using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace WindowsApplication8
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 {
  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.Container components = null;

  public Form1()
  {
   //
   // Windows 窗体设计器支持所必需的
   //
   SetStyle(ControlStyles.ResizeRedraw | ControlStyles.Opaque, true);

   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
   //
  }

  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(292, 273);
   this.Name = "Form1";
   this.Text = "Form1";
   this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);

  }
  #endregion

  /// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }

  private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
  {
//   Graphics g = e.Graphics;
//　　  Pen p = new Pen(Color.Red);
//　　  int width = ClientRectangle.Width;
//　　  int height= ClientRectangle.Height;
//　　  g.DrawLine(p, 0,0, width, height);
//　　  g.DrawLine(p, 0, height, width, 0);
//　　  p.Dispose();
//     Graphics g = e.Graphics;
//　    Pen redPen = new Pen(Color.Red);
//　    //call our isolated drawing routing
//　    LineDrawRoutine(g, redPen);
//　    redPen.Dispose();
//　    g.Dispose();
   Graphics g = e.Graphics;
　   Pen bluePen = new Pen(Color.Blue);
　   Bitmap localBitmap = new Bitmap(ClientRectangle.Width,ClientRectangle.Height);
　   Graphics bitmapGraphics = Graphics.FromImage(localBitmap);
　   LineDrawRoutine(bitmapGraphics, bluePen);
//   bitmapGraphics.SmoothingMode = SmoothingMode.AntiAlias;
　   g.DrawImage(localBitmap, 0, 0);
　   bitmapGraphics.Dispose();

　   bluePen.Dispose();
　   localBitmap.Dispose();
　   g.Dispose();
  }
  private void LineDrawRoutine(Graphics g, Pen p)
  {
　   float width = ClientRectangle.Width;
　   float height = ClientRectangle.Height;
　   float xDelta = width / 20;
　   float yDelta = height / 20;

　   for (int i = 0; i < 20; i++)
   {
　　   g.DrawLine(p, 0, height - (yDelta * i), xDelta * i, 0);
　   }
  }
 }
}