C#截取屏幕中選定區域的圖像

忘是亡心i 2022-08-25 13:44 133阅读 0赞

C\#截取屏幕中選定區域的圖像

原理:主窗體首先截取整個屏幕圖像作為主窗體的背景圖,並且最大化,然後再做一個可調整大小的半透明窗體,將該窗體顯示在主窗體上,那麼該窗體所在的方框就是所要截取的方框.調整該窗体也就可以調整截取的范圍.

1.主窗體的設計  
相關屬性:  
this.TopMost = true;  
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;

\--1.截取整個屏幕圖像

private  Bitmap GetScreenImage()  
\{  
Bitmap bmp  =  new  Bitmap(Screen.PrimaryScreen.Bounds.Width,  
Screen.PrimaryScreen.Bounds.Height);  
Graphics g  =  Graphics.FromImage(bmp);  
g.CopyFromScreen( 0 ,  0 ,  0 ,  0 , Screen.PrimaryScreen.Bounds.Size);  
g.Dispose();  
  
 return  bmp;  
\}

\--2.畫方框

private  void  FormBack\_MouseMove( object  sender, MouseEventArgs e)  
\{  
 if  ( ! this .catcher.Visible)  
\{  
 this .label\_CatcherLoc.Text  =  " 位置 X:  "  \+  e.X  \+  " , Y:  "  \+  e.Y;  
\}  
 if  ( this .isMouseLeftDown)  
\{  
Rectangle rect  =  new  Rectangle();  
rect.X  =  e.X  >  this .catcherLoc.X  ?  this .catcherLoc.X : e.X;  
rect.Y  =  e.Y  >  this .catcherLoc.Y  ?  this .catcherLoc.Y : e.Y;  
rect.Width  =  Math.Abs(e.X  \-  this .catcherLoc.X);  
rect.Height  =  Math.Abs(e.Y  \-  this .catcherLoc.Y);  
  
 this .catcher.Bounds  =  rect;  
 if  ( ! this .catcher.Visible)  
\{  
 this .catcher.Show( this );  
\}  
  
\}  
\}

\--3.取消繪製或退出:

private  void  FormBack\_MouseDown( object  sender, MouseEventArgs e)  
\{  
 if  (e.Button  ==  MouseButtons.Right)  
\{  
 if  ( ! this .catcher.Visible)  
\{  
Application.Exit();  
\}  
 else   
\{  
 this .catcher.Visible  =  false ;  
 this .catcherLoc  =  Point.Empty;  
 this .isMouseLeftDown  =  false ;  
\}  
\}  
 else  if  (e.Button  ==  MouseButtons.Left)  
\{  
 if  ( ! this .catcher.Visible)  
\{  
 this .catcherLoc  =  e.Location;  
 this .isMouseLeftDown  =  true ;  
\}  
\}  
\}

\--4.調整顯示面板  
如果改成(左上-->右上-->右下-->左下),代碼也不難,效果應該更好.

private  void  panel\_Info\_MouseEnter( object  sender, EventArgs e)  
\{  
Panel pl  =  (Panel)sender;  
 if  (pl.Right  <  this .Width  /  2 ) // 在左邊   
  \{  
pl.Location  =  new  Point( this .Width  \-  pl.Width  \-  20 , pl.Location.Y);  
\}  
 else   
\{  
pl.Location  =  new  Point( 10 ,  10 );  
\}  
\}

\--5.複製:  
還可以繼續添加一個右鍵菜單,擴展成更多的保存方式.

void  catcher\_DoubleClick( object  sender, EventArgs e)  
\{  
Bitmap bmpCatched  =  new  Bitmap( this .catcher.Width,  this .catcher.Height);  
Graphics g  =  Graphics.FromImage(bmpCatched);  
g.CopyFromScreen( this .catcher.Location,  new  Point( 0 ,  0 ),  this .catcher.ClientRectangle.Size);  
Clipboard.SetImage(bmpCatched);  
  
 if  (MessageBox.Show( " 已經復制導剪切板 " )  ==  DialogResult.OK)  
\{  
Application.Exit();  
\}  
\}

2.製作一個可調整大小的半透明的無標題欄窗體.  
在該窗體中應盡量實現應有的功能.

