[iText-questions] How to add transparency to a text

[François Miermont]

Hi,

 

I’m using iTextSharp v4.0.4 to create my PDF. I’m trying to add a text on
every page when my users wants to have a preview. I’m doing like this :

 

public class PDFListener : PdfPageEventHelper

{

    /** This is the contentbyte object of the writer */

    private PdfContentByte cbPreview;

    

    public override void OnOpenDocument(PdfWriter writer, Document document)

    {

         cbPreview = writer.DirectContent;

    }

 

    public override void OnEndPage(PdfWriter writer, Document document)

    { 

         cbPreview.SaveState();

         cbPreview.BeginText();

         cbPreview.SetFontAndSize(Font14Bold.BaseFont, 150);

         cbPreview.SetColorFill(new Color(200, 0, 0, 200));

         cbPreview.SetTextMatrix(0.5f, 0.5f, -0.5f, 0.5f, (PageSize.A4.Width
/ 2) - 100, (PageSize.A4.Height / 2) - 100);

         cbPreview.ShowText("PREVIEW");

         cbPreview.EndText();

         cbPreview.RestoreState();

    }

}

 

The problem is that the text does not use the Alpha parameter for the Color.
I’d like to have the “Preview” to be in top of document, but with
transparency. 

 

Is there a way to do this ?

 

Thanks for the help.


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