[NTG-context] Clipping bug in MetaPost with MkIV

luigi scarso luigi.scarso at gmail.com
Thu Oct 30 10:53:33 CET 2008


On Thu, Oct 30, 2008 at 9:47 AM, Hans Hagen <pragma at wxs.nl> wrote:

> Wolfgang Schuster wrote:
> > Hi,
> >
> > I make a hole in a MetaPost graphic and add a graphic as background but
> > in MkIV I get no hole but the lines I try to remove are still visible.
> >
> > All files with the two results from MkII (what I want) and MkIV are in
> > the attachment.
> >
> > \starttext
> >
> > \startMPcode
> >
> > picture temp ;
> > path mask ;
> >
> > draw (0,1cm)--(2cm,1cm) ;
> > draw (1cm,0)--(1cm,2cm) ;
> >
> > temp := currentpicture ;
> > currentpicture := nullpicture ;
> > mask := unitsquare scaled 2cm -- reverse fullsquare scaled 1cm shifted
> > (1cm,1cm) -- cycle ;
> > clip temp to mask ;
> > currentpicture := temp ;
> > draw fullsquare scaled 5mm shifted (1cm,1cm) ;
> >
> > temp := currentpicture ;
> > currentpicture := nullpicture ;
> > externalfigure "holz280.jpg" scaled 2cm ;
> > addto currentpicture also temp ;
> >
> > \stopMPcode
> >
> > \stoptext
>
> i have no clue (nor time to look into it in detail) but this seems to
> work ok:
>
> % engine=luatex interface=en
>
> \starttext
>
> \startMPpage
>     externalfigure "cow.pdf" scaled 2cm ;
>     clip currentpicture to boundingbox currentpicture -- reverse
> unitsquare scaled 1cm shifted (.5cm,.5cm) -- cycle ;
> \stopMPpage
>
> \stoptext
>
>
it works witk minimals-beta
This is LuaTeX, Version snapshot-0.30.2-2008102016, build unknown
ConTeXt  ver: 2008.10.30 08:50 MKIV  fmt: 2008.10.30  int: english/english


-- 
luigi
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