<PackageReference Include="System.Drawing.Common" Version="5.0.1" />

LineCap

public enum LineCap
namespace System.Drawing.Drawing2D { public enum LineCap { AnchorMask = 240, ArrowAnchor = 20, Custom = 255, DiamondAnchor = 19, Flat = 0, NoAnchor = 16, Round = 2, RoundAnchor = 18, Square = 1, SquareAnchor = 17, Triangle = 3 } }