<PackageReference Include="System.Drawing.Common" Version="8.0.0-preview.1.23110.8" />

LineCap

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