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%D \module
%D [ file=anch-snc,
%D version=2003.12.01, % actually 1999 so real old
%D title=\CONTEXT\ Anchoring Macros,
%D subtitle=Synchronization,
%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.
%D The original is in the mkii file. It does more at the \TEX\ end and
%D has some more magic. If we really need that I'll add it. After all,
%D in mkiv we can do things different.
%D TODO: bleed : + left , minus right oro check if it touches page ... autobleed
\writestatus{loading}{ConTeXt Anchoring Macros / Synchronization}
\registerctxluafile{anch-snc}{}
\unprotect
\ifx\??syncposcounter\undefined \installcorenamespace{syncposcounter} \fi
\ifx\s!syncpos \undefined \def\s!syncpos {syncpos} \fi
\let\c_sync_n\relax
\unexpanded\def\definesyncpositions[#1]%
{\ifcsname\??syncposcounter:#1\endcsname \else
\expandafter\newcount\csname\??syncposcounter:#1\endcsname
\fi}
\unexpanded\def\syncposition
{\dodoubleempty\anch_sync_position}
\def\anch_sync_position[#1][#2]% we could actually use par positions
{\dontleavehmode
\ifcsname\??syncposcounter:#1\endcsname
\let\c_sync_n\lastnamedcs
\global\advance\c_sync_n\plusone
\enabletextarearegistration
\setpositionplus{\s!syncpos:#1:\the\c_sync_n}{#2}\hpack{\strut}%
\else
\strut
\fi
\ignorespaces}
\protect
\continueifinputfile{anch-snc.mkiv}
\starttext
% \setuppapersize[A4][A3]
\setuplayout[location=middle]
\setupbodyfont[dejavu]
\definesyncpositions[1]
\definesyncpositions[2]
% \enabletrackers[metapost.lua]
\startMPdefinitions
input "mp-asnc.mpiv" ;
SetSyncColor(1,0,"magenta") ;
SetSyncColor(1,1,"red") ;
SetSyncColor(1,2,"green") ;
SetSyncColor(1,3,"blue") ;
SetSyncColor(1,4,"yellow") ;
SetSyncColor(2,0,"magenta") ;
SetSyncColor(2,1,"red") ;
SetSyncColor(2,2,"green") ;
SetSyncColor(2,3,"blue") ;
SetSyncColor(2,4,"yellow") ;
\stopMPdefinitions
\startuseMPgraphic{sync1}
StartPage ;
StartSync(1) ;
SyncHOffset := 0 ;
SyncWidth := BackSpace - LeftMarginDistance;
CollectSyncDataPage ;
% ExtendSyncPaths ; % to top of text area
PruneSyncPaths ; % clip top / bottom
CollapseSyncPaths ;
MakeSyncPaths ;
% DrawSyncPaths ;
FillSyncPaths ;
StopSync ;
clip currentpicture to Page ;
setbounds currentpicture to Page ;
StopPage ;
\stopuseMPgraphic
\startuseMPgraphic{sync2}
StartSync(2) ;
SyncHOffset := -1cm ;
SyncWidth := 1cm ;
CollectSyncDataRegion(OverlayRegion) ;
ExtendSyncPaths ; % to top of text area
MakeSyncPaths ;
FillSyncPaths ;
StopSync ;
clip currentpicture to OverlayBox leftenlarged 1cm;
setbounds currentpicture to OverlayBox ;
\stopuseMPgraphic
\defineoverlay[tempoverlay1][\useMPgraphic{sync1}]
\defineoverlay[tempoverlay2][\useMPgraphic{sync2}]
\setupbackgrounds[page][background=tempoverlay1]
\framed[region=yes,background=tempoverlay2,width=14cm,align=normal]{
\syncposition[2][1]\samplefile{ward}\endgraf
\syncposition[2][2]\samplefile{ward}\endgraf
\syncposition[2][3]\samplefile{ward}\endgraf
}
\vskip1cm \hskip1cm \framed[region=yes,background=tempoverlay2,width=16cm,align=normal]{
\syncposition[2][1]\samplefile{ward}\endgraf
\syncposition[2][2]\samplefile{ward}\endgraf
\syncposition[2][3]\samplefile{ward}\endgraf
}
\vskip1cm \hskip1cm \framed[region=yes,background=tempoverlay2,width=10cm,align=normal]{
\syncposition[2][1]\samplefile{ward}\endgraf
\syncposition[2][2]\samplefile{ward}\endgraf
\syncposition[2][3]\samplefile{ward}\endgraf
}
\dorecurse {100} {
% \dorecurse {1} {
\startchapter[title={Test #1}]
\syncposition[1][1,reset]\dorecurse{20}{\samplefile{ward}\endgraf}
\syncposition[1][2]\dorecurse {4}{\samplefile{ward}\endgraf}
\syncposition[1][3]\dorecurse {7}{\samplefile{ward}\endgraf}
\syncposition[1][4]\dorecurse {3}{\samplefile{ward}\endgraf}
\stopchapter
}
\dorecurse {100} {
% \dorecurse {1} {
\startchapter[title={Test #1}]
\syncposition[1][1]\dorecurse{1}{\samplefile{ward}\endgraf}
\syncposition[1][2]\dorecurse{1}{\samplefile{ward}\endgraf}
\syncposition[1][3]\dorecurse{1}{\samplefile{ward}\endgraf}
\syncposition[1][4]\dorecurse{1}{\samplefile{ward}\endgraf}
\stopchapter
}
\stoptext
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