On Fri, Oct 31, 2014 at 10:05:35AM +0100, Hans Hagen wrote:
> On 10/31/2014 9:58 AM, Tobias Columbus wrote:
> >Hi again,
> >
> >I tried my example from yesterday in context with metapost format, but
> >the output still differs from what mptopdf produces.
> >
> >While doing that, I noticed that the mpost format is currently not usable
> >out of
> >the box:
> >
> >\startMPcode{metapost}
> > draw (0,0) -- (1cm,0) ;
> >\stopMPcode
> >
> >produces the error message
> >
>
> \startMPcode
> draw (0,0) -- (1cm,0) ;
> \stopMPcode
>
> why the {metapost}
I wanted to know if the impact of clipping is caused by the metafun format.
According to the wiki page
http://wiki.contextgarden.net/Command/defineMPinstance the instances "metapost"
and "metafun" are predefined and can be used by
\startMPcode{instance}
...
\stopMPcode
where metafun is the default instance, i.e. used when there is no instance
given.
>
> >>>mfun_first_run
> >>>true
> >! Equation cannot be performed (numeric=boolean).
> >
> >and the same for 'mfun_trial_run'. Simply adding
> >
> >boolean mfun_trial_run, mfun_first_run ;
> >
> >to texmf/metapost/base/mpost.mp resolved the issue for me. However, that may
> >introduce other complications that I have no idea of.
> >
> >Tobias
> >
> >
> >
> >On Thu, Oct 30, 2014 at 08:56:34PM +0100, Tobias Columbus wrote:
> >>Dear all,
> >>
> >>I stumbled upon some very weird behaviour of clipping in metafun/context.
> >>When I
> >>add some clipped pictures to currentpicture and draw something dashed, some
> >>subsequent lines will also be drawn dashed.
> >>
> >>This behaviour only shows up with context but not with mptopdf or mpost. I
> >>attached a minimal example and the corresponding output of context and
> >>mptopdf.
> >>
> >>I tried context versions 2014.05.21 22:04 and 2014.10.29 17:47, but the
> >>result
> >>is the same in both.
> >>
> >>Tobias
> >>
> >>
> >>
> >>
> >>--
> >
> >>
> >>vardef mycircle =
> >> save c ; picture c ; c := nullpicture ;
> >> addto c contour fullcircle scaled 2mm ;
> >> c
> >>enddef ;
> >>
> >>def a expr p =
> >> path _p_ ; _p_ := p ;
> >> a_impl
> >>enddef ;
> >>
> >>def a_impl text t =
> >> begingroup
> >> save c ; picture c ; c := mycircle ;
> >> clip c to bbox c scaled 0.5 ;
> >> addto currentpicture also c t ;
> >> addto currentpicture doublepath _p_ t ;
> >> endgroup
> >>enddef ;
> >>
> >>def b expr p =
> >> path _p_ ; _p_ := p ;
> >> b_impl
> >>enddef ;
> >>
> >>def b_impl text t =
> >> begingroup
> >> save c; picture c ; c := mycircle ;
> >> addto currentpicture also c t ;
> >> addto currentpicture doublepath _p_ t ;
> >> endgroup
> >>enddef ;
> >>beginfig(1)
> >>
> >> a (0,0) -- (1cm,0) dashed evenly ;
> >> currentpicture := currentpicture shifted (2cm,0) ;
> >> a (0,0) -- (1cm,0) ;
> >>
> >> currentpicture := currentpicture shifted (-2cm, 0.5cm );
> >>
> >> b (0,0) -- (1cm,0) dashed evenly ;
> >> currentpicture := currentpicture shifted (2cm,0) ;
> >> b (0,0) -- (1cm,0) ;
> >>
> >>endfig ;
> >>end
> >
> >
> >
> >
>
>
> --
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
> | www.pragma-pod.nl
> -----------------------------------------------------------------
> ___________________________________________________________________________________
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>
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> ___________________________________________________________________________________
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If your question is of interest to others as well, please add an entry to the
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archive : http://foundry.supelec.fr/projects/contextrev/
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