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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}
\unprotect
%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,s:textcolor,s:rulecolor,rulethickness}
% begingroup ;
% save dx, dy, wd, ht, ox, oy, ax, ay ;
%
% (dx,dy) = (\MPvar{dx},\MPvar{dy})*\MPvar{factor}*\MPvar{scale} ;
% (wd,ht) = (\MPvar{nx}*dx,\MPvar{ny}*dy) ;
% (ox,oy) = (\MPvar{xoffset},\MPvar{yoffset}) ;
% (ax,ay) = if \MPvar{align} = 1 : (dx,dy)/2 else : origin fi ;
%
% draw image (
% 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 ;
% )
% withpen pencircle scaled \MPvar{rulethickness}
% withcolor "\MPvar{rulecolor}" ;
% draw image (
% if \MPvar{xstep} > 0 :
% for i=1 step \MPvar{xstep} until \MPvar{nx} :
% draw thetextext.bot(decimal i,(i*dx-ax,-ox));
% endfor ;
% fi ;
% if \MPvar{ystep} > 0 :
% for i=1 step \MPvar{ystep} until \MPvar{ny} :
% draw thetextext.lft(decimal i,(-oy,i*dy-ay)) ;
% endfor ;
% fi ;
% )
% withcolor "\MPvar{color}" ;
% endgroup ;
% \stopuseMPgraphic
%
% less tokens (not used often):
%
% \startuseMPgraphic{grid}{\c!nx,\c!ny,\c!dx,\c!dy,\c!factor,\c!scale,\c!xstep,\c!ystep,\c!xoffset,\c!yoffset,\c!align,s:\c!textcolor,s:\c!rulecolor,\c!rulethickness}
% begingroup ;
% save dx, dy, wd, ht, ox, oy, ax, ay ;
%
% (dx,dy) = (\MPvar\c!dx,\MPvar\c!dy)*\MPvar\c!factor*\MPvar\c!scale ;
% (wd,ht) = (\MPvar\c!nx*dx,\MPvar\c!ny*dy) ;
% (ox,oy) = (\MPvar\c!xoffset,\MPvar\c!yoffset) ;
% (ax,ay) = if \MPvar\c!align = 1 : (\c!dx,\c!dy)/2 else : origin fi ;
%
% draw image (
% 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 ;
% )
% withpen pencircle scaled \MPvar\c!rulethickness\space
% withcolor "\MPvar\c!rulecolor" ;
% draw image (
% if \MPvar\c!xstep > 0 :
% for i=1 step \MPvar\c!xstep until \MPvar\c!nx :
% draw thetextext.bot(decimal i,(i*dx-ax,-ox));
% endfor ;
% fi ;
% if \MPvar\c!ystep > 0 :
% for i=1 step \MPvar\c!ystep until \MPvar\c!ny :
% draw thetextext.lft(decimal i,(-oy,i*dy-ay)) ;
% endfor ;
% fi ;
% )
% withcolor "\MPvar\c!color" ;
% endgroup ;
% \stopuseMPgraphic
%
% \def\typo_grid_base[#1]%
% {\dontleavehmode
% \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=,%
% \c!color=\currentcolorname,%
% \c!rulecolor=\currentcolorname,%
% \c!rulethickness=\linewidth,%
% #1]%
% \usedummystyleandcolor\c!style\c!color
% \edef\p_align{\directdummyparameter\c!align}%
% \edef\p_unit {\directdummyparameter\c!unit}%
% \useMPgraphic
% {grid}%
% {nx=\directdummyparameter\c!nx,%
% ny=\directdummyparameter\c!ny,%
% dx=\directdummyparameter\c!dx\p_unit,%
% dy=\directdummyparameter\c!dy\p_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,%
% color=\directdummyparameter\c!color,%
% rulecolor=\directdummyparameter\c!rulecolor,%
% rulethickness=\directdummyparameter\c!rulethickness,%
% align=\ifx\p_align\v!middle\!!plusone\else\!!zerocount\fi}%
% \egroup}
%
% even less tokens wasted (no need to clog the core with hardly
% used code):
\startuseMPgraphic{meta:grd:basegrid}
begingroup ;
save sc, dx, dy, wd, ht, ox, oy, ax, ay ;
sc = \directdummyparameter\c!factor*\directdummyparameter\c!scale ;
dx = \MPdpar\directdummyparameter\c!dx*sc ;
dy = \MPdpar\directdummyparameter\c!dy*sc ;
wd = \directdummyparameter\c!nx*dx ;
ht = \directdummyparameter\c!ny*dy ;
ox = \MPdpar\directdummyparameter\c!xoffset\relax ;
oy = \MPdpar\directdummyparameter\c!yoffset\relax ;
if "\directdummyparameter\c!align" = "\v!middle" :
ax = \MPdpar\directdummyparameter\c!dx/2
ay = \MPdpar\directdummyparameter\c!dy/2
else :
ax = 0 ;
ay = 0 ;
fi ;
draw image (
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 ;
)
withpen pencircle scaled \MPdpar\directdummyparameter\c!rulethickness\space
withcolor "\directdummyparameter\c!rulecolor" ;
draw image (
if \directdummyparameter\c!xstep > 0 :
for i=1 step \directdummyparameter\c!xstep until \directdummyparameter\c!nx :
draw thetextext.bot(decimal i,(i*dx-ax,oy));
endfor ;
fi ;
if \directdummyparameter\c!ystep > 0 :
for i=1 step \directdummyparameter\c!ystep until \directdummyparameter\c!ny :
draw thetextext.lft(decimal i,(ox,i*dy-ay)) ;
endfor ;
fi ;
)
withcolor "\directdummyparameter\c!color" ;
endgroup ;
\stopuseMPgraphic
\def\typo_grid_base[#1]%
{\dontleavehmode
\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=.25\exheight,%
\c!xoffset=\directdummyparameter\c!offset,%
\c!yoffset=\directdummyparameter\c!offset,%
\c!align=,%
\c!color=\currentcolorname,%
\c!rulecolor=\currentcolorname,%
\c!rulethickness=\linewidth,%
#1]%
\usedummystyleandcolor\c!style\c!color
\setexpandeddummyparameter\c!dx{\directdummyparameter\c!dx\directdummyparameter\c!unit}%
\setexpandeddummyparameter\c!dy{\directdummyparameter\c!dy\directdummyparameter\c!unit}%
\useMPgraphic{meta:grd:basegrid}%
\egroup}
\unexpanded\def\basegrid
{\dosingleempty\typo_grid_base}
\let\grid\basegrid
\protect \endinput
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