static void Main() { var pdf = new CGContextPDF(NSUrl.FromFilename("demo.pdf"), new RectangleF(0, 0, 617, 792)); pdf.BeginPage(null); pdf.SetRGBFillColor(1, 0, 0, 1); pdf.AddArc(300, 300, 100, 0, (float)(2 * Math.PI), true); pdf.FillPath(); pdf.EndPage(); pdf.Flush(); }