination = pos;
    }
    //寻路结束
    void OnReachDestination() {
        if (!state.moving) return;
        state.ResetActionState();
    }
    //是否已经接近目的地（寻路完成判断）
    bool HasCloseToDestination() {
        if (!state.moving) return true;
        if (Vector3.Distance(this.agent.nextPosition, this.agent.destination) < 0.25f) {
            return true;
        }
        if (state.movingTime > 0.1f && this.agent.velocity.magnitude < 0.05f) {
            return true;
        }
        return false;
    }

    float willStayTime;
    float willMoveTime;  
    bool autoMoving = false;
    float autoMovingTime;
    bool willAttack = false;
    bool hasRunAround = false;
    bool hasRunToHunter = false;
    //帧更新逻辑-自动策略
    void UpdateAutoStrategy() {
        if (state.dead) return;
        if (state.lockingTarget) {
            if (state.attacking) {
                this.transform.LookAt(this.hunterPosition);
            }
            if (!hasRunToHunter) {
                hasRunToHunter = true;
                RunToAttackHunter();
                willAttack = true;
                return;
            }
            if (!state.moving && !state.attacking) {
                if (willAttack) {
                    willAttack = false;
                    Attack();
                    return;
                }
                if (Random.value > 0.5f) {
                    RunAroundHunter();
                    hasRunAround = true;
                    return;
                }
                if (hasRunAround) {
                    hasRunAround = false;
                    RunToAttackHunter();
                }
                willAttack = true;
                return;
            }
            return;
        }
        if (state.stayingTime > willStayTime) {
            //退出stay
            RandomWillStayTime();
            //进入move
            autoMoving = true;
            MoveSlowlyInZPath();
        } 
        if (autoMoving) {
            if (state.moving) {
                autoMovingTime += Time.deltaTime;
            } else if (autoMovingTime < willMoveTime) {
                MoveSlowlyInZPath();
            }
            if (autoMovingTime >= willMoveTime) {
                //退出move
                RandomWillMoveTime();
                autoMoving = false;
                autoMovingTime = 0;
                //进入stay
                Stay();
            }
        }
    }
    void InitAutoStrategy() {
        this.willStayTime = 1f + Random.value * 2;
        RandomWillMoveTime();
    }
    void RandomWillStayTime() {
        this.willStayTime = Random.value * 2 + 3;
    }
    void RandomWillMoveTime() {
        this.willMoveTime = Random.value * 3 + 5;
    }

    //攻击
    void Attack() {
        state.ResetActionState();
        state.attacking = true;
        curAnimIndex = -1; /*注意：这样可避免狼两次使用同一攻击动作而第二次无法播放的情况 */
        int hurtValue = 2;
        if (Random.value < 0.5) {
            state.attackA = true;
        } else {
            state.attackB = true;
            hurtValue = 3;
        }
        onAttack?.Invoke(this, hurtValue);
    }
    //跑到能攻击玩家的坐标点
    void RunToAttackHunter() {
        Vector3 standardPointer = animalsBaseT.forward;
        Vector3 newPos = animalsBaseT.position + standardPointer * 1.5f;
        SetDestination(newPos);
        state.moveQuickly = true;
        agent.speed = 5f;
    }
    //在敌人身边奔跑徘徊
    void RunAroundHunter() {
        float baseDistance = 2;
        float baseDistanceMoveRange = 5;
        Vector3 standardPointer = animalsBaseT.forward;
        Vector3 pointerWithLen = standardPointer.normalized * (baseDistance + Random.value * baseDistanceMoveRange);
        pointerWithLen = Quaternion.AngleAxis(-80f + Random.value * 160f, Vector3.up) * pointerWithLen;
        Vector3 newPos = animalsBaseT.position + pointerWithLen;
        SetDestination(newPos);
        state.moveQuickly = true;
        agent.speed = 5f;
    }
    //Z字型路径缓慢移动
    Queue<Vector3> zPathPoints = new Queue<Vector3>();
    bool canCreateZPath = true;
    void MoveSlowlyInZPath() {
        if (zPathPoints.Count > 0) {
            SetDestination(zPathPoints.Dequeue());
            state.moveSlowly = true;
            agent.speed = 0.8f;
            return;
        }
        if (!canCreateZPath) {
            state.lockingTarget = true;
            return;
        }
        //构建Z字型路径
        zPathPoints.Clear();
        Vector3 standardPos = animalsBaseT.forward;
        Vector3 hunterPos = hunterPosition;
        Vector3 pointerToMe = GetPointerHunterToMe().normalized;
        Vector3 pointer1 = Quaternion.AngleAxis(120, Vector3.up) * pointerToMe;
        Vector3 pointer2 = Quaternion.AngleAxis(-120, Vector3.up) * pointerToMe;
        Vector3 myPos = this.transform.position;
        int[] pointerSeq = {1, 2, 1};
        bool isReverse = Random.value < 0.5;
        foreach (int seqID in pointerSeq)
        {
            Vector3 lastMyPos = myPos;
            if (seqID == 1) myPos = myPos + (isReverse ? pointer2 : pointer1) * 5;
            if (seqID == 2) myPos = myPos + (isReverse ? pointer1 : pointer2) * 10;
            hunterPos.y = myPos.y;
            Vector3 hunterToMe = myPos - hunterPos;
            float angle = Vector3.Angle(hunterToMe, standardPos);
            float minDistance = 8;
            //如果下一个构建的坐标在猎手身后或者距离猎手低于指定距离
            if (angle > 90 || Vector3.Distance(hunterPos, myPos) < minDistance) {
                Vector3 hunterToMe2 = lastMyPos - hunterPos;
                if (hunterToMe2.magnitude > minDistance + 2) {
                    Vector3 displace = (hunterToMe2).normalized * minDistance;
                    myPos = hunterPos + displace;
                    zPathPoints.Enqueue(myPos);
                }
                canCreateZPath = false;
                break;
            } else {
                zPathPoints.Enqueue(myPos);
            }
        }
    }
    //停留
    void Stay() {
        if (state.moving) {
            this.agent.destination = this.agent.nextPosition;
        }
        state.ResetActionState();
        state.staying = true;
    }

