Example initializes a straight line is a circle, click the center of the circle drag the circle, click on a straight line midpoint drag on pictureBox a straight line, mouse anti-generated circles and straight lines

pictureBoxPaint\Cricle.cs
...............\Form2.cs
...............\Form2.Designer.cs
...............\Form2.resx
...............\Line.cs
...............\obj\Debug\pictureBoxPaint.csproj.GenerateResource.Cache
...............\...\.....\TempPE\Properties.Resources.Designer.cs.dll
...............\...\.....\WCircle.Form1.resources
...............\...\.....\WCircle.Form2.resources
...............\...\.....\WCircle.pdb
...............\...\.....\WCircle.Properties.Resources.resources
...............\...\MouseDragCurve.csproj.FileListAbsolute.txt
...............\...\pictureBoxPaint.csproj.FileListAbsolute.txt
...............\pictureBoxPaint.csproj
...............\pictureBoxPaint.sln
...............\pictureBoxPaint.suo
...............\Program.cs
...............\...perties\AssemblyInfo.cs
...............\..........\Resources.Designer.cs
...............\..........\Resources.resx
...............\..........\Settings.Designer.cs
...............\..........\Settings.settings
...............\obj\Debug\Refactor
...............\...\.....\TempPE
...............\bin\Debug
...............\obj\Debug
...............\bin
...............\obj
...............\Properties
pictureBoxPaint

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