Re: Adding class to SVG Export

["jul gil gmail com" <jul gil gmail com>]

On Mon, Oct 21, 2013 at 10:20 PM, Hans Breuer <hans breuer org> wrote:
> At 21.10.2013 16:48, jul gil gmail com wrote:
> > Hi
> >
> > I am trying to use Dia to generate svg diagram for presentations build
> > using reveal.js, and I need to modify the way the svg is exported.
> >
> > Context : Reveal.js https://github.com/hakimel/reveal.js/ is a small
> > framework for creating presentation using HTML. Of course SVG can be
> > included in the HTML file.
> > One of the feature of reveal.js is to be able to display the content
> > of a slide step by step using the class "fragment"( See
> > https://github.com/hakimel/reveal.js/#fragments and
> > http://lab.hakim.se/reveal-js/#/fragments ).
> > A small test shows that it work for SVG too : I can have a beautiful
> > diagramm in my page that appears step by step, the problem is I just
> > need to edit the SVG by hand...I would like to use Dia for that, of
> > course.
> >
> > I have actually 2 problems :
> >
> > - include class and data-fragment-index in the properties :
> > easy for the shapes thanks to <ext_attributes>, but I have no idea of
> > what to modify to add a property to arrow, lines, polygon, etc...
> It might be possible to use the objects meta data dicitionary for this, but
> only the current development version has a GUI for it.
>
> Another idea could be to manage you animations by distributing objects to
> layers and encode class and index in the layer name.
>
>
> > - SVG export : it seems to me that 2 exports exists : diasvg.py and an
> > integrated export.
> > The python script is called when using export "SVG plain" or "SVG
> > compressed", the integrated export is called on "Scalable Vector
> > Graphic". Right ?
>
> Mostly. There usually is a third SVG exporter provided by the cairo plug-in,
> but it's availability depends on the buid system configuration.
>
>
> > The 2 exports are not exactly the same, the integrated export
> > generated <g> for each element, and that's on this element I want to
> > add the class. The python script seems not be able to add those tag,
> > but I am perhaps wrong.
> The two exporters are definitely not exactly the same. They are
> intentionally producing different output. With the current development
> version it is possible to handle group creation on the object's rendering
> level. See:
> https://git.gnome.org/browse/dia/commit/?id=3cf5a400d9924a7dc6fc5e67cec166a466885887

Seems perfect for what I want to do. I think I need to install the
development version.

> > So my questions are : am I on the right way ? Is it possible to do
> > what I want without modifying a single line of code ?
>
> How is the behavior of the source code supposed to be changed without
> changing the source code?

My question was : does exists another solution that I didn't found ?
another script to convert .dia to .svg not included in the main
distribution ? It seems not.

> > is it worth it ?
>
> Not sure I get this question. Shouldn't you be the one to answer it?

Yes, of course, I just mean : is it something that can interest
someone else, and will it be integrated in the main source code ?


--
Julien Gilles.