The following code adds two pie slices to a document.
using var doc = new Doc();
doc.Width = 80;
doc.Rect.Inset(50, 50);
doc.Color.String = "255 0 0";
doc.AddPie(0, 90, true);
doc.Color.String = "0 255 0";
doc.AddPie(180, 270, false);
doc.Save("docaddpie.pdf");