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%D \module
%D [ file=meta-pag,
%D version=1999.07.10,
%D title=\METAPOST\ Graphics,
%D subtitle=Initialization,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%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 These definitions used to be part of the old \type
%D {core-mps} file, later changed into \type {meta-ini}, but
%D keeping them separate is cleaner.
\writestatus{loading}{MetaPost Graphics / Page Data Management}
\unprotect
\startMPextensions
if unknown context_page: input mp-page; fi;
\stopMPextensions
%D The next few macros tell \METAPOST\ how the \CONTEXT\
%D pagebody looks.
\startMPextensions
boolean PageStateAvailable,OnRightPage,InPageBody;
PageStateAvailable:=true;
\stopMPextensions
\startMPinitializations
OnRightPage:=true;
InPageBody:=\ifinpagebody true \else false \fi;
\stopMPinitializations
\startMPinitializations
def LoadPageState =
OnRightPage:=\MPonrightpage;
OnOddPage:=\MPonoddpage;
RealPageNumber:=\the\realpageno;
PageNumber:=\the\pageno;
NOfPages:=\lastpage;
PaperHeight:=\the\paperheight;
PaperWidth:=\the\paperwidth;
PrintPaperHeight:=\the\printpaperheight;
PrintPaperWidth:=\the\printpaperwidth;
TopSpace:=\the\topspace;
BottomSpace:=\the\bottomspace;
BackSpace:=\the\backspace;
CutSpace:=\the\cutspace;
MakeupHeight:=\the\makeupheight;
MakeupWidth:=\the\makeupwidth;
TopHeight:=\the\topheight;
TopDistance:=\the\topdistance;
HeaderHeight:=\the\headerheight;
HeaderDistance:=\the\headerdistance;
TextHeight:=\the\textheight;
FooterDistance:=\the\footerdistance;
FooterHeight:=\the\footerheight;
BottomDistance:=\the\bottomdistance;
BottomHeight:=\the\bottomheight;
LeftEdgeWidth:=\the\leftedgewidth;
LeftEdgeDistance:=\the\leftedgedistance;
LeftMarginWidth:=\the\leftmarginwidth;
LeftMarginDistance:=\the\leftmargindistance;
TextWidth:=\the\textwidth ;
RightMarginDistance:=\the\rightmargindistance;
RightMarginWidth:=\the\rightmarginwidth;
RightEdgeDistance:=\the\rightedgedistance;
RightEdgeWidth:=\the\rightedgewidth;
InnerMarginDistance:=\the\innermargindistance;
InnerMarginWidth:=\the\innermarginwidth;
OuterMarginDistance:=\the\outermargindistance;
OuterMarginWidth:=\the\outermarginwidth;
InnerEdgeDistance:=\the\inneredgedistance;
InnerEdgeWidth:=\the\inneredgewidth;
OuterEdgeDistance:=\the\outeredgedistance;
OuterEdgeWidth:=\the\outeredgewidth;
PageOffset:=\the\pageoffset;
PageDepth:=\the\pagedepth;
LayoutColumns:=\the\layoutcolumns;
LayoutColumnDistance:=\the\layoutcolumndistance;
LayoutColumnWidth:=\the\layoutcolumnwidth;
enddef;
\stopMPinitializations
\def\MPonrightpage{true}
\def\MPonoddpage {true}
\def\freezeMPpagelayout
{\edef\MPonrightpage{\doifbothsides {tru}{tru}{fals}e}%
\edef\MPonoddpage {\doifoddpageelse {tru}{fals}e}}
\let\freezeMPlayout\relax % obsolete
%D We need to freeze the pagelayout before the backgrounds
%D are build, because the overlay will temporarily become
%D zero (overlay).
\appendtoks
\freezeMPpagelayout
\to \everybeforepagebody
%D By freezing these value every graphic, we can use layout
%D variables that change halfways a page, whatever use that
%D has.
\prependtoks
\calculatereducedvsizes % this is really needed
\freezeMPpagelayout
\freezeMPlayout % to be used grouped
\to \everyMPgraphic
%D The next feature provides information about for instance
%D column positions. This is an experimental feature,
%D introduced when we needed backgrounds in columns (fill||in
%D questions as implemented in a private module).
