可以把连线从节点上拖下来，并且依附上去。

AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DiagramOption.cs

@@ -17,6 +17,11 @@ namespace AIStudio.Wpf.DiagramDesigner
         {
             get; set;
         } = new ShortcutOption();
+
+        public SnappingOption SnappingOption
+        {
+            get; set;
+        } = new SnappingOption();
     }
 
     public class LayoutOption
@@ -24,6 +29,22 @@ namespace AIStudio.Wpf.DiagramDesigner
     
     }
 
+    public class SnappingOption
+    {
+        public bool EnableSnapping
+        {
+            get; set;
+        }
+        public double SnappingRadius
+        {
+            get; set;
+        } = 50;
+        public double HittingRadius
+        {
+            get; set;
+        } = 20;
+    }
+
     public class ShortcutOption
     {
         [Description("Select All shortcut (CTRL+A by default)")]