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%D \module
%D [ file=mp-grid.mp,
%D version=2000.07.10,
%D title=\CONTEXT\ \METAPOST\ graphics,
%D subtitle=grid support,
%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 licen-en.pdf for
%C details.
%D Under construction.
if unknown context_tool : input mp-tool ; fi ;
if known context_grid : endinput ; fi ;
boolean context_grid ; context_grid := true ;
string fmt_separator ; fmt_separator := "@" ;
numeric fmt_precision ; fmt_precision := 3 ;
boolean fmt_initialize ; fmt_initialize := false ;
boolean fmt_zerocheck ; fmt_zerocheck := true ;
if unknown fmt_loaded : input mp-form ; fi ;
boolean fmt_pictures ; fmt_pictures := true ;
def do_format = if fmt_pictures : format else : formatstr fi enddef ;
def do_mformat = if fmt_pictures : Mformat else : Mformatstr fi enddef ;
numeric grid_eps ; grid_eps = eps ;
def hlingrid (expr Min, Max, Step, Length, Width) text t =
image ( for i=Min step Step until Max+grid_eps :
draw (origin--(Width,0)) shifted (0,i*(Length/Max)) t ;
endfor ; ) ;
enddef ;
def vlingrid (expr Min, Max, Step, Length, Height) text t =
image ( for i=Min step Step until Max+grid_eps :
draw (origin--(0,Height)) shifted (i*(Length/Max),0) t ;
endfor ; ) ;
enddef ;
def hloggrid (expr Min, Max, Step, Length, Width) text t =
image ( for i=max(Min,1) step Step until min(Max,10)+grid_eps :
draw (origin--(Width,0)) shifted (0,Length*log(i)) t ;
endfor ; ) ;
enddef ;
def vloggrid (expr Min, Max, Step, Length, Height) text t =
image ( for i=max(Min,1) step Step until min(Max,10)+grid_eps :
draw (origin--(0,Height)) shifted (Length*log(i),0) t ;
endfor ; ) ;
enddef ;
vardef hlintext@#(expr Min, Max, Step, Length, Format) text t =
image ( do_initialize_numbers ;
for i=Min step Step until Max+grid_eps :
draw textext@#(do_format(Format,i)) shifted (0,i*(Length/Max)) t ;
endfor ; )
enddef ;
vardef vlintext@#(expr Min, Max, Step, Length, Format) text t =
image ( do_initialize_numbers ;
for i=Min step Step until Max+grid_eps :
draw textext@#(do_format(Format,i)) shifted (i*(Length/Max),0) t ;
endfor ; )
enddef ;
vardef hlogtext@#(expr Min, Max, Step, Length, Format) text t =
image ( do_initialize_numbers ;
for i=max(Min,1) step Step until min(Max,10)+grid_eps :
draw textext@#(do_format(Format,i)) shifted (0,Length*log(i)) t ;
endfor ; )
enddef ;
vardef vlogtext@#(expr Min, Max, Step, Length, Format) text t =
image ( do_initialize_numbers ;
for i=max(Min,1) step Step until min(Max,10)+grid_eps :
draw textext@#(do_format(Format,i)) shifted (Length*log(i),0) t ;
endfor ; )
enddef ;
vardef hlinlabel@#(expr Min, Max, Step, Length) text t =
image (
for i=Min step Step until Max+grid_eps :
draw thelabel@#(decimal i,(0,i*(Length/Max))) t ;
endfor ; )
enddef ;
vardef vlinlabel@#(expr Min, Max, Step, Length) text t =
image (
for i=Min step Step until Max+grid_eps :
draw thelabel@#(decimal i,(i*(Length/Max),0)) t ;
endfor ; )
enddef ;
boolean numbers_initialized ; numbers_initialized := false ;
def do_initialize_numbers =
if not numbers_initialized :
init_numbers ( textext.raw("$-$") ,
textext.raw("$1$") ,
textext.raw("${\times}10$") ,
textext.raw("${}^-$") ,
textext.raw("${}^2$") ) ;
numbers_initialized := true ;
fi ;
enddef ;
def initialize_numbers =
numbers_initialized := false ; do_initialize_numbers ;
enddef ;
vardef linlog(expr xy) = ( xpart xy, log(ypart xy)) enddef ;
vardef loglin(expr xy) = (log(xpart xy), ypart xy) enddef ;
vardef loglog(expr xy) = (log(xpart xy), log(ypart xy)) enddef ;
vardef linlin(expr xy) = ( (xpart xy), (ypart xy)) enddef ;
vardef loglinpath primary p = processpath (p) (loglin) enddef ;
vardef linlogpath primary p = processpath (p) (linlog) enddef ;
vardef loglogpath primary p = processpath (p) (loglog) enddef ;
vardef linlinpath primary p = processpath (p) (linlin) enddef ;
def processpath (expr p) (text pp) =
if path p :
for i=0 upto length(p)-1 :
(pp(point i of p)) .. controls
(pp(postcontrol i of p)) and
(pp(precontrol (i+1) of p)) ..
endfor
if cycle p :
cycle
else :
(pp(point length(p) of p))
fi
elseif pair p :
(pp(p))
else :
p
fi
enddef ;
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