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%D \module
%D [ file=pack-pos,
%D version=2010.11.17 % real old code, updated a bit
%D title=\CONTEXT\ Packaging Macros,
%D subtitle=Positioning,
%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 Packaging Macros / Positioning}
\unprotect
% An old but still usefull mechanism:
%
% \ruledvbox{\startpositioning
% \position(1,1){test}
% \position[xstep=relative](1,1){test}
% \position[ystep=relative](3,-1){test}
% \position(10,10){test}
% \stoppositioning}
%
% watch out: rather global
\installcorenamespace {positioning}
\installcommandhandler \??positioning {positioning} \??positioning
\setuppositioning
[\c!state=\v!start,
\c!unit=\s!cm,
\c!factor=\plusone,
\c!scale =\plusone,
\c!xfactor=\positioningparameter\c!factor,
\c!yfactor=\positioningparameter\c!factor,
\c!xscale=\positioningparameter\c!scale,
\c!yscale=\positioningparameter\c!scale,
\c!xstep=\v!absolute,
\c!ystep=\v!absolute,
\c!xoffset=\zeropoint,
\c!yoffset=\zeropoint]
\newdimension\d_pack_positioning_x_position
\newdimension\d_pack_positioning_y_position
\newdimension\d_pack_positioning_x_dimension
\newdimension\d_pack_positioning_y_dimension
\newdimension\d_pack_positioning_x_offset
\newdimension\d_pack_positioning_y_offset
\newbox \b_pack_positioning
\permanent\tolerant\protected\def\startpositioning[#1]#*[#2]%
{\bgroup
\ifparameters
\lettonothing\currentpositioning
\or
\ifhastok={#1}%
\lettonothing\currentpositioning
\setupcurrentpositioning[#1]%
\else
\edef\currentpositioning{#1}%
\fi
\or
\edef\currentpositioning{#1}%
\setupcurrentpositioning[#2]%
\fi
\d_pack_positioning_x_position \zeropoint
\d_pack_positioning_y_position \zeropoint
\d_pack_positioning_x_dimension\zeropoint
\d_pack_positioning_y_dimension\zeropoint
\d_pack_positioning_x_offset \zeropoint
\d_pack_positioning_y_offset \zeropoint
\hfuzz\paperwidth
\vfuzz\paperheight
\setbox\b_pack_positioning\hbox\bgroup
\ignorespaces}
\permanent\protected\def\stoppositioning
{\removeunwantedspaces
\doifnot{\positioningparameter\c!offset}\v!yes
{\global\d_pack_positioning_x_offset\zeropoint
\global\d_pack_positioning_y_offset\zeropoint}%
\global\advanceby\d_pack_positioning_x_dimension\d_pack_positioning_x_offset
\global\advanceby\d_pack_positioning_y_dimension\d_pack_positioning_y_offset
\egroup
\vbox to \d_pack_positioning_y_dimension
{\vskip\d_pack_positioning_y_offset
\hbox to \d_pack_positioning_x_dimension
{\kern\d_pack_positioning_x_offset
\box\b_pack_positioning
\hfill}
\vfill}%
\egroup}
\protected\def\pack_positioning_calculate#1#2#3#4#5#6#7#8#9%
{\setdimensionwithunit\scratchdimen{#1}{\positioningparameter\c!unit}%
\scratchdimen\positioningparameter#8\scratchdimen
\scratchdimen\positioningparameter#9\scratchdimen
\advanceby\scratchdimen\positioningparameter#4\relax
% == \scratchdimen\dimexpr#8\dimexpr#9\scratchdimen\relax+#4\relax
\doif{\positioningparameter#2}\v!relative
{\advanceby\scratchdimen#3%
\letpositioningparameter#4\zeropoint}%
#3\scratchdimen
\doifnot{\positioningparameter\c!state}\v!overlay
{\scratchdimen\dimexpr#5\nextbox+#3\relax
\ifdim #3<-#7\relax \global#7-#3\relax \fi
\ifdim\scratchdimen> #6\relax \global#6\scratchdimen\fi}}
\permanent\tolerant\protected\def\position[#1]#:(#2,#3)%
{\bgroup
\ifparameter#1\or
\setupcurrentpositioning[#1]%
\fi
\removeunwantedspaces
\dowithnextbox{\pack_positioning_position_indeed{#2}{#3}}\hbox}
\def\pack_positioning_position_indeed#1#2%
{\dontcomplain
\pack_positioning_calculate
{#1}%
\c!xstep
\d_pack_positioning_x_position
\c!xoffset
\wd
\d_pack_positioning_x_dimension
\d_pack_positioning_x_offset
\c!xscale
\c!xfactor
\pack_positioning_calculate
{#2}%
\c!ystep
\d_pack_positioning_y_position
\c!yoffset
\htdp
\d_pack_positioning_y_dimension
\d_pack_positioning_y_offset
\c!yscale
\c!yfactor
\vbox to \zeropoint
{\offinterlineskip % else we get an empty line
\vskip\d_pack_positioning_y_position
\hbox to \zeropoint
{\kern\d_pack_positioning_x_position
\box\nextbox
\hss}
\vss}%
\normalexpanded
{\egroup
\d_pack_positioning_x_position\the\d_pack_positioning_x_position
\d_pack_positioning_y_position\the\d_pack_positioning_y_position
\setexpandedpositioningparameter\c!xoffset{\the\dimexpr\positioningparameter\c!xoffset}%
\setexpandedpositioningparameter\c!yoffset{\the\dimexpr\positioningparameter\c!yoffset}}%
\ignorespaces}
\protect \endinput
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