Re: gEDA-user: gschem with b-spline paths and filled sections

[Peter Clifton <pcjc2@xxxxxxxxx>]

On Sun, 2008-05-04 at 09:02 -0400, Ales Hvezda wrote:
> [snip]
> >Just thought I'd share a couple of screen-shots of a feature hopefully
> >targeted for gEDA 1.6.0, support for closed / filled polygons.
> >
> 
> 	Questions, why didn't you use gdk's simple polygon API for this?
> 
> (http://library.gnome.org/devel/gdk/2.12/gdk-Drawing-Primitives.html#gdk-draw-polygon)
> 
> 	Wouldn't using that gdk call be *magnitudes* faster (during
> rendering) and easier to implement (as the rest of gEDA/gaf uses gdk
> quite extensively)?  I am quite sensitive to users who use gEDA/gaf on
> older machines and maintaining the existing rendering performance is an
> important goal.

I'd not be opposed to rebasing this patch onto the existing code head,
so it doesn't rely on the cairo branch. For a first approximation, we
should just drop support for the Bezier path segments.

I see the first applications of this code as support for reading,
writing, perhaps manipulating an exiting object. That is still useful
(for making a pretty symbol library), even if gschem can't do
arbitrarily fancy things when editing them. (It is still useful even if
we have to hand-edit the symbol files to add polygons).

BTW... open path sections may give a speed win for gschem's fonts too.


Still TODO: Figure out how this maps to postscript output. Presumably it
is possible to translate pretty easily, but I'm no postscript guru.

-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)



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