Can draw a continuous line segment, and to calculate the length. How to: draw a straight line button, then left-click on the drawing, move the mouse, and then click the left mouse button, you can keep the painting, right-click. Released. And calculate the length. Click on the curvature of the painting: drawing on the left-click on the start point, end point, mid-point, and then drag the arc moves. Get what you want and then click on the left-arc. I make an effort to write very useful code, we want to help.

testcircle\testcircle\bin\Debug\testcircle.exe
..........\..........\...\.....\testcircle.pdb
..........\..........\...\.....\testcircle.vshost.exe
..........\..........\Form1.cs
..........\..........\Form1.Designer.cs
..........\..........\Form1.resx
..........\..........\obj\Debug\testcircle.csproj.GenerateResource.Cache
..........\..........\...\.....\testcircle.exe
..........\..........\...\.....\testcircle.Form1.resources
..........\..........\...\.....\testcircle.pdb
..........\..........\...\.....\testcircle.Properties.Resources.resources
..........\..........\...\testcircle.csproj.FileListAbsolute.txt
..........\..........\Program.cs
..........\..........\...perties\AssemblyInfo.cs
..........\..........\..........\Resources.Designer.cs
..........\..........\..........\Resources.resx
..........\..........\..........\Settings.Designer.cs
..........\..........\..........\Settings.settings
..........\..........\testcircle.csproj
..........\testcircle.sln
..........\testcircle.suo
..........\..........\obj\Debug\TempPE
..........\..........\bin\Debug
..........\..........\obj\Debug
..........\..........\bin
..........\..........\obj
..........\..........\Properties
..........\testcircle
testcircle

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