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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