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
>> 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
--
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