using System;

 using System.Collections.Generic;

 using System.ComponentModel;

 using System.Drawing;

 using System.Data;

 using System.Linq;

 using System.Text;

 using System.Windows.Forms;

 using System.Drawing.Drawing2D;

 namespace ShadowPanel3

 {

     public partial class UserPanel : Panel

     {

         public UserPanel()

         {

         }

             /// <summary>

         /// 字段和属性 ， panel的颜色

         /// </summary>

         private Color _panelColor;

         public Color PanelColor

         {

             get { return _panelColor; }

             set { this._panelColor = value; }

         }

         /// <summary>

         /// 字段和属性，border的颜色

         /// </summary>

         private Color _borderColor;

         public Color BorderColor

         {

             get { return _borderColor; }

             set { this._borderColor = value; }

         }

         /// <summary>

         /// 阴影区域大小

         /// </summary>

         private int shadowSize = ;

         //将预备的小图标转化

         static Image shadowDownRight = new Bitmap(typeof(UserPanel), "Images.tshadowdownright.png");

         static Image shadowDown = new Bitmap(typeof(UserPanel), "Images.tshadowdown.png");

         static Image shadowRight = new Bitmap(typeof(UserPanel), "Images.tshadowright.png");

         static Image shadowTop = new Bitmap(typeof(UserPanel),"Images.tshadowtop.png");

         static Image shadowLeft = new Bitmap(typeof(UserPanel),"Images.tshadowleft.png");

         static Image shadowLeftDown = new Bitmap(typeof(UserPanel),"Images.tshadowleftdown.png");

         static Image shadowLeftTop = new Bitmap(typeof(UserPanel),"Images.tshadowlefttop.png");

         static Image shadowTopLeft = new Bitmap(typeof(UserPanel),"Images.tshadowtopleft.png");

         /// <summary>

         /// 重绘panel

         /// </summary>

         /// <param name="e"></param>

         protected override void OnPaint(PaintEventArgs e)

         {

             base.OnPaint(e);

             //Get the graphics object. We need something to draw with

             Graphics g = e.Graphics;

             //下边和右边画笔

             TextureBrush shadowRightBrush = new TextureBrush(shadowRight,WrapMode.Tile);

             TextureBrush shadowDownBrush = new TextureBrush(shadowDown,WrapMode.Tile);

             //上边和左边画笔

             TextureBrush shadowLeftBrush = new TextureBrush(shadowLeft, WrapMode.Tile);

             TextureBrush shadowTopBrush = new TextureBrush(shadowTop,WrapMode.Tile);

             //给画笔定位

             shadowDownBrush.TranslateTransform(, Height - shadowSize);

             shadowRightBrush.TranslateTransform(Width - shadowSize, );

             shadowTopBrush.TranslateTransform(,);

             shadowLeftBrush.TranslateTransform(,);

             //每个阴影区域非配一个矩形区域

             Rectangle shadowDownRectangle = new Rectangle(

                 shadowSize,                                                     //X

                 Height-shadowSize,                                         //Y

                 Width-shadowSize*,                                     //width(stretches)

                 shadowSize                                                    //height

                 );

             Rectangle shadowRightRectangle = new Rectangle(

               Width-shadowSize,                                           //X

               shadowSize,                                                     //Y

               shadowSize,                                                    //width

               Height-shadowSize*                                       //height(stretches)

               );

             Rectangle shadowTopRectangle = new Rectangle(

               shadowSize,                                                    //X

               ,                                                                     //Y

               Width-shadowSize*,                                       //width

               shadowSize                                                     //height(stretches)

               );

             Rectangle shadowLeftRectangle = new Rectangle(

               ,                                                                    //X

               shadowSize,                                                    //Y

               shadowSize,                                                    //width

               Height-shadowSize*                                       //height(stretches)

               );

             //在底部和右边画出阴影

             g.FillRectangle(shadowDownBrush,shadowDownRectangle);

             g.FillRectangle(shadowRightBrush,shadowRightRectangle);

             //在上部和左边画出阴影

             g.FillRectangle(shadowTopBrush,shadowTopRectangle);

             g.FillRectangle(shadowLeftBrush,shadowLeftRectangle);

             //四个角落处的阴影

             g.DrawImage(shadowDownRight, new Rectangle(Width-shadowSize, Height-shadowSize,shadowSize,shadowSize));

             g.DrawImage(shadowLeftDown, new Rectangle(, Height - shadowSize, shadowSize, shadowSize));

             g.DrawImage(shadowLeftTop, new Rectangle(, , shadowSize, shadowSize));

             g.DrawImage(shadowTopLeft, new Rectangle(Width-shadowSize, , shadowSize, shadowSize));

             Rectangle fullRectangle = new Rectangle(

                 ,

                 ,

                 Width - (shadowSize + ),

                 Height - (shadowSize + )

                 );

             if (PanelColor != null)

             {

                 SolidBrush bgBrush = new SolidBrush(_panelColor);

                 g.FillRectangle(bgBrush,fullRectangle);

             }

             //给panel添加边框颜色

             if (_borderColor != null)

             {

                 Pen borderPen = new Pen(BorderColor);

                 g.DrawRectangle(borderPen,fullRectangle);

             }

             //释放画笔资源

             shadowDownBrush.Dispose();

             shadowRightBrush.Dispose();

             shadowLeftBrush.Dispose();

             shadowTopBrush.Dispose();

             shadowDownBrush = null;

             shadowRightBrush = null;

             shadowTopBrush = null;

             shadowLeftBrush = null;

         }

             //Correct resizing

             protected override void OnResize(EventArgs e)

             {

                 base.Invalidate();

                 base.OnResize(e);

             }

     }

 }