修改了很多

Workbench/Node/Junction/ConnectionLineShape.cs

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+using Serein.Library;
+using Serein.Workbench.Extension;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+using System.Windows.Shapes;
+
+namespace Serein.Workbench.Node.View
+{
+    /// <summary>
+    /// 连接线的类型
+    /// </summary>
+    public enum LineType
+    {
+        /// <summary>
+        /// 贝塞尔曲线
+        /// </summary>
+        Bezier,
+        /// <summary>
+        /// 半圆线
+        /// </summary>
+        Semicircle,
+    }
+
+    
+
+    /// <summary>
+    /// 贝塞尔曲线
+    /// </summary>
+    public class ConnectionLineShape : Shape
+    {
+        private readonly double strokeThickness;
+
+        private readonly LineType lineType;
+
+        /// <summary>
+        /// 确定起始坐标和目标坐标、外光样式的曲线
+        /// </summary>
+        /// <param name="lineType">线条类型</param>
+        /// <param name="start">起始坐标</param>
+        /// <param name="end">结束坐标</param>
+        /// <param name="brush">颜色</param>
+        /// <param name="isDotted">是否为虚线</param>
+        public ConnectionLineShape(LineType lineType,
+                                   Point start,
+                                   Point end,
+                                   Brush brush,
+                                   bool isDotted = false,
+                                   bool isTop = false)
+        {
+            this.lineType = lineType;
+            this.brush = brush;
+            startPoint = start;
+            endPoint = end;
+            this.strokeThickness = 4;
+            InitElementPoint(isDotted, isTop);
+            InvalidateVisual(); // 触发重绘
+        }
+        public void InitElementPoint(bool isDotted , bool isTop = false)
+        {
+            hitVisiblePen = new Pen(Brushes.Transparent, 1.0); // 初始化碰撞检测线
+            hitVisiblePen.Freeze(); // Freeze以提高性能
+            visualPen = new Pen(brush, 3.0); // 默认可视化Pen
+            if (isDotted)
+            {
+                visualPen.DashStyle = DashStyles.Dash; // 选择虚线样式
+            }
+            visualPen.Freeze(); // Freeze以提高性能
+
+            linkSize = 4;  // 整线条粗细
+            int zIndex = -999999;
+            if (isTop)
+            {
+                zIndex *= -1;
+            }
+            Panel.SetZIndex(this, zIndex); // 置底
+        }
+
+        /// <summary>
+        /// 更新线条落点位置
+        /// </summary>
+        /// <param name="start"></param>
+        /// <param name="end"></param>
+        public void UpdatePoints(Point start, Point end)
+        {
+            startPoint = start;
+            endPoint = end;
+            InvalidateVisual(); // 触发重绘
+        }
+
+        /// <summary>
+        /// 更新线条落点位置
+        /// </summary>
+        /// <param name="point"></param>
+        public void UpdateEndPoints(Point point)
+        {
+            endPoint = point;
+            InvalidateVisual(); // 触发重绘
+        }
+        /// <summary>
+        /// 更新线条落点位置
+        /// </summary>
+        /// <param name="point"></param>
+        public void UpdateStartPoints(Point point)
+        {
+            startPoint = point;
+            InvalidateVisual(); // 触发重绘
+        }
+        /// <summary>
+        /// 控件重绘事件
+        /// </summary>
+        /// <param name="drawingContext"></param>
+        protected override void OnRender(DrawingContext drawingContext)
+        {
+            // 刷新线条显示位置
+            switch (this.lineType)
+            {
+                case LineType.Bezier:
+                    DrawBezierCurve(drawingContext, startPoint, endPoint); 
+                    break;
+                case LineType.Semicircle:
+                    DrawSemicircleCurve(drawingContext, startPoint, endPoint);
+                    break;
+                default:
+                    break;
+            }
+
+        }
+        #region 重绘
+
+        private readonly StreamGeometry streamGeometry = new StreamGeometry();
+        private Point rightCenterOfStartLocation;  // 目标节点选择左侧边缘中心
+        private Point leftCenterOfEndLocation;  // 起始节点选择右侧边缘中心 
+        private Pen hitVisiblePen;  // 初始化碰撞检测线
+        private Pen visualPen; // 默认可视化Pen
+        private Point startPoint; // 连接线的起始节点
+        private Point endPoint; // 连接线的终点
+        private Brush brush; // 线条颜色
+        double linkSize;  // 根据缩放比例调整线条粗细
+        protected override Geometry DefiningGeometry => streamGeometry;
+        
+        public void UpdateLineColor(Brush brush)
+        {
+            visualPen = new Pen(brush, 3.0); // 默认可视化Pen
+            InvalidateVisual(); // 触发重绘
+        }
+
+
+        private Point c0, c1; // 用于计算贝塞尔曲线控制点逻辑
+        private Vector axis = new Vector(1, 0);
+        private Vector startToEnd;
+        private void DrawBezierCurve(DrawingContext drawingContext,
+                                   Point start,
+                                   Point end)
+        {
+            // 控制点的计算逻辑
+            double power = 140;  // 控制贝塞尔曲线的“拉伸”强度
+
+            // 计算轴向向量与起点到终点的向量
+            //var axis = new Vector(1, 0);
+            startToEnd = (end.ToVector() - start.ToVector()).NormalizeTo();
+
+            // 计算拉伸程度k，拉伸与水平夹角正相关
+            var k = 1 - Math.Pow(Math.Max(0, axis.DotProduct(startToEnd)), 10.0);
+
+            // 如果起点x大于终点x，增加额外的偏移量，避免重叠
+            var bias = start.X > end.X ? Math.Abs(start.X - end.X) * 0.25 : 0;
+
+            // 控制点的实际计算
+            c0 = new Point(+(power + bias) * k + start.X, start.Y);
+            c1 = new Point(-(power + bias) * k + end.X, end.Y);
+
+            // 准备StreamGeometry以用于绘制曲线
+            streamGeometry.Clear();
+            using (var context = streamGeometry.Open())
+            {
+                context.BeginFigure(start, true, false);   // 曲线起点
+                context.BezierTo(c0, c1, end, true, false); // 画贝塞尔曲线
+            }
+            drawingContext.DrawGeometry(null, visualPen, streamGeometry);
+        }
+        
+
+
+        private void DrawSemicircleCurve(DrawingContext drawingContext, Point start, Point end)
+        {
+            // 计算中心点和半径
+            // 计算圆心和半径
+            double x = 35;
+            // 创建一个弧线路径
+            streamGeometry.Clear();
+            using (var context = streamGeometry.Open())
+            {
+                // 开始绘制
+                context.BeginFigure(start, false, false);
+
+                // 生成弧线
+                context.ArcTo(
+                    end,               // 结束点
+                    new Size(x, x),   // 椭圆的半径
+                    0,                 // 椭圆的旋转角度
+                    false,            // 是否大弧
+                    SweepDirection.Counterclockwise, // 方向
+                    true,             // 是否连接到起始点
+                    true              // 是否使用高质量渲染
+                );
+
+                // 结束绘制
+                context.LineTo(start, false, false); // 连接到起始点（可选）
+            }
+
+            // 绘制弧线
+            drawingContext.DrawGeometry(null, visualPen, streamGeometry);
+
+        }
+        #endregion
+    }
+
+
+}