PacMan/Assets/Scripts/RedGhost.cs

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

public class RedGhost : MonoBehaviour
{
    // ========== ״̬ö<CCAC><C3B6> ==========
    public enum GhostState
    {
        Idle,        //<2F><><EFBFBD>ֵĴ<D6B5><C4B4><EFBFBD>
        Start,      //<2F>뿪<EFBFBD><EBBFAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
        Chase,      // ׷<><D7B7>ģʽ
        Frightened, // <20>־<EFBFBD>ģʽ,<2C><><EFBFBD><EFBFBD>
        Die       // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    }
    public GhostState curstate;//<2F><>ǰö<C7B0><C3B6>

    [Header("<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>")]
    public Rigidbody2D rb;
    public Animator anim;
    public GameObject pacMan;//<2F>Զ<EFBFBD><D4B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    public LayerMask obstadeLayer;//ǽ<>IJ㼶

    [Header("׷<><D7B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߼<EFBFBD><DFBC><EFBFBD><EFBFBD><EFBFBD>")]
    private Vector2 currentDirection;     //<2F><>ǰ<EFBFBD><C7B0><EFBFBD><EFBFBD>

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߲<EFBFBD><DFB2><EFBFBD>
    [Header("<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>")]
    public float castDistance = 1f;     // <20><><EFBFBD>߼<EFBFBD><DFBC>ⳤ<EFBFBD><E2B3A4>
    public float boxWidth = 0.3f;       // <20><><EFBFBD>߿<EFBFBD><DFBF><EFBFBD>
    public Color validColor = Color.green;  // <20><>Ч<EFBFBD><D0A7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɫ
    public Color blockedColor = Color.red;  // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɫ

    public float speed;//<2F><><EFBFBD><EFBFBD><EFBFBD>ٶ<EFBFBD>
    public float frightenedSpeed;//<2F><><EFBFBD><EFBFBD><EFBFBD>ٶ<EFBFBD>

    private void Awake()
    {
        rb = GetComponent<Rigidbody2D>();
        // anim = GetComponent<Animator>();
        pacMan = GameObject.Find("PacManPlayer");//<2F>ҵ<EFBFBD><D2B5><EFBFBD><EFBFBD><EFBFBD>
    }

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


   
    private void Idle()
    {
        curstate = GhostState.Chase;
    }

    private void GhostStart()
    {
        throw new NotImplementedException();
    }


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

    private void Frightened()
    {
        throw new NotImplementedException();
    }

    private void Die()
    {
        throw new NotImplementedException();
    }




    // <20><><EFBFBD><EFBFBD><EFBFBD>ƶ<EFBFBD><C6B6>߼<EFBFBD><DFBC><EFBFBD>׷<EFBFBD><D7B7>/<2F><><EFBFBD>ܹ<EFBFBD><DCB9>ã<EFBFBD>
    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;//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>󣬸<EFBFBD><F3A3ACB8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>

        foreach (Vector2 dir in directions)
        {
            if (dir == -currentDirection) continue; // ѭ<><D1AD><EFBFBD><EFBFBD><EFBFBD>ķ<EFBFBD><C4B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD>ǰ<EFBFBD>ĸ<EFBFBD><C4B8><EFBFBD><EFBFBD>򣬼<EFBFBD><F2A3ACBC><EFBFBD>ִ<EFBFBD>У<EFBFBD><D0A3><EFBFBD>ֱֹ<D6B9>ӻ<EFBFBD>ͷ

            // ʹ<><CAB9>BoxCast<73><74><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
            bool isBlocked = Physics2D.BoxCast(transform.position,GetBoxSize(dir),0f,dir,castDistance,obstadeLayer);

            if (isBlocked) continue;

            // <20><><EFBFBD>㷽<EFBFBD><E3B7BD><EFBFBD><EFBFBD>ֵ
            float distance = Vector2.Distance(rb.position + dir, targetPos);//<2F><>ǰ<EFBFBD><C7B0><EFBFBD><EFBFBD><EFBFBD>ӷ<EFBFBD><D3B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ<EFBFBD><C4BF><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>IJ<EFBFBD>ֵ
            float currentValue = isChasing ? distance : -distance;//<2F><>׷<EFBFBD><D7B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>

            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;
        }
    }

    // <20><><EFBFBD>ݷ<EFBFBD><DDB7><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><C8A1>ͬ<EFBFBD><CDAC><EFBFBD><EFBFBD><EFBFBD>ߺ<EFBFBD><DFBA>ӳߴ<D3B3>
    private Vector2 GetBoxSize(Vector2 direction)
    {
        return new Vector2(
            direction.x = boxWidth,
            direction.y = boxWidth
        );
    }

    // <20><><EFBFBD>ӻ<EFBFBD><D3BB><EFBFBD><EFBFBD><EFBFBD>
    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
            );
        }
    }

    // <20><><EFBFBD>ƺ<EFBFBD><C6BA><EFBFBD>Ͷ<EFBFBD><CDB6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    private void DrawBoxCastGizmo(Vector2 origin, Vector2 direction, Vector2 size, float distance)
    {
        Vector2 endPos = origin + direction * distance;

        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>յ<EFBFBD><D5B5>ĺ<EFBFBD><C4BA><EFBFBD>
        Gizmos.DrawWireCube(origin, size);
        Gizmos.DrawWireCube(endPos, size);

        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
        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);
    }
}