[scribus-dev] Path Clipping Library

[Christoph Bartoschek]

I tried to look into lib2geom but it does not seem to handle the different
fill rules correctly.

How about adding the Clipper library (
https://sourceforge.net/projects/polyclipping/) to third_party? I attach an
according patch.

Using it I did not see clipping problems with my test cases (even though
QPainterPath is still used for curves)

Christoph

Am Mi., 1. Apr. 2020 um 12:45 Uhr schrieb Jean Ghali <jghali at libertysurf.fr
>:

> Le 31/03/2020 à 22:53, Christoph Bartoschek a écrit :
> > Hi,
> >
> > as you have seen in https://bugs.scribus.net/view.php?id=16073
>  QPainterPath::intersected()
> > is buggy. Does Scribus already have or do you know a library that
> correctly implements
> > clipping?
> >
> > For PDF import it is necessary that the library can set non-zero winding
> rule or even-odd
> > rule to each path and then compute the correct output.
> >
> > I tried to look at some candidates:
> > Cairo: Not sure but it looks to me as if the fill rule cannot be set
> independently between
> > the current clip path and the new one.
> > lib2geom: Cannot find how to set the fill rule for a path.
> >
>
> At the moment we do not have any specific library for computing clipping
> intersection.
> The lib2geom version we ship with our source code is also very old so you
> should maybe
> look at the latest code. Inkscape developers have continued improving
> lib2geom and this
> library has a repository on GitLab:
> https://gitlab.com/inkscape/lib2geom
>
> Jean
>
>
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>
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