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%D \module
%D [ file=meta-txt,
%D version=2000.07.06,
%D title=\METAPOST\ Graphics,
%D subtitle=Text Tricks,
%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.
%D In this library some handy text manipulations are
%D defined. Some can and will be improved as soon as the
%D \TEX||\METAPOST\ interface is stable. Some of the
%D solutions may look weird, which is entirely my fault,
%D since I implemented them in the process of getting grip
%D on this kind of manipulations. Undoubtly better
%D \METAPOST\ code is possible, but my way of learning
%D this kind of trickery happens to be by \quote {trial
%D and error} and \quote {look and feel} (as well as
%D identifying tricks in Hobby's code).
% textext ipv btex ... etex
% we need a proper prefix here
\unprotect
\startMPextensions
if unknown context_text: input mp-text; fi;
\stopMPextensions
%%%%%%%
% \def\newchar#1{\chardef#1=0 }
\ifdefined\MPtoks \else \newtoks\MPtoks \fi
\ifdefined\MPbox \else \newbox \MPbox \fi
\ifdefined\parwidth \else \newdimen\parwidth \fi
\ifdefined\parheight \else \newdimen\parheight \fi
\ifdefined\parvoffset \else \newdimen\parvoffset \fi
\ifdefined\parhoffset \else \newdimen\parhoffset \fi
\ifdefined\parlines \else \newcount\parlines \fi
\ifdefined\partoks \else \newtoks \partoks \fi
\ifdefined\shapetextbox \else \newbox \shapetextbox \fi
\newif \ifparseries
\ifdefined\parfirst \else \chardef \parfirst=0 \fi
\def\startshapetext[#1]%
{\global\newcounter\currentshapetext
\global\setbox\shapetextbox\vbox\bgroup
\expanded{\switchtobodyfont[\@@shbodyfont]}%
\dontcomplain
\hsize\parwidth
\setuptolerance[\v!verytolerant,\v!stretch]%
\!!counta\zerocount
\!!toksa\emptytoks
\def\docommand##1%
{\setbox\scratchbox\hbox{\useMPgraphic{##1}}%
\global\chardef\parfirst\zerocount
\getMPdata % \readlocfile{\MPdatafile}{}{}%
\setshapecharacteristics
\advance\!!counta by \parlines
\expandafter\appendtoks\the\partoks\to\!!toksa}%
\processcommalist[#1]\docommand
\global\parseriestrue
\xdef\totalparlines{\the\!!counta}%
\global\partoks\!!toksa
%\ifx\partoks\emptytoks\else % safeguard
\expanded{\parshape \the\!!counta \the\!!toksa}%
%\fi
\setshapecharacteristics % extra dummy
\ifparseries\def\par{\endgraf\adaptparshape}\fi
\EveryPar{\begstrut}}
\def\stopshapetext
{\endstrut
%\removebottomthings
\egroup
\global\newcounter\currentshapetext
\getshapecharacteristics}
\def\adaptparshape%
{\def\docommand##1%
{\ifcase\!!counta
\expandafter\appendtoks\space##1 \to\!!toksa
\else
\advance\!!counta \minusone
\fi}%
\!!counta\prevgraf
\doglobal\decrement(\totalparlines,\!!counta)%
\multiply\!!counta \plustwo
\!!toksa\emptytoks
\expanded{\processseparatedlist[\the\partoks][\space]}\docommand
\global\partoks\!!toksa
%\ifx\partoks\emptytoks\else % safeguard
\expanded{\parshape\totalparlines\the\partoks}%
}%\fi}
\def\getshapecharacteristics%
