PDF Mosaic: How to draw pies in PDF documents

using PDFMosaic;
using System.Drawing;
using System;
 
namespace PieAndTranslate
{
    class RectanglesAndTransparency
    {
        static void Main()
        {
            PDFDocument document = new PDFDocument();
            document.Pages.Add(new PDFPage(PDFPaperFormat.A4));
            PDFCanvas canvas = document.Pages[0].Canvas;
 
            PDFDeviceColor red = new PDFColorRGB(255, 0, 0);
            PDFDeviceColor green = new PDFColorRGB(0, 255, 0);
            PDFDeviceColor blue = new PDFColorRGB(0, 0, 255);
 
            PDFSolidBrush brush = new PDFSolidBrush(red);
            PDFSolidPen pen = new PDFSolidPen();
            pen.Width = 3;
 
            canvas.TranslateTransform(100, 200);
            canvas.DrawPie(brush, 0, 0, 50, 50, -90, 120);
            brush.Color = green;
            canvas.DrawPie(brush, 0, 0, 50, 50, 30, 120);
            brush.Color = blue;
            canvas.DrawPie(pen, brush, 0, 0, 50, 50, -90, -120);
 
            canvas.TranslateTransform(150, 0);
            canvas.ScaleTransform(1.5f, 1.5f);
            canvas.RotateTransform(90);
 
            brush.Color = red;
            canvas.DrawPie(brush, 0, 0, 50, 50, -90, 120);
            brush.Color = green;
            canvas.DrawPie(brush, 0, 0, 50, 50, 30, 120);
            brush.Color = blue;
            canvas.DrawPie(pen, brush, 0, 0, 50, 50, -90, -120);
 
            canvas.TranslateTransform(0, -150);
            canvas.ScaleTransform(1.5f, 1.5f);
            canvas.RotateTransform(45);
 
            brush.Color = red;
            canvas.DrawPie(brush, 0, 0, 50, 50, -90, 120);
            brush.Color = green;
            canvas.DrawPie(brush, 0, 0, 50, 50, 30, 120);
            brush.Color = blue;
            canvas.DrawPie(pen, brush, 0, 0, 50, 50, -90, -120);
 
            document.Save("PieAndTranslate.pdf", true);
        }
    }
}