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From: "Pawel Jackowski na Onet" <jackos1@poczta.onet.pl>
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Subject: Re: Vertical alignment of formulas
Date: Wed, 17 Sep 2003 19:24:21 +0200
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Hi

> one complication is that the last line width is not available outside math
> mode (which is a pain)

If really needed one can use quite old plain macro which try to soften this
pain... However for short
paragraphs it needs some changes (\prevgraf can't be less then zero). Meybe
this is not very nice but...

\newif\ifmeasdisp \measdispfalse
\newcount\lineno
\newdimen\linesize
\def\measline{\ifhmode
              \bgroup
              \parfillskip=0pt plus 1fil
              \predisplaypenalty=10000
              \postdisplaypenalty=10000
              \displaywidowpenalty=\widowpenalty
              \abovedisplayskip=-\baselineskip
              \belowdisplayskip=-\baselineskip
              \abovedisplayshortskip=-\baselineskip
              \belowdisplayshortskip=-\baselineskip
              $$\global\linesize=\predisplaysize$$
              \global\advance\linesize by -2em
              \global\lineno=\prevgraf
              \global\advance\lineno by -3
              \ifmeasdisp\immediate\write16{>>\the\lineno: \the\linesize}\fi
              \global\advance\lineno by -1
              \global\prevgraf=\lineno
              \kern\linesize
              \egroup
              \else
              \immediate\write16{! I'M IN VMODE---MEASURING IGNORED}%
              \fi}
% ------------------------------------------------------------------------
% Author: B. Jackowski, 22 V 1990.
% ------------------------------------------------------------------------

Regards