{\doglobal\increment\currentshapetext
\doifdefinedelse{parlines:\currentshapetext}
{\global\parlines \getvalue{parlines:\currentshapetext}%
\global\chardef\parfirst \getvalue{parfirst:\currentshapetext}%
\global\parvoffset \getvalue{parvoffset:\currentshapetext}%
\global\parhoffset \getvalue{parhoffset:\currentshapetext}%
\global\parwidth \getvalue{parwidth:\currentshapetext}%
\global\parheight \getvalue{parheight:\currentshapetext}}
{\global\parlines \plusone
\global\chardef\parfirst \zerocount
\global\parvoffset \zeropoint
\global\parhoffset \zeropoint
\global\parwidth \hsize
\global\parheight \vsize}}
\def\setshapecharacteristics%
{\doglobal\increment\currentshapetext
\setxvalue{parlines:\currentshapetext }{\the\parlines}%
\setxvalue{parfirst:\currentshapetext }{\the\parfirst}%
\setxvalue{parvoffset:\currentshapetext}{\the\parvoffset}%
\setxvalue{parhoffset:\currentshapetext}{\the\parhoffset}%
\setxvalue{parwidth:\currentshapetext }{\the\parwidth}%
\setxvalue{parheight:\currentshapetext }{\the\parheight}}
\def\getshapetext% option: unvbox
{\vbox\bgroup
\forgetall
\setbox\scratchbox\vbox to \parheight
{\expanded{\switchtobodyfont[\@@shbodyfont]}% evt strutheight en
\splittopskip\strutheight % lineheight opslaan
\vskip\parvoffset % scheelt switch en
\ifcase\parfirst\or\vskip\lineheight\fi % is ook veiliger
\hskip\parhoffset
\hbox{\vsplit\shapetextbox to \parlines\lineheight}}%
\wd\scratchbox\parwidth
\ht\scratchbox\parheight
\dp\scratchbox\zeropoint
\box\scratchbox
\getshapecharacteristics
\egroup}
\def\setupshapetexts%
{\dodoubleempty\getparameters[\??sh]}
\setupshapetexts%
[\c!bodyfont=]
%%%%%%% rotfont nog definieren
\doifundefined{RotFont}{\definefont[RotFont][RegularBold]}
\def\processfollowingtoken#1% strut toegevoegd
{\appendtoks#1\to\MPtoks
\setbox\MPbox=\hbox{\RotFont\setstrut\strut\the\MPtoks}%
\startMPdrawing
n := n + 1 ; len[n] := \the\wd\MPbox ;
\stopMPdrawing
\startMPdrawing[-]
% pic[n] := textext{\RotFont\setstrut\strut#1} ; % btex \RotFont\setstrut\strut#1 etex ;
pic[n] := btex \RotFont\setstrut\strut#1 etex ;
pic[n] := pic[n] shifted - llcorner pic[n] ;
\stopMPdrawing}
\startuseMPgraphic{followtokens}
% we default to nothing
\stopuseMPgraphic
\def\followtokens#1%
{\vbox\bgroup
\forgetall
\dontcomplain
\startMPenvironment
\doifundefined{RotFont}{\definefont[RotFont][RegularBold]}
\stopMPenvironment
\MPtoks\emptytoks
\resetMPdrawing
\startMPdrawing
\includeMPgraphic{followtokens} ;
picture pic[] ; numeric len[], n ; n := 0 ;
\stopMPdrawing
\handletokens#1\with\processfollowingtoken
\startMPdrawing
if unknown RotPath : path RotPath ; RotPath := origin ; fi ;
if unknown RotColor : color RotColor ; RotColor := black ; fi ;
if unknown TraceRot : boolean TraceRot ; TraceRot := false ; fi ;
if unknown ExtraRot : numeric ExtraRot ; ExtraRot := 0 ; fi ;
numeric al, at, pl, wid, pos ; pair ap, ad ;
al := arclength RotPath ;
if al=0 :
