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\def\fileversion{5}
\def\filedate{1994/04/15}
\def\docdate{1994/04/15}
% \iffalse
%% File: textfit.dtx Copyright (C) 1994 Sebastian Rahtz and Phil Taylor
%
% This package is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
%
%<*driver>
\documentclass{ltxdoc}
\usepackage{textfit}
\begin{document}
\title{The \textsf{textfit} package for
scaling up text to a desired size\thanks{This file
has version number \fileversion, last
revised \filedate.}}
\author{Sebastian Rahtz \and Phil Taylor}
\date{\filedate}
\maketitle
\tableofcontents
\DocInput{textfit.dtx}
\end{document}
%</driver>
% \fi
% \CheckSum{281}
%
% \section{Introduction}
%
% The user needs to be able to specify the width or height for text, and
% use the largest size necessary to fill that width or height. You
% can choose whether to have the size increased by simple points, or
% by using magsteps.
% Usage:
% \verb|\scaletowidth{3in}{This is the way of the world}|
% \verb|\scaletoheight{7mm}{This is the way of the world}|
% Details are controlled by two options: `magstep' will
% make the system use magsteps, not points, and `noisy'
% will produce useful messages.
% \changes{1}{5/2/93}{Worked out point size by trial and error, increasing
% it in increments of 1pt until result reached desired size}
% \changes{2}{9/2/93}{Final point size calculated by comparison of size at
% 10pt. faster, and takes less TeX memory for intermediate fonts}
% \changes{3}{10/1/94}{Revised to make it a \LaTeXe\ package}
% \changes{4}{6/2/94}{It only worked if `noisy' option was given ...}
% \changes{5}{15/4/94}{Checked again for \LaTeXe}
%
%Examples; note that the base font is taken from the current state when
%you enter the macros. so if you start off with a large font (eg
%cmr17), it will give a different result from that obtained by scaling
%up cmr5.
%
%\scaletowidth{1in}{This is the way of the world}
%
%{\Huge \scaletowidth{1in}{This is the way of the world}}
%
%{\Huge \scaletowidth{5in}{This is the way of the world}}
%
%\scaletowidth{5in}{This is the way of the world}
%
%{\Huge \scaletoheight{1.3in}{Cowabunga!} }
%
% \scaletowidth{5in}{Gloucestershire Warwickshire Railway}
%
%\ScalebyMagstepstrue
%
%\scaletowidth{1in}{This is the way of the world}
%
%{\Huge \scaletowidth{1in}{This is the way of the world}}
%
%{\Huge \scaletowidth{5in}{This is the way of the world}}
%
%\scaletowidth{5in}{This is the way of the world}
%
%{\Huge \scaletoheight{1.3in}{Cowabunga!} }
% \StopEventually{}
% \begin{macrocode}
%<*package>
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{textfit}[\filedate]
\newif\ifScalebyMagsteps
\newif\ifNoisyFitting
\NoisyFittingfalse
\ScalebyMagstepsfalse
\DeclareOption{noisy}{\NoisyFittingtrue}
\DeclareOption{magstep}{\ScalebyMagstepstrue}
\ProcessOptions
\newcount \mags@f@r
\newdimen \desired@size
\newcount \r@mainder
\newcount \m@gstepcount
\newcount \m@gsteplimit
\newcount \m@gstepvalue
\newdimen \m@gstepdimen
% \end{macrocode}
% Code for working out the right magstep (this is Phil's bit).
