备份CatanBuilding瘦身独立工程

Assets/Scripts/UIExtend/ScreenSpaceTrail.cs

@@ -0,0 +1,41 @@
+using UnityEngine;
+using UnityEngine.UI;
+
+[RequireComponent(typeof(RectTransform), typeof(TrailRenderer))]
+public class ScreenSpaceTrail : MonoBehaviour
+{
+    private RectTransform rectTransform;
+    private TrailRenderer trail;
+    private Camera uiCamera;
+
+    void Start()
+    {
+        rectTransform = GetComponent<RectTransform>();
+        trail = GetComponent<TrailRenderer>();
+        uiCamera = GetComponentInParent<Canvas>().worldCamera;
+    }
+
+    void Update()
+    {
+        UpdateTrailPosition();
+    }
+
+    void UpdateTrailPosition()
+    {
+        // 将UI坐标转换为世界坐标
+        Vector3 screenPos = RectTransformUtility.WorldToScreenPoint(
+            uiCamera,
+            rectTransform.position);
+
+        // 设置Z值在相机近裁剪面稍前方
+        Vector3 worldPos = uiCamera.ScreenToWorldPoint(
+            new Vector3(screenPos.x, screenPos.y, uiCamera.nearClipPlane + 0.1f));
+
+        transform.position = worldPos;
+    }
+
+    public void ClearTrail()
+    {
+        trail.Clear();
+    }
+}