using System;

using iTextSharp.text;

using iTextSharp.text.pdf;

using System.Drawing;

using System.Drawing.Imaging;

using System.IO;

public class Program

{

    public static void Main()

    {

            Document doc = new Document(PageSize.A4);

            PdfWriter.GetInstance(doc, new FileStream("GraficoPDF.pdf", FileMode.Create));

            doc.Open();

​

            // Criando um bitmap para o gráfico

            Bitmap bmp = new Bitmap(500, 300);

            using (Graphics g = Graphics.FromImage(bmp))

            {

                g.Clear(Color.White);

                g.FillRectangle(Brushes.Blue, 50, 50, 200, 100); // Exemplo de gráfico simples

            }

​

            // Convertendo o bitmap para um stream

            using (MemoryStream ms = new MemoryStream())

            {

                bmp.Save(ms, ImageFormat.Png);

                Image img = Image.GetInstance(ms.ToArray());

                doc.Add(img);

            }

​

            doc.Close();

    }

}