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Code Editor : relsize.sty

% relsize.sty       3.1       July 4, 2003
% This software is contributed to the public domain.

% LaTex2e version by Donald Arseneau <asnd@triumf.ca> and
% Matt Swift <swift@bu.edu>.
% Original LaTex2.09 smaller.sty author: Bernie Cosell <cosell@WILMA.BBN.COM> 
%
% Setting the font size relative to the current size
%
% commands are:
% \relsize{n}  where n gives the number of steps ("mag-step" = factor of 1.2)
%              to change the size by;  n = 3 changes from \normalsize to 
%              \LARGE size.  Negative n selects smaller fonts.
% \smaller == \relsize{-1}
% \larger  == \relsize{1}
% \textsmaller{text}, \textlarger{text} - versions that take an argument
%
% \relscale{f} is equivalent to \relsize, but instead of scale-steps,
%               the parameter is a scale factor, such as .75
% \textscale{f}{text}
%
% The font-size command nearest the requested size will be used, and if
% the size error is more than \RSpercentTolerance, then the size will
% be adjusted more precisely.  (The default empty \RSpercentTolerance
% signals automatic handling, choosing the tolerance based on the
% font declarations.)
%
% \mathsmaller{A}, \mathlarger{B}       - math versions 
%   (The math versions are entirely different from the text versions.)
%
% There are more instructions at the end of this file (after \endinput).

\ProvidesPackage{relsize}[2003/07/04 ver 3.1]

% The next two aren't the real initializations!  The real ones are done
% in \@tempb below.  The user can change them afterwards.

\def\RSsmallest{999pt}
\def\RSlargest{1pt}

% First, right now, we assemble a list of the font sizes

\def\rs@size{\noexpand\rs@size\noexpand}
\def\rs@fontsizes{}
\def\@tempa#1{\ifx\@undefined#1\else
  \expandafter\@tempb#1\delimiter{#1}\fi}
\def\@absVal#1{\ifnum#1<\z@-\fi#1}
% parse definition of font-size command (like \large)
% #1 = \@setfontsize  #2 = the command (\large) #3 = size #4 = rest
\def\@tempb#1#2#3#4\delimiter#5{%
  \@tempdimb\z@
  \ifx\@setfontsize#1\relax\ifx#5#2\@firstofone\relax
    \afterassignment\strip@prefix \@tempdimb #3pt>%
  \fi\fi
  \ifdim\@tempdimb=\z@
    \def\rs@fontsizes{}%
    \let\@tempa\@gobble
  \else
    \edef\rs@fontsizes{\rs@fontsizes\rs@size#2{\the\@tempdimb}}%
    \ifdim\@tempdimb<\RSsmallest \edef\RSsmallest{\the\@tempdimb}\fi
    \ifdim\@tempdimb>\RSlargest \edef\RSlargest{\the\@tempdimb}\fi
  \fi}

% examine each (expected) pre-defined font size 
\@tempa\normalsize
\@tempa\small
\@tempa\footnotesize
\@tempa\large
\@tempa\Large
\@tempa\LARGE
\@tempa\scriptsize
\@tempa\tiny
\@tempa\huge
\@tempa\Huge
\@tempa\HUGE  % moresize.sty
\@tempa\ssmall

\ifx\rs@fontsizes\@empty % ----------------------------------------------

\PackageWarning{relsize}{Failed to get list of font sizes.\MessageBreak
  Falling back to old definition.}

