95 lines
3.6 KiB
C#
95 lines
3.6 KiB
C#
using UnityEngine;
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using IndianOceanAssets.Engine2_5D;
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namespace IndianOceanAssets.Engine2_5D
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{
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/// <summary>
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/// 敌人头顶血条 —— 挂在敌人 Prefab 上。
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/// 血条可视化物体（BG、Fill）已在 Prefab 中预建，运行时直接引用，无需动态创建。
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///
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/// 解耦改造：直接引用同物体上的 HealthSystem（RequireComponent 保证存在），
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/// 订阅其 OnHealthChanged 事件刷新，彻底移除对私有字段的反射读取。
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/// 注意：不使用"全局共享 IntVariable"承载敌人血量——否则所有敌人血条会显示同一份血量，
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/// 正确的解法是"每个敌人读自己的 HealthSystem"（同物体组件引用，非 Find / 反射 / 跨对象）。
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/// </summary>
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[RequireComponent(typeof(HealthSystem))]
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public class EnemyHealthBar : MonoBehaviour
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{
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[Header("血条引用（Prefab 中预建）")]
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[SerializeField] private Transform barRoot;
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[SerializeField] private SpriteRenderer bgRenderer;
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[SerializeField] private SpriteRenderer fillRenderer;
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[Header("血条参数")]
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[Tooltip("血条宽度（世界单位）")]
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[SerializeField] private float barWidth = 1f;
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[Tooltip("血条高度（世界单位）")]
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[SerializeField] private float barHeight = 0.1f;
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[Header("颜色")]
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[SerializeField] private Color fillColor = new Color(0.8f, 0.1f, 0.1f, 0.9f);
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[SerializeField] private Color lowHealthColor = new Color(1f, 0.3f, 0f, 0.9f);
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[Tooltip("低于此比例时切换为低血量颜色")]
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[SerializeField] private float lowHealthThreshold = 0.3f;
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[Header("显示控制")]
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[Tooltip("满血时是否隐藏血条")]
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[SerializeField] private bool hideWhenFull = false;
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// 同物体上的 HealthSystem（RequireComponent 保证存在；非 Find / 反射 / 跨对象引用）
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private HealthSystem _healthSource;
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private void Start()
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{
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if (fillRenderer == null || bgRenderer == null)
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{
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enabled = false;
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return;
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}
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_healthSource = GetComponent<HealthSystem>();
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if (_healthSource != null)
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{
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_healthSource.OnHealthChanged += UpdateBar;
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UpdateBar(_healthSource.CurrentHealth, _healthSource.MaxHealth);
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}
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else
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{
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UpdateBar(1, 1);
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}
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}
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private void OnDestroy()
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{
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if (_healthSource != null)
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_healthSource.OnHealthChanged -= UpdateBar;
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}
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/// <summary>
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/// 根据当前血量更新血条显示（事件驱动，无反射、无每帧 LateUpdate）。
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/// </summary>
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private void UpdateBar(int currentHealth, int maxHealth)
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{
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if (fillRenderer == null || bgRenderer == null) return;
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if (maxHealth <= 0) maxHealth = 1;
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float ratio = Mathf.Clamp01((float)currentHealth / maxHealth);
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// 更新填充条缩放（居中对齐）
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fillRenderer.transform.localScale = new Vector3(barWidth * ratio, barHeight, 1f);
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fillRenderer.transform.localPosition = new Vector3(
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-(barWidth * (1f - ratio)) * 0.5f, 0f, 0f);
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// 低血量变色
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fillRenderer.color = ratio <= lowHealthThreshold ? lowHealthColor : fillColor;
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// 满血隐藏
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bool visible = !(hideWhenFull && ratio >= 1f);
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bgRenderer.enabled = visible;
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fillRenderer.enabled = visible;
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}
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}
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}
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