ByteScout PDF SDK – C# – Drawing – Transparency

ByteScout PDF SDK – C# – Drawing – Transparency

Program.cs

using System.Diagnostics;
using Bytescout.PDF;

namespace Transparency
{
    /// <summary>
    /// This example demonstrates how to draw transparent objects.
    /// </summary>
    class Program
    {
        static void Main()
        {
            // Create new document
            Document pdfDocument = new Document();
            pdfDocument.RegistrationName = "demo";
            pdfDocument.RegistrationKey = "demo";
            // Add page
            Page page = new Page(PaperFormat.A4);
            pdfDocument.Pages.Add(page);

            Canvas canvas = page.Canvas;

            // Prepare pens and brushes
            Pen borderPen = new SolidPen(new ColorRGB(0, 0, 0), 2f);
            
            SolidBrush brush1 = new SolidBrush(new ColorRGB(255, 0, 0));
            SolidBrush brush2 = new SolidBrush(new ColorRGB(0, 0, 255));
            
            borderPen.Opacity = 50;
            brush1.Opacity = 30;
            brush2.Opacity = 60;

            // Draw normal rectangles
            canvas.DrawRectangle(brush1, 100, 100, 100, 100);
            canvas.DrawRectangle(borderPen, brush2, 150, 150, 100, 100);

            borderPen.Opacity = 80;
            brush1.Opacity = 60;
            brush2.Opacity = 30;

            // Draw rounded rectangles
            canvas.DrawRoundedRectangle(brush1, 220, 100, 100, 100, 10);
            canvas.DrawRoundedRectangle(borderPen, brush2, 270, 150, 100, 100, 10);
            
            // 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);
        }
    }
}

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