Hi Ben, yes I am lurking :-)
About manipulating PDFs - this is really easy and people have done that:
Aik-Siong Koh needed to split large PDFs into one-page PDFs and Holger Kleinsorgen answered on vwnc with the following code to do that:
| inputStream inputPDF pageNumber |
inputStream := 'ReleaseNotes7.7.pdf' asFilename readStream binary.
[
inputPDF := PDF.File readFrom: inputStream.
pageNumber := 1.
inputPDF trailer Root pagesDo: [ : page |
| targetFilename onePageDocument |
onePageDocument := PDF.Document new.
onePageDocument root addPage: page.
targetFilename := (pageNumber printString, '.pdf') asFilename.
onePageDocument saveAs: targetFilename.
pageNumber := pageNumber + 1.
].
] ensure: [ inputStream close ].
Bob Nemec (Author of Report4PDF) needed to add a document to another. The how-to is on the docs wiki:
http://www.freelists.org/post/pdf4st/Append-another-PDF-document
Lately, I had to put a chart onto an existing PDF page which contained background (with shadows which I cannot do yet) and I was surprised myself how easy that was (just add another content stream to the existing one).
All this is nice and easy, because PDF is so well structured - I love it :-)
Cheers,
Christian
> -----Ursprüngliche Nachricht-----
> Von: pharo-project-bounces(a)lists.gforge.inria.fr [mailto:pharo-project-
> bounces(a)lists.gforge.inria.fr] Im Auftrag von Ben Coman
> Gesendet: Sonntag, 31. März 2013 13:46
> An: Pharo-project(a)lists.gforge.inria.fr
> Betreff: Re: [Pharo-project] PDF Rendering
>
> Hi Christian, Didn't realize you were on list. Thanks for the clarification.
>
> Do you think that PDF4Smalltalk would be suited to build a tool for
> splitting/joining pages, and perhaps also adding watermarks to pages?
> For instance, I often use tools like pdfmerge [1] for this. These are quite
> popular tools and would gain a lot of interest from the "general user"
> community.
>
> [1] http://download.cnet.com/PdfMerge/3000-2351_4-75766462.html
>
> cheers -ben
>
> Christian Haider wrote:
> > My name is Haider (sticky fingers are not polite with proper names...).
> >
> > My PDF library has nothing to do with rendering (putting the graphics on
> the screen) and I doubt that Artefact will do that.
> > IMHO, rendering PDF is quite a challenge...
> >
> > Cheers,
> > Christian (HAIDER)
>
>
> Ben Coman wrote:
> > Thanks Stef. Actually I have had some recent discussion with
> > Christian about porting to Pharo. He seems open to the idea but for a
> > while he is committed to other earn-a-living activities.
> > However back to my original question, I believe neither Artefact or
> > PDF4Smalltalk yet do PDF rendering to screen pixels. Although I think
> > that PDF4Smalltalk would make a good base for this. As a distant goal
> > I dream of having a PDF Editor inside Pharo. First just being able to
> > split/join pages and later being able to draw on top of existing
> > documents.
> > cheers -ben
> >
> >
> > stephane ducasse wrote:
> >> Else there is also the work of Christian Haidler.
> >> Artefact developers will release soon a 0.9 version once they fix the
> >> jpeg inclusion Stef
> >>
> >>
> >>>> I was looking around for PDF rendering libraries that might be used
> >>>> with NativeBoost and they all seem to be licensed GPL, which is not
> >>>> compatible with Pharo's preference for the MIT license. Then I
> >>>> came across Apache licensed pdf.js [1] which sparked my
> >>>> curiosity.... There are a few projects to have Smalltalk run on top
> >>>> of Javascript, but has anyone looked at the reverse, running
> >>>> javascript inside a Smalltalk image? Perhaps handing the
> >>>> Javascript off via NativeBoost to a Javascript VM like SquirrelFish
> >>>> [2]. Or is that just a bad idea?
> >>>>
> >>>> cheers -ben
> >>>>
> >>>> [1] http://andreasgal.com/2011/06/15/pdf-js/
> >>>> [2] https://www.webkit.org/blog/189/announcing-squirrelfish/
> >>>>
> >>> Maybe you already knew about Artefact - a PDF framework for Pharo
> >>>
> >>> http://forum.world.st/Artefact-a-PDF-framework-td4585877.html
> >>>
> >>> A solution in Smalltalk is more useful in the long term, IMHO, in
> >>> the sense that it can then be read, understood, maintained by the
> >>> community instead of being a black box.
> >>>
> >>> Sven
> >>>
> >>> --
> >>> Sven Van Caekenberghe
> >>> http://stfx.eu
> >>> Smalltalk is the Red Pill
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >>
> >
> >
> >
>
>
>
Hi,
If you want to tweet/follow what is going on at PharoConf and MooseDay, please use #pharoconf and #mooseday.
Cheers,
Doru
--
www.tudorgirba.com
"Beauty is where we see it."
