Re: Reset environment between MetaPost graphics?

[Hans Hagen via ntg-context <ntg-context@ntg.nl>]

On 1/20/2022 2:59 PM, 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?
you could do

   save u; u = 1cm;

or

   u := 1cm;

or

   numeric u; u := 1cm;

or you could use a dedicated instance (normally not needed)

Hans


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________