% \begin{macrocode}
\def \magsteps {\afterassignment \m@gsteps \m@gsteplimit = }
\def \m@gsteps
{\let \@r = \or
\def \or {\noexpand \or}%
\m@gstepdimen = 0.166667 \maxdimen
\m@gstepvalue = 1000
\m@gstepcount = 0
\def \magstep {}%
\loop
\ifnum \m@gstepcount < \m@gsteplimit
\advance \m@gstepcount by 1
\ifnum \m@gstepvalue > \m@gstepdimen
\advance \m@gstepcount by -1
\message {Sorry --- integer overflow would occur if
I went any further; stopped at
\the \m@gstepcount.}
\m@gsteplimit = \m@gstepcount
\else
\multiply \m@gstepvalue by 12
\multiply \r@mainder by 12
\divide \r@mainder by 10
\advance \m@gstepvalue by \r@mainder
\r@mainder = \m@gstepvalue
\divide \m@gstepvalue by 10
\multiply \m@gstepvalue by 10
\advance \r@mainder by -\m@gstepvalue
\divide \m@gstepvalue by 10
\ifnum \r@mainder < 5
\edef \magstep {\magstep \or \the \m@gstepvalue}%
\else
\advance \m@gstepvalue by 1
\edef \magstep {\magstep \or \the \m@gstepvalue}%
\advance \m@gstepvalue by -1
\fi
\fi
\repeat
\edef \magstep ##1%
{\noexpand \ifcase ##1
1000\magstep
\noexpand \else 0%
\noexpand \message
{Sorry --- \string \magstep \space ##1
is not in range 0 .. \the \m@gsteplimit}%
\noexpand \fi
\noexpand \relax
}%
\let \or = \@r
}
\magsteps 63
\def \Fontname #1{\expandafter \strip@size \fontname #1 }
\def \strip@size #1 #2#{#1\void@@@}
\def \void@@@ #1{}
\gdef\n@d#1.#2:{#1}
\def \@scaletofit[#1]#2#3{%
\def\Hb@x{h}\def\H@rV{#1}%
\ifx\H@rV\Hb@x\def\C@mpare{\wd}\else\def\C@mpare{\ht}\fi
\desired@size #2
\def\curr@fontname{\Fontname \font {} }%
\ifScalebyMagsteps
\mags@f@r \z@
\setbox 0 = \hbox{#3}%
\def\@increment{1}%
\def\@test{<}%
\ifdim \C@mpare 0 > \desired@size
\message{When scaling by Magsteps, you cannot go downwards!}%
\fi
\loop
\font \temp@font = \curr@fontname scaled \magstep \mags@f@r
\setbox 0 = \hbox{{\temp@font #3}}%
\ifNoisyFitting
\message {Trying \noexpand \magstep \the \mags@f@r...}%
\fi
\ifdim \C@mpare 0 \@test \desired@size
\advance \mags@f@r by \@increment
\repeat
\ifnum \mags@f@r=\z@
\mags@f@r1
\fi
\advance \mags@f@r by -\@increment
\else
\font\temp@font=\curr@fontname at1pt
\setbox 0 = \hbox{{\temp@font #3}}%
\@tempdima\C@mpare0
\multiply\@tempdima by 500 %\@m
\def\foo@@{\expandafter\n@d\the\@tempdima:}%
\@tempdimb\desired@size
\divide\@tempdimb by \foo@@
\multiply\@tempdimb by 500 %\@m
\fi
\ifScalebyMagsteps
\ifNoisyFitting
\message {The calculated font is \curr@fontname
scaled \noexpand \magstep \the \mags@f@r}%
\fi
\font \temp@font = \curr@fontname scaled \magstep \mags@f@r
\else
\ifNoisyFitting
\message {The calculated font is \curr@fontname ->\the\@tempdimb}%
\fi
\font\temp@font=\curr@fontname at \the\@tempdimb
\fi
\ifx\H@rV\Hb@x
\hbox to \desired@size {\hss{\temp@font #3}\hss}%
\else
\hbox {{\temp@font #3}}%
\fi
}
% user interface
\def\scaletowidth{\@scaletofit[h]}
\def\scaletoheight{\@scaletofit[v]}
%</package>
% \end{macrocode}
% \Finale
\endinput
%
%% \CharacterTable
%% {Upper-case \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%% Lower-case \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%% Digits \0\1\2\3\4\5\6\7\8\9
%% Exclamation \! Double quote \" Hash (number) \#
%% Dollar \$ Percent \% Ampersand \&
%% Acute accent \' Left paren \( Right paren \)
%% Asterisk \* Plus \+ Comma \,
%% Minus \- Point \. Solidus \/
%% Colon \: Semicolon \; Less than \<
%% Equals \= Greater than \> Question mark \?
%% Commercial at \@ Left bracket \[ Backslash \\
%% Right bracket \] Circumflex \^ Underscore \_
%% Grave accent \` Left brace \{ Vertical bar \|
%% Right brace \} Tilde \~}
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