設置相關屬性:  
this.Cursor = System.Windows.Forms.Cursors.SizeAll;  
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;  
this.ShowInTaskbar = false;

\--1.繪製邊線及小方塊

// 繪制矩形邊框與8個小方塊   
  private  void  FormCatcher\_Paint( object  sender, PaintEventArgs e)  
\{  
 using  (Graphics g  =  e.Graphics)  
\{  
Rectangle rect  =  new  Rectangle( 2 ,  2 ,  this .ClientRectangle.Width \- 4 ,  this .ClientRectangle.Height \- 4 );  
g.DrawRectangle(Pens.Red, rect);  
  
 // 繪制小方塊,只要有邊線,不畫方塊,也可以調整大小   
  for  ( int  i  =  0 ; i  <=  7 ; i \++ )  
\{  
g.FillRectangle(Brushes.Red,  this .GetBoundsOfSmallBlock(i));  
\}  
\}  
\}

\--2.調整窗體大小及移動窗体

// 注意:調得太快時,鼠標好像跑得太快,有點不同步的感覺.   
  private  void  FormCatcher\_MouseMove( object  sender, MouseEventArgs e)  
\{  
  
 int  d  =  10 ;  
 if  (e.X  <  d) // 左邊緣   
  \{  
 if  (e.Y  <  d) // 左上   
  \{  
 this .Cursor  =  Cursors.SizeNWSE;  
 if  ( this .isMouseLeftDown)  
\{  
 this .Location  =  new  Point(Cursor.Position.X, Cursor.Position.Y);  
 this .Width  =  Math.Abs(Cursor.Position.X  \-  this .bottomLoc.X);  
 this .Height  =  Math.Abs(Cursor.Position.Y  \-  this .bottomLoc.Y);  
\}  
  
\}  
 else  if  (Math.Abs(e.Y  \-  this .Height)  <  d) // 左下   
  \{  
 this .Cursor  =  Cursors.SizeNESW;  
 if  ( this .isMouseLeftDown)  
\{  
 this .Location  =  new  Point(Cursor.Position.X, this .Location.Y);  
 this .Width  =  Math.Abs(Cursor.Position.X  \-  this .bottomLoc.X);  
 this .Height  =  Math.Abs(Cursor.Position.Y  \-  this .Location.Y);  
\}  
\}  
 else // 左   
  \{  
 this .Cursor  =  Cursors.SizeWE;  
 if  ( this .isMouseLeftDown)  
\{  
 this .Location  =  new  Point(Cursor.Position.X,  this .Location.Y);  
 this .Width  =  Math.Abs(Cursor.Position.X  \-  this .bottomLoc.X);  
\}  
  
  
\}  
\}  
 else  if  (Math.Abs(e.X  \-  this .Width)  <  d) // 右邊緣   
  \{  
  
 if  (e.Y  <  d) // 右上   
  \{  
 this .Cursor  =  Cursors.SizeNESW;  
 if  ( this .isMouseLeftDown)  
\{  
 this .Location  =  new  Point( this .Location.X, Cursor.Position.Y);  
 this .Width  =  Math.Abs(Cursor.Position.X  \-  this .Location.X);  
 this .Height  =  Math.Abs(Cursor.Position.Y  \-  this .bottomLoc.Y);  
  
\}  
\}  
 else  if  (Math.Abs(e.Y  \-  this .Height)  <  d) // 右下   
  \{  
 this .Cursor  =  Cursors.SizeNWSE;  
 if  ( this .isMouseLeftDown)  
\{  
 this .Height  =  Cursor.Position.Y  \-  this .Location.Y;  
 this .Width  =  Cursor.Position.X  \-  this .Location.X;  
\}  
\}  
 else // 右   
  \{  
 this .Cursor  =  Cursors.SizeWE;  
 if  ( this .isMouseLeftDown)  
\{  
 this .Width  =  Cursor.Position.X  \-  this .Location.X;  
\}  
\}  
\}  
 else   
\{  
 if  (e.Y  <  d) // 上邊緣   
  \{  
 this .Cursor  =  Cursors.SizeNS; // 中上   
  if  ( this .isMouseLeftDown)  
\{  
 this .Location  =  new  Point( this .Location.X,Cursor.Position.Y);  
 this .Height  =  Math.Abs(Cursor.Position.Y  \-  this .bottomLoc.Y);  
\}  
\}  
 else  if  (Math.Abs(e.Y  \-  this .Height)  <  d) // 下邊緣   
  \{  
 this .Cursor  =  Cursors.SizeNS; // 中下   
  if  ( this .isMouseLeftDown)  
\{  
 this .Height  =  Cursor.Position.Y  \-  this .Location.Y;  
\}  
\}  
 else // 非邊緣區域   
  \{  
 this .Cursor  =  Cursors.SizeAll;  
  
 if  ( this .isMouseLeftDown)  
\{  // 按下鼠標左鍵並拖動窗口,改變窗口位置   
  this .Location  =  new  Point(Cursor.Position.X  \-  this .dxCursorToWindow,  
Cursor.Position.Y  \-  this .dyCursorToWindow);  
\}  
\}  
\}  
  