\DeclareRobustCommand\relsize[1]{%
\ifmmode \@nomath\relsize\else
 \begingroup
 \@tempcnta % assign number representing current font size
   \ifx\@currsize\normalsize 4\else   % funny order is to have most ...
    \ifx\@currsize\small 3\else       % ...likely sizes checked first
     \ifx\@currsize\footnotesize 2\else
      \ifx\@currsize\large 5\else
       \ifx\@currsize\Large 6\else
        \ifx\@currsize\LARGE 7\else
         \ifx\@currsize\scriptsize 1\else
          \ifx\@currsize\tiny 0\else
           \ifx\@currsize\huge 8\else
            \ifx\@currsize\Huge 9\else
            4\rs@unknown@warning % unknown state: \normalsize as starting point
 \fi\fi\fi\fi\fi\fi\fi\fi\fi\fi
%  Change the number by the given increment:
 \advance\@tempcnta#1\relax
%  watch out for size underflow:
 \ifnum\@tempcnta<\z@ \rs@size@warning{small}{\string\tiny}\@tempcnta\z@ \fi
 \expandafter\endgroup
 \ifcase\@tempcnta  % set new size based on altered number
    \tiny \or \scriptsize \or \footnotesize \or \small \or \normalsize \or 
    \large \or \Large \or \LARGE \or \huge \or \Huge \else 
     \rs@size@warning{large}{\string\Huge}\Huge
\fi\fi}

\else % ----------------------------------------------

\DeclareRobustCommand\relsize[1]{%
\ifmmode \@nomath\relsize\else
  \begingroup
  % number of demi-magsteps -> \@tempcnta
  \@tempdima#1\p@ \@tempdima2.0002\@tempdima \divide\@tempdima\p@
  \@tempcnta\@tempdima
  % \message{^^JChange \the\@tempcnta\space half-magsteps from \f@size. }%
  % calculate desired target size -> \@tempdimb
  \@tempdimb\f@size\p@
  \ifnum\@tempcnta<\z@ 
    \def\@tempa{.912871}\@tempcnta=-\@tempcnta
  \else
    \def\@tempa{1.09545}%
  \fi
  \@whilenum {\@tempcnta>\z@}\do {%
    \advance\@tempcnta\m@ne
    \@tempdimb\@tempa\@tempdimb}%
  % \message{ target size \the\@tempdimb. }%
  \rs@scaleToB
\fi}

\DeclareRobustCommand\relscale[1]{%
\ifmmode \@nomath\relscale\else
  \begingroup
  \@tempdimb\f@size\p@ \@tempdimb#1\@tempdimb
  \rs@scaleToB
\fi}

\DeclareRobustCommand\textscale[2]{\leavevmode
  \begingroup\relscale{#1}#2\endgroup}

%  Change font size to \@tempdimb.  Follows from \relsize or \relscale
\def\rs@scaleToB{%
  % perform automatic tolerance adjustment, if requested
  \ifx\RSpercentTolerance\@empty \rs@autoTol \fi
  % apply limits
  \ifdim\@tempdimb<\RSsmallest \@tempdimb=\RSsmallest 
      \rs@size@warning{small}{\RSsmallest}\fi
  \ifdim\@tempdimb>\RSlargest \@tempdimb=\RSlargest 
      \rs@size@warning{large}{\RSlargest}\fi
  % look up that size in list of pre-defined sizes.  Puts error of
  % closest match in \@tempdima
  \let\@tempa\relax  \@tempdima\maxdimen
  \let\rs@size\rs@lookup  \rs@fontsizes
  % \message{ Look up best as \expandafter\string\@tempa\space 
  %     (off by \the\@tempdima}%
  % See how close match was (abs difference -> \@tempdima)
  \ifdim\@tempdima<\z@ \@tempdima-\@tempdima\fi
  %  ... percentage error in \@tempdima (as a count)
  \@tempdima 100\@tempdima \divide\@tempdima\@tempdimb
  % if error is beyond tolerance, append \fontsize adjustment
  % \message{ or \number\@tempdima \expandafter\@gobble\string\%). }%
  \ifnum\@tempdima>\RSpercentTolerance
    % \message{ adjust size to \strip@pt\@tempdimb. }%
    \@tempdima1.2\@tempdimb % baselineskip
    \edef\@tempa{\expandafter\noexpand\@tempa \noexpand\fontsize
      {\strip@pt\@tempdimb}{\strip@pt\@tempdima}\noexpand\selectfont}\fi
  % Now execute size-change command \@tempa
  \expandafter\endgroup\@tempa}

