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%D \module
%D [ file=m-graph,
%D version=2000.08.06,
%D title=\CONTEXT\ Extra Modules,
%D subtitle=\METAPOST\ graph module 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 mreadme.pdf for
%C details.
\loadmarkfile{m-graph}
\doifnotmode {demo} {\endinput}
%D You need to have the data files in your path,
%D otherwise the run is aborted.
\doiffileelse {agepop91.d} {} {\writestatus{graph}{no data files found}\wait\end}
%D The test:
\starttext
\startMPpage
draw begingraph(3in,2in);
gdraw "agepop91.d";
endgraph;
\stopMPpage
\startMPpage
draw begingraph(3in,2in);
gdraw "agepop91.d" plot btex$\bullet$etex;
endgraph;
\stopMPpage
\startMPpage
draw begingraph(3in,2in);
glabel.lft(btex \vbox{\hbox{Population} \hbox{in millions}} etex, OUT);
glabel.bot(btex Age in years etex, OUT);
gdraw "agepopm.d";
endgraph;
\stopMPpage
\startMPpage
draw begingraph(3in,2in);
glabel.lft(btex \vbox{\hbox{Population} \hbox{in millions}} etex, OUT);
glabel.bot(btex Age in years etex, OUT);
setrange(origin, whatever,whatever);
gdraw "agepopm.d";
endgraph;
\stopMPpage
\startMPpage
draw begingraph(2.3in,2in);
setcoords(log,log);
glabel.lft(btex Seconds etex,OUT);
glabel.bot(btex Matrix size etex,
OUT);
gdraw "matmul.d" dashed evenly;
glabel.ulft(btex Standard etex,8);
gdraw "matmul.d";
glabel.lrt(btex Strassen etex,7);
endgraph;
\stopMPpage
\startMPpage
draw begingraph(6.5cm,4.5cm);
setrange(80,0, 90,whatever);
glabel.bot(btex Year etex, OUT);
glabel.lft(btex \vbox{\hbox{Emissions in} \hbox{thousands of}
\hbox{metric tons} \hbox{(heavy line)}}etex, OUT);
gdraw "lead.d" withpen pencircle scaled 1.5pt;
autogrid(,otick.lft);
setcoords(linear,linear);
setrange(80,0, 90,whatever);
glabel.rt(btex \vbox{\hbox{Micrograms} \hbox{per cubic}
\hbox{meter of air} \hbox{(thin line)}}etex, OUT);
gdraw "lead.d";
autogrid(otick.bot,otick.rt);
endgraph;
\stopMPpage
\stoptext
% No longer needed, since John will fix it.
%
% %D For the moment we need the following patch. Adam T. Lindsay
% %D found out that the following code produced an error:
% %D
% %D \starttyping
% %D \startMPcode
% %D draw begingraph(130mm,35mm);
% %D setrange(0,0,10,22000);
% %D glabel.lft(btex {correct 0--22000} etex rotated 90, OUT);
% %D autogrid(itick.bot,grid.lft) withcolor .75white ;
% %D endgraph;
% %D \stopMPcode
% %D
% %D \startMPcode
% %D draw begingraph(130mm,35mm);
% %D setrange(0,50,10,22000);
% %D glabel.lft(btex {wrong 50--22000} etex rotated 90, OUT);
% %D autogrid(itick.bot,grid.lft) withcolor .75white ;
% %D endgraph;
% %D \stopMPcode
% %D
% %D \startMPcode
% %D draw begingraph(130mm,35mm);
% %D setrange(0,110,10,30000);
% %D glabel.lft(btex {failed 110--22000} etex rotated 90, OUT);
% %D autogrid(itick.bot,grid.lft) withcolor .75white ;
% %D endgraph;
% %D \stopMPcode
% %D \stoptyping
% %D
% %D The bug is a rather nasty one and needs some tweaking in
% %D the low level graph code. John Hobby suggested for the
% %D moment to initialize \type {setrange} as follows:
% %D
% %D \starttyping
% %D setrange(0,0,"22000","22000")
% %D \stoptyping
% %D
% %D Folowing this suggesion, I provide the following
% %D extension:
% def begingraph(expr w, h) =
% begingroup
% save X_, Y_, Gfin_, Gcur_, Gcbb_, Gneedgr_, Gneedfr_, Gdidsc_;
% save Gdpic_, Gppic_, Ggl_, Garw_;
% picture Gfin_, Gcur_, Gcbb_, Gdpic_, Gppic_, Ggl_[];
% boolean Gneedgr_, Gneedfr_, Gdidsc_;
% Gfin_ = nullpicture;
% Gcur_ = nullpicture;
% Gcbb_ = nullpicture;
% X_.ctyp = Y_.ctyp = linear;
% Z_.gdim = (w,h);
% X_.sc = Y_.sc = 0;
% Gneedgr_ = true;
% Gneedfr_ = true;
% Gdidsc_ = false;
% Gdpic_ = nullpicture;
% Garw_ = 0;
% scantokens everybegingraph ;
% enddef;
%
% boolean fixsetrange ; fixsetrange := true ;
%
% vardef dosetrange(text t) =
% interim warningcheck:=0;
% save r_; r_=0;
% string r_[]s;
% for x_=
% for p_=t: if pair p_: xpart p_, ypart fi p_, endfor:
% r_[incr r_] if string x_: s fi = x_;
% if r_>2:
% Gsetr_ if r_=3: X_(Gxcvlin_) else: Y_(Gycvlin_) fi(
% r_[r_-2] if unknown r_[r_-2]: s fi, x_);
% fi
% exitif r_=4;
% endfor
% enddef;
%
% vardef setrange(text t) =
% if fixsetrange : dosetrange(0,0,20000,20000) ; fi ;
% dosetrange(t) ;
% enddef ;
%
% if unknown everybegingraph :
% string everybegingraph ;
% % everybegingraph := "setrange(0,0,20000,20000)" ;
% fi ;
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