Specialized rendering (was Re: Feature request)

[Hans Breuer <hans breuer org>]

At 13.01.2011 17:18, Max Wahler wrote:
> [...]
> My problem now is, that the generated SVG is pretty nice, but there's no
> possibility to give the UML elements identifiers that themselves become
> id attributes of the generated SVG group tags.
Not sure if I understand, but sounds like part of this could be possible 
with some recent and not so recent additions. With
        http://git.gnome.org/browse/dia/commit/?id=3cf5a40
it is possible to interweave meta information from the object level with 
drawing information.

There also is a meta info property editor for most objects (unfortunately 
not yet for complex objects - e.g. UML-Class - which bring their own 
property editing. See:
        http://git.gnome.org/browse/dia/tree/NEWS?id=3cf5a40#n5

> That'd allow me to simply
> put the results of the tests in a CSS that color the UML elements by
> naming them like the element identifiers.
What's the element identifier? If you refer to e.g. the name property of 
the UML-Class object, than the above may work. But if you are refering to 
the id used in the diagram file, please read:
http://mail.gnome.org/archives/dia-list/2009-December/msg00007.html

> Since my C(++) skills are not very good I'd love to see someone
> implement that feature in Dia!
Depending on which SVG exporter you are using C skills are not necessary.
There are three of them:
  SVG(cairo) - probably the best visual quality and most complex SVG,
               generation is done by the respective cairo backend.
               Text is converted to outlines.
  SVG(C)- named "Scalable Vector Graphics" - based on Dia's built-in
          SvgRenderer also used for shape export
  SVG(py) - named "SVG plain" - implemented as Python-Dia plug-in should be
            easy enough to modify

Another option could be to split the rendering and the meta information 
generation in two separate plug-ins like I've tried to show with the html 
image map plug-in:
http://git.gnome.org/browse/dia/tree/plug-ins/python/imgmap.py

-------- Hans "at" Breuer "dot" Org -----------
Tell me what you need, and I'll tell you how to
get along without it.                -- Dilbert