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Re: [Groff] Coloured equations?

From: Tadziu Hoffmann
Subject: Re: [Groff] Coloured equations?
Date: Tue, 6 Feb 2007 19:43:05 +0100
User-agent: Mutt/1.5.13 (2006-08-11)

> Actually, your suggestion is very nice IMHO.

It's dependent on too many assumptions.  And the colors
are assigned only on basis of the font used, not on the
semantics of the formula.  [Not that we would really need
this all of a sudden.  In most of history, mathematicians
have been able to make do with simple black-and-white
equations.  Now, on the other hand, colorizing *parts* of
equations (or using colored boxes, see attached PDF) for
didactic purposes could indeed be useful, but that would
not mean an all-out attack but rather a selective insertion
of \m-escapes by hand, which has been possible ever since
\m was introduced (and before that, via device specials).]

> Why do you need \R?  It's `eqn' which interprets $foobar$ --
> why can't it be translated to
>   .nr eqn-font \n[.f]
>   .nr eqn-size \n[.s]
>   foobar
>   .ft \n[eqn-font]
>   .ps \n[eqn-size]u

It's just that I had noticed that eqn inserts stuff like the

  .ds 0sfont \R'0sifont \\n[.f]' etc. (save font)
  .ds 0rfont \f[\\n[0sifont]]    etc. (restore font)
  .as1 10 \&\E*[0sfont] -- lots of eqn stuff -- \E*[0rfont]

and had assumed that this would allow doing things like

  .ds xx "This is an equation: $x = sqrt ( 2 )$.
  .ps +10

but this doesn't work as I wished it to.

Attachment: coloreqn-2.pdf
Description: Adobe PDF document

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