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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
\def\anch_box_connect_parameters#1#2%
{span=no,
from=\boxanchorposone,%
to=\boxanchorpostwo,%
distance={\namedboxanchorcontentparameter{#1}\c!distance},%
dashtype={\namedboxanchorcontentparameter{#1}\c!dash},%
arrow={\namedboxanchorcontentparameter{#1}\c!arrow},%
alternative={\namedboxanchorcontentparameter{#1}\c!alternative},%
text={\namedboxanchorcontentparameter{#1}\c!text},%
rulethickness={\namedboxanchorcontentparameter{#1}\c!rulethickness},%
linecolor=\namedboxanchorcontentparameter{#1}{\c!rulecolor},
#2}
\tolerant\permanent\protected\def\connectboxanchors[#1]#*[#2]#*[#3]#*[#4]#*#:#5#6%
{\begingroup
%
\edef\boxanchorone{\boxanchoringclass:#5}%
\edef\boxanchortwo{\boxanchoringclass:#6}%
% \edef\boxanchorone{#5}%
% \edef\boxanchortwo{#6}%
%
\doifnotanchorbox{\boxanchorone}{\defineboxanchor[\boxanchorone]}%
\doifnotanchorbox{\boxanchortwo}{\defineboxanchor[\boxanchortwo]}%
%
\edef\boxanchorposone{#1:#2:\namespacedboxanchor{\boxanchorone}}%
\edef\boxanchorpostwo{#1:#2:\namespacedboxanchor{\boxanchortwo}}%
% \edef\boxanchorposone{#1:#2:\number\namedboxanchor{\boxanchorone}}%
% \edef\boxanchorpostwo{#1:#2:\number\namedboxanchor{\boxanchortwo}}%
%
\setboxanchor[\boxanchorone][#1][#3]\hpack{\xypos{\boxanchorposone}}%
\setboxanchor[\boxanchortwo][#2][#4]\hpack{\xypos{\boxanchorpostwo}}%
%
\ifparameter#3\or\setupboxanchorcontent[#1][#3]\fi
\ifparameter#4\or\setupboxanchorcontent[#2][#4]\fi % used ?
%
\normalexpanded{%
\startpositionoverlay{text+1}% will become configurable region
\setMPpositiongraphic
{\boxanchorposone}%
{\namedboxanchorcontentparameter{#1}\c!mp}%
{\anch_box_connect_parameters{#1}{#3}}%
\stoppositionoverlay
}%
\ifcstok{\namedboxanchorcontentparameter{#1}\c!page}\v!yes
\normalexpanded{%
\startpositionoverlay{text+1}% will become configurable region
\setMPpositiongraphic
{\boxanchorpostwo}%
{\namedboxanchorcontentparameter{#1}\c!mp}%
{\anch_box_connect_parameters{#1}{#3}}%
\stoppositionoverlay
}%
\fi
\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},%
arrow={\namedboxanchorcontentparameter{#1}\c!arrow},%
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}
\lettonothing\m_anch_matrix_list
\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]
% \setupboxanchorcontent [top] [rulecolor=darkyellow]
% \setupboxanchorcontent [left] [rulecolor=darkred]
% \setupboxanchorcontent [bottom][rulecolor=darkblue]
% \setupboxanchorcontent [right] [rulecolor=darkgreen]
%
% \startbuffer
% \connectboxanchors[top] [top] [text={\small\small\strut\bf var 1}]{a1}{a2}
% \connectboxanchors[top] [top] [text={\small\small\strut\bf var 2}]{b1}{b2}
% \connectboxanchors[top] [top] [text={\small\small\strut\bf var 3}]{a1}{b1}
% \connectboxanchors[bottom][bottom][text={\small\small\strut\bf var 4}]{b1}{b2}
% \connectboxanchors[bottom][bottom][text={\small\small\strut\bf var 6}]{a1}{a2}
% \connectboxanchors[bottom][bottom][rulecolor=darkgreen,distance=4ex,text={\small\small\strut\bf var 7}]{c1}{d1}
%
% % \start
%
% $\showboxes
% % \mathboxanchored{a1}{a}^{2^x} +
% % \mathboxanchored[nucleus]{a1}{a}^{2^x} +
% % \mathboxanchored{a1}{g}^2 +
% % \mathboxanchored{a1}{a} +
% a^{\mathboxanchored{a1}{2}} +
% % a^{\mathboxanchored{a1}{2}}_3 +
% \mathboxanchored{b1}{b}
% =
% \mathboxanchored{c1}{c}^2 +
% \mathboxanchored[nucleus]{d1}{d}^2
% =
% b_{\mathboxanchored{b2}{3}} +
% \mathboxanchored{a2}{a}
% $
% \stopbuffer
%
% \starttext
% \startTEXpage[offset=10mm]\startboxanchoring[a]\getbuffer\stopboxanchoring\stopTEXpage
% \startTEXpage[offset=11mm]\startboxanchoring[b]\getbuffer\stopboxanchoring\stopTEXpage
% \startTEXpage[offset=12mm]\startboxanchoring[+]\getbuffer\stopboxanchoring\stopTEXpage
% \stoptext
\protect
|
