using System.Diagnostics;
using Bytescout.PDF;

namespace GraphicsState
{
    /// <summary>
    /// This example demonstrates how to save and restore the graphics state.
    /// </summary>
    class Program
    {
        static void Main()
        {
            // Create new document
            Document pdfDocument = new Document();
            pdfDocument.RegistrationName = "demo";
            pdfDocument.RegistrationKey = "demo";

            // If you wish to load an existing document uncomment the line below and comment the Add page section instead
            // pdfDocument.Load(@".\existing_document.pdf");

            // Add page
            Page page = new Page(PaperFormat.A4);
            pdfDocument.Pages.Add(page);
            
            Canvas canvas = page.Canvas;

            // Keep current graphics state
            canvas.SaveGraphicsState();

            // Transform coordinates and draw rectangle
            canvas.TranslateTransform(200, 200);
            canvas.RotateTransform(45);
            canvas.DrawRectangle(new SolidBrush(new ColorRGB(0, 0, 255)), 0, 0, 100, 100);

            // Restore the state and draw the same rectangle
            canvas.RestoreGraphicsState();
            canvas.DrawRectangle(new SolidBrush(new ColorRGB(255, 0, 0)), 200, 200, 100, 100);
            
            // Save document to file
            pdfDocument.Save("result.pdf");

            // Cleanup 
            pdfDocument.Dispose();

            // Open result document in default associated application (for demo purpose)
            ProcessStartInfo processStartInfo = new ProcessStartInfo("result.pdf");
            processStartInfo.UseShellExecute = true;
            Process.Start(processStartInfo);
        }
    }
}