Re: centering title and THEN adding something to the left of it

[Urs Liska]

Am 16.12.2013 02:24, schrieb Kieren MacMillan:
> I’d like to have the score title (i.e., the whole two-line column) 
> automatically centered (i.e., it should be lined up exactly with the book 
> title, in this case), and the boxed song number (which may have two or three 
> digits in other songs!) “float” to the left accordingly. What’s the easiest way 
> to accomplish this, without having to manually tweak each song?

One way is to add something to the right too and hide it by making it white:

\version "2.17.29"


\paper {
  bookTitleMarkup = \markup \fill-line { \abs-fontsize #18 
\fromproperty #'header:title }
  scoreTitleMarkup = \markup \center-column {
    \fill-line {
      { \abs-fontsize #18 \override #'(box-padding . 0.5) \box \concat 
{ "#" \fromproperty #'header:no } \hspace #0.5 }
      \override #'(baseline-skip . 0) \center-column {
            \abs-fontsize #18 \fromproperty #'header:title
            \abs-fontsize #13 \concat { "(" \fromproperty 
#'header:performers ")" }
          }
      { \with-color #white \abs-fontsize #18 \override #'(box-padding . 
0.5) \box \concat { "#" \fromproperty #'header:no } \hspace #0.5 }

    }
  }
}

\header {
  no = "1"
  title = "My Awesome Song"
  performers = "Me and You"
}

\score { c' }


HTH
Urs