path box ; box :=3D = positionbox(texstr("self")) ; box :=3D box enlarged texvar("filloffset") = ; fill box withcolor texvar("fillcolor") ; draw box withcolor = texvar("linecolor") withpen pencircle scaled texvar("linewidth") ; = positioninregion ; ; metapost > trace >=20 backend > xmp > using file = '/Users/Gavin/context-osx-arm64/tex/texmf-context/tex/context/base/mkiv/lp= df-pdx.xml' pages > flushing realpage 1, userpage 1, subpage 1= --Apple-Mail=_61A8C835-480D-485E-82B9-7ED2E7BE9106 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 =

Hello list,

I=E2=80=99m trying to = reproduce the positional graphics examples in the MetaFun manual on pp. = 151-153. There are two examples of code for the mpos:box. The first = example uses \MPvar to retrieve variables set = using \setupMPvariables. This works fine. The second example uses = texvar to retrieve variables, but it does not work in the current LMTX. = However, the second example does work with my TeXLive install.

I=E2=80=99ve put my = working example below, with both versions of the mpos:box code. Log = output from a failed run is below that. Any ideas where I might be going = wrong?

Thanks!

Gavin

\setupbackgrounds

= [page]

= [background=3D{backgraphics,foreground,foregraphics}]

\defineoverlay [backgraphics] = [\positionoverlay{backgraphics}]

\defineoverlay = [foregraphics] [\positionoverlay{foregraphics}]

\setupMPvariables

[mpos:box]

= [linecolor=3Dblue,

= linewidth=3D\linewidth,

= fillcolor=3Dlightgray,

= filloffset=3D2pt]

%%%%%%%% This mpos:box works using \MPvar. = %%%%%%%

\startMPpositiongraphic{mpos:box}{fillcolor,linecolor,linewidth= }

string tag; tag :=3D "\MPvar{self}" = ;

path box ; box :=3D positionbox(tag) = ;

box :=3D box enlarged = \MPvar{filloffset} ;

fill = box

withcolor \MPvar{fillcolor} = ;

draw box

= withcolor \MPvar{linecolor}

= withpen pencircle scaled \MPvar{linewidth} ;

= positioninregion ;

\stopMPpositiongraphic

%%%%%%% This = mpos:box does not work using texvar. (log below) %%%%%%%

%\startMPpositiongraphic{mpos:box}{fillcolor,linecolor,linewidt= h}

% path box ; box :=3D = positionbox(texstr("self")) ;

% box :=3D box = enlarged texvar("filloffset") ;

% fill = box

% withcolor texvar("fillcolor") = ;

% draw box

% = withcolor texvar("linecolor")

% = withpen pencircle scaled texvar("linewidth") ;

% positioninregion ;

%\stopMPpositiongraphic

\starttext

to get \hpos {A-0} {positions} sorted

\startpositionoverlay{backgraphics}

= \setMPpositiongraphic{A-0}{mpos:box}{self=3DA-0}

\stoppositionoverlay

\stoptext

system = >

system = > ConTeXt ver: 2022.05.11 11:36 LMTX fmt: 2022.5.20 = int: english/english

system = >

system = > 'cont-new.mkxl' loaded

open = source > level 1, order 1, name = '/Users/Gavin/context-osx-arm64/tex/texmf-context/tex/context/base/mkxl/co= nt-new.mkxl'

system = > beware: some patches loaded from cont-new.mkiv

close source > level 1, order 1, name = '/Users/Gavin/context-osx-arm64/tex/texmf-context/tex/context/base/mkxl/co= nt-new.mkxl'

system = > files > jobname './ContractionExperiments', input = './ContractionExperiments.tex', result = './ContractionExperiments'

fonts = > latin modern fonts are not preloaded

languages > language 'en' is = active

system = > synctex functionality is enabled, expect 5-10 pct runtime = overhead!

open source > level 1, = order 2, name './ContractionExperiments.tex'

fonts = > preloading latin modern fonts = (second stage)

fonts = > 'fallback modern-designsize rm 12pt' is loaded

metapost > initializing = instance 'metafun:1' using format 'metafun' and method = 'double'

metapost > = loading 'metafun' as 'metafun.mpxl' using method 'double'

metapost > initializing number = mode 'double'

metapost = > trace > This is MPLIB for LuaMetaTeX, version 3.12, = running in double mode.

metapost = > trace >

metapost = > trace > loading metafun for lmtx, including = the plain 1.004 base definitions

metapost = > trace >

metafun = > log >

metafun = > log > error: Missing ')' has been = inserted

metafun > = log >

metapost > = trace > <to be read again> ,

metapost = > trace > <macro> paired -> = <primary> -> = begingroup.if.pair(EXPR2):(EXPR2)else:((EXPR2),(EXPR2))fi.endgroup

metapost > trace > <to = be read again> ,

metapost = > trace > <macro> llmoved -> -> = ((llcorner(EXPR0))shifted(-xpart.paired((EXPR1)),-ypart.paired((EXPR1))))<= /div>

metapost > trace > = <to be read again> {

metapost = > trace > <macro> -- -> -> = {curl1}..{curl1}

metapost = > trace > <macro> enlarged -> -> = ((EXPR0)llmoved(EXPR1)--(EXPR0)lrmoved(EXPR1)--(EXPR0)urmoved(EXPR1)--(EXP= R0)ulmoved(EXPR1)--cycle)

metapost = > trace > <to be read again> ;

metafun > log >

metafun > log > I found no = right delimiter to match a left one. So I've put one in, behind = the

scenes; this may fix the problem.

metafun > log >

metapost > trace > = <direct> path box ; box :=3D positionbox(texstr("self")) ; box :=3D = box enlarged texvar("filloffset") ; fill box withcolor = texvar("fillcolor") ; draw box withcolor texvar("linecolor") withpen = pencircle scaled texvar("linewidth") ; positioninregion ; ;

metapost > trace = >

backend > = xmp > using file = '/Users/Gavin/context-osx-arm64/tex/texmf-context/tex/context/base/mkiv/lp= df-pdx.xml'

pages = > flushing realpage 1, userpage 1, subpage = 1

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