PDFsharp & MigraDoc Foundation

PDFsharp - A .NET library for processing PDF & MigraDoc Foundation - Creating documents on the fly
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PostPosted: Sun Aug 02, 2020 3:18 pm 
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Joined: Thu Jul 02, 2020 3:16 pm
Posts: 10
I am placing a Watermark on PDF files after they are generated.
I would like the user to have the ability to locate the Watermark on the PDF. For example, Top Left, Top Right, Center etc.

Is it possible to change the justification of the Watermark? Currently, it's defaulting to Top Left.
Based on the location of the Watermark I would like to change the justification of the Watermark accordingly.

Here's my code:

Sub PDFWatermark(ByRef PDFName As String, ByRef PDFProject As String, PDFQty As String)

Dim Watermark As String
Watermark = "Project: " + descAssyProject.Value + " - Project Qty: " + activeCompQty
Dim emSize As Integer = 50

Dim font = New XFont("Times New Roman", emSize, XFontStyle.BoldItalic)
Dim document = PdfReader.Open(PDFName)
If document.Version < 14 Then document.Version = 14

For idx = 0 To document.Pages.Count - 1
Dim page = document.Pages(idx)
Dim pHeight As Double = page.Height
pHeight = pHeight - (emSize * 1.5)
Dim pWidth As Double = page.Width
pWidth = pWidth / 2

Using gfx = XGraphics.FromPdfPage(page, XGraphicsPdfPageOptions.Prepend)
Dim size = gfx.MeasureString(Watermark, font)
Dim format = New XStringFormat()
format.Alignment = XStringAlignment.Near
format.LineAlignment = XLineAlignment.Near
Dim brush As XBrush = New XSolidBrush(XColor.FromArgb(128, 255, 0, 0))
gfx.DrawString(Watermark, font, brush, New XPoint(50, pHeight), format)
End Using
Next
document.Save(PDFName)
End Sub


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PostPosted: Mon Aug 03, 2020 8:37 am 
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PDFsharp Expert
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Joined: Sat Mar 14, 2015 10:15 am
Posts: 580
Location: CCAA
Hi!
JRDumont wrote:
Is it possible to change the justification of the Watermark?
You can invoke DrawString with a destination rectangle instead of a destination point. Then the various alignments make sense and you just have to change the flags of your "format" variable.

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Best regards
Thomas
(Freelance Software Developer with several years of MigraDoc/PDFsharp experience)


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