''' <summary>
''' Adds text (not transparent and transparent, not rotated and rotated) to a PDF page.
''' </summary>
''' <param name="pdfFilename">The PDF filename.</param>
Public Shared Sub AddTextToPdfPage(pdfFilename As String)
    ' create new PDF document
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename, Vintasoft.Imaging.Pdf.PdfFormat.Pdf_16)
        ' add empty page (A4 size)
        Dim page As Vintasoft.Imaging.Pdf.Tree.PdfPage = document.Pages.Add(Vintasoft.Imaging.PaperSizeKind.A4)

        ' get PdfGraphics for PDF page
        Using g As Vintasoft.Imaging.Pdf.Drawing.PdfGraphics = page.GetGraphics()
            ' create a font that should be used for drawing a text
            Dim font As Vintasoft.Imaging.Pdf.Tree.Fonts.PdfFont = document.FontManager.GetStandardFont(Vintasoft.Imaging.Pdf.Tree.Fonts.PdfStandardFontType.TimesRoman)

            ' draw NOT transparent and NOT rotated text on PDF page
            Dim redBrush As New Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Red)
            g.DrawString("Not transparent text", font, 30, redBrush, New System.Drawing.PointF(50, 250))

            ' draw transparent and NOT rotated text on PDF page
            Dim transparentRedBrush As New Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.FromArgb(64, 255, 0, 0))
            g.DrawString("Transparent text", font, 30, transparentRedBrush, New System.Drawing.PointF(50, 350))

            ' draw NOT transparent and rotated text on PDF page
            Dim blueBrush As New Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Blue)
            g.SaveGraphicsState()
            Dim m As New Vintasoft.Imaging.AffineMatrix()
            ' rotate at 30 degress around (X=50, Y=450) point
            m.RotateAt(30, 50, 450)
            g.MultiplyTransform(m)
            g.DrawString("Rotated text", font, 30, blueBrush, New System.Drawing.PointF(50, 450))
            g.RestoreGraphicsState()
        End Using

        ' save changes in PDF document
        document.SaveChanges()
    End Using
End Sub

/// <summary>
/// Adds text (not transparent and transparent, not rotated and rotated) to a PDF page.
/// </summary>
/// <param name="pdfFilename">The PDF filename.</param>
public static void AddTextToPdfPage(string pdfFilename)
{
    // create new PDF document
    using (Vintasoft.Imaging.Pdf.PdfDocument document =
        new Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename, Vintasoft.Imaging.Pdf.PdfFormat.Pdf_16))
    {
        // add empty page (A4 size)
        Vintasoft.Imaging.Pdf.Tree.PdfPage page = document.Pages.Add(
            Vintasoft.Imaging.PaperSizeKind.A4);

        // get PdfGraphics for PDF page
        using (Vintasoft.Imaging.Pdf.Drawing.PdfGraphics g = page.GetGraphics())
        {
            // create a font that should be used for drawing a text
            Vintasoft.Imaging.Pdf.Tree.Fonts.PdfFont font = document.FontManager.GetStandardFont(
                Vintasoft.Imaging.Pdf.Tree.Fonts.PdfStandardFontType.TimesRoman);

            // draw NOT transparent and NOT rotated text on PDF page
            Vintasoft.Imaging.Pdf.Drawing.PdfBrush redBrush =
                new Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Red);
            g.DrawString("Not transparent text", font, 30, redBrush, new System.Drawing.PointF(50, 250));

            // draw transparent and NOT rotated text on PDF page
            Vintasoft.Imaging.Pdf.Drawing.PdfBrush transparentRedBrush =
                new Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.FromArgb(64, 255, 0, 0));
            g.DrawString("Transparent text", font, 30, transparentRedBrush, new System.Drawing.PointF(50, 350));

            // draw NOT transparent and rotated text on PDF page
            Vintasoft.Imaging.Pdf.Drawing.PdfBrush blueBrush =
                new Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Blue);
            g.SaveGraphicsState();
            Vintasoft.Imaging.AffineMatrix m = new Vintasoft.Imaging.AffineMatrix();
            // rotate at 30 degress around (X=50, Y=450) point
            m.RotateAt(30, 50, 450);
            g.MultiplyTransform(m);
            g.DrawString("Rotated text", font, 30, blueBrush, new System.Drawing.PointF(50, 450));
            g.RestoreGraphicsState();
        }

        // save changes in PDF document
        document.SaveChanges();
    }
}