PacMan/Assets/Scripts/RedGhost.cs

using System;
using System.Collections;
using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.SocialPlatforms.Impl;
using UnityEngine.UIElements;

public class RedGhost : MonoBehaviour
{
    // ========== 状态枚举 ==========
    public enum GhostState
    {
        Idle,        //开局的待机
        Start,      //离开重生点出发
        Chase,      // 追击模式
        Frightened, // 恐惧模式,逃跑
        Die       // 死亡重生
    }
    public GhostState curstate;//当前枚举

    [Header("基础配置")]
    public Rigidbody2D rb;
    public Animator anim;
    public GameObject pacMan;//吃豆人主角
    private PacMan pacManComponent; //吃豆人脚本
    public LayerMask obstadeLayer;//墙的层级
    public Transform GhostRevivePoint;//复活点，每个鬼不一样，死亡传送回来
    public Transform GhostStartPoint;//从复活点移动到开始追击点的位置
    public float stateTimer; //计时器
    public bool isFrightened = false;//已经进入恐惧状态，保证update中只执行一次
    public float idleDuration;//一开始发呆的时间
    public float DieDuration;//死亡时间
    public float Score = 1000;//鬼死亡给的分数


    [Header("追击逃跑逻辑相关")]
    private Vector2 currentDirection;     //当前方向
    public float speed;//基础速度
    public float frightenedSpeed;//逃跑速度

    // 新增射线参数
    [Header("射线设置")]
    public float castDistance = 1f;     // 射线检测长度
    public float boxWidth = 0.3f;       // 射线宽度
    public Color validColor = Color.green;  // 有效射线颜色
    public Color blockedColor = Color.red;  // 受阻射线颜色

    

    private void Awake()
    {
        rb = GetComponent<Rigidbody2D>();
        // anim = GetComponent<Animator>();
        pacMan = GameObject.Find("PacManPlayer");//找到主角
        pacManComponent = pacMan.GetComponent<PacMan>();
    }

    private void Update()
    {
        switch (curstate)
        {
            case GhostState.Idle:
                Idle();
                break;  
            case GhostState.Die:
                Die();
                break;
        }

        if(pacManComponent.invincible && curstate == GhostState.Chase && !isFrightened)//未在恐惧状态才进入
        {
            Debug.Log("进入恐惧状态");
            isFrightened = true;
            curstate = GhostState.Frightened;
        }
    }

    private void FixedUpdate()
    {
        switch (curstate)
        {
            case GhostState.Start:
                GhostStart();
                break;
            case GhostState.Chase:
                Chase();
                break;
            case GhostState.Frightened:
                Frightened();
                break;
        }
    }

    private void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.gameObject == pacMan)
        {
            if (curstate == GhostState.Frightened)
            {
                transform.position = GhostRevivePoint.position;//传送到复活点
                isFrightened = false;//恐惧变回false
                rb.velocity = Vector2.zero;//位置不变
                stateTimer = 0;//重新计数
                GameManager.instance.AddScore(Score);//加分
              
                curstate = GhostState.Die;
            }
            else if (curstate == GhostState.Chase)
            {
                // 触发吃豆人死亡逻辑
                pacManComponent.die = true;
               // Time.timeScale = 0;//游戏暂停
            }
        }
    }

    private void Idle()
    {
        // 待机计时逻辑
        stateTimer += Time.deltaTime;
        if (stateTimer >= idleDuration)
        {
            stateTimer = 0;
            curstate = GhostState.Start;
            
