388 lines
14 KiB
C#
388 lines
14 KiB
C#
using UnityEngine;
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namespace IndianOceanAssets.Engine2_5D
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{
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/// <summary>
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/// 敌人AI v2 —— 双重寻敌机制（视觉检测 + 铃铛响应）
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///
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/// 状态流程：
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/// - Idle：待机。射线检测到玩家 → ChasingPlayer；收到铃铛信号 → ChasingBell
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/// - ChasingPlayer：追击玩家。持续看到玩家则追击；脱离视线3秒后 → Idle
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/// - ChasingBell：追击铃铛。追击过程中看到玩家 → ChasingPlayer；到达铃铛位置 → PatrollingBell
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/// - PatrollingBell：铃铛位置巡逻。巡逻过程中看到玩家 → ChasingPlayer；巡逻时间结束 → Idle
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///
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/// 挂载位置：敌人预制体上
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/// 需要：场景中有 EchoSystem（用于摇铃事件）、玩家物体带 "Player" 标签
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/// （或手动把玩家拖到 playerTarget 字段）
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/// </summary>
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public class EnemyAI : MonoBehaviour
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{
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[Header("目标")]
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[Tooltip("玩家目标（留空则自动查找 Player 标签）")]
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[SerializeField] private Transform playerTarget;
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[Header("检测与追击")]
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[Tooltip("靠近主角到此距离时停下")]
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[SerializeField] private float stopDistance = 1.2f;
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[Tooltip("追击速度")]
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[SerializeField] private float chaseSpeed = 3f;
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[Header("视觉检测")]
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[Tooltip("射线检测层（哪些物体会阻挡视线）")]
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[SerializeField] private LayerMask obstacleLayers;
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[Tooltip("射线起点偏移（避免从地面发射）")]
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[SerializeField] private float rayOffsetY = 0.5f;
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[Header("脱离计时")]
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[Tooltip("玩家脱离视线后，继续追击的时间（秒）")]
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[SerializeField] private float loseSightTime = 3f;
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[Header("聆听（摇铃响应）")]
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[Tooltip("聆听范围：主角在此范围内按E摇铃时，敌人会朝铃铛位置移动")]
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[SerializeField] private float listenRange = 15f;
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[Header("铃铛追击")]
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[Tooltip("到达铃铛位置后的容差距离")]
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[SerializeField] private float bellArriveDistance = 1f;
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[Tooltip("追击铃铛的最大时间（超时则放弃）")]
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[SerializeField] private float bellChaseTimeout = 10f;
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[Header("铃铛巡逻")]
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[Tooltip("到达铃铛位置后的巡逻时间")]
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[SerializeField] private float bellPatrolTime = 5f;
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[Tooltip("巡逻半径")]
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[SerializeField] private float bellPatrolRadius = 3f;
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// 状态枚举
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private enum State
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{
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Idle, // 待机
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ChasingPlayer, // 追击玩家
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ChasingBell, // 追击铃铛
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PatrollingBell // 铃铛位置巡逻
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}
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private State _state = State.Idle;
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// 脱离视线计时器
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private float _loseSightTimer;
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// 铃铛相关
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private Vector3 _bellTargetPosition; // 铃铛目标位置
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private float _bellChaseTimer; // 铃铛追击计时器
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// 巡逻相关
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private Vector3 _patrolCenter; // 巡逻中心点
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private float _patrolTimer; // 巡逻计时器
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private Vector3 _patrolTarget; // 当前巡逻目标点
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private void Start()
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{
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if (playerTarget == null)
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{
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var player = GameObject.FindWithTag("Player");
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if (player != null)
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playerTarget = player.transform;
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}
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}
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private void OnEnable()
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{
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EchoSystem.OnEchoReleased += OnBell;
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}
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private void OnDisable()
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{
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EchoSystem.OnEchoReleased -= OnBell;
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}
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private void Update()
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{
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switch (_state)
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{
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case State.Idle: UpdateIdle(); break;
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case State.ChasingPlayer: UpdateChasingPlayer(); break;
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case State.ChasingBell: UpdateChasingBell(); break;
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case State.PatrollingBell: UpdatePatrollingBell(); break;
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}
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}
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// ===== Idle：待机，等待检测 =====
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private void UpdateIdle()
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{
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// 检测是否看到玩家
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if (CanSeePlayer())
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{
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_state = State.ChasingPlayer;
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_loseSightTimer = 0f;
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return;
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}
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}
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// ===== ChasingPlayer：追击玩家 =====
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private void UpdateChasingPlayer()
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{
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// 检测是否看到玩家
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if (CanSeePlayer())
