[metapost] Filling complex paths

[Hans Hagen]

On 10/16/2014 11:44 PM, Tobias Columbus wrote:
> Hi all,
>
> I am currently writing a piece of software that should spit out some MetaPost
> code. My input are the closed curves of a glyph and I want to produce MetaPost
> code that fills them according to Postscript rules. However, as MetaPost cannot
> handle non-contiguous closed paths, this task seems difficult at least.
>
> Note that the glyphs come from non-Postscript fonts, so that the MetaPost
> "glyph" primitive does not work for me. I also tried "graphictext" as described
> in the Metafun manual but that turned out to be too inaccurate. I traced the
> inaccuracy back to "pstoedit", which is called for "graphictext".
>
> My attempt was to fiddle around with specials and
> withprescript/withpostscript.  This attempt turned out to be nonsense as
> addto always writes "stroke" or "fill" and my specials were ignored. I
> could, of course, write the whole glyph with specials, but I would
> prefer a cleaner solution.
>
> Has anybody some experience with this kind of problem? How difficult
> would it be to add filling of non-contiguous paths to MetaPost?

some of this unfilling is supported out of the box

\startMPpage

path p ; p := fullcircle scaled 10cm .. fullcircle scaled 5cm .. cycle ;
fill p ; drawarrow p withcolor red ;

currentpicture := currentpicture shifted (-11cm,0) ;

path p ; p := fullcircle scaled 10cm .. reverse fullcircle scaled 5cm .. 
cycle ;
fill p ; drawarrow p withcolor red ;

\stopMPpage


> Thank you in advance,
> Tobias
> --
> http://tug.org/metapost/
>


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