添加项目文件。

Util.DiagramDesigner/ViewModels/SimpleViewModel/PointDesignerItemViewModel.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Windows;
+
+namespace Util.DiagramDesigner
+{
+    public class PointDesignerItemViewModel : DesignerItemViewModelBase
+    {
+        private bool _showConnectors = false;
+        public new bool ShowConnectors
+        {
+            get
+            {
+                return _showConnectors;
+            }
+            set
+            {
+                SetProperty(ref _showConnectors, value);
+            }
+        }
+
+        public Point CurrentLocation
+        {
+            get
+            {
+                return new Point() { X = Left + ItemWidth / 2, Y = Top + ItemHeight / 2 };
+            }
+        }
+
+        public PointDesignerItemViewModel(Point location) : base()
+        {
+            Left = Math.Max(0, location.X - ItemWidth / 2);
+            Top = Math.Max(0, location.Y - ItemHeight / 2);
+        }
+
+        protected override void Init()
+        {
+            base.Init();
+
+            this.ClearConnectors();
+            this.AddConnector(new FullyCreatedConnectorInfo(this, ConnectorOrientation.None, true));
+
+            ItemWidth = 5;
+            ItemHeight = 5;
+        }
+
+      
+    }
+}