> On 21 Feb 2019, at 10:03, Damien Thiriet <dam...@thiriet.web4me.fr> wrote:
> 
> Hi,
> 
> 
> Why does (1) compile, whereas (2) doesn’t?

For me, both compile. However (2) does not work.

1. Variable names x and y are special and cleared before
   every graphic. This is related to the fact that “z" is 
   defined as a shortcut for "(x,y)”. Both of these are
   traditional. 

   Every metapost graphic does at least this at its start:

   save x,y;
   currentpicture := nullpicture;
   currentpen:=defaultpen;
  
   so pair xx[]; would have worked just fine.

   In general, I would advice to stay away from single-letter
   variable names inside MPinclusions, and use CamelCase
   to avoid clashes with metafun internals.

2. You need a bigger pen to actually see the dots even if
   you change the variable name. :)

Best wishes,
Taco

> I can't understand why can MPinclusions store path and not pairs.  
> 
> 
> %%%%%%%%%%%% (1) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> \setuppapersize[A4,landscape]
> 
> \startMPinclusions
> u:=1mm ;
> %fond
> path p ;
> p:= (0,0) -- (150u,0) -- (150u,95u) -- (0,95u) -- cycle ;
> pair x[] ;
> x[0]:= (20u,90u) ;
> x[1]:= (40u,90u) ;
> x[2]:= (90u,90u) ;
> x[3]:= (140u,90u) ;
> \stopMPinclusions
> 
> \startreusableMPgraphic{test}
> draw p ;
> \stopreusableMPgraphic
> 
> \starttext 
>    \reuseMPgraphic{test}
> \stoptext
> 
> %%%%%%%%%%%% (1) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> \setuppapersize[A4,landscape]
> 
> \startMPinclusions
> u:=1mm ;
> %fond
> path p ;
> p:= (0,0) -- (150u,0) -- (150u,95u) -- (0,95u) -- cycle ;
> pair x[] ;
> x[0]:= (20u,90u) ;
> x[1]:= (40u,90u) ;
> x[2]:= (90u,90u) ;
> x[3]:= (140u,90u) ;
> \stopMPinclusions
> 
> \startreusableMPgraphic{test}
> draw p ;
> for i=0 step 1 until 3 :
>    drawdot x[i] ;
> endfor ;
> \stopreusableMPgraphic
> 
> \starttext 
>    \reuseMPgraphic{test}
> 
> 
> More generaly, which kind of variables cannot be stored in
> \startMPinclusions ?
> 
> Thanks,
> 
> 
> Damien Thiriet
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the 
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> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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> ___________________________________________________________________________________

Taco Hoekwater
Elvenkind BV




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