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%D \module
%D [ file=anch-box,
%D version=2022.03.25,
%D title=\CONTEXT\ Anchoring Macros,
%D subtitle=Boxes,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\writestatus{loading}{ConTeXt Anchoring Macros / Boxes}
\unprotect
\startMPpositiongraphic{mypos:boxanchor:arrow}{}% from,to,linecolor,text,alternative,leftedge,rightedge,distance}
anch_box_arrows_draw ;
\stopMPpositiongraphic
\tolerant\permanent\protected\def\connectboxanchors[#1]#*[#2]#*[#3]#*[#4]#*#:#5#6%
{\begingroup
\defineboxanchor[#5]%
\setboxanchor[#5][#1][#3]\hpack{\xypos{\namespacedboxanchor{#5}}}%
\ifparameter#3\or\setupboxanchorcontent[#1][#3]\fi
\defineboxanchor[#6]%
\setboxanchor[#6][#2][#4]\hpack{\xypos{\namespacedboxanchor{#6}}}%
\ifparameter#4\or\setupboxanchorcontent[#1][#4]\fi
% \startpositionoverlay{text-1}% will become configurable region
\startpositionoverlay{text+1}% will become configurable region
\setMPpositiongraphic
{\namespacedboxanchor{#5}}%
{\namedboxanchorcontentparameter{#1}\c!mp}%
{from=\namespacedboxanchor{#5},%
to=\namespacedboxanchor{#6},%
distance={\namedboxanchorcontentparameter{#1}\c!distance},%
dashtype={\namedboxanchorcontentparameter{#1}\c!dash},%
alternative={\namedboxanchorcontentparameter{#1}\c!alternative},%
text={\namedboxanchorcontentparameter{#1}\c!text},%
rulethickness={\namedboxanchorcontentparameter{#1}\c!rulethickness},%
linecolor=\namedboxanchorcontentparameter{#1}{\c!rulecolor}}%
\stoppositionoverlay
\endgroup}
% dedicated or not
\tolerant\permanent\protected\def\connectmatrixanchors[#1]#*[#2]#*[#3]#*[#4]#*#:#5#6%
{\begingroup
\doifelseinset{#5}{\m_anch_matrix_list}\donetrue\donefalse
\ifdone\else
\defineboxanchor[#5]%
\setboxanchor[#5][#1][#3]\hpack{\xypos{\namespacedboxanchor{#5}}}%
\xdef\m_anch_matrix_list{\m_anch_matrix_list,#5}%
\fi
\ifparameter#3\or\setupboxanchorcontent[#1][#3]\fi
\doifelseinset{#6}{\m_anch_matrix_list}\donetrue\donefalse
\ifdone\else
\defineboxanchor[#6]%
\setboxanchor[#6][#2][#4]\hpack{\xypos{\namespacedboxanchor{#6}}}%
\xdef\m_anch_matrix_list{\m_anch_matrix_list,#6}%
\fi
\ifparameter#4\or\setupboxanchorcontent[#1][#4]\fi
\startpositionoverlay{text-1}% will become configurable region
\setMPpositiongraphic
{\namespacedboxanchor{#5}}%
{\namedboxanchorcontentparameter{#1}\c!mp}%
{from=\namespacedboxanchor{#5},%
to=\namespacedboxanchor{#6},%
distance={\namedboxanchorcontentparameter{#1}\c!distance},%
dashtype={\namedboxanchorcontentparameter{#1}\c!dash},%
alternative={\namedboxanchorcontentparameter{#1}\c!alternative},%
text={\namedboxanchorcontentparameter{#1}\c!text},%
rulethickness={\namedboxanchorcontentparameter{#1}\c!rulethickness},%
linecolor=\namedboxanchorcontentparameter{#1}{\c!rulecolor},%
% matrix specific:
leftedge=\namespacedboxanchor\c!leftedge,%
rightedge=\namespacedboxanchor\c!rightedge}%
\stoppositionoverlay
\endgroup}
\let\m_anch_matrix_list\empty
\tolerant\permanent\protected\def\startmatrixanchors
{\glet\m_anch_matrix_list\empty
\defineboxanchor[\v!leftedge]%
\setboxanchor[\v!leftedge][\v!leftedge]\hpack{\xypos{\namespacedboxanchor\v!leftedge}}%
\defineboxanchor[\v!rightedge]%
\setboxanchor[\v!rightedge][\v!rightedge]\hpack{\xypos{\namespacedboxanchor\v!rightedge}}%
\setupmathfence[\c!leftsource=\v!leftedge,\c!rightsource=\v!rightedge]}
\tolerant\permanent\protected\def\stopmatrixanchors
{\setupmathfence[\c!leftsource=,\c!rightsource=]%
\glet\m_anch_matrix_list\empty}
\defineboxanchorcontent
[arrow]
[\c!mp=mypos:boxanchor:arrow,
\c!distance=1.5\exheight,
\c!rulethickness=\linewidth,
\c!rulecolor=textcolor]
\defineboxanchorcontent
[\v!top]
[arrow]
[\c!corner=\v!height,
\c!location=\v!depth,
\c!yoffset=.25\exheight,
\c!alternative=\v!top]
\defineboxanchorcontent
[\v!bottom]
[arrow]
[\c!corner=\v!depth,
\c!location=\v!height,
\c!yoffset=-\namedboxanchorcontentparameter{top}\c!yoffset,
\c!alternative=\v!bottom]
\defineboxanchorcontent
[\v!left]
[arrow]
[\c!corner={\v!middle,\v!left},
\c!xoffset=-1.25\emwidth,
\c!alternative=\v!left]
\defineboxanchorcontent
[\v!right]
[arrow]
[\c!corner={\v!middle,\v!right},
\c!xoffset=-\namedboxanchorcontentparameter{left}\c!xoffset,
\c!alternative=\v!right]
\defineboxanchorcontent
[\v!leftedge]
[\v!left]
[\c!xoffset=-.25\exheight]
\defineboxanchorcontent
[\v!rightedge]
[\v!right]
[\c!xoffset=0.25\exheight] % we are centered
\defineboxanchorcontent[\v!middle:\v!bottom][\v!bottom][\c!alternative=\v!middle,\c!yoffset=-.5\exheight]
\defineboxanchorcontent[\v!middle:\v!top ][\v!top ][\c!alternative=\v!middle,\c!yoffset=.5\exheight]
\defineboxanchorcontent[\v!middle:\v!left ][\v!left ][\c!alternative=\v!middle,\c!xoffset=-.5\exheight]
\defineboxanchorcontent[\v!middle:\v!right ][\v!right ][\c!alternative=\v!middle,\c!xoffset=.5\exheight]
\defineboxanchorcontent
[\v!left:\v!bottom]
[\v!bottom]
[\c!alternative=\v!middle,
\c!corner={\v!left,\v!depth},
\c!xoffset=-.25\exheight,
\c!yoffset=-.25\exheight]
\defineboxanchorcontent
[\v!right:\v!bottom]
[\v!bottom]
[\c!alternative=\v!middle,
\c!corner={\v!right,\v!depth},
\c!xoffset=.25\exheight,
\c!yoffset=-.25\exheight]
\defineboxanchorcontent
[\v!left:\v!top]
[\v!top]
[\c!alternative=\v!middle,
\c!corner={\v!left,\v!height},
\c!xoffset=-.25\exheight,
\c!yoffset=.25\exheight]
\defineboxanchorcontent
[\v!right:\v!top]
[\v!top]
[\c!alternative=\v!middle,
\c!corner={\v!right,\v!height},
\c!xoffset=.25\exheight,
\c!yoffset=.25\exheight]
\protect
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