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%D \module
%D [ file=meta-grd,
%D version=2012.06.28,
%D title=\METAPOST\ Graphics,
%D subtitle=grids,
%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}{MetaPost Graphics / Grids}
%D This used to be a \TEX\ method, and a rather old one too. We keep it around but
%D in a more modern way.
%D
%D \startbuffer
%D \basegrid
%D [nx=8,ny=5,
%D dx=.5,dy=.25,
%D unit=cm,scale=2,factor=1,
%D offset=1ex,xstep=2,ystep=1,
%D align=middle,style=\tt\tx]
%D \stopbuffer
%D
%D \typebuffer
%D
%D \placefigure
%D {An example of a grid.}
%D {\getbuffer}
\startuseMPgraphic{grid}{nx,ny,dx,dy,factor,scale,xstep,ystep,xoffset,yoffset,align}
begingroup ;
save nx, ny, dx, dy, wd, ht, xstep, ystep, xoffset, yoffset, align, xalign, yalign ;
numeric nx ; nx := \MPvar{nx} ;
numeric ny ; ny := \MPvar{ny} ;
numeric dx ; dx := \MPvar{factor} * \MPvar{scale} * \MPvar{dx} ;
numeric dy ; dy := \MPvar{factor} * \MPvar{scale} * \MPvar{dy} ;
numeric wd ; wd := nx * dx ;
numeric ht ; ht := ny * dy ;
numeric xstep ; xstep := \MPvar{xstep} ;
numeric ystep ; ystep := \MPvar{ystep} ;
numeric xoffset ; xoffset := \MPvar{xoffset} ;
numeric yoffset ; yoffset := \MPvar{yoffset} ;
numeric align ; align := \MPvar{align} ;
numeric xalign ; xalign := 0 ;
numeric yalign ; yalign := 0 ;
if align = 1 :
xalign := dx/2 ;
yalign := dy/2 ;
fi ;
for i=0 step dx until wd :
draw (i,0) -- (i,ht) ;
endfor ;
for i=0 step dy until ht :
draw (0,i) -- (wd,i) ;
endfor ;
if xstep > 0 :
for i=1 step xstep until nx :
draw thetextext.bot(decimal i,(i*dx-xalign,-xoffset)) ;
endfor ;
fi ;
if ystep > 0 :
for i=1 step ystep until ny :
draw thetextext.lft(decimal i,(-yoffset,i*dy-yalign)) ;
endfor ;
fi ;
endgroup ;
\stopuseMPgraphic
\unprotect
\unexpanded\def\basegrid
{\dosingleempty\typo_grid_base}
\def\typo_grid_base[#1]%
{\hbox\bgroup
\getdummyparameters
[\c!nx=10,\c!ny=10,\c!dx=.5,\c!dy=.5,\c!xstep=0,\c!ystep=0,%
\c!unit=\s!cm,\c!scale=1,\c!factor=1,%
\c!offset=.25ex,\c!xoffset=\directdummyparameter\c!offset,\c!yoffset=\directdummyparameter\c!offset,%
\c!align=,
#1]%
\usedummystyleandcolor\c!style\c!color
\edef\p_align{\directdummyparameter\c!align}%
\ifx\p_align\v!middle
\let\p_align\!!plusone
\else
\let\p_align\!!zerocount
\fi
\useMPgraphic
{grid}%
{nx=\directdummyparameter\c!nx,%
ny=\directdummyparameter\c!ny,%
dx=\directdummyparameter\c!dx\directdummyparameter\c!unit,%
dy=\directdummyparameter\c!dy\directdummyparameter\c!unit,%
factor=\directdummyparameter\c!factor,%
scale=\directdummyparameter\c!scale,%
xstep=\directdummyparameter\c!xstep,%
ystep=\directdummyparameter\c!ystep,%
xoffset=\directdummyparameter\c!xoffset,%
yoffset=\directdummyparameter\c!yoffset,%
align=\p_align}%
\egroup}
\let\grid\basegrid
\protect \endinput
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