可以把连线从节点上拖下来，并且依附上去。

AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/Connector/ConnectorPointModel.cs

@@ -144,29 +144,48 @@ namespace AIStudio.Wpf.DiagramDesigner
         }
         public virtual PointBase MiddlePosition => new PointBase(X, Y);
 
-        private double connectorWidth = 8;
+        private double _connectorWidth = 8;
         public double ConnectorWidth
         {
             get
             {
-                return connectorWidth;
+                return _connectorWidth;
             }
             set
             {
-                connectorWidth = value;
+                _connectorWidth = value;
             }
         }
 
-        private double connectorHeight = 8;
+        private double _connectorHeight = 8;
         public double ConnectorHeight
         {
             get
             {
-                return connectorHeight;
+                return _connectorHeight;
             }
             set
             {
-                connectorHeight = value;
+                _connectorHeight = value;
+            }
+        }
+
+        public void SetPosition(PointBase position)
+        {
+            X = position.X;
+            Y = position.Y;
+        }
+
+        private bool _dragStart;
+        public bool DragStart
+        {
+            get
+            {
+                return _dragStart;
+            }
+            set
+            {
+                SetProperty(ref _dragStart, value);
             }
         }