点点距测量工具：端点由点改为线段

XP.ImageProcessing.RoiControl/Models/MeasureGroup.cs

@@ -9,12 +9,21 @@ namespace XP.ImageProcessing.RoiControl.Models
     /// <summary>一次点点距测量的所有视觉元素</summary>
     public class MeasureGroup
     {
+        // 保留原有圆点属性以兼容其他代码
         public Ellipse Dot1 { get; set; }
         public Ellipse Dot2 { get; set; }
+        
+        // 新增：垂直线段（替代圆点的视觉表现）
+        public Line PerpLine1 { get; set; }
+        public Line PerpLine2 { get; set; }
+        
         public Line Line { get; set; }
         public TextBlock Label { get; set; }
         public Point P1 { get; set; }
         public Point P2 { get; set; }
+        
+        /// <summary>垂直线段长度（像素）</summary>
+        public double PerpLineLength { get; set; } = 10.0;
 
         public double Distance
         {
@@ -30,6 +39,46 @@ namespace XP.ImageProcessing.RoiControl.Models
             Line.X1 = P1.X; Line.Y1 = P1.Y;
             Line.X2 = P2.X; Line.Y2 = P2.Y;
             Line.Visibility = Visibility.Visible;
+            
+            // 更新垂直线段位置
+            UpdatePerpLines();
+        }
+
+        /// <summary>更新两条垂直线段的位置</summary>
+        public void UpdatePerpLines()
+        {
+            if (PerpLine1 == null || PerpLine2 == null) return;
+            
+            // 计算两点连线的方向向量
+            double dx = P2.X - P1.X;
+            double dy = P2.Y - P1.Y;
+            double len = Math.Sqrt(dx * dx + dy * dy);
+            
+            if (len < 0.001) return; // 避免除零
+            
+            // 归一化方向向量
+            double ux = dx / len;
+            double uy = dy / len;
+            
+            // 垂直方向向量 (-uy, ux)
+            double vx = -uy;
+            double vy = ux;
+            
+            // P1处的垂直线段
+            double halfLen1 = PerpLineLength / 2;
+            PerpLine1.X1 = P1.X + vx * halfLen1;
+            PerpLine1.Y1 = P1.Y + vy * halfLen1;
+            PerpLine1.X2 = P1.X - vx * halfLen1;
+            PerpLine1.Y2 = P1.Y - vy * halfLen1;
+            PerpLine1.Visibility = Visibility.Visible;
+            
+            // P2处的垂直线段
+            double halfLen2 = PerpLineLength / 2;
+            PerpLine2.X1 = P2.X + vx * halfLen2;
+            PerpLine2.Y1 = P2.Y + vy * halfLen2;
+            PerpLine2.X2 = P2.X - vx * halfLen2;
+            PerpLine2.Y2 = P2.Y - vy * halfLen2;
+            PerpLine2.Visibility = Visibility.Visible;
         }
 
         public void UpdateLabel(string distanceText = null)