84 lines
3.1 KiB
C#
84 lines
3.1 KiB
C#
using System;
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using Cielonos.MainGame.Buffs.Character;
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using Cielonos.MainGame.Characters;
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using SLSUtilities.General;
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namespace Cielonos.MainGame.Inventory.Collections
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{
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/// <summary>
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/// 时空乱流 / Spacetime Turbulence
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/// 降低直接攻击伤害，并将被降低的部分转化为 Decay。
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/// </summary>
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public class SpacetimeTurbulence : PassiveEquipmentBase
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{
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private const string EventKey = nameof(SpacetimeTurbulence);
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private const string DamageReductionAttribute = "DamageReduction";
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private const string DecayMultiplierAttribute = "DecayMultiplier";
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// 数值越高越先执行；减伤应处于 onBeforeDamageApplied 的末端。
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private const int BeforeDamagePriority = -100;
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// 让 Decay 在攻击完成后尽早施加，供后续攻击完成事件和受击事件读取。
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private const int FinishAttackPriority = 100;
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public override void OnObtained()
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{
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base.OnObtained();
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Action<AttackAreaBase, CharacterBase, Attack.Result> onBeforeDamageApplied = OnBeforeDamageApplied;
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player.eventSm.onBeforeDamageApplied.InsertByPriority(
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EventKey, onBeforeDamageApplied.ToPrioritized(BeforeDamagePriority));
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Action<AttackAreaBase, CharacterBase, Attack.Result> onFinishAttack = OnFinishAttack;
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player.eventSm.onFinishAttack.InsertByPriority(
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EventKey, onFinishAttack.ToPrioritized(FinishAttackPriority));
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}
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public override void OnDiscarded()
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{
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player.eventSm.onBeforeDamageApplied.Remove(EventKey);
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player.eventSm.onFinishAttack.Remove(EventKey);
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base.OnDiscarded();
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}
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private void OnBeforeDamageApplied(AttackAreaBase attackArea, CharacterBase target, Attack.Result result)
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{
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if (target is not Enemy)
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{
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return;
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}
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result.value.damageMultiplier *= (1 - passiveAttributeSm.GetItemAttribute(DamageReductionAttribute));
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}
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private void OnFinishAttack(AttackAreaBase attackArea, CharacterBase target, Attack.Result result)
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{
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if (target is not Enemy || result.causedDeath)
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{
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return;
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}
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float reducedDamage = result.finalDamage + result.shieldBlockedDamage;
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if (reducedDamage <= 0f)
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{
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return;
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}
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float damageMultiplier = (1 - passiveAttributeSm.GetItemAttribute(DamageReductionAttribute));
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if (damageMultiplier <= 0f)
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{
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return;
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}
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// 当前直接伤害为原伤害的 damageMultiplier，反推被降低部分后再乘 Decay 系数。
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float decayDamage = reducedDamage * (1f - damageMultiplier) / damageMultiplier;
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decayDamage *= passiveAttributeSm.GetItemAttribute(DecayMultiplierAttribute);
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if (decayDamage <= 0f)
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{
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return;
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}
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new Decay(decayDamage).Apply(target, player, this);
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}
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}
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}
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