From: Aditya Mahajan via ntg-context <ntg-context@ntg.nl>
To: Vincent Hennebert via ntg-context <ntg-context@ntg.nl>
Cc: Aditya Mahajan <adityam@umich.edu>
Subject: Re: Reset environment between MetaPost graphics?
Date: Thu, 20 Jan 2022 09:26:42 -0500 (EST) [thread overview]
Message-ID: <nycvar.YAK.7.78.908.2201200922410.453707@nqv-guvaxcnq> (raw)
In-Reply-To: <02d5d0c2ea4b0cbcf8c8693a8e89db1e9dc73721.camel@gmail.com>
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On Thu, 20 Jan 2022, Vincent Hennebert via ntg-context wrote:
> Hi,
>
> Say I’m writing a document containing many independent MetaPost
> figures. I don’t want to bother with enclosing each and every graphics
> in a ‘begingroup...endgroup’ with the appropriate ‘save’ statement. But
> I don’t want variables from previous graphics to leak into following
> ones either.
>
> Like this:
>
> % SOF
> \starttext
>
> Text about some topic.
>
> \startMPcode
> u=1cm;
> draw (-u, u)--origin--(u ,u);
> \stopMPcode
>
> Now on to another topic.
>
> \startMPcode
> u=2cm; % Triggers an error: Inconsistent equation (off by 28.34645)
> draw (-u, u)..origin..(u ,u);
> \stopMPcode
>
> \stoptext
> % EOF
>
> Is that achievable?
AFAIK, there is no in-built support for this.
I workaround this as follows. Instead of defining new variables using
numeric u; pair p; path q; etc.
use:
newnumeric u; newpair p; newpath p; etc.
which automatically does a save beforehand. The only place where the abstraction leaks is arrays. You cannot do,
newpair p[];
but need save p; pair p[] instead.
Another option is to use assignment rather than equality:
u := 2cm;
Aditya
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next prev parent reply other threads:[~2022-01-20 14:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-20 13:59 Vincent Hennebert via ntg-context
2022-01-20 14:26 ` Aditya Mahajan via ntg-context [this message]
2022-01-20 14:47 ` Hans Hagen via ntg-context
2022-01-21 9:47 ` Vincent Hennebert via ntg-context
2022-01-20 14:42 ` Hans Hagen via ntg-context
2022-01-20 14:55 ` Hans Hagen via ntg-context
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