自己修改的一个窗口特效类

 1 using System;
 2 using System.Drawing;
 3 using System.Drawing.Imaging; 
 4 using System.Runtime.InteropServices; 
 5 namespace myForm
 6 {
 7     /// <summary>
 8     /// Show 的摘要说明。
 9     /// </summary>
10     public class Show
11     {
12         System.Windows.Forms.Form this_form=null;
13         public Show(System.Windows.Forms.Form form)
14         {
15             //
16             // TODO: 在此处添加构造函数逻辑
17             //
18             this_form=form;
19             
20         }
21         [ DllImport("user32") ] 
22         public static extern System.IntPtr GetDC(System.IntPtr dc); 
23         System.Drawing.Graphics g; //画图板 
24 
25         Pen p=new Pen(Color.Blue,1); //画笔 
26 
27         int startx,starty,wx,wy,step; //startx,starty,wx,wy确定一个矩形 
28 
29         int cx,cy; //cx,cy为form的client的width 和height 
30         
31         public void DoShow()
32         {
33             this_form.Visible=false; 
34 
35             step=1; 
36 
37             g=Graphics.FromHdc(GetDC(System.IntPtr.Zero)); 
38 
39             cx=this_form.ClientSize.Width; 
40 
41             cy=this_form.ClientSize.Height; 
42 
43             this_form.Visible=false; 
44 
45             step=1; 
46 
47             while(step<=cx/2) 
48 
49             { 
50                 startx=cx/2-step; 
51 
52                 starty=cy*startx/cx; 
53 
54                 wx=2*step; 
55 
56                 wy=wx*cy/cx; 
57 
58                 startx+=this_form.Left; 
59 
60                 starty+=this_form.Top+this_form.Height-this_form.ClientSize.Height; 
61                 g.DrawRectangle(p,startx,starty,wx,wy); 
62 
63                 System.Threading.Thread.Sleep(100); 
64 
65                 step+=10; 
66             } 
67 
68             this_form.Visible=true; 
69         }
70     }
71 }
72