Under VS2010 development environment, using C# language, combined with simple drawing functions Emgucv implemented to achieve the double buffering, the code is simple, suitable for beginners.

DrawOnPicturebyMouse\DrawOnPicturebyMouse\bin\Debug\DrawOnPicturebyMouse.exe
....................\....................\...\.....\DrawOnPicturebyMouse.pdb
....................\....................\...\.....\DrawOnPicturebyMouse.vshost.exe
....................\....................\...\.....\DrawOnPicturebyMouse.vshost.exe.manifest
....................\....................\...\.....\Emgu.CV.dll
....................\....................\...\.....\Emgu.CV.ML.dll
....................\....................\...\.....\Emgu.CV.UI.dll
....................\....................\...\.....\Emgu.Util.dll
....................\....................\...\.....\lockscreen.jpg
....................\....................\...\.....\test.jpg
....................\....................\...\.....\ZedGraph.dll
....................\....................\DrawOnPicturebyMouse.csproj
....................\....................\Form1.cs
....................\....................\Form1.Designer.cs
....................\....................\Form1.resx
....................\....................\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache
....................\....................\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
....................\....................\...\...\.....\DrawOnPicturebyMouse.csproj.FileListAbsolute.txt
....................\....................\...\...\.....\DrawOnPicturebyMouse.csproj.GenerateResource.Cache
....................\....................\...\...\.....\DrawOnPicturebyMouse.csprojResolveAssemblyReference.cache
....................\....................\...\...\.....\DrawOnPicturebyMouse.exe
....................\....................\...\...\.....\DrawOnPicturebyMouse.Form1.resources
....................\....................\...\...\.....\DrawOnPicturebyMouse.pdb
....................\....................\...\...\.....\DrawOnPicturebyMouse.Properties.Resources.resources
....................\....................\Program.cs
....................\....................\...perties\AssemblyInfo.cs
....................\....................\..........\Resources.Designer.cs
....................\....................\..........\Resources.resx
....................\....................\..........\Settings.Designer.cs
....................\....................\..........\Settings.settings
....................\DrawOnPicturebyMouse.sln
....................\DrawOnPicturebyMouse.suo
....................\....................\obj\x86\Debug\TempPE
....................\....................\...\...\Debug
....................\....................\bin\Debug
....................\....................\obj\x86
....................\....................\bin
....................\....................\obj
....................\....................\Properties
....................\DrawOnPicturebyMouse
DrawOnPicturebyMouse

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