    //动画播放
    int curAnimIndex = 0;
    void playAniStay() {
        ap.play(curAnimIndex = 3, WrapMode.Loop);
    }
    bool isAniStay() {
        return curAnimIndex == 3;
    }
    void playAniMoveSlowly() {
        ap.play(curAnimIndex = 5, WrapMode.Loop);
    }
    bool isAniMoveSlowly() {
        return curAnimIndex == 5;
    }
    void playAniMoveQuickly() {
        ap.play(curAnimIndex = 4, WrapMode.Loop);
    }
    bool isAniMoveQuickly() {
        return curAnimIndex == 4;
    }
    void playAniAttakA() {
        ap.play(curAnimIndex = 1, WrapMode.Once);
    }
    bool isAniAttakA() {
        return curAnimIndex == 1;
    }
    void playAniAttakB() {
        ap.play(curAnimIndex = 0, WrapMode.Once);
    }
    bool isAniAttakB() {
        return curAnimIndex == 0;
    }
    void playAniDie() {
        ap.play(curAnimIndex = 2, WrapMode.Once);
    }
    bool isAniDie() {
        return curAnimIndex == 2;
    }
    void initAniListener() {
        this.ap.completeCallback = delegate(AnimationPlayerCompleteResult res) {
            if (res.index == 1 || res.index == 0) {
                this.state.ResetActionState();
            }
        };
    }

    //帧更新逻辑-通过状态更新动作动画
    void UpdateAction() {
        if (state.staying) {
            state.stayingTime += Time.deltaTime;
            if (!isAniStay()) playAniStay();
        } 
        else if (state.moving) {
            state.movingTime += Time.deltaTime;
            if (state.moveSlowly && !isAniMoveSlowly()) playAniMoveSlowly();
            if (state.moveQuickly && !isAniMoveQuickly()) playAniMoveQuickly(); 
        } 
        else if (state.attacking) {
            if (state.attackA && !isAniAttakA()) playAniAttakA();
            if (state.attackB && !isAniAttakB()) playAniAttakB(); 
        } 
        else if (state.dead) {
            if (!isAniDie()) playAniDie();
        }
    }

    //状态
    [System.Serializable]
    public class State {
        //数值区
        public int hp = 1;
        //动作区
        public bool staying = true;
        public bool moving = false;
        public bool moveSlowly = false; //慢走
        public bool moveQuickly = false; //跑动
        public bool attacking = false;
        public bool attackA = false; //扑击
        public bool attackB = false; //撕咬
        public bool dead = false;
        public float stayingTime = 0;
        public float movingTime = 0;
        //特定区
        public bool lockingTarget = false; //锁定目标
        //重置动作区状态
        public void ResetActionState() {
            this.staying = false;
            this.moving = false;
            this.moveSlowly = false;
            this.moveQuickly = false;
            this.attacking = false;
            this.attackA = false;
            this.attackB = false;
            this.dead = false;
            this.stayingTime = 0;
            this.movingTime = 0;
        }
    }
    [SerializeField] public State state = new State();

    //委托
    public System.Action<Wolf> onDie;
    public System.Action<Wolf, int> onAttack;
}