Visual C# draw points defined by the four Point Bezier spline curves, draw four small circles represent each point, use a brush to fill the specified area, used PhotoShop graphics processing tools friends will understand this and the inside of the pen tool is very similar.

GDIApp2\GDIApp2\App.ico
.......\.......\AssemblyInfo.cs
.......\.......\Form1.cs
.......\.......\Form1.resx
.......\.......\GDIApp2.csproj
.......\.......\GDIApp2.csproj.user
.......\GDIApp2.sln
.......\GDIApp2.suo
.......\GDIApp2
GDIApp2

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