\}

3.附源碼  
源碼1:

using  System;  
 using  System.Collections.Generic;  
 using  System.ComponentModel;  
 using  System.Data;  
 using  System.Drawing;  
 using  System.Drawing.Drawing2D;  
 using  System.Text;  
 using  System.Windows.Forms;  
  
 namespace  QQCatchScreen  
\{  
 public  partial  class  FormCatcher : Form  
\{  
 public  FormCatcher()  
\{  
InitializeComponent();  
 this .Paint  \+=  new  System.Windows.Forms.PaintEventHandler( this .FormCatcher\_Paint);  
 this .Resize  \+=  new  EventHandler(FormCatcher\_Resize);  
 this .MouseUp  \+=  new  System.Windows.Forms.MouseEventHandler( this .FormCatcher\_MouseUp);  
 this .MouseDown  \+=  new  System.Windows.Forms.MouseEventHandler( this .FormCatcher\_MouseDown);  
 this .MouseMove  \+=  new  System.Windows.Forms.MouseEventHandler( this .FormCatcher\_MouseMove);  
  
\}  
  
 private  bool  isMouseLeftDown  =  false ;  
 ///  <summary>   
 ///  鼠標按下時鼠標與窗體位置橫坐標差  
 ///  </summary>   
  private  int  dxCursorToWindow  =  0 ;  
 ///  <summary>   
 ///  鼠標按下時鼠標與窗體位置縱坐標差  
 ///  </summary>   
  private  int  dyCursorToWindow  =  0 ;  
 ///  <summary>   
 ///  窗體右下角的座標  
 ///  </summary>   
  private  Point bottomLoc  =  Point.Empty;  
  
 void  FormCatcher\_Resize( object  sender, EventArgs e)  
\{  
 this .Refresh();  
\}  
  
 // 繪制矩形邊框與8個小方塊   
  private  void  FormCatcher\_Paint( object  sender, PaintEventArgs e)  
\{  
 using  (Graphics g  =  e.Graphics)  
\{  
Rectangle rect  =  new  Rectangle( 2 ,  2 ,  this .ClientRectangle.Width \- 4 ,  this .ClientRectangle.Height \- 4 );  
g.DrawRectangle(Pens.Red, rect);  
  
 // 繪制小方塊,只要有邊線,不畫方塊,也可以調整大小   
  for  ( int  i  =  0 ; i  <=  7 ; i \++ )  
\{  
g.FillRectangle(Brushes.Red,  this .GetBoundsOfSmallBlock(i));  
\}  
\}  
\}  
  
 ///  <summary>   
 ///  獲取指定序號的小方塊的位置  
 ///  </summary>   
 ///  <param name="index"></param>   
 ///  <returns></returns>   
  private  Rectangle GetBoundsOfSmallBlock( int  index)  
\{  
 int  x  =  0 ;  
 int  y  =  0 ;  
 int  w  =  4 ;  
 int  h  =  4 ;  
  
 switch  (index)  
\{  
 case  0 :  
 case  3 :  
 case  5 :  
x  =  0 ;  
 break ;  
 case  1 :  
 case  6 :  
x  =  this .ClientRectangle.Width  /  2  \- 3 ; //  
  break ;  
 case  2 :  
 case  4 :  
 case  7 :  
x  =  this .ClientRectangle.Width \- 4 ; //  
  break ;  
 default :  
 throw  new  IndexOutOfRangeException( " 小方塊序號錯誤，應該在?0，? " );  
\}  
  
 switch  (index)  
\{  
 case  0 :  
 case  1 :  
 case  2 :  
y  =  0 ;  
 break ;  
 case  3 :  
 case  4 :  
y  =  this .ClientRectangle.Height  /  2  \- 3 ; //  
  break ;  
 case  5 :  
 case  6 :  
 case  7 :  
y  =  this .ClientRectangle.Height \- 4 ; //  
  break ;  
 default :  
 throw  new  IndexOutOfRangeException( " 小方塊序號錯誤，應該在?0，? " );  
\}  
  
