Specifies the shape to be used at the ends of open subpaths (and dashes, if any) when they are stroked.
public enum PdfLineCap
ButtEnd = 0
The stroke is squared off at the endpoint of the path. There is no projection beyond the end of the path.
ProjectingSquare = 2
The stroke continues beyond the endpoint of the path for a distance equal to half the line width and is squared off.
Round = 1
A semicircular arc with a diameter equal to the line width is drawn around the endpoint and filled in.