[poppler] Annotation creation using Poppler

[Francesco Gabbanini]

Fabio,

Sorry, I was specifying wrong coordinates...

Now I am able to annotate a document using Poppler::LineAnnotation 
objects (am I correct if I assume that coordinates are given as 
percentages of the page size?) and to view them on various PDF Viewers.

I am also able to add Poppler::TextAnnotation's to a document.

However they appear as an icon when I open the document (bot using the 
poppler_qt4viewer distributed with Poppler and using Nitro PDF). Are 
there settings that allow to view them "exploded", i.e, with their 
associated text displayed on one the PDF page's sides?

Thanks and best regards,
Francesco.

-------- Original Message --------
Subject: 	Re: [poppler] Annotation creation using Poppler
Date: 	Thu, 24 May 2012 17:46:21 +0200
From: 	Francesco Gabbanini <fgabbanini at gmail.com>
To: 	poppler at lists.freedesktop.org



Many thanks for your help Fabio!

I have tryed to work on your example and wrote the following code:

Poppler::LineAnnotation *ia = new 
Poppler::LineAnnotation(Poppler::LineAnnotation::StraightLine);
QLinkedList<QPointF> points;
points.push_back(QPointF(50, 50));
points.push_back(QPointF(150, 150));

ia->setLinePoints(points);
Poppler::Annotation::Style style;
style.setColor(QColor(0, 0, 0));
style.setWidth(4.0);
ia->setStyle(style);

Poppler::Page *p = _doc->page(npage);
p->addAnnotation(ia);

Poppler::PDFConverter *conv = _doc->pdfConverter();
conv->setOutputFileName(QString("C:/Users/.../test.pdf"));
conv->setPDFOptions(conv->pdfOptions() | 
Poppler::PDFConverter::WithChanges);
conv->convert();

I then tried to open the document with Nitro PDF Professional.
It seems that the annotation is there, because it is displayed by Nitro 
PDF when I click on the "Comments" button, but I cannot see it on the 
screen (I expected to see it drawn over the document).
I also tried to open the PDF with the Chrome browser's internal viewer, 
but the result is the same.

Am I missing something?

Thanks in advance,
Francesco.



On 18/05/2012 17:03, Fabio D'Urso wrote:
> On Friday, May 18, 2012 03:34:53 PM Francesco Gabbanini wrote:
>> I noticed that version 0.20 of Poppler has introduced the possibility of
>> adding, modifying and removing annotations from PDF documents. These
>> features seem to be available through the qt4 interface library as well.
> Correct. Note that only a subset of what we promise to do is implemented
> (setters for some properties, notably timestamps and popup window, are noops).
>
>> I have read the qt4 interface documentation and I found that annotation
>> creation seems to be possible by calling the static method
>> Poppler::AnnotationUtils::createAnnotation(const QDomElement
>> &annElement), which returns a pointer to an Annotation.
> It's one of the two possible ways. The other one is to use the constructor of
> the annotation type you want to create (eg new InkAnnotation) and use setters
> to set the properties.
>
>> I was wondering what is that QDomElement&  that has to be given as an
>> input to the method.
> It's a undocumented format to describe the annotations. You can some get
> examples calling AnnotationUtils::storeAnnotation on existing annotations.
> If you have Okular installed, it's also the same format Okular uses to store
> user-created annotations internally (in ~/.kde/share/apps/okular/docdata/).
>
>> Is there some documentation around describing how to work with
>> annotations using the qt4 interface?
>> Or maybe, does anybody have a simple example on how to create
>> annotations in a PDF using the qt4 interface?
> No full examples yet. In general, it goes like this:
>   Document* document = Document::load(inputfilename);
>   Page* pdfPage = document->page(pagenum); // 0-based
>   InkAnnotation *ann = new InkAnnotation();
>   // Set its properties here ...
>   pdfPage->addAnnotation(ann);
>   // ... or here (they both work)
>   PDFConverter *conv = document->pdfConverter();
>   conv->setOutputFileName(outputfilename);
>   conv->setPDFOptions(conv->pdfOptions() | PDFConverter::WithChanges);
>   conv->convert();
>
> Supported annotation types are: Text, Line, Geom, Ink, Stamp, Highlight.
> Note that StampAnnotations are stored to file, but they're not rendered by
> poppler at the moment.
>
> *IMPORTANT*:
> Oops! I forgot to make TextAnnotation ctor public. I'm attaching a patch.
>
> Fabio
>
>
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> poppler at lists.freedesktop.org
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