c# 画流程图

在winform 中画流程图,用户拖动控件时，线条跟着变

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private Point pt;
        private List listLine;
        private List listPanel;
        public Form1（）
        {
            this.DoubleBuffered = true;
            this.Setstyle（Controlstyles.OptimizedDoubleBuffer |
  Controlstyles.ResizeRedraw |
  Controlstyles.AllPaintingInWmPaint true）;

            InitializeComponent（）;
        }

        private void Form1_Load（object sender EventArgs e）
        {
            //动态创建panel
            listPanel = new List（）;
            for （int i = 0; i < 6; i++）
            {
                Panel panel1 = new System.Windows.Forms.Panel（）;
                if（i%2==0）
                   panel1.BackgroundImage = global::WindowsFormsApplication1.Properties.Resources.icon_b_102;
                else
                   panel1.BackgroundImage = global::WindowsFormsApplication1.Properties.Resources.icon_b_18;
                
                panel1.Borderstyle = System.Windows.Forms.Borderstyle.FixedSingle;
                panel1.Location = new System.Drawing.Point（100 + 70 * i 100 + 70 * i）;
                panel1.Size = new System.Drawing.Size（60 60）;

                panel1.MouseDown += new System.Windows.Forms.MouseEventHandler（this.panel_MouseDown）;
                panel1.MouseEnter += new System.EventHandler（this.panel_MouseEnter）;
                panel1.MouseMove += new System.Windows.Forms.MouseEventHandler（this.panel_MouseMove）;

                gdraw.Controls.Add（panel1）;
                listPanel.Add（panel1）;
            }

            ////线条对象
            ////往里面添加就行了
            listLine = new List（）;
            for （int i = 0; i < 5; i++）
            {
                Line line = new Line（）;
                line.Start = listPanel[i];
                line.End = listPanel[i+1];

                Pen p = new Pen（Color.Blue 5）;//设置笔的粗细为颜色为蓝色
                //画箭头只对不封闭曲线有用
                p.Dashstyle = Dashstyle.Solid;//恢复实线
                p.EndCap = LineCap.ArrowAnchor;//定义线尾的样式为箭头
                line.Pen = p;
                listLine.Add（line）;
            }


        }
        
        private void panel_MouseDown（object sender MouseEventArgs e）
        {
            pt = Cursor.Position;
        }

        private void panel_MouseMove（object sender MouseEventArgs e）
        {
            gdraw.Update（）;
            gdraw.Refresh（）;
            Panel p = sender as Panel;
            if （e.Button == MouseButtons.Left）
            {
                int px = Cursor.Position.X - pt.X;
                int py = Cursor.Position.Y - pt.Y;
                p.Location = new Point（p.Location.X

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件      15872  2012-08-27 16:55  WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe

     文件      34304  2012-08-27 16:55  WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.pdb

     文件      14848  2012-08-27 16:55  WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe

     文件        490  2007-07-21 01:33  WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe.manifest

     文件       3913  2012-08-27 16:55  WindowsFormsApplication1\Form1.cs

     文件       2122  2012-08-27 16:49  WindowsFormsApplication1\Form1.Designer.cs

     文件       5817  2012-08-27 16:49  WindowsFormsApplication1\Form1.resx

     文件       6348  2012-08-27 16:52  WindowsFormsApplication1\Line.cs

     文件       6471  2012-08-27 15:10  WindowsFormsApplication1\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache

     文件       5120  2012-08-27 15:10  WindowsFormsApplication1\obj\x86\Debug\TempPE\Properties.Resources.Designer.cs.dll

     文件       1914  2012-08-27 16:55  WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.csproj.FileListAbsolute.txt

     文件        934  2012-08-27 16:52  WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.csproj.GenerateResource.Cache

     文件      15872  2012-08-27 16:55  WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.exe

     文件        180  2012-08-27 16:52  WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.Form1.resources

     文件      34304  2012-08-27 16:55  WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.pdb

     文件       2635  2012-08-27 16:52  WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.Properties.Resources.resources

     文件        505  2012-08-27 15:10  WindowsFormsApplication1\Program.cs

     文件       1398  2012-08-27 15:10  WindowsFormsApplication1\Properties\AssemblyInfo.cs

     文件       3402  2012-08-27 15:10  WindowsFormsApplication1\Properties\Resources.Designer.cs

     文件       6595  2012-08-27 15:10  WindowsFormsApplication1\Properties\Resources.resx

     文件       1109  2012-08-27 15:10  WindowsFormsApplication1\Properties\Settings.Designer.cs

     文件        249  2012-08-27 15:10  WindowsFormsApplication1\Properties\Settings.settings

     文件        676  2012-08-27 15:10  WindowsFormsApplication1\Resources\icon_b_102.png

     文件        700  2012-08-27 15:10  WindowsFormsApplication1\Resources\icon_b_15.png

     文件        770  2012-08-27 15:10  WindowsFormsApplication1\Resources\icon_b_18.png

    ..A.SH.      7168  2012-08-28 11:12  WindowsFormsApplication1\Resources\Thumbs.db

     文件       3961  2012-08-27 16:39  WindowsFormsApplication1\WindowsFormsApplication1.csproj

     文件        889  2012-08-27 16:52  WindowsFormsApplication1\WindowsFormsApplication1.sln

    ..A..H.     16384  2012-08-27 18:03  WindowsFormsApplication1\WindowsFormsApplication1.suo

     目录          0  2012-08-27 15:10  WindowsFormsApplication1\obj\x86\Debug\TempPE

............此处省略13个文件信息