 return  new  Rectangle(x, y, w, h);  
\}  
  
 private  void  FormCatcher\_MouseDown( object  sender, MouseEventArgs e)  
\{  
 if  (e.Button  ==  MouseButtons.Left)  
\{  
 this .isMouseLeftDown  =  true ;  
 this .dxCursorToWindow  =  Cursor.Position.X  \-  this .Location.X;  
 this .dyCursorToWindow  =  Cursor.Position.Y  \-  this .Location.Y;  
 this .bottomLoc  =  new  Point( this .Location.X  \+  this .Width,  this .Location.Y  \+  this .Height);  
\}  
\}  
  
 private  void  FormCatcher\_MouseUp( object  sender, MouseEventArgs e)  
\{  
 if  (e.Button  ==  MouseButtons.Left)  
\{  
 this .isMouseLeftDown  =  false ;  
 this .dxCursorToWindow  =  this .dyCursorToWindow  =  0 ;  
 this .bottomLoc  =  new  Point( this .Location.X  \+  this .Width,  this .Location.Y  \+  this .Height);  
\}  
\}  
  
 // 調整大小就在這裡實現  
 // Bug:調得太快時,效果不好.   
  private  void  FormCatcher\_MouseMove( object  sender, MouseEventArgs e)  
\{  
  
 int  d  =  10 ;  
 if  (e.X  <  d) // 左邊緣   
  \{  
 if  (e.Y  <  d) // 左上   
  \{  
 this .Cursor  =  Cursors.SizeNWSE;  
 if  ( this .isMouseLeftDown)  
\{  
 this .Location  =  new  Point(Cursor.Position.X, Cursor.Position.Y);  
 this .Width  =  Math.Abs(Cursor.Position.X  \-  this .bottomLoc.X);  
 this .Height  =  Math.Abs(Cursor.Position.Y  \-  this .bottomLoc.Y);  
\}  
  
\}  
 else  if  (Math.Abs(e.Y  \-  this .Height)  <  d) // 左下   
  \{  
 this .Cursor  =  Cursors.SizeNESW;  
 if  ( this .isMouseLeftDown)  
\{  
 this .Location  =  new  Point(Cursor.Position.X, this .Location.Y);  
 this .Width  =  Math.Abs(Cursor.Position.X  \-  this .bottomLoc.X);  
 this .Height  =  Math.Abs(Cursor.Position.Y  \-  this .Location.Y);  
\}  
\}  
 else // 左   
  \{  
 this .Cursor  =  Cursors.SizeWE;  
 if  ( this .isMouseLeftDown)  
\{  
 this .Location  =  new  Point(Cursor.Position.X,  this .Location.Y);  
 this .Width  =  Math.Abs(Cursor.Position.X  \-  this .bottomLoc.X);  
\}  
  
  
\}  
\}  
 else  if  (Math.Abs(e.X  \-  this .Width)  <  d) // 右邊緣   
  \{  
  
 if  (e.Y  <  d) // 右上   
  \{  
 this .Cursor  =  Cursors.SizeNESW;  
 if  ( this .isMouseLeftDown)  
\{  
 this .Location  =  new  Point( this .Location.X, Cursor.Position.Y);  
 this .Width  =  Math.Abs(Cursor.Position.X  \-  this .Location.X);  
 this .Height  =  Math.Abs(Cursor.Position.Y  \-  this .bottomLoc.Y);  
  