al := len[n] + ExtraRot ;
RotPath := origin -- (al,0) ;
fi ;
if al<len[n]:
RotPath := RotPath scaled ((len[n]+ExtraRot)/al) ;
al := arclength RotPath ;
fi ;
pl := (al-len[n])/(if n>1 : (n-1) else : 1 fi) ;
if TraceRot :
draw RotPath withpen pencircle scaled 1pt withcolor blue ;
fi ;
for i=1 upto n :
wid := abs(xpart urcorner pic[i] - xpart llcorner pic[i]) ;
pos := len[i]-wid/2 + (i-1)*pl ;
at := arctime pos of RotPath ;
ap := point at of RotPath ;
ad := direction at of RotPath ;
draw pic[i] shifted (-wid/2,0) rotated(angle(ad)) shifted ap
withcolor RotColor ;
if TraceRot :
draw boundingbox
pic[i] shifted (-wid/2,0) rotated(angle(ad)) shifted ap
withpen pencircle scaled .25pt withcolor red ;
draw ap
withpen pencircle scaled .50pt withcolor green ;
fi ;
endfor ;
\stopMPdrawing
\MPdrawingdonetrue
\getMPdrawing
\resetMPdrawing
\egroup}
% \followtokens
% {This is just a dummy text, kerned by T{\kern
% -.1667em\lower .5ex\hbox {E}}{\kern -.125emX} and typeset
% in a circle using {\setMFPfont M}{\setMFPfont
% E}{\setMFPfont T}{\setMFPfont A}{\setMFPfont
% P}{\setMFPfont O}{\setMFPfont S}{\setMFPfont T}.\quad}
\startuseMPgraphic{fuzzycount}
begingroup
save height, span, drift, d, cp ;
height := 3/ 5 * \baselinedistance ;
span := 1/ 3 * height ;
drift := 1/10 * height ;
pickup pencircle scaled (1/12 * height) ;
def d = (uniformdeviate drift) enddef ;
for i := 1 upto \MPvar{n} :
draw
if (i mod 5)=0 : ((-d-4.5span,d)--(+d-0.5span,height-d))
else : ((-d,+d)--(+d,height-d)) fi
shifted (span*i,d-drift) ;
endfor;
picture cp ; cp := currentpicture ; % for readability
setbounds currentpicture to
(llcorner cp shifted (0,-ypart llcorner cp) --
lrcorner cp shifted (0,-ypart lrcorner cp) --
urcorner cp -- ulcorner cp -- cycle) ;
endgroup ;
\stopuseMPgraphic
\setupMPvariables
[fuzzycount]
[n=10]
\def\fuzzycount#1%
{{\tx\useMPgraphic{fuzzycount}{n=#1}}}
\defineconversion[fuzzy][\fuzzycount]
%%%%%%%
\setupMPvariables
[EnglishRule]
[height=1ex,
width=\the\localhsize, % without \the, problems in non e-tex
color=darkgray]
\defineblank
[EnglishRule]
[medium]
\startuniqueMPgraphic{EnglishRule}{height,width,color}
height = \MPvar{height} ;
x1 = 0 ; x3 = \MPvar{width} ; x2 = x4 = .5x3 ;
y1 = y3 = 0 ; y2 = -y4 = height/2 ;
fill z1..z2..z3 & z3..z4..z1 & cycle withcolor \MPvar{color} ;
\stopuniqueMPgraphic
\def\EnglishRule%
{\startlinecorrection[EnglishRule]
\setlocalhsize \noindent \reuseMPgraphic{EnglishRule}
\stoplinecorrection}
%D The following macro returns a tight bound character
%D sequence.
%D
%D \useMPlibrary[txt]
%D
%D \startlinecorrection
%D \TightText{\ss\bf 123}{0cm}{3cm}{red}
%D \stoplinecorrection
\def\TightText#1#2#3#4%
{\hbox % \ruledhbox
{\startMPcode
picture p ; p := image (graphictext "#1" withfillcolor red) ;
draw p xsized #2 ysized #3 withcolor \MPcolor{#4} ;
\stopMPcode}}
\protect \endinput
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