157 lines
8.4 KiB
C#
157 lines
8.4 KiB
C#
using BaseGames.AI;
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namespace BaseGames.Enemies
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{
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/// <summary>
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/// 可复用的"待机/警觉/追击/巡逻"感知状态机（统一规则，见 spec《敌人感知↔状态》）。
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/// 纯决策：AI 只决定"进哪个状态 / 转换条件 / 每状态的移动意图或攻击能力"；
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/// 移动/朝向/动画/伤害的实现全部在 EnemyLocomotion 或攻击能力里（AI 不 actuate）。
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/// 规则：
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/// 待机/巡逻: 在追逐区→追击(优先); 否则 有警觉且在视野→警觉; 否则保持。
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/// 警觉: 在追逐区→追击; 否则 脱离视野→R; 否则保持警觉(朝向玩家)。
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/// 追击: 脱离全部感知(追逐区且视野区都不在)→R（永不回警觉）。
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/// 缺省自动降级：无警觉(HasAlert=false)→警觉分支不触发。
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/// 交战风格(Engagement)：默认 ChaseAbility=单一冲锋能力节点；
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/// ApproachAttack=把追击换成 Approach(寻路逼近)↔Attack(到射程选招攻击、攻击时停逼近) 两态子机，
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/// 打完回逼近重判、脱离全部感知区→R。
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/// </summary>
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public static class PerceptionStateMachine
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{
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/// <summary>交战风格：单一冲锋能力，或"寻路逼近 + 选招攻击"两态子机。</summary>
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public enum EngagementStyle { ChaseAbility, ApproachAttack }
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public sealed class Config
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{
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public string Idle = "Idle";
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public string Patrol = "Patrol";
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public string Alert = "Alert";
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public string Chase = "Chase";
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public string Death = "Death";
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public string Entry = "Idle"; // 初始态
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public string Rest = "Patrol"; // R：降级(退出追击/警觉丢失)回到的静止态
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// 待机/巡逻/警觉的移动意图（由 EnemyLocomotion 执行）
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public LocomotionMode IdleMode = LocomotionMode.Idle;
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public LocomotionMode PatrolMode = LocomotionMode.Patrol;
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public LocomotionMode AlertMode = LocomotionMode.Face; // 停 + 朝向玩家
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// 追击/死亡走能力（追击=接触伤害等战斗语义）
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public string ChaseAbilityId;
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public string DeathAbilityId;
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// 追击=带冷却的冲刺能力时开启（opt-in）：冲刺打完→巡逻(CD 期)，冷却结束且仍在追逐区→再冲刺。
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// 由冷却门控 Patrol→Chase，避免"CD 期在追逐区每帧 Chase↔Patrol 来回抖"。
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public bool PatrolBetweenChases = false;
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// 交战风格（默认冲锋能力，保持现状）；ApproachAttack 时启用 Approach↔Attack 两态子机。
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public EngagementStyle Engagement = EngagementStyle.ChaseAbility;
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public string ApproachState = "Approach";
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public string AttackState = "Attack";
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}
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public static void Add(BrainBuilder b, Config c)
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{
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b.Entry(c.Entry);
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b.Global().To(c.Death).OnEvent(AiSignal.Died); // 受击致死 → 死亡（全局最高优先）
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// 进追击的条件：默认"在追逐区"。PatrolBetweenChases 时加冷却门——CD 中不回追击，
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// 使 Chase(冲刺)→Patrol(CD 巡逻)→Chase 循环不抖动。冷却门仅在冲锋能力风格下生效。
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string chaseId = c.ChaseAbilityId;
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System.Func<IAiContext, bool> canChase;
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string chaseLabel;
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if (c.Engagement == EngagementStyle.ChaseAbility && c.PatrolBetweenChases)
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{
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canChase = x => x.Sensor.InChaseZone() && x.Combat.CanUseAbility(chaseId);
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chaseLabel = "InChaseZone+offCD";
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}
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else
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{
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canChase = x => x.Sensor.InChaseZone();
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chaseLabel = "InChaseZone";
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}
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// 交战入口态：冲锋风格=Chase；逼近风格=Approach
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string combatEntry = c.Engagement == EngagementStyle.ApproachAttack ? c.ApproachState : c.Chase;
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// 待机 / 巡逻：未发现态，升级转换相同（追逐优先、其次警觉）
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AddLocomotionState(b, c.Idle, c.IdleMode)
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.To(combatEntry).When(canChase, chaseLabel)
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.To(c.Alert).When(x => HasAlert(x) && x.Sensor.InVisionZone(), "InVision+HasAlert");
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AddLocomotionState(b, c.Patrol, c.PatrolMode)