\}  
\}  
 else  if  (Math.Abs(e.Y  \-  this .Height)  <  d) // 右下   
  \{  
 this .Cursor  =  Cursors.SizeNWSE;  
 if  ( this .isMouseLeftDown)  
\{  
 this .Height  =  Cursor.Position.Y  \-  this .Location.Y;  
 this .Width  =  Cursor.Position.X  \-  this .Location.X;  
\}  
\}  
 else // 右   
  \{  
 this .Cursor  =  Cursors.SizeWE;  
 if  ( this .isMouseLeftDown)  
\{  
 this .Width  =  Cursor.Position.X  \-  this .Location.X;  
\}  
\}  
\}  
 else   
\{  
 if  (e.Y  <  d) // 上邊緣   
  \{  
 this .Cursor  =  Cursors.SizeNS; // 中上   
  if  ( this .isMouseLeftDown)  
\{  
 this .Location  =  new  Point( this .Location.X,Cursor.Position.Y);  
 this .Height  =  Math.Abs(Cursor.Position.Y  \-  this .bottomLoc.Y);  
\}  
\}  
 else  if  (Math.Abs(e.Y  \-  this .Height)  <  d) // 下邊緣   
  \{  
 this .Cursor  =  Cursors.SizeNS; // 中下   
  if  ( this .isMouseLeftDown)  
\{  
 this .Height  =  Cursor.Position.Y  \-  this .Location.Y;  
\}  
\}  
 else // 非邊緣區域   
  \{  
 this .Cursor  =  Cursors.SizeAll;  
  
 if  ( this .isMouseLeftDown)  
\{  // 按下鼠標左鍵並拖動窗口,改變窗口位置   
  this .Location  =  new  Point(Cursor.Position.X  \-  this .dxCursorToWindow,  
Cursor.Position.Y  \-  this .dyCursorToWindow);  
\}  
\}  
\}  
  
\}  
  
\}  
\}

源碼2:

using  System;  
 using  System.Collections.Generic;  
 using  System.ComponentModel;  
 using  System.Data;  
 using  System.Drawing;  
 using  System.Drawing.Drawing2D;  
 using  System.Text;  
 using  System.Windows.Forms;  
  
 namespace  QQCatchScreen  
\{  
 public  partial  class  FormBack : Form  
\{  
 ///  <summary>   
 ///  保存整個屏幕的圖像  
 ///  </summary>   
  private  Bitmap screenImage  =  null ;  
  
 ///  <summary>   
 ///  用於確定最終捕獲圖像的窗口  
 ///  </summary>   
  private  FormCatcher catcher  =  new  FormCatcher();  
  
 ///  <summary>   
 ///  用於記錄catcher的位置  
 ///  </summary>   
  private  Point catcherLoc  =  Point.Empty;  
  
 ///  <summary>   
 ///  標記鼠標左鍵是否按下  
 ///  </summary>   
  private  bool  isMouseLeftDown  =  false ;  
  
  
 public  FormBack()  
\{  
InitializeComponent();  
 this .MouseUp  \+=  new  System.Windows.Forms.MouseEventHandler( this .FormBack\_MouseUp);  
 this .MouseMove  \+=  new  System.Windows.Forms.MouseEventHandler( this .FormBack\_MouseMove);  
 this .MouseDown  \+=  new  System.Windows.Forms.MouseEventHandler( this .FormBack\_MouseDown);  
 this .Load  \+=  new  System.EventHandler( this .FormBack\_Load);  
\}  
  
 private  void  FormBack\_Load( object  sender, EventArgs e)  
\{  
 this .Cursor  =  new  Cursor( " cur.cur " );  
 // 設置位置和背景   
  this .Bounds  =  Screen.PrimaryScreen.Bounds;  
 this .screenImage  =  this .GetScreenImage();  
 this .BackgroundImage  =  this .screenImage;  
  
 // 加載捕獲窗口   
  this .catcher.Opacity  =  0.4 ;  
 this .catcher.Visible  =  false ;  
 this .catcher.MouseDown  \+=  new  MouseEventHandler(catcher\_MouseDown);  
 this .catcher.DoubleClick  \+=  new  EventHandler(catcher\_DoubleClick);  
 this .catcher.SizeChanged  \+=  new  EventHandler(catcher\_SizeChanged);  
 this .catcher.VisibleChanged  \+=  new  EventHandler(catcher\_VisibleChanged);  
 this .catcher.LocationChanged  \+=  new  EventHandler(catcher\_LocationChanged);  
  
