Re: [Qucs-devel] Dropping furture svg-ification

[roucaries b. <rou...@gm...>]

On 8/25/07, Oswald Buddenhagen <os...@kd...> wrote:
> On Sat, Aug 25, 2007 at 11:08:35PM +0530, Gopala Krishna wrote:
> > I [...] decided to drop out the future svg-ification of all the
> > components's schematic drawings because of following disadvantages.
> >
> > *) Basic reason is "unnecessity". Svg is needed for cool appearance at
> > all transformations(esp zoom). We can achieve this easily without svg
> > for our simple schematics.
> >
> pretty short-sighted, if you ask me.

I agree we you it is sight. Svg is not cool it is a standard therefore
instead you should use iy instead to reinvent the wheel.
Have you read http://www.carto.net/papers/svg/samples/styles.shtml.



> > *) Second reason is performance . Though this can be combated by
> > intelligent caching, we can not get very high improvements.
> >
> actually, the improvements are pretty drastical, as only the first time
> a particular symbol is needed with certain parameters it is rendered.
> afterwards it's just pixmaps as usual.

I agree performance of a gui is not really important. And caching
could improve all the drawback. Morevoer scg is device independant,
that is we could use it for printing without any degradation.

> > *) I couldn't discover a way to change the pen/stroke of an svg in
> > runtime.
> >
> like that, you mean?
> http://trolltech.com/developer/task-tracker/index_html?method=entry&id=126834
> :}
>
> > This is needed because i plan to introduce a feature to change the
> > color of component schematic (in runtime ofcourse!).
> >
> you can apply stylesheets to svgs.
> you could either load it into a QDom, manipulate it (some
> "qucs-standardized" node) and dump it back into a QByteArray or you just
> manipulate the svg in text form (the svg could contain a <!-- Put Qucs
> styles here --> string to be replaced) - i think i'd do the latter, as
> it is simpler and faster (even though it feels a bit hacky).

The best think for a performance point of view is:
- use one svg file by component and use external style as css
- create an unique datafile including all the component and rewrite
the external css file as internal using CDATA technic. The creating is
made using a script. Therefore no penalty at runtime.

What do you think?

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