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From: jeffrey@cs.chalmers.se (Alan Jeffrey)
Newsgroups: comp.text.tex
Subject: Re: LaTeX logo in TeX
Message-ID: <4415@undis.cs.chalmers.se>
Date: 22 Mar 91 01:39:28 GMT
Article-I.D.: undis.4415
References: <66552@eerie.acsu.Buffalo.EDU> <66567@eerie.acsu.Buffalo.EDU> <15524@june.cs.washington.edu> <1991Mar20.213735.27656@csrd.uiuc.edu>
Sender: news@cs.chalmers.se
Organization: Dept. of CS, Chalmers, Sweden
Lines: 64

In article <1991Mar20.213735.27656@csrd.uiuc.edu> eijkhout@s41.csrd.uiuc.edu (Victor Eijkhout) writes:
>\def\LaTeX{{\count0=\fam$\fam=\count0\relax
>    L\kern-.36em\raise.3ex\hbox{$\fam=\count0\relax\scriptstyle A$}
>    \kern-.15em \TeX$}}

Ah, but even this runs into problems---it requires the old font
selection scheme---under newlfont.sty, \sf, \it, etc don't set \fam,
so you need something else.  It also requires every text font to have
an associated math family, which is a bit of a pain, since TeX only
gives you 16, grumble grumble grumble.  What you really want is a
command \smaller, which takes you to a smaller text size.  Why oh why
isn't this in \LaTeX?  Oh well...

I've just finished writing our Local Guide (57pp, I'll email copies if
anyone's interested in seeing what I reckon a Local Guide really ought
to look like, but be warned I'm about to go away for 2 weeks) and that
used the word \LaTeX\ in all sorts of strange circumstances
(sans-serif huge slanted, for instance) so I changed the definition of
\normalsize etc. in aqua.sty (the document style it runs in, also
available for parties, and other social occasions):

\def\@normalsize{...\def\smaller{\protect\scriptscriptsize}}
...
\def\Huge{...\def\smaller{\protect\Large}}

(Exercise for the reader: why \protect?)  Then:

\def\LaTeX{\protect\pLaTeX}
\def\pLaTeX{{L\kern-.3em\raise.48ex\hbox{\smaller A}\kern-.15em\TeX}}

(Exercise for the reader: why \protect?)

I played around with the kerns above to get \LaTeX\ to look good in
huge sans serif, which is how the headings are set.

The only other trick is that you need to redefine \TeX depending on
which family you're currently in:

\def\cmrTeX{T\kern-.1667em\lower.5ex\hbox{E}\kern-.125emX}
\def\cmssTeX{T\kern-.2em\lower.5ex\hbox{E}\kern-.05emX}
\def\cmttTeX{T\lower.5ex\hbox{E}X}
\def\ccrTeX{T\kern-.1667em\lower.5ex\hbox{E}\kern-.125emX}

Then, assuming you're using the font selection scheme:

\def\TeX{\protect\pTeX}
\def\pTeX{{\csname\f@family TeX\endcsname}}

(Exercise for the reader: yes, you know.)

Easy really ;-)

Related questions: why is the LaTeX book not called `The LaTeXbook'?
Why is sc incompatible with it and sl in the new font selection
scheme?  (Otherwise this would all be easy, and \LaTeX would go back
to it's original definition, you'd just need to have sans-serif
extended-bold slanted small caps lying around.)  Why is the word LaTeX
on the back cover of the LaTeX book so appallingly set?

Time for bed, said Zebbidee,

Alan.
Alan Jeffrey         Tel: +46 31 72 10 98         jeffrey@cs.chalmers.se
Department of Computer Sciences, Chalmers University, Gothenburg, Sweden