\}  
  
 void  catcher\_VisibleChanged( object  sender, EventArgs e)  
\{  
 if  ( ! this .catcher.Visible)  
\{  
 this .label\_CatcherWidth.Text  =  " 寬度 ?0 " ;  
 this .label\_CatcherHeight.Text  =  " 高度 ?0  " ;  
\}  
\}  
  
  
 void  catcher\_LocationChanged( object  sender, EventArgs e)  
\{  
 this .label\_CatcherLoc.Text  =  " 位置 X:  "  \+  this .catcher.Location.X  \+  " , Y:  "  \+  this .catcher.Location.Y;  
\}  
  
 void  catcher\_SizeChanged( object  sender, EventArgs e)  
\{  
 this .label\_CatcherWidth.Text  =  " 寬度  "  \+  this .catcher.Width;  
 this .label\_CatcherHeight.Text  =  " 高度  "  \+  this .catcher.Height;  
\}  
  
 void  catcher\_MouseDown( object  sender, MouseEventArgs e)  
\{  
 if  (e.Button  ==  MouseButtons.Right)  
\{  
 this .catcherLoc  =  Point.Empty;  
 this .isMouseLeftDown  =  false ;  
 this .catcher.Visible  =  false ;  
\}  
  
\}  
  
 void  catcher\_DoubleClick( object  sender, EventArgs e)  
\{  
Bitmap bmpCatched  =  new  Bitmap( this .catcher.Width,  this .catcher.Height);  
Graphics g  =  Graphics.FromImage(bmpCatched);  
g.CopyFromScreen( this .catcher.Location,  new  Point( 0 ,  0 ),  this .catcher.ClientRectangle.Size);  
Clipboard.SetImage(bmpCatched);  
  
 if  (MessageBox.Show( " 已經復制導剪切板 " )  ==  DialogResult.OK)  
\{  
Application.Exit();  
\}  
\}  
  
  
 ///  <summary>   
 ///  獲取屏幕圖像  
 ///  </summary>   
  private  Bitmap GetScreenImage()  
\{  
Bitmap bmp  =  new  Bitmap(Screen.PrimaryScreen.Bounds.Width,  
Screen.PrimaryScreen.Bounds.Height);  
Graphics g  =  Graphics.FromImage(bmp);  
g.CopyFromScreen( 0 ,  0 ,  0 ,  0 , Screen.PrimaryScreen.Bounds.Size);  
g.Dispose();  
  
 return  bmp;  
\}  
 private  void  FormBack\_MouseUp( object  sender, MouseEventArgs e)  
\{  
 if  (e.Button  ==  MouseButtons.Left)  
\{  
 this .catcherLoc  =  Point.Empty;  
 this .isMouseLeftDown  =  false ;  
\}  
\}  
  
 private  void  FormBack\_MouseDown( object  sender, MouseEventArgs e)  
\{  
 if  (e.Button  ==  MouseButtons.Right)  
\{  
 if  ( ! this .catcher.Visible)  
\{  
Application.Exit();  
\}  
 else   
\{  
 this .catcher.Visible  =  false ;  
 this .catcherLoc  =  Point.Empty;  
 this .isMouseLeftDown  =  false ;  
\}  
\}  
 else  if  (e.Button  ==  MouseButtons.Left)  
\{  
 if  ( ! this .catcher.Visible)  
\{  
 this .catcherLoc  =  e.Location;  
 this .isMouseLeftDown  =  true ;  
\}  
\}  
\}  
  
 private  void  FormBack\_MouseMove( object  sender, MouseEventArgs e)  
\{  
 if  ( ! this .catcher.Visible)  
\{  
 this .label\_CatcherLoc.Text  =  " 位置 X:  "  \+  e.X  \+  " , Y:  "  \+  e.Y;  
\}  
 if  ( this .isMouseLeftDown)  
\{  
Rectangle rect  =  new  Rectangle();  
rect.X  =  e.X  >  this .catcherLoc.X  ?  this .catcherLoc.X : e.X;  
rect.Y  =  e.Y  >  this .catcherLoc.Y  ?  this .catcherLoc.Y : e.Y;  
rect.Width  =  Math.Abs(e.X  \-  this .catcherLoc.X);  
rect.Height  =  Math.Abs(e.Y  \-  this .catcherLoc.Y);  
  
 this .catcher.Bounds  =  rect;  
 if  ( ! this .catcher.Visible)  
\{  
 this .catcher.Show( this );  
\}  
  
\}  
\}  
  
 private  void  panel\_Info\_MouseEnter( object  sender, EventArgs e)  
\{  
Panel pl  =  (Panel)sender;  
 if  (pl.Right  <  this .Width  /  2 ) // 在左邊   
  \{  
pl.Location  =  new  Point( this .Width  \-  pl.Width  \-  20 , pl.Location.Y);  
\}  
 else   
\{  
pl.Location  =  new  Point( 10 ,  10 );  
\}  
\}  
  
  
\}  
  
  
\}