資源簡介
C#寫的放大鏡程序,模擬真實放大鏡的效果,能放大鼠標位置的區(qū)域并直接顯示在鼠標的位置,不偏移顯示,效果跟真實放大鏡一樣,鼠標滾輪可調節(jié)放大倍率,ESC鍵退出.只是代碼雛形,沒有完全完成,卡在實時更新的問題,希望網友們集思廣益,一起實現(xiàn).
代碼片段和文件信息
using?System;
using?System.Collections.Generic;
using?System.ComponentModel;
using?System.Data;
using?System.Drawing;
using?System.Text;
using?System.Windows.Forms;
using?System.Runtime.InteropServices;
namespace?WindowsFormsApplication1
{
public?partial?class?Form1?:?Form
{
const?float?zommDelta?=?0.2f;
private?float?zoom?=?2;
private?float?lastZoom?=?2;
private?Point?offset?=?new?Point（0?0）;
private?Point?lastMousePosition?=?new?Point（0?0）;
private?Bitmap?tempMap;
public?Form1（）
{
InitializeComponent（）;
Setstyle（Controlstyles.UserPaint?true）;
Setstyle（Controlstyles.DoubleBuffer?true）;
Setstyle（Controlstyles.AllPaintingInWmPaint?true）;
Setstyle（Controlstyles.ResizeRedraw?true）;
this.MouseWheel?+=?new?System.Windows.Forms.MouseEventHandler（this.Form1_MouseWheel）;
}
private?void?Form1_PreviewKeyDown（object?sender?PreviewKeyDownEventArgs?e）
{
if?（e.KeyValue?==?27）
{
Close（）;
}
}
private?void?Form1_MouseWheel（object?sender?System.Windows.Forms.MouseEventArgs?e）
{
if?（e.Delta?>?0）
{
zoom?+=?zommDelta;
}
else
{
zoom?-=?zommDelta;
if?（zoom? }
DoMove（）;
}
private?void?timer1_Tick（object?sender?EventArgs?e）
{
DoMove（）;
}
private?void?DoMove（）
{
Point?newMousePosition?=?MousePosition;
if?（lastMousePosition?!=?newMousePosition?||?lastZoom?!=?zoom）
{
lastZoom?=?zoom;
offset?=?lastMousePosition?-?new?Size（newMousePosition）;
lastMousePosition?=?newMousePosition;
Point?mousePosition?=?MousePosition;
mousePosition.Offset（-Width?/?2?-Height?/?2）;
Bitmap?newMap?=?GetScreen（new?Rectangle（mousePosition?Size））;
if?（tempMap?!=?null）
{
Graphics?g?=?Graphics.FromImage（newMap）;
g.DrawImage（tempMap?offset）;
}
tempMap?=?newMap;
Location?=?mousePosition;
Invalidate（）;
}
}
private?void?Form1_Shown（object?sender?EventArgs?e）
{
DoMove（）;
}
protected?override?void?OnPaint（PaintEventArgs?e）
{
e.Graphics.DrawImage（tempMap?-Width?*?（zoom?-?1）?/?2?-Height?*?（zoom?-?1）?/?2?Width?*?zoom?Height?*?zoom）;
}
[DllImportAttribute（“gdi32.dll“）]
public?static?extern?bool?BitBlt（
IntPtr?hdcDest
int?nXDest
int?nYDest
int?nWidth
int?nHeight
IntPtr?hdcSrc
int?nXSrc
int?nYSrc
System.Int32?dwRop
）;
private?Bitmap?GetScreen（Rectangle?rect）
{
Graphics?grpScreen?=?Graphics.FromHwnd（IntPtr.Zero）;
Bitmap?bitmap?=?new?Bitmap（rect.Width?rect.Height?grpScreen）;
Graphics?grpBitmap?=?Graphics.FromImage（bitmap）;
IntPtr?hdcScreen?=?grpScreen.GetHdc（）;
IntPtr?hdcBitmap?=?grpBitmap.GetHdc（）;
BitBlt（hdcBitmap?0?0?bitmap.Width?bitmap.Height?hdcScreen?rect.X?rect.Y?0x00CC0020）;
grpBitmap.ReleaseHdc（hdcBitmap）;
grpScreen.ReleaseHdc（hdcScreen）;
grpBitmap.Dispose（）;
grpScreen.Dispose（）;
?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件??????10240??2013-06-07?13:39??WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe
?????文件??????28160??2013-06-07?13:39??WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.pdb
?????文件??????11608??2013-06-07?13:40??WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe
?????文件????????490??2010-03-17?22:39??WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe.manifest
?????文件???????3035??2013-06-07?13:40??WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs
?????文件???????1817??2013-06-06?17:56??WindowsFormsApplication1\WindowsFormsApplication1\Form1.Designer.cs
?????文件???????6011??2013-06-06?17:56??WindowsFormsApplication1\WindowsFormsApplication1\Form1.resx
?????文件???????5513??2013-06-07?13:39??WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache
?????文件????????516??2013-06-06?17:56??WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\GenerateResource-ResGen.read.1.tlog
?????文件???????1198??2013-06-06?17:56??WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\GenerateResource-ResGen.write.1.tlog
?????文件???????1416??2013-06-07?13:40??WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.csproj.FileListAbsolute.txt
?????文件??????10240??2013-06-07?13:39??WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.exe
?????文件????????180??2013-06-06?17:56??WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.Form1.resources
?????文件??????28160??2013-06-07?13:39??WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.pdb
?????文件????????180??2013-06-06?14:56??WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.Properties.Resources.resources
?????文件????????418??2013-06-06?14:50??WindowsFormsApplication1\WindowsFormsApplication1\Program.cs
?????文件???????1460??2013-06-06?14:50??WindowsFormsApplication1\WindowsFormsApplication1\Properties\AssemblyInfo.cs
?????文件???????2528??2013-06-06?14:50??WindowsFormsApplication1\WindowsFormsApplication1\Properties\Resources.Designer.cs
?????文件???????5612??2013-06-06?14:50??WindowsFormsApplication1\WindowsFormsApplication1\Properties\Resources.resx
?????文件???????1031??2013-06-06?14:50??WindowsFormsApplication1\WindowsFormsApplication1\Properties\Settings.Designer.cs
?????文件????????249??2013-06-06?14:50??WindowsFormsApplication1\WindowsFormsApplication1\Properties\Settings.settings
?????文件???????3455??2013-06-06?14:56??WindowsFormsApplication1\WindowsFormsApplication1\WindowsFormsApplication1.csproj
?????文件????????914??2013-06-06?14:50??WindowsFormsApplication1\WindowsFormsApplication1.sln
????..A..H.?????17920??2013-06-07?13:40??WindowsFormsApplication1\WindowsFormsApplication1.suo
?????目錄??????????0??2013-06-06?14:50??WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\TempPE
?????目錄??????????0??2013-06-07?13:39??WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug
?????目錄??????????0??2013-06-06?14:56??WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug
?????目錄??????????0??2013-06-06?14:50??WindowsFormsApplication1\WindowsFormsApplication1\obj\x86
?????目錄??????????0??2013-06-06?14:50??WindowsFormsApplication1\WindowsFormsApplication1\bin
?????目錄??????????0??2013-06-06?14:50??WindowsFormsApplication1\WindowsFormsApplication1\obj
............此處省略6個文件信息
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