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%D \module
%D [ file=meta-ini,
%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
\appendtoks
if unknown context_page : input mp-page ; fi ;
\to \MPinitializations
%D The next few macros tell \METAPOST\ how the \CONTEXT\
%D pagebody looks.
\startuseMPgraphic{page data}
boolean PageStateAvailable ; PageStateAvailable := true ;
boolean OnRightPage ; OnRightPage := true ;
def LoadPageState =
OnRightPage := \MPonrightpage ;
PageNumber := \realfolio ;
PaperHeight := \the\papierhoogte ;
PaperWidth := \the\papierbreedte ;
PrintPaperHeight := \the\printpapierhoogte ;
PrintPaperWidth := \the\printpapierbreedte ;
TopSpace := \the\kopwit ;
BackSpace := \the\rugwit ;
MakeupHeight := \the\zethoogte ;
MakeupWidth := \the\zetbreedte ;
TopHeight := \the\bovenhoogte ;
TopDistance := \@the\bovenafstand ;
HeaderHeight := \the\hoofdhoogte ;
HeaderDistance := \@the\hoofdafstand ;
TextHeight := \the\teksthoogte ;
FooterDistance := \@the\voetafstand ;
FooterHeight := \the\voethoogte ;
BottomDistance := \@the\onderafstand ;
BottomHeight := \the\onderhoogte ;
LeftEdgeWidth := \the\linkerrandbreedte ;
LeftEdgeDistance := \@the\linkerrandafstand ;
LeftMarginWidth := \the\linkermargebreedte ;
LeftMarginDistance := \@the\linkermargeafstand ;
TextWidth := \the\tekstbreedte ;
RightMarginDistance := \@the\rechtermargeafstand ;
RightMarginWidth := \the\rechtermargebreedte ;
RightEdgeDistance := \@the\rechterrandafstand ;
RightEdgeWidth := \the\rechterrandbreedte ;
PageOffset := \MPpageoffset ;
PageDepth := \MPpagedepth ;
enddef ;
\stopuseMPgraphic
\def\MPonrightpage{true}
\let\MPpageoffset \!!zeropoint
\let\MPpagedepth \!!zeropoint
\def\freezeMPpagelayout%
{\doifelsevalue{\??ma\v!pagina\c!offset}{\v!overlay}
{\let\MPpageoffset\!!zeropoint}
{\edef\MPpageoffset{\getvalue{\??ma\v!pagina\c!offset}}}%
\edef\MPpagedepth{\getvalue{\??ma\v!pagina\c!diepte}}%
\freezedimenmacro\MPpageoffset
\freezedimenmacro\MPpagedepth
\doifbothsides
\def\MPonrightpage{true}%
\orsideone
\def\MPonrightpage{true}%
\orsidetwo
\def\MPonrightpage{false}%
\od}
\iffixedlayoutdimensions
\let\freezeMPlayout\relax
\else
\def\freezeMPlayout% must be done more efficient
{\freezedimenmacro\bovenafstand
\freezedimenmacro\hoofdafstand
\freezedimenmacro\voetafstand
\freezedimenmacro\onderafstand
\freezedimenmacro\linkerrandafstand
\freezedimenmacro\linkermargeafstand
\freezedimenmacro\rechtermargeafstand
\freezedimenmacro\rechterrandafstand}
\fi
%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 \everypagebody
%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
\freezeMPlayout % to be used grouped
\to \everyMPgraphic
\appendtoks
\includeMPgraphic{page data}
\to \MPinitializations
\protect \endinput
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