% For each defined font size, compare its actual size to the desired
% size (\@tempdimb) and the error of the best previous match (\@tempdima).
% Record this command (\@tempa) if it is closer.
\def\rs@lookup#1#2{% #1=command #2=size
  \begingroup
  \advance\@tempdimb-#2\relax
  \ifdim\@absVal\@tempdimb<\@absVal\@tempdima % improvement
    \endgroup
    \def\@tempa{#1}%
    \@tempdima#2\relax \advance\@tempdima-\@tempdimb
  \else
    \endgroup
  \fi}

\fi  % ----------------------------------------------

% Tolerance for size mis-match (%).  The empty definition triggers
% automatic selection: 5 for scalable fonts, 30 otherwise.

\def\RSpercentTolerance{}

\def\rs@autoTol{%
  \expandafter\expandafter\expandafter\rs@autoTOL
  \expandafter\meaning
  \csname\f@encoding/\f@family/\f@series/\f@shape\endcsname-\delimiter
}
\def\rs@autoTOL#1>#2-#3\delimiter{%
   \ifx\delimiter#3\delimiter % no -
     \def\RSpercentTolerance{30}%
   \else % font size def has -, assume it covers continuum 
     \def\RSpercentTolerance{5}%
   \fi
   % \message{ Automatic tolerance is \RSpercentTolerance. }%
}

%  Warning messages

\newcommand\rs@size@warning[2]{\PackageWarning{relsize}{%
 Size requested is too #1.\MessageBreak Using #2 instead}}

\newcommand\rs@unknown@warning{\PackageWarning{relsize}{Current font size 
 is unknown! (Why?!?)\MessageBreak Assuming \string\normalsize}}

% derived commands

\DeclareRobustCommand\larger[1][\@ne]{\relsize{+#1}}
\DeclareRobustCommand\smaller[1][\@ne]{\relsize{-#1}}
\DeclareRobustCommand\textlarger[2][\@ne]{{\relsize{+#1}#2}}
\DeclareRobustCommand\textsmaller[2][\@ne]{{\relsize{-#1}#2}}

% math commands (completely different)

\DeclareRobustCommand\mathsmaller[1]{\bgroup
  \let\rs@makechoice\rs@makesmallerchoice
  \def\rs@mathatom{#1}%
  \futurelet\@tempa\rs@collect@decor
}
\DeclareRobustCommand\mathlarger[1]{\bgroup
  \let\rs@makechoice\rs@makelargerchoice
  \def\rs@mathatom{#1}%
  \futurelet\@tempa\rs@collect@decor
}

% math so far is in \rs@mathatom; next tok is \@tempa; continuation is \@tempb
% Don't nest \ifs because token may be \if or \fi or \or...
\def\rs@collect@decor{%
  \let\@tempb\rs@makechoice
  \ifx\@tempa\limits \let\@tempb\rs@collect@one@decor \fi
  \ifx\@tempa\displaylimits \let\@tempb\rs@collect@one@decor \fi
  \ifx\@tempa\nolimits \let\@tempb\rs@collect@one@decor \fi
  \if\noexpand\@tempa^\let\@tempb\rs@collect@two@decor \fi 
  \if\noexpand\@tempa_\let\@tempb\rs@collect@two@decor \fi 
  \ifx\@tempa\sp \let\@tempb\rs@collect@two@decor \fi
  \ifx\@tempa\sb \let\@tempb\rs@collect@two@decor \fi
  \@tempb}
\def\rs@collect@one@decor#1{%
  \expandafter\def\expandafter\rs@mathatom\expandafter{\rs@mathatom#1}%
  \futurelet\@tempa\rs@collect@decor}
\def\rs@collect@two@decor#1#2{\expandafter
  \def\expandafter\rs@mathatom\expandafter{\rs@mathatom#1{\rs@sstyle{#2}}}%
  \futurelet\@tempa\rs@collect@decor}
\let\rs@sstyle\@firstofone

