Re: weekend upload - stacking and animation

[Floris van Manen <vm@klankschap.nl>]

On 13/07/2021 15:14, Hans Hagen wrote:
> How about:
> 
> \startuseMPgraphic{demo}
>      for i=1 upto 10:
>          draw fullcircle scaled (i*cm/3)
>              withcolor (i*red/10)
>              withpen   pencircle scaled (bp/2)
>              withstacking i
>          ;
>      endfor ;
> \stopuseMPgraphic
> 
> \unprotect
> 
> \tolerant\protected\def\useMPanimation[#1]#2%
>    {\begingroup
>     \scratchtoks\emptytoks
> 
> \dorecurse{10}{\etoksapp\scratchtoks{{\useMPgraphic[\c!stacking={\recurselevel}]{#2}}}}% 
> 
>     \expanded{\startanimation[#1]\the\scratchtoks\stopanimation}%
>     \endgroup}
> 
> \protect
> 
> \setupinteraction[state=start]
> 
> \usemodule[animation]
> 
> \starttext
>      \useMPanimation[menu=yes]{demo}
> \stoptext

Placing this excerpt in a file and compiling it I get an error:


$ context animation.tex

resolvers       | formats | executing runner 'run luametatex format': 
/home/vm/context/tex/texmf-linux-64/bin/luametatex --jobname="animation" 
--fmt=/home/vm/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luametatex/cont-en.fmt 
--lua=/home/vm/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luametatex/cont-en.lui 
cont-yes.mkiv --c:currentrun=1 --c:fulljobname="./animation.tex" 
--c:input="./animation.tex" --c:kindofrun=1 --c:maxnofruns=9 
--c:texmfbinpath="/home/vm/context/tex/texmf-linux-64/bin"
open source     > level 1, order 1, name 'cont-yes.mkiv'
fonts           > beware: no fonts are loaded yet, using 'lm mono' in box
system          >
system          > ConTeXt  ver: 2021.07.10 21:51 LMTX  fmt: 2021.7.12 
int: english/english
system          > system          > 'cont-new.mkxl' loaded
open source     > level 2, order 2, name 
'/home/vm/context/tex/texmf-context/tex/context/base/mkxl/cont-new.mkxl'
system          > beware: some patches loaded from cont-new.mkiv
close source    > level 2, order 2, name 
'/home/vm/context/tex/texmf-context/tex/context/base/mkxl/cont-new.mkxl'
system          > files > jobname './animation', input 
'./animation.tex', result './animation'
fonts           > latin modern fonts are not preloaded
languages       > language 'en' is active
open source     > level 2, order 3, name './animation.tex'
modules         > 'animation' is not found
fonts           > preloading latin modern fonts (second stage)
fonts           > 'fallback modern-designsize rm 12pt' is loaded
tex error       > tex error on line 31 in file ./animation.tex: 
Undefined control sequence

\startanimation [menu=yes]{\useMPgraphic 
[stacking={1}]{demo}}{\useMPgraphic [stacking={2}]{demo}}{\useMPgraphic 
[stacking={3}]{demo}}{\useMPgraphic [stacking={4}]{demo}}{\useMPgraphic 
[stacking={5}]{demo}}{\useMPgraphic [stacking={6}]{demo}}{\useMPgraphic 
[stacking={7}]{demo}}{\useMPgraphic [stacking={8}]{demo}}{\useMPgraphic 
[stacking={9}]{demo}}{\useMPgraphic [stacking={10}]{demo}}

<argument> \startanimation [menu=yes]\the \scratchtoks \stopanimation

<macro> \expanded #1->\xdef \m_syst_helpers_expanded {\noexpand #1
     }\m_syst_helpers_expanded
<macro> \useMPanimation [#1]#2->\begingroup \scratchtoks \emptytoks \par 
\dorecurse {10}{\etoksapp \scratchtoks {{\useMPgraphic [\c!stacking 
={\recurselevel }]{#2}}}}\expanded {\startanimation [#1]\the 
\scratchtoks \stopanimation }
     \endgroup

<line 4.31>     \useMPanimation[menu=yes]{demo}

21        \expanded{\startanimation[#1]\the\scratchtoks\stopanimation}%
22        \endgroup}
23
24     \protect
25
26     \setupinteraction[state=start]
27
28     \usemodule[animation]
29
30     \starttext
31 >>      \useMPanimation[menu=yes]{demo}
32     \stoptext
33
The control sequence at the end of the top line of your error message 
was never
\def'ed. You can just continue as I'll forget about whatever was undefined.
mtx-context     | fatal error: return code: 256

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