On Nov 23, 2007 9:39 PM, Vyatcheslav Yatskovsky wrote:

Hello,

Thank you all very much. I'm pleased with number and quality of solutions to my problem. Did you look in supp-box at centerbox definition ? it' something like \vbox to \adimension{\vfill ....\vfill} (well, not \vfill, but \vss)

You approach was not so distant to solutions , you only forget that \vfill need a bit of attention. (hey even today sometimes i'm lost with \def and \edef...) Compare \starttext \vfill a \vfill \stoptext with \starttext \hskip1sp \vfill a \vfill \stoptext Given that 1sp is invisible to human eye , one can appreciate here a "butterfly effect" :)) -- luigi ... it's new . it's powerful . it's luatex . http://www.luatex.org

you can use \dontleavehmode in this case. yes, i know.

\meaning\ \dontleavehmode gives \quitvmode \meaning\quitvmode gives \quitvmode hence \quitvmode is a primitive . \quitvmode The primitive instructs pdfTEX to quit the vertical mode and start typesetting a paragraph. \quitvmode has the same effect as \leavevmode definition from plain macro package. Note however, that \leavevmode may conflict with \everypar tokens list. No such risk while using \quitvmode instead The primitive has been introduced in pdfTEX 1.21a. \hskip1sp give more the sense of invisible touch ... -- luigi ... it's new . it's powerful . it's luatex . http://www.luatex.org