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{
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_loseSightTimer = 0f; // 重置计时器
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// 追击玩家
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float dist = XZDistance(transform.position, playerTarget.position);
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if (dist > stopDistance)
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{
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MoveToward(playerTarget.position, chaseSpeed);
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}
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}
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else
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{
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// 玩家脱离视线，开始计时
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_loseSightTimer += Time.deltaTime;
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// 继续朝玩家最后已知位置移动
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if (playerTarget != null)
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{
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float dist = XZDistance(transform.position, playerTarget.position);
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if (dist > stopDistance)
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{
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MoveToward(playerTarget.position, chaseSpeed);
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}
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}
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// 超过设定时间，停止追击
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if (_loseSightTimer >= loseSightTime)
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{
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_state = State.Idle;
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}
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}
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}
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// ===== ChasingBell：追击铃铛 =====
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private void UpdateChasingBell()
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{
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// 追击过程中检测是否看到玩家
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if (CanSeePlayer())
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{
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_state = State.ChasingPlayer;
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_loseSightTimer = 0f;
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return;
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}
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// 追击计时
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_bellChaseTimer += Time.deltaTime;
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if (_bellChaseTimer >= bellChaseTimeout)
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{
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_state = State.Idle;
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return;
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}
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// 检测是否到达铃铛位置
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float dist = XZDistance(transform.position, _bellTargetPosition);
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if (dist <= bellArriveDistance)
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{
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// 到达铃铛位置，开始巡逻
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_state = State.PatrollingBell;
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_patrolCenter = _bellTargetPosition;
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_patrolTimer = 0f;
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PickNewPatrolPoint();
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return;
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}
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// 朝铃铛位置移动
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MoveToward(_bellTargetPosition, chaseSpeed);
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}
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// ===== PatrollingBell：铃铛位置巡逻 =====
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private void UpdatePatrollingBell()
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{
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// 巡逻过程中检测是否看到玩家
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if (CanSeePlayer())
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{
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_state = State.ChasingPlayer;
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_loseSightTimer = 0f;
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return;
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}
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// 巡逻计时
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_patrolTimer += Time.deltaTime;
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if (_patrolTimer >= bellPatrolTime)
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{
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_state = State.Idle;
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return;
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}
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// 朝巡逻点移动
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float dist = XZDistance(transform.position, _patrolTarget);
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if (dist <= 0.5f)
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{
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// 到达巡逻点，选择新的巡逻点
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PickNewPatrolPoint();
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}
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else
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{
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MoveToward(_patrolTarget, chaseSpeed * 0.7f); // 巡逻时速度稍慢
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}
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}
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// ===== 摇铃事件回调（由 EchoSystem.OnEchoReleased 触发）=====
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private void OnBell(Vector3 bellPos)
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{
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if (playerTarget == null) return;
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// 只有在聆听范围内才响应
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if (XZDistance(transform.position, bellPos) > listenRange) return;
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// 设置铃铛目标位置
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_bellTargetPosition = bellPos;
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_bellChaseTimer = 0f;
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// 切换到追击铃铛状态（可以打断任何状态）
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_state = State.ChasingBell;
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}
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/// <summary>
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/// 选择新的巡逻点
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/// </summary>
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private void PickNewPatrolPoint()
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{
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// 在巡逻中心周围随机选择一个点
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Vector2 randomDir = Random.insideUnitCircle * bellPatrolRadius;
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_patrolTarget = _patrolCenter + new Vector3(randomDir.x, 0f, randomDir.y);
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}
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/// <summary>
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/// 检测是否能看到玩家（射线检测）
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/// </summary>
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private bool CanSeePlayer()
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{
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if (playerTarget == null) return false;
