From: Marco Patzer <homerow@lavabit.com>
To: ntg-context@ntg.nl
Subject: Re: command for a MP graphic
Date: Tue, 7 May 2013 09:51:49 +0200 [thread overview]
Message-ID: <20130507075149.GM663@homerow> (raw)
In-Reply-To: <B19DA7FE-010F-4A1E-B350-3277FA2B1A17@gmail.com>
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On 2013–05–07 Roland Thiers wrote:
> Hi,
> I did this code to get a regular polygon with metafun, it works but
> I would like to have an user command like \define or \def
> to be able to choose the number of sides, n. I don't know how to do
> that ...
Here's one way to do it:
\startuniqueMPgraphic{polygoneregulier}{sides}
drawoptions (withpen pencircle scaled 2pt);
numeric u ; u:=1*cm ;
numeric n ; n:=\MPvar{sides};
pair a[];
a[0]:=(0,3u);
path polygone[] ;
for i=1 upto n :
a[i]:=a[0] rotatedaround(origin,i*360/n) ;
polygone[i]:=a[i-1]--a[i];
draw polygone[i]; endfor;
draw fullcircle scaled 6u withcolor blue;
\stopuniqueMPgraphic
%% \polyreg{<number>}
\define[1]\polyreg
{\setupMPvariables[polygoneregulier][sides=#1]%%
\uniqueMPgraphic{polygoneregulier}}
\starttext
\dontleavehmode
\dorecurse{9}{\polyreg\recurselevel\space}
\stoptext
You can extent this to be able to use key-value syntax or default
values if you like.
Marco
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next prev parent reply other threads:[~2013-05-07 7:51 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-07 7:30 Roland Thiers
2013-05-07 7:51 ` Marco Patzer [this message]
2013-05-07 10:55 ` Roland Thiers
2013-05-07 11:05 ` Wolfgang Schuster
2013-05-07 20:28 ` Roland Thiers
2013-05-08 4:56 ` Wolfgang Schuster
2013-05-08 6:22 ` Roland Thiers
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