Cielonos/Assets/Scripts/MainGame/Items/PassiveEquipments/VipersFang.cs

using System;
using Cielonos.MainGame.Characters;
using SLSUtilities.General;
using UnityEngine;

namespace Cielonos.MainGame.Inventory.Collections
{
    /// <summary>
    /// 蝮蛇之牙 / Viper's Fang
    /// 每次攻击根据敌人当前已经损失的生命百分比，增加额外伤害（最大增加 20 伤害）
    /// </summary>
    public partial class VipersFang : PassiveEquipmentBase
    {
        public override void OnObtained()
        {
            base.OnObtained();
            Action<AttackAreaBase, CharacterBase, Attack.Context> onStartAttack = OnStartAttack;
            player.eventSm.onStartAttack.Add("VipersFang", onStartAttack.ToPrioritized());
        }
    }

    public partial class VipersFang
    {
        private void OnStartAttack(AttackAreaBase attackArea, CharacterBase target, Attack.Context attackContext)
        {
            float targetHealthPercentage = target.attributeSm[CharacterAttribute.Health] / target.attributeSm[CharacterAttribute.MaximumHealth];
            float extraDamage = passiveAttributeData.itemAttributes["ExtraDamage"] * (1 - targetHealthPercentage);
            attackContext.value.additionalFlatDamage += extraDamage;
        }
    }
}