        }
       // anim.SetBool("Moving", false);
    }

    private void GhostStart()
    {
        // 向起始点移动
        Vector2 direction = ((Vector2)GhostStartPoint.position - rb.position).normalized;//方向归一
        rb.velocity = direction * speed *Time.deltaTime;
        if (Vector2.Distance(transform.position, GhostStartPoint.position) < 0.1f)//坐标与目标坐标小于一定值
        {
            transform.position = GhostStartPoint.position;
            curstate = GhostState.Chase;
        }
    }


    private void Chase()
    {
        UpdateMovement(pacMan.transform.position, true);
    }

    private void Frightened()
    {
       
        // 直接读取主角的剩余无敌时间
        float remainingTime = pacManComponent.remainingInvincibleTime;
        if (remainingTime <=0)//时间累加大于主角身上的无敌时间，切换回追击
        {
          
            isFrightened = false;//把恐惧中切换为未恐惧
            curstate = GhostState.Chase;
           
          //  anim.SetBool("Frightened", false);
          // return;
        }

        UpdateMovement(pacMan.transform.position, false);
        //anim.SetBool("Frightened", true);
    }

    private void Die()
    {
      
        stateTimer += Time.deltaTime;
        if(stateTimer >= DieDuration)
        {
            stateTimer = 0;
            curstate = GhostState.Idle;
        }
        
        //播放死亡动画
    }




    // 核心移动逻辑（追击/逃跑共用）
    private void UpdateMovement(Vector2 targetPos, bool isChasing)
    {
        Vector2[] directions = { Vector2.up, Vector2.down, Vector2.left, Vector2.right };
        Vector2 bestDir = Vector2.zero;
        float bestValue = isChasing ? Mathf.Infinity : -Mathf.Infinity;//正无穷大，负无穷大

        foreach (Vector2 dir in directions)
        {
            if (dir == -currentDirection) continue; // 循环到的方向等于当前的负方向，跳到下一次循环，禁止直接回头

            // 使用BoxCast进行区域检测
            bool isBlocked = Physics2D.BoxCast(transform.position,GetBoxSize(dir),0f,dir,castDistance,obstadeLayer);

            if (isBlocked) continue;

            // 计算方向价值
            float distance = Vector2.Distance(rb.position + dir, targetPos);//当前坐标加方向向量和目标主角坐标的差值
            float currentValue = distance;//是追击还是逃跑

            if ((isChasing && currentValue < bestValue) || (!isChasing && currentValue > bestValue))
            {
                bestValue = currentValue;
                bestDir = dir;
            }
        }

        if (bestDir != Vector2.zero)
        {
            currentDirection = bestDir;
            rb.velocity = currentDirection.normalized * (curstate == GhostState.Frightened ? frightenedSpeed : speed) * Time.deltaTime;
        }
    }

    // 根据方向获取不同的射线盒子尺寸
    private Vector2 GetBoxSize(Vector2 direction)
    {
        return new Vector2(
            direction.x = boxWidth,//射线长宽
            direction.y = boxWidth
        );
    }

   


    // 可视化射线
    private void OnDrawGizmos()
    {
        if (!Application.isPlaying) return;

        foreach (Vector2 dir in new[] { Vector2.up, Vector2.down, Vector2.left, Vector2.right })
        {
            Gizmos.color = Physics2D.BoxCast(transform.position, GetBoxSize(dir), 0f, dir, castDistance, obstadeLayer)
                ? blockedColor
                : validColor;

            DrawBoxCastGizmo(
                transform.position,
                dir,
                GetBoxSize(dir),
                castDistance
            );
        }
    }

    // 绘制盒子投射区域
    private void DrawBoxCastGizmo(Vector2 origin, Vector2 direction, Vector2 size, float distance)
    {
        Vector2 endPos = origin + direction * distance;

        // 绘制起点和终点的盒子
        Gizmos.DrawWireCube(origin, size);
        Gizmos.DrawWireCube(endPos, size);

        // 绘制连接线
        Vector2 perpendicular = new Vector2(-direction.y, direction.x) * size.x / 2;
        Vector2 edge1 = origin + perpendicular;
        Vector2 edge2 = origin - perpendicular;
        Gizmos.DrawLine(edge1, edge1 + direction * distance);
        Gizmos.DrawLine(edge2, edge2 + direction * distance);
    }
}