提交

2025-05-16 22:44:59 +08:00
parent a0e0ab6ea0
commit c69da76dbd
1 changed files with 38 additions and 36 deletions
@@ -215,45 +215,47 @@ public class GearFollowerWithVisualCut : MonoBehaviour
        }
    }

-    private void MoveAlongEdge(Vector2 mousePos)
+   private void MoveAlongEdge(Vector2 mousePos)
+{
+    // 当前段的两个点
+    Vector2 a = edgePoints[currentEdgeIndex];
+    Vector2 b = edgePoints[currentEdgeIndex + 1];
+
+    // 投影鼠标位置到当前段
+    Vector2 projected = ProjectPointOnSegment(mousePos, a, b);
+
+    // 鼠标离齿轮足够远才移动（模拟牵引力）
+    float tractionThreshold = 0.1f;
+    float distToMouse = Vector2.Distance(transform.position, mousePos);
+    if (distToMouse < tractionThreshold)
+        return;
+
+    // 移动齿轮朝向投影点
+    transform.position = Vector2.MoveTowards(transform.position, projected, tractionSpeed * Time.deltaTime);
+
+    // 标记切割
+    if (!cutSegments[currentEdgeIndex])
    {
-        float closestDist = float.MaxValue;
-        Vector2 closestPoint = Vector2.zero;
-        int closestSegmentStartIndex = 0;
-
-        for (int i = 0; i < edgePoints.Count - 1; i++)
-        {
-            Vector2 a = edgePoints[i];
-            Vector2 b = edgePoints[i + 1];
-
-            Vector2 projected = ProjectPointOnSegment(mousePos, a, b);
-            float dist = Vector2.Distance(mousePos, projected);
-
-            if (dist < closestDist)
-            {
-                closestDist = dist;
-                closestPoint = projected;
-                closestSegmentStartIndex = i;
-            }
-        }
-
-        float stopThreshold = 0.05f;
-        if (Vector2.Distance(transform.position, closestPoint) < stopThreshold)
-        {
-            return;
-        }
-
-        transform.position = Vector2.MoveTowards(transform.position, closestPoint, tractionSpeed * Time.deltaTime);
-        currentEdgeIndex = closestSegmentStartIndex;
-
-        // 标记当前线段已被切割
-        if (!cutSegments[currentEdgeIndex])
-        {
-            cutSegments[currentEdgeIndex] = true;
-            Debug.Log($"切割了线段 {currentEdgeIndex} ({edgePoints[currentEdgeIndex]}->{edgePoints[currentEdgeIndex + 1]})");
-        }
+        cutSegments[currentEdgeIndex] = true;
+        Debug.Log($"切割线段 {currentEdgeIndex} ({a}->{b})");
    }

+    // 判断是否前进或后退段
+    float switchThreshold = 0.05f;
+
+    // 往前走（靠近 b 点且还有下一段）
+    if (Vector2.Distance(projected, b) < switchThreshold && currentEdgeIndex < edgePoints.Count - 2)
+    {
+        currentEdgeIndex++;
+    }
+    // 往后退（靠近 a 点且还有上一段）
+    else if (Vector2.Distance(projected, a) < switchThreshold && currentEdgeIndex > 0)
+    {
+        currentEdgeIndex--;
+    }
+}
+
+
    private int FindNearestEdgePointIndex(Vector2 pos, out float minDist)
    {
        int nearestIndex = 0;