PDF Mosaic: How to add polygon annotation to PDF documents

using PDFMosaic;
using System;
using System.Drawing;
 
namespace PDFPolygonAnnotationSample
{
    class PDFPolygonAnnotationSample
    {
        static void Main()
        {
            PDFDocument pdf = new PDFDocument();
            pdf.Pages.Add(new PDFPage(PDFPaperFormat.A4));
            Random rnd = new Random();
            PDFInkList list = new PDFInkList();
            PointF[] f = new PointF[10];
            for (int j = 0; j < 10; ++j)
            {
                int min = rnd.Next(100);
                int max = rnd.Next(100, 600);
                for (int i = 0; i < f.Length; ++i)
                {
                    f[i].X = rnd.Next(min, max);
                    f[i].Y = rnd.Next(min, max);
 
                }
                list.AddArray(new PDFPointsArray(f));
            }
            PDFPolygonAnnotation annotation = new PDFPolygonAnnotation(list[0]);
            PDFPolylineAnnotation annotation1 = new PDFPolylineAnnotation(list[1]);
            annotation1.StartLineStyle = PDFLineEndingStyle.Circle;
            annotation1.EndLineStyle = PDFLineEndingStyle.RClosedArrow;
            annotation1.BackgroundColor = new PDFColorRGB((byte)rnd.Next(255), (byte)rnd.Next(255), (byte)rnd.Next(255));
            annotation1.Contents = "PDF polygon annotation";
            annotation.BackgroundColor = new PDFColorRGB((byte)rnd.Next(255), (byte)rnd.Next(255), (byte)rnd.Next(255));
            annotation.Color = new PDFColorRGB((byte)rnd.Next(255), (byte)rnd.Next(255), (byte)rnd.Next(255));
            annotation1.Color = new PDFColorRGB((byte)rnd.Next(255), (byte)rnd.Next(255), (byte)rnd.Next(255));
            annotation1.Contents = "PDF polyline annotation";
            pdf.Pages[0].Annotations.Add(annotation);
            pdf.Pages[0].Annotations.Add(annotation1);
            pdf.Save("TestPolygonAndPolylineAnnotation.pdf", true);
        }
    }
}