From 7b8c648f66503d8dc79a9480741a8e6b66bab25e Mon Sep 17 00:00:00 2001
From: bottlefish <781230111@qq.com>
Date: Sat, 17 May 2025 03:43:37 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E8=BF=9B=E5=BA=A6=E6=8C=87?=
 =?UTF-8?q?=E7=A4=BA?=
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---
 .../FixSystemNew/BodyModule/GearFollower.cs   | 100 +++++++++++++++++-
 1 file changed, 99 insertions(+), 1 deletion(-)

diff --git a/Assets/Scripts/FixSystemNew/BodyModule/GearFollower.cs b/Assets/Scripts/FixSystemNew/BodyModule/GearFollower.cs
index 66875f694..494fa6518 100644
--- a/Assets/Scripts/FixSystemNew/BodyModule/GearFollower.cs
+++ b/Assets/Scripts/FixSystemNew/BodyModule/GearFollower.cs
@@ -1,5 +1,4 @@
 using System.Collections.Generic;
-using System.Linq;
 using UnityEngine;
 
 public class GearFollower : MonoBehaviour
@@ -10,6 +9,15 @@ public class GearFollower : MonoBehaviour
     public float detachDistance = 1.0f;
     public float tractionSpeed = 2f;
 
+    [Header("切割效果参数")]
+    public float cutEdgeExpandDuration = 0.5f;   // 卷边展开时间
+    public float cutEdgeCoolDuration = 3f;       // 冷却时间
+    public float cutEdgeMaxOffset = 0.05f;       // 卷边最大偏移量
+
+    public Gradient cutEdgeColorGradient;        // 颜色渐变（从高温到冷却）
+
+    public Material cutEdgeMaterial;              // 用于绘制卷边的材质
+
     private List<Vector2> edgePoints;
     private int currentEdgeIndex = 0;
     private int tractionDirection = 1;
@@ -19,6 +27,15 @@ public class GearFollower : MonoBehaviour
 
     private Camera mainCamera;
 
+    // 记录切割的边段及其动画状态
+    private class CutSegment
+    {
+        public int startIndex;
+        public float timeElapsed;  // 0~卷边展开+冷却总时长
+        public LineRenderer lineRenderer;
+    }
+    private List<CutSegment> cutSegments = new List<CutSegment>();
+
     void Start()
     {
         mainCamera = Camera.main;
@@ -43,6 +60,8 @@ public class GearFollower : MonoBehaviour
                 UpdateTractionState(mouseWorldPos);
                 break;
         }
+
+        UpdateCutSegments();
     }
 
     private void LoadEdgePointsFromSprite()
@@ -177,6 +196,9 @@ public class GearFollower : MonoBehaviour
             // 如果到达段末，前进一段
             if (Vector2.Distance(targetPoint, to) < 0.01f)
             {
+                // 记录切割痕迹
+                AddCutSegment(currentEdgeIndex);
+
                 currentEdgeIndex = nextIndex;
             }
         }
@@ -186,6 +208,82 @@ public class GearFollower : MonoBehaviour
         }
     }
 
+    // 添加一个切割段，生成卷边视觉效果
+    private void AddCutSegment(int startIndex)
+    {
+        // 防止重复添加同一段（可选）
+        foreach (var seg in cutSegments)
+        {
+            if (seg.startIndex == startIndex)
+                return;
+        }
+
+        GameObject go = new GameObject($"CutSegment_{startIndex}");
+        go.transform.parent = transform.parent; // 放在GearFollower同级方便管理
+
+        LineRenderer lr = go.AddComponent<LineRenderer>();
+        lr.positionCount = 4; // 画一个四点的矩形条表示卷边
+        lr.material = cutEdgeMaterial != null ? cutEdgeMaterial : new Material(Shader.Find("Sprites/Default"));
+        lr.widthCurve = AnimationCurve.Constant(0, 1, 0.05f);
+        lr.numCapVertices = 4;
+        lr.useWorldSpace = true;
+
+        CutSegment newSeg = new CutSegment
+        {
+            startIndex = startIndex,
+            timeElapsed = 0f,
+            lineRenderer = lr
+        };
+
+        cutSegments.Add(newSeg);
+    }
+
+    // 每帧更新所有切割段动画
+    private void UpdateCutSegments()
+    {
+        for (int i = cutSegments.Count - 1; i >= 0; i--)
+        {
+            var seg = cutSegments[i];
+            seg.timeElapsed += Time.deltaTime;
+
+            float expandT = Mathf.Clamp01(seg.timeElapsed / cutEdgeExpandDuration);
+            float coolT = Mathf.Clamp01((seg.timeElapsed - cutEdgeExpandDuration) / cutEdgeCoolDuration);
+
+            // 获取该段两个端点
+            int nextIndex = WrapIndex(seg.startIndex + 1);
+            Vector2 p1 = edgePoints[seg.startIndex];
+            Vector2 p2 = edgePoints[nextIndex];
+
+            Vector2 segmentDir = (p2 - p1).normalized;
+            Vector2 normal = new Vector2(-segmentDir.y, segmentDir.x);
+
+            float offset = cutEdgeMaxOffset * expandT;
+
+            // 四个点形成的卷边矩形
+            Vector3[] positions = new Vector3[4];
+            // 主边
+            positions[0] = p1;
+            positions[1] = p2;
+            // 卷边偏移边（沿法线方向偏移offset）
+            positions[2] = p2 + normal * offset;
+            positions[3] = p1 + normal * offset;
+
+            seg.lineRenderer.positionCount = 4;
+            seg.lineRenderer.SetPositions(positions);
+
+            // 颜色渐变
+            Color color = cutEdgeColorGradient.Evaluate(1f - coolT);
+            seg.lineRenderer.startColor = color;
+            seg.lineRenderer.endColor = color;
+
+            // 冷却结束删除该段
+            if (seg.timeElapsed > cutEdgeExpandDuration + cutEdgeCoolDuration)
+            {
+                Destroy(seg.lineRenderer.gameObject);
+                cutSegments.RemoveAt(i);
+            }
+        }
+    }
 
     private int FindNearestEdgePointIndex(Vector2 pos, out float minDist)
     {