Re: New member - Bar numbers placement problem

[David Nalesnik]

Hi Kieren,

On Thu, Oct 23, 2014 at 8:31 AM, Kieren MacMillan <address@hidden> wrote:

Hi David,

> I think that if you want automation your best approach would be to look at modifying the position of BarNumber.

I thought of that at first, but rather hoped the InstrumentName thing would work out…  =\

Question: Can the BarNumber *position* be set from the “expected position” of InstrumentName?
If so, maybe you could apply an after-line-break callback function to move system-initiating BarNumbers to where the InstrumentName would normally be?

Querying Y-position of objects tends to have disastrous results.

The following routine gets at the InstrumentName grob from BarNumber, and asking for details of Y-positioning (relative to System) gives answers, but destