添加项目文件。

VisionFrame/Nodes/StartNode.xaml.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+using VisionFrame.Base;
+using VisionFrame.Models;
+
+namespace VisionFrame.Nodes
+{
+    /// <summary>
+    /// StartNode.xaml 的交互逻辑
+    /// </summary>
+    public partial class StartNode : NodeBase
+    {
+        public StartNode()
+        {
+            InitializeComponent();
+        }
+
+        //public ICommand AnchorDownCommand { get; set; }
+        //public ICommand AnchorUpCommand { get; set; }
+
+        private void Ellipse_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
+        {
+            // T L R B
+            AnchorDownCommand?.Execute((this.DataContext as NodeModelBase).NodeId + ";B");
+            e.Handled = true;
+        }
+    }
+}