Re: [NTG-context] troubles with \MPinclusions (Taco Hoekwater)
Thanks for your answers, I could significantly reduce my long timeline code. > 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. > So, got one more z-related error in Metapost. I bet this is absolutely the n.1 on help-lists. Btw, if I were a scientist, I'd realized that defining x as a pair is quite heretic… And that sounds much familiar to an historian. Damien Thiriet ___ 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 ___
Re: [NTG-context] troubles with \MPinclusions
> On 21 Feb 2019, at 10:03, Damien Thiriet 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
> 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
> ___
Taco Hoekwater
Elvenkind BV
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Re: [NTG-context] troubles with \MPinclusions
On 2/21/2019 10:03 AM, Damien Thiriet wrote:
Hi,
Why does (1) compile, whereas (2) doesn't?
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 ?
those that are likely to clash later
\startMPinclusions
vardef MyStuff =
numeric u;
u:=1mm ;
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) ;
enddef ;
\stopMPinclusions
\startreusableMPgraphic{test}
save p, u, x ;
MyStuff ;
draw p ;
for i=0 step 1 until 3 :
drawdot x[i] ;
endfor ;
\stopreusableMPgraphic
\starttext
\reuseMPgraphic{test}
\stoptext
but in your case you could as well put the inclusions in the test
graphic itself
\startreusableMPgraphic{test}
save p, u, x ;
numeric u;
u:=1mm ;
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) ;
draw p ;
for i=0 step 1 until 3 :
drawdot x[i] ;
endfor ;
\stopreusableMPgraphic
\starttext
\reuseMPgraphic{test}
\stoptext
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-
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[NTG-context] troubles with \MPinclusions
Hi,
Why does (1) compile, whereas (2) doesn't?
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
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
___