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.To(combatEntry).When(canChase, chaseLabel)
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.To(c.Alert).When(x => HasAlert(x) && x.Sensor.InVisionZone(), "InVision+HasAlert");
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// 警觉（仅升级路径出现）：进追逐区→追击；脱离视野→R；在视野内保持(朝向玩家)
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AddLocomotionState(b, c.Alert, c.AlertMode)
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.To(combatEntry).When(canChase, chaseLabel)
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.To(c.Rest).When(x => !x.Sensor.InVisionZone(), "leftVision");
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if (c.Engagement == EngagementStyle.ApproachAttack)
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{
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// Approach：寻路逼近；有招够得着→Attack；脱离全部感知→R
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b.State(c.ApproachState)
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.OnEnter(x => x.Locomotion.Pursue(x.Sensor.LastKnown))
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.Tick(x => x.Locomotion.Pursue(x.Sensor.LastKnown))
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.OnExit(x => x.Locomotion.Stop())
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.To(c.AttackState).When(x => x.Combat.HasEligibleAttack(), "attackInRange")
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.To(c.Rest).When(x => !x.Sensor.InChaseZone() && !x.Sensor.InVisionZone(), "leftAllZones");
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// Attack：停逼近 + 选招攻击；打完回 Approach；脱离感知→R
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b.State(c.AttackState)
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.OnEnter(x => { x.Locomotion.Stop(); x.Combat.UseBestAttack(); })
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.OnExit(x => x.Combat.InterruptAbilities())
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.To(c.ApproachState).When(x => !x.Combat.IsAbilityRunning(), "attackDone")
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.To(c.Rest).When(x => !x.Sensor.InChaseZone() && !x.Sensor.InVisionZone(), "leftAllZones");
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}
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else
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{
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// 追击退出：
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// PatrolBetweenChases: 冲刺打完(能力结束)→R(CD 期巡逻)；committed 冲锋不被感知丢失中途打断，
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// 是否再冲刺交由 Patrol 侧冷却门控。
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// 默认: 脱离全部感知(追逐区且视野区都不在)→R（永不回警觉）。
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var chase = AddAbilityState(b, c.Chase, chaseId);
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if (c.PatrolBetweenChases)
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chase.To(c.Rest).When(x => !x.Combat.IsAbilityRunning(chaseId), "dashDone→CD");
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else
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chase.To(c.Rest).When(x => !x.Sensor.InChaseZone() && !x.Sensor.InVisionZone(), "leftAllZones");
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}
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// 死亡：终态（无转出）；死亡演出走物理状态机
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AddAbilityState(b, c.Death, c.DeathAbilityId);
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}
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/// <summary>
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/// 一个"由 EnemyLocomotion 驱动"的状态：进入/每帧声明移动意图，离开时停。
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/// Face 模式每帧朝向最后已知玩家位置（Sensor.LastKnown 由 EnemyBrainContext.Refresh 维护）。
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/// </summary>
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static BrainBuilder.StateBuilder AddLocomotionState(BrainBuilder b, string state, LocomotionMode mode)
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{
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return b.State(state)
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.OnEnter(x => ApplyLocomotion(x, mode))
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.Tick(x => ApplyLocomotion(x, mode))
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.OnExit(x => x.Locomotion.Stop());
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}
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static void ApplyLocomotion(IAiContext x, LocomotionMode mode)
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{
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if (mode == LocomotionMode.Face) x.Locomotion.Face(x.Sensor.LastKnown);
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else x.Locomotion.SetMode(mode);
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}
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/// <summary>一个"由攻击能力驱动"的状态：进入/每帧确保能力运行(受击打断后重触发)，离开中断。</summary>
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static BrainBuilder.StateBuilder AddAbilityState(BrainBuilder b, string state, string abilityId)
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{
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return b.State(state)
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.OnEnter(x => EnsureAbility(x, abilityId))
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.Tick(x => EnsureAbility(x, abilityId))
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.OnExit(x => x.Combat.InterruptAbilities());
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}
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static void EnsureAbility(IAiContext x, string abilityId)
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{
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if (!string.IsNullOrEmpty(abilityId) && !x.Combat.IsAbilityRunning(abilityId))
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x.Combat.UseAbility(abilityId);
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}
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static bool HasAlert(IAiContext x) => x is IEnemyActor a && a.HasAlertState;
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}
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}
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