%D
%D See \type {mp-page.mp} for the definition of the macros:
%D
%D \starttabulate[|tl|l|p|]
%D \NC ResetTextAreas \NC no arguments \NC
%D reset areas on page \NC \NR
%D \NC RegisterTextArea \NC x, y, w, h \NC
%D adds area to the list \NC \NR
%D \NC TextAreaX,Y,W,H,XY,WH \NC x and/or y \NC
%D reports offsets and dimensions \NC \NR
%D \stoptabulate
%D
%D The \type {TextArea*} macros can be used to determine
%D overlap.
\newcount\currentMPtextareadata
\newtoks\MPsavedtextareadata
\newtoks\MPtextareadata
\newtoks\MPlocaltextareadata
% optimaliseren voor herhaling
\def\registerMPtextarea#1%
{\ifpositioning
\bgroup
\global\advance\currentMPtextareadata\plusone
%\hpos{gbd:\the\currentMPtextareadata}{#1}%
\hpos{gbd:\the\currentMPtextareadata}%
{\iftracetextareas\boxrulewidth1.5pt\ruledhbox\fi{#1}}%
\edef\!!stringa{gbd:\the\currentMPtextareadata}%
\edef\!!stringa{RegisterTextArea(%
\MPx\!!stringa,\MPy\!!stringa,%
\MPw\!!stringa,\MPh\!!stringa,\MPd\!!stringa);}%
\@EA \doglobal \@EA \appendtoks \!!stringa \to \MPtextareadata
\egroup
\else
\hbox{#1}%
\fi}
\def\registerMPlocaltextarea#1%
{\ifpositioning
\bgroup
\global\advance\currentMPtextareadata\plusone
%\hpos{gbd:\the\currentMPtextareadata}{#1}%
\hpos{gbd:\the\currentMPtextareadata}%
{\iftracetextareas\boxrulewidth3pt\ruledhbox\fi{#1}}%
\edef\!!stringa{gbd:\the\currentMPtextareadata}%
\edef\!!stringa{RegisterLocalTextArea(%
\MPx\!!stringa,\MPy\!!stringa,%
\MPw\!!stringa,\MPh\!!stringa,\MPd\!!stringa);}%
\global\MPlocaltextareadata\@EA{\!!stringa}%
\egroup
\else
\hbox{#1}%
\fi}
% better, so that we can force a key and share with e.g. renumbering
%
% \let\namedtextarea\empty
%
% \def\registerMPlocaltextarea#1%
% {\ifpositioning
% \bgroup
% \ifx\namedtextarea\empty
% \global\advance\currentMPtextareadata\plusone
% \edef\namedtextarea{gbd:\the\currentMPtextareadata}%
% \fi
% \hpos\namedtextarea{\iftracetextareas\boxrulewidth3pt\ruledhbox\fi{#1}}%
% \edef\ascii{RegisterLocalTextArea(%
% \MPx\namedtextarea,\MPy\namedtextarea,%
% \MPw\namedtextarea,\MPh\namedtextarea,\MPd\namedtextarea);}%
% \global\MPlocaltextareadata\@EA{\ascii}%
% \egroup
% \else
% \hbox{#1}%
% \fi}
\def\resetMPlocaltextarea
{\global\MPlocaltextareadata\emptytoks}
\startMPextensions
path PlainTextArea;
\stopMPextensions
\startMPinitializations
ResetTextAreas;
\the\MPsavedtextareadata;
SaveTextAreas;
ResetTextAreas;
\the\MPtextareadata;
\the\MPlocaltextareadata;
PlainTextArea:=boundingbox(\MPxy{text:\realfolio}--\MPxy{text:\realfolio}
shifted (\MPw{text:\realfolio},\MPh{text:\realfolio}));
\stopMPinitializations
\appendtoks
\global\MPsavedtextareadata\MPtextareadata
\global\MPtextareadata \emptytoks
\global\MPlocaltextareadata\emptytoks
\to \everyshipout
\protect \endinput
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