C # winfrom Magnifier feature

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.ComponentModel;4 usingSystem.Data;5 usingSystem.Drawing;6 usingSystem.Linq;7 usingSystem.Text;8 usingSystem.Windows.Forms;9 usingSystem.Threading;Ten  One namespaceTest A { -      Public Partial classForm2:form -     { the         Private BOOLBlisdrawrectangle =true; -         PrivatePoint Ptbegin =NewPoint (); - Thread Thdraw; -         Delegate voidMydrawrectangel (); + Mydrawrectangel Mydraw; -          PublicForm2 () +         { A InitializeComponent (); at         } -  -         Private voidPicturebox1_paint (Objectsender, PaintEventArgs e) -         { -             if(Blisdrawrectangle) -             { inE.graphics.drawrectangle (NewPen (Brushes.black,1), ptbegin.x, PTBEGIN.Y, -, -); -             } to         } +  -         Private voidForm2_load (Objectsender, EventArgs e) the         { *Mydraw =NewMydrawrectangel (showdrawrectangle); $Thdraw =NewThread (Run);Panax Notoginseng Thdraw.start (); -         } the         Private voidRun () +         { A              while(true) the             { +                 if(pictureBox1.Image! =NULL) -                 { $                      This. BeginInvoke (Mydraw); $                 } -Thread.Sleep ( -); -             } the         } -         Private voidShowdrawrectangle ()Wuyi         { theRectangle rec =NewRectangle (ptbegin.x * pictureBox1.Image.Size.Width/460, -PTBEGIN.Y * PictureBox1.Image.Size.Height/ -, -* PictureBox1.Image.Size.Width/460, Wu                  -* PictureBox1.Image.Size.Height/ -); -Graphics g =picturebox2.creategraphics (); About g.drawimage (pictureBox1.Image, Picturebox2.clientrectangle, REC, graphicsunit.pixel); $ G.flush (); -         } -  -         Private voidPicturebox1_mouseleave (Objectsender, EventArgs e) A         { +Blisdrawrectangle =false; the Picturebox1.refresh (); -         } $  the         Private voidPicturebox1_mouseenter (Objectsender, EventArgs e) the         { theBlisdrawrectangle =true; the         } -  in         Private voidPicturebox1_mousemove (Objectsender, MouseEventArgs e) the         { the             if(E.x- -<=0) About             { thePtbegin.x =0; the             } the             Else if(Picturebox1.size.width-e.x <= -) +             { -ptbegin.x = PictureBox1.Size.Width- -; the             }Bayi             Else the             { theptbegin.x = e.x- -; -             } -  the             if(E.y- -<=0) the             { thePTBEGIN.Y =0; the             } -             Else if(picturebox1.size.height-e.y<= -) the             { thePTBEGIN.Y = PictureBox1.Size.Height- -; the             }94             Else the             { thePTBEGIN.Y = e.y- -; the             }98 Picturebox1.refresh (); About         } -     }101}

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C # winfrom Magnifier feature