PDF Mosaic: How to draw circles and ellipses in PDF documents

using PDFMosaic;
using System;
using System.Drawing;
 
namespace CirclesEllipses
{
    class CirclesEllipses
    {
        static void Main()
        {
            PDFDocument document = new PDFDocument();
            document.Pages.Add(new PDFPage(PDFPaperFormat.A4));
 
            PDFCanvas canvas = document.Pages[0].Canvas;
            PDFPath path = new PDFPath();
            path.AddEllipse(50, 50, document.Pages[0].Width - 100, document.Pages[0].Height - 100);
            canvas.SetClip(path);
            canvas.DrawPath(new PDFSolidPen(), path);
            path.Reset();
 
            Random rand = new Random();
            for (int i = 0; i < 200; ++i)
            {
                float x = (float)rand.NextDouble() * (document.Pages[0].Width - 100 + 1);
                float y = (float)rand.NextDouble() * (document.Pages[0].Height - 100 + 1);
                float s = (float)rand.NextDouble() * (150 + 1);
 
                if (i % 2 == 0)
                {
                    path.AddCircle(x, y, s);
                }
                else
                {
                    float k = (float)rand.NextDouble() * (150 + 1);
                    path.AddEllipse(x, y, s, k);
                }
                PDFColor color = new PDFColorRGB((byte)rand.Next(256), (byte)rand.Next(256), (byte)rand.Next(256));
                canvas.DrawPath(new PDFSolidPen(color), new PDFSolidBrush(color), path);
                path.Reset();
            }
 
            path.AddEllipse(50, 50, document.Pages[0].Width - 100, document.Pages[0].Height - 100);
            canvas.SetClip(path);
            PDFSolidPen pen = new PDFSolidPen();
            pen.Width = 2.5f;
            canvas.DrawPath(pen, path);
 
            document.Save("TestCirclesEllipses.pdf", true);
        }
    }
}