更新敌人血量功能

2026-07-01 00:30:19 +08:00
parent cecf63a77c
commit dfeed78298
7 changed files with 538 additions and 2 deletions
@@ -0,0 +1,97 @@
+using UnityEngine;
+
+namespace IndianOceanAssets.Engine2_5D
+{
+    /// <summary>
+    /// 敌人头顶血条 —— 挂在敌人 Prefab 上。
+    /// 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。
+    /// </summary>
+    [RequireComponent(typeof(HealthSystem))]
+    public class EnemyHealthBar : MonoBehaviour
+    {
+        [Header("血条引用（Prefab 中预建）")]
+        [SerializeField] private Transform barRoot;
+        [SerializeField] private SpriteRenderer bgRenderer;
+        [SerializeField] private SpriteRenderer fillRenderer;
+
+        [Header("血条参数")]
+        [Tooltip("血条宽度（世界单位）")]
+        [SerializeField] private float barWidth = 1f;
+
+        [Tooltip("血条高度（世界单位）")]
+        [SerializeField] private float barHeight = 0.1f;
+
+        [Header("颜色")]
+        [SerializeField] private Color fillColor = new Color(0.8f, 0.1f, 0.1f, 0.9f);
+        [SerializeField] private Color lowHealthColor = new Color(1f, 0.3f, 0f, 0.9f);
+
+        [Tooltip("低于此比例时切换为低血量颜色")]
+        [SerializeField] private float lowHealthThreshold = 0.3f;
+
+        [Header("显示控制")]
+        [Tooltip("满血时是否隐藏血条")]
+        [SerializeField] private bool hideWhenFull = false;
+
+        private HealthSystem _healthSystem;
+        private int _lastHealth = -1;
+        private int _maxHealth;
+
+        private void Start()
+        {
+            _healthSystem = GetComponent<HealthSystem>();
+            if (_healthSystem == null)
+            {
+                enabled = false;
+                return;
+            }
+
+            // 获取 maxHealth（通过反射读取私有字段）
+            var field = typeof(HealthSystem).GetField("maxHealth",
+                System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
+            if (field != null)
+                _maxHealth = (int)field.GetValue(_healthSystem);
+            else
+                _maxHealth = 3;
+
+            UpdateBar();
+        }
+
+        private void LateUpdate()
+        {
+            UpdateBar();
+        }
+
+        /// <summary>
+        /// 根据当前血量更新血条显示。
+        /// </summary>
+        private void UpdateBar()
+        {
+            if (_healthSystem == null || fillRenderer == null || bgRenderer == null) return;
+
+            // 获取当前血量（反射）
+            var healthField = typeof(HealthSystem).GetField("health",
+                System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
+            int currentHealth = healthField != null ? (int)healthField.GetValue(_healthSystem) : _maxHealth;
+
+            // 血量没变化则跳过（性能优化）
+            if (currentHealth == _lastHealth) return;
+            _lastHealth = currentHealth;
+
+            float ratio = Mathf.Clamp01((float)currentHealth / _maxHealth);
+
+            // 更新填充条缩放（居中对齐）
+            fillRenderer.transform.localScale = new Vector3(barWidth * ratio, barHeight, 1f);
+            fillRenderer.transform.localPosition = new Vector3(
+                -(barWidth * (1f - ratio)) * 0.5f, 0f, 0f);
+
+            // 低血量变色
+            fillRenderer.color = ratio <= lowHealthThreshold ? lowHealthColor : fillColor;
+
+            // 满血隐藏
+            bool visible = !(hideWhenFull && ratio >= 1f);
+            bgRenderer.enabled = visible;
+            fillRenderer.enabled = visible;
+        }
+    }
+}