Clipping bug in MetaPost with MkIV

Clipping bug in MetaPost with MkIV

[Wolfgang Schuster]

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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

Wolfgang

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Re: Clipping bug in MetaPost with MkIV

[Hans Hagen]

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




-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Clipping bug in MetaPost with MkIV

[luigi scarso]

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On Thu, Oct 30, 2008 at 9:47 AM, Hans Hagen <pragma@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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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Clipping bug in MetaPost with MkIV

[luigi scarso]

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On Thu, Oct 30, 2008 at 9:06 AM, Wolfgang Schuster <
schuster.wolfgang@googlemail.com> 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
>
The same results here
Linux mark 2.6.18-1.2798.fc6 #1 SMP Mon Oct 16 14:37:32 EDT 2006 i686 i686
i386 GNU/Linux
This is LuaTeX, Version snapshot-0.30.2-2008102016, build unknown
MtxRun | current version: 2008.10.30 08:50

-- 
luigi

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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________