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// 射线起点（稍微抬高，避免从地面发射）
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Vector3 rayStart = transform.position + Vector3.up * rayOffsetY;
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Vector3 rayEnd = playerTarget.position + Vector3.up * rayOffsetY;
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Vector3 dir = rayEnd - rayStart;
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float dist = dir.magnitude;
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// 调试：在Scene视图中绘制射线
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Debug.DrawLine(rayStart, rayEnd, CanSeePlayerDebugColor());
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// 发射射线，只检测障碍物层
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if (Physics.Raycast(rayStart, dir.normalized, out RaycastHit hit, dist, obstacleLayers))
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{
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// 击中了物体
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Debug.DrawLine(rayStart, hit.point, Color.red);
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// 如果击中的是玩家，说明可以看到
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if (hit.transform == playerTarget)
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{
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return true;
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}
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// 击中了其他物体（被遮挡）
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return false;
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}
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// 没有击中任何物体 = 没有遮挡 = 可以看到玩家
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return true;
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}
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/// <summary>
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/// 调试用：根据是否能看到玩家返回不同颜色
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/// </summary>
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private Color CanSeePlayerDebugColor()
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{
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if (playerTarget == null) return Color.gray;
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Vector3 rayStart = transform.position + Vector3.up * rayOffsetY;
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Vector3 rayEnd = playerTarget.position + Vector3.up * rayOffsetY;
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Vector3 dir = rayEnd - rayStart;
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float dist = dir.magnitude;
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if (Physics.Raycast(rayStart, dir.normalized, out RaycastHit hit, dist, obstacleLayers))
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{
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return hit.transform == playerTarget ? Color.green : Color.red;
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}
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return Color.green; // 没有遮挡
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}
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// ===== 工具方法 =====
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private void MoveToward(Vector3 target, float speed)
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{
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Vector3 dir = new Vector3(
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target.x - transform.position.x,
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0f,
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target.z - transform.position.z
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);
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float dist = dir.magnitude;
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if (dist < 0.01f) return;
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dir /= dist;
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Vector3 move = dir * speed * Time.deltaTime;
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if (move.magnitude > dist) move = dir * dist; // 不越过目标
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transform.position += new Vector3(move.x, 0f, move.z);
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}
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private float XZDistance(Vector3 a, Vector3 b)
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{
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float dx = a.x - b.x;
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float dz = a.z - b.z;
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return Mathf.Sqrt(dx * dx + dz * dz);
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}
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// ===== 编辑器可视化 =====
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private void OnDrawGizmosSelected()
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{
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// 根据状态显示不同颜色
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Color stateColor = Color.white;
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switch (_state)
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{
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case State.Idle: stateColor = Color.gray; break;
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case State.ChasingPlayer: stateColor = Color.red; break;
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case State.ChasingBell: stateColor = Color.yellow; break;
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case State.PatrollingBell: stateColor = Color.cyan; break;
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}
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// 绘制当前状态指示
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Gizmos.color = stateColor;
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Gizmos.DrawWireSphere(transform.position, 0.5f);
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// 绘制聆听范围
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Gizmos.color = new Color(0f, 0.85f, 1f, 0.3f);
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Gizmos.DrawWireSphere(transform.position, listenRange);
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// 绘制停止距离
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Gizmos.color = new Color(1f, 0.3f, 0.3f, 0.3f);
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Gizmos.DrawWireSphere(transform.position, stopDistance);
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// 绘制铃铛目标（如果在追击铃铛或巡逻）
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if (_state == State.ChasingBell || _state == State.PatrollingBell)
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{
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Gizmos.color = Color.yellow;
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Gizmos.DrawWireSphere(_bellTargetPosition, bellArriveDistance);
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// 绘制到铃铛的连线
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Gizmos.DrawLine(transform.position, _bellTargetPosition);
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}
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// 绘制巡逻范围（如果在巡逻）
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if (_state == State.PatrollingBell)
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{
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Gizmos.color = Color.cyan;
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Gizmos.DrawWireSphere(_patrolCenter, bellPatrolRadius);
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// 绘制当前巡逻目标
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Gizmos.color = Color.green;
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Gizmos.DrawWireSphere(_patrolTarget, 0.3f);
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}
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}
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/// <summary>当前状态（调试用）</summary>
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public string CurrentState => _state.ToString();
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}
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}
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