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patrickroux / dompdf

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Transparent watermark required #486

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
What steps will reproduce the problem?
I am creating watermark on the PDF. the code is running fine. But,the watermark 
which is produced, hides the text which is beneath it.

What is the expected output? What do you see instead?
Watermark which is transparent and makes the text underneath readable

What version of dompdf are you using? What version of PHP? On what
operating system?
DOMPDF 5

Please provide the HTML source code you want to convert, or any additional
information.
<script type="text/php">
   $pdf->open_object();
   $w = $pdf->get_width();
   $h = $pdf->get_height();
   $pdf->close_object();
   $pdf->page_text(110, $h - 240, "DELETED", Font_Metrics::get_font("verdana", "bold"),110, array(0.85, 0.85, 0.85), 0, -52);
</script>

Original issue reported on code.google.com by bthakk...@gmail.com on 19 May 2012 at 9:42

GoogleCodeExporter commented 9 years ago 
One of the problems with text generated using inline script is that it always 
appears on top of any text generated as a result of rendering the HTML content. 
Of course, that wouldn't be huge a problem if the page_text function support 
opacity. The function itself will accept that value, but it won't pass it along 
to the renderer.

The lack of opacity support may be a bug in the code, I'd have to look at how 
the functionality interacts with the rendering engine. However, we're not 
patching 0.5.1 anymore don't expect the functionality to be fixed.

That being said, it looks like what you really want is the following:

<script type="text/php">
   $watermark = $pdf->open_object();
   $w = $pdf->get_width();
   $h = $pdf->get_height();
   $pdf->text(110, $h - 240, "DELETED", Font_Metrics::get_font("verdana", "bold"),110, array(0.85, 0.85, 0.85), 0, -52);
   $pdf->close_object();
   $pdf->add_object($watermark, 'all');
</script>

See how I'm using the `text` method instead of the `page_text` method. 
`page_text` places text using a global object, whereas `text` places the text 
in the current object. You can create unattached objects that you then place in 
the rendered document. So if you create your object on the first page using the 
above code you can propagate that object to all pages of your document.

---

Another option would be to upgrade to 0.6.0. Using this version you can achieve 
the same effect using CSS.

Original comment by eclecticgeek on 21 May 2012 at 2:51

GoogleCodeExporter commented 9 years ago 
Thanks for your suggestions. I upgraded the version to 0.6.0. I copied your 
code as above but things are not working so well. 
As read in the related link :  
http://stackoverflow.com/questions/4862417/dompdf-watermark-image-header-and-foo
ter-issues
I tried to change the opacity of the text in page_text() in cpdf_adapter.php 
but it was not giving me the transparent effect, so for now i have inserted an 
image that is running as a background. 
<style>
body
{ 
background-image: url($imagepath);
background-repeat: no-repeat;
background-attachment: fixed;
background-position: center; 
}
</style>

Let me know if there is some alternative for achieving the same using watermark 
rather than back ground image

Original comment by bthakk...@gmail.com on 22 May 2012 at 8:51

GoogleCodeExporter commented 9 years ago 
In 0.6.0 I would create the watermark completely in CSS instead. See the 
example here:
http://eclecticgeek.com/dompdf/debug.php?identifier=39d5d59fb77827b137c76c644a9f
2621

Original comment by eclecticgeek on 31 May 2012 at 1:56

GoogleCodeExporter commented 9 years ago 
Hello Sir,
The link that you have given below is great and has solved my problem.
Thanks a lot![?][?]
Regards

Original comment by bthakk...@gmail.com on 1 Jun 2012 at 7:12

GoogleCodeExporter commented 9 years ago 
how to add shadow/outline in text using
<script type="text/php">
   $watermark = $pdf->open_object();
   $w = $pdf->get_width();
   $h = $pdf->get_height();
   $pdf->text(110, $h - 240, "DELETED", Font_Metrics::get_font("verdana", "bold"),110, array(0.85, 0.85, 0.85), 0, -52);
   $pdf->close_object();
   $pdf->add_object($watermark, 'all');
</script>

Original comment by ankita.g...@gmail.com on 1 Apr 2013 at 11:51

GoogleCodeExporter commented 9 years ago

Original comment by eclecticgeek on 30 May 2013 at 5:16