PDFsharp & MigraDoc Foundation

PDFsharp - A .NET library for processing PDF & MigraDoc Foundation - Creating documents on the fly
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PostPosted: Wed Apr 25, 2018 4:22 pm 
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Posts: 6
I am using the WPF build of PDFSharp, version 1.32.2608.0.

I am trying to draw transparent text over the top of an image (over the top of an image of text, so that the user can select the text).

I tried this:

Code:
gfx.DrawString(text, font, XBrushes.Transparent, x, y);


but the drawn text was white and clearly visible over the text in the image.

I tried creating my own brush with full transparency:

Code:
new XSolidBrush(XColor.FromArgb(0,255,255,255)


same result, if I changed the custom brush to a color other than white, it just draws the color and ignores the transparency value. I also tried using 255 as the transparency value just in case, same result.

How do I draw ACTUAL transparent text? Or some workaround that accomplishes what I said at the beginning?

Any help is appreciated.


Last edited by prw56 on Wed Apr 25, 2018 4:33 pm, edited 1 time in total.

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PostPosted: Wed Apr 25, 2018 4:29 pm 
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empira Employee
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Joined: Mon Oct 16, 2006 8:16 am
Posts: 2847
Location: Cologne, Germany
Hi!

Welcome to the forum.

See also:
viewtopic.php?f=2&t=832

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Thomas Hoevel
PDFsharp Team


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PostPosted: Wed Apr 25, 2018 4:35 pm 
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Sorry about that, I added some more details, let me know if anything else is missing or if my question needs more explaining.


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PostPosted: Wed Apr 25, 2018 8:27 pm 
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Does the problem still exist with PDFsharp 1.50 RC2a?

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


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PostPosted: Wed Apr 25, 2018 8:36 pm 
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Joined: Sat Mar 14, 2015 10:15 am
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Did you set the PDF version to 1.4 or higher?
Code:
if (document.Version < 14)
    document.Version = 14;

Source:
http://pdfsharp.net/wiki/ColorsCMYK-sample.ashx

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


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