测量工具标号：各类测量标签显示序号，删除后自动重编号

XP.ImageProcessing.RoiControl/Models/PointToLineGroup.cs

@@ -20,6 +20,7 @@ namespace XP.ImageProcessing.RoiControl.Models
         public Point L1 { get; set; }
         public Point L2 { get; set; }
         public Point P { get; set; }
+        public int Index { get; set; }
 
         public double Distance
         {
@@ -85,7 +86,7 @@ namespace XP.ImageProcessing.RoiControl.Models
             FootDot.Visibility = Visibility.Visible;
 
             // 标签
-            Label.Text = distanceText ?? $"{Distance:F2} px";
+            Label.Text = (Index > 0 ? $"#{Index} " : "") + (distanceText ?? $"{Distance:F2} px");
             Canvas.SetLeft(Label, (P.X + foot.X) / 2 + 8);
             Canvas.SetTop(Label, (P.Y + foot.Y) / 2 - 18);
             Label.Visibility = Visibility.Visible;