fix(heatmap): 按Sprite几何中心旋转风扇避免散架

Co-authored-by: Cursor <cursoragent@cursor.com>

Assets/GameContent/Feature_FixSystem/Art/温控器/温控器2.aseprite.meta

@@ -122,7 +122,7 @@ ScriptedImporter:
   - name: "\xE9\xA3\x8E\xE6\x89\x87"
     originalName: 
     pivot: {x: 0.5, y: 0.5}
-    alignment: 0
+    alignment: 9
     border: {x: 0, y: 0, z: 0, w: 0}
     rect:
       serializedVersion: 2

Assets/Scripts/FixSystem/HeatMap/HeatMapController.cs

@@ -21,6 +21,8 @@ public class HeatMapController : MonoBehaviour
     public RectTransform imageToMove; // 需要移动的Image
     public Transform imageToRotate; // 需要旋转的Image
     [SerializeField, Min(0f)] private float fanStopDuration = 0.15f;
+    [Tooltip("相对 Sprite 矩形中心的额外旋转轴偏移（本地空间，单位与 Transform 一致）。用于校准扇毂不在图心时的偏心。")]
+    [SerializeField] private Vector2 fanPivotLocalOffset;
     [Header("低温背景")]
     [SerializeField] private Color coldBaseColor = new Color(0.005f, 0.02f, 0.55f, 1f);
     [SerializeField] private Color coldHighlightColor = new Color(0f, 0.3f, 1f, 1f);
@@ -45,6 +47,9 @@ public class HeatMapController : MonoBehaviour
     private Tween _temptureTween;
     private Tween _fanSpeedTween;
     private float _fanAngularSpeed;
+    private SpriteRenderer _fanRenderer;
+    private Vector3 _fanLocalPivot; // 相对 imageToRotate 的本地旋转轴
+    private bool _fanPivotReady;
 
     private const float FanAngularSpeed = 1800f;
 
@@ -145,13 +150,53 @@ public class HeatMapController : MonoBehaviour
         if (imageToRotate == null || Mathf.Approximately(_fanAngularSpeed, 0f))
             return;
 
-        imageToRotate.Rotate(0f, 0f, _fanAngularSpeed * Time.deltaTime, Space.Self);
+        EnsureFanPivot();
+        float angle = _fanAngularSpeed * Time.deltaTime;
+        // 绕 Sprite 几何中心转，避免 pivot 不在扇叶中心时整圈公转（看起来像散架）。
+        Vector3 worldPivot = imageToRotate.TransformPoint(_fanLocalPivot);
+        imageToRotate.RotateAround(worldPivot, imageToRotate.forward, angle);
+    }
+
+    private void EnsureFanPivot()
+    {
+        if (_fanPivotReady)
+            return;
+
+        _fanLocalPivot = Vector3.zero;
+        if (imageToRotate == null)
+        {
+            _fanPivotReady = true;
+            return;
+        }
+
+        _fanRenderer = imageToRotate.GetComponent<SpriteRenderer>();
+        if (_fanRenderer != null && _fanRenderer.sprite != null)
+        {
+            var sprite = _fanRenderer.sprite;
+            // transform 在 sprite.pivot；矩形几何中心相对 pivot 的本地偏移。
+            // Aseprite Canvas 空间 pivot 会远超出 [0,1]，直接 Rotate 会整圈公转。
+            Vector2 size = sprite.rect.size;
+            Vector2 pivotPx = sprite.pivot;
+            float ppu = sprite.pixelsPerUnit;
+            if (ppu > 0f)
+            {
+                _fanLocalPivot = new Vector3(
+                    (size.x * 0.5f - pivotPx.x) / ppu,
+                    (size.y * 0.5f - pivotPx.y) / ppu,
+                    0f);
+            }
+        }
+
+        _fanLocalPivot += (Vector3)fanPivotLocalOffset;
+        _fanPivotReady = true;
     }
 
     private void StartFan()
     {
         _fanSpeedTween?.Kill();
         _fanSpeedTween = null;
+        _fanPivotReady = false;
+        EnsureFanPivot();
         _fanAngularSpeed = FanAngularSpeed;
     }
 
@@ -182,6 +227,7 @@ public class HeatMapController : MonoBehaviour
     void Start()
     {
         bodyModuleSystem = FindObjectOfType<BodyModuleSystem>();
+        EnsureFanPivot();
         SetDataToMaterial();
     }
 
@@ -319,4 +365,34 @@ public class HeatMapController : MonoBehaviour
             .SetEase(Ease.InOutQuad)
             .SetTarget(this);
     }
+
+#if UNITY_EDITOR
+    private void OnDrawGizmosSelected()
+    {
+        if (imageToRotate == null)
+            return;
+
+        // 编辑器下也能预览旋转轴（不依赖 Play 时缓存）。
+        var sr = imageToRotate.GetComponent<SpriteRenderer>();
+        Vector3 localPivot = (Vector3)fanPivotLocalOffset;
+        if (sr != null && sr.sprite != null && sr.sprite.pixelsPerUnit > 0f)
+        {
+            var sprite = sr.sprite;
+            Vector2 size = sprite.rect.size;
+            Vector2 pivotPx = sprite.pivot;
+            float ppu = sprite.pixelsPerUnit;
+            localPivot += new Vector3(
+                (size.x * 0.5f - pivotPx.x) / ppu,
+                (size.y * 0.5f - pivotPx.y) / ppu,
+                0f);
+        }
+
+        Vector3 worldPivot = imageToRotate.TransformPoint(localPivot);
+        Gizmos.color = new Color(1f, 0.45f, 0.1f, 0.9f);
+        Gizmos.DrawWireSphere(worldPivot, 0.08f);
+        Gizmos.color = new Color(0.3f, 0.9f, 0.55f, 0.7f);
+        Gizmos.DrawLine(worldPivot + Vector3.left * 0.2f, worldPivot + Vector3.right * 0.2f);
+        Gizmos.DrawLine(worldPivot + Vector3.down * 0.2f, worldPivot + Vector3.up * 0.2f);
+    }
+#endif
 }