\def\rs@makesmallerchoice{\mathchoice
  {\textstyle \let\rs@sstyle\scriptstyle \rs@mathatom}%
  {\scriptstyle \let\rs@sstyle\scriptstyle \rs@mathatom}%
  {\scriptscriptstyle \let\rs@sstyle\scriptscriptstyle \rs@mathatom}%
  {\scriptscriptstyle \let\rs@sstyle\scriptscriptstyle \rs@mathatom}%
 \egroup}
\def\rs@makelargerchoice{\mathchoice
  {\protected@edef\rs@sstyle##1{%
      \protect\set@fontsize {1}{\f@size}{\f@baselineskip}\protect\selectfont
      \hbox{$\scriptstyle ##1\m@th$}}%
   \mbox{\larger$\displaystyle\rs@mathatom\m@th$}}%
  {\displaystyle \let\rs@sstyle\scriptstyle \rs@mathatom}%
  {\textstyle \let\rs@sstyle\scriptscriptstyle \rs@mathatom}%
  {\scriptstyle \let\rs@sstyle\scriptscriptstyle \rs@mathatom}%
 \egroup}

\endinput
==========================================================

R E L S I Z E . S T Y           ver 3.1      July 4, 2003

by Donald Arseneau,  asnd@triumf.ca,  Vancouver, Canada
origianally based on smaller.sty by Bernie Cosell, cosell@WILMA.BBN.COM, 
and combined with the version by Matt Swift, swift@bu.edu.

It is frequently the case that something should be typeset somewhat larger
or smaller than the surrounding text, whatever that size happens to be.
Specifying such sizing commands explicitly makes it difficult to modify the
font sizes of a document at a later time, and makes it hard to write macros
that work at arbitrary sizes.  Relsize.sty defines several commands for LaTeX
to set font sizes relative to the current size.

To refresh your memory, the font sizing commands in LaTeX are, in order:
\tiny, \scriptsize, \footnotesize, \small, \normalsize, \large, \Large,
\LARGE, \huge, \Huge (package moresize adds \ssmall and \HUGE).  The main 
new command provided by relsize.sty is \relsize, which takes one (positive
or negative) number as its argument; the number specifies how many "steps"
by which to change the font size, where each step is a scaling factor of
1.2, corresponding to the usual difference between the size commands.  For
example, if "{\relsize{-2} smaller}" appears in normal sized text, the word
"smaller" is printed in script size type.  If the same command appears in a 
\Large section title, then "smaller" is printed in normal size.

There are also the commands \larger and \smaller, which normally change the
font size by one step in the obvious direction; \larger is an abbreviation
for \relsize{+1}, and \smaller is an abbreviation for \relsize{-1}. For
example, {\large... \larger{WOW!}} prints "WOW" in \Large type.  You can
also specify bigger steps as an optional argument for \larger and \smaller: 
\larger[3] is equivalent to \relsize{3}; \smaller[2] is \relsize{-2}.
Both \larger and \smaller accept negative arguments, but please don't make
things so obscure!  If you want to change size by several steps it is 
much better to give an increment than to string several \larger commands
together; i.e., \relsize{3} or \larger[3], but not \larger\larger\larger.

All of the \relsize, \larger, and \smaller commands are "switches" just
like the regular sizing commands.  That is, they change the size for all
following text until the scope is ended by a closing brace.  There are
alternate versions called \textlarger and \textsmaller that take some text
as an argument and apply the size change to only that text:
\textlarger{big}.

Using the number of "magnification steps" to indicate font size can
be confusing to some people, and limiting in certain uses.  There are 
commands with syntax \textscale{factor}{text} and \relscale{factor} to
select the size based on a scale factor, like {0.75}.

If the size requested is too small or too large, a warning is given, and
the size will only change as far as appropriate, typically \tiny or \Huge.
These limits are controlled by the commands \RSsmallest and \RSlargest, which
get set automatically when relsize.sty is loaded, but you can redefine them
to other length values: \renewcommand\RSlargest{50pt}.

Fine point:  The combination \relsize{n}\relsize{-n} is not guaranteed to 
restore the current font size!  That is because the increment "n" may be
enough to overflow the range of sizes.  Say you are in \huge text already,
and you do \relsize{4}.  There is nothing bigger than \Huge so that is the
size you get.  Then an ensuing \relsize{-4} will take four steps smaller
and change the size to \large.  You should use grouping to undo relative 
size changes because it is unsafe to counteract one change with an "equal" 
change in the opposite direction.

Typically, the font-size commands do not select fonts at regular size
intervals.  \relsize (and the others) will select, and execute, the command
for the size closest to the desired size.  Then, if the relative difference 
from the target size is more than \RSpercentTolerance a further font-size
selection is made.  By default, \RSpercentTolerance is an empty macro, which
causes automatic selection: "30" (30%) when the current "fontshape" definition
is composed of only discrete sizes, and "5" when the fontshape definition
covers ranges of sizes.  The higher setting for discrete fonts ensures
only the pre-defined sizes get used.  (By default LaTeX uses Computer
Modern fonts at discrete sizes; you get full coverage of sizes by using
\usepackage{type1cm}.)  For special uses, or when the font shape definitions 
are not parsed properly, you can redefine the percent tolerance: 
\renewcommand\RSpercentTolerance{10}.

All of the commands described above are text commands; they cannot be used
in math mode.  There are special \mathsmaller and \mathlarger commands
provided, but these do not use the same sizes that the text versions use.
Instead, they step between the usual math "styles" which you can explicitly
set using the commands \displaystyle, \textstyle, \scriptstyle, and
\scriptscriptstyle [see Lamport, LaTeX/Manual (1st ed, p.54); GMS The LaTeX
Companion, p.255].  However, the \mathlarger command will also increase the
size beyond regular \displaystyle by selecting a larger regular font size
(using \larger).  (Yes, this is a kludge, and doesn't work very well, but 
it can still be useful.)  If you want to use this to create big integral 
signs, then you must also load the package "exscale" so that math symbols
can change size.  The sizes selected are:

Current style       \mathsmaller gives         \mathlarger gives
---------------     ----------------------     ------------------------
\displaystyle       \textstyle (almost same)   \displaystyle in a \larger font
\textstyle          \scriptstyle               \displaystyle (almost same)
\scriptstyle        \scriptscriptstyle         \textstyle
\scriptscriptstyle  \scriptscriptstyle (same)  \scriptstyle

For example, try $\frac{\mathlarger{E}}{E}$.  Note that, for most symbols,
\displaystyle and \textstyle are the same size, so $N \mathlarger{N}$ 
gives two identical N's, but \sum and \int do get bigger in display style: 
$\int\mathlarger{\int}$, and fractions are treated differently too: 
$\frac{1}{2} \mathlarger{\frac{1}{2}}$.  As you might have guessed, 
\mathlarger and \mathsmaller should only be used in math mode.

These commands will attempt to attach superscripts and subscripts to the 
symbol as if the symbol were used alone: $\mathlarger{\int}_{0}^{\infty}$
but math accents and the math spacing behave as if the symbol is enclosed
in braces (which it is).  Comparing 
\[
| \times | {\times} | \mathlarger{\times} | \mathbin{\mathlarger{\times}} |
\] 
shows that operators must be explicitly declared to use the right operator
type (\mathrel, \mathbin, \mathop) to get the correct spacing.

Due to their oddities, the math larger/smaller commands should not be 
trusted blindly, and they will not be useful in every instance.

Donald Arseneau                         asnd@triumf.ca

${this.title}

Code Editor : relsize.sty