LineCap
Specifies the available cap styles with which a Pen object can end a line.
AnchorMask = 240
Specifies a custom line cap.
ArrowAnchor = 20
Specifies an arrow-shaped anchor cap.
Custom = 255
Specifies a mask used to check whether a line cap is an anchor cap.
DiamondAnchor = 19
Specifies a diamond anchor cap.
Flat = 0
Specifies a flat line cap.
NoAnchor = 16
Specifies no anchor.
Round = 2
Specifies a round line cap.
RoundAnchor = 18
Specifies a round anchor cap.
Square = 1
Specifies a square line cap.
SquareAnchor = 17
Specifies a square anchor line cap.
Triangle = 3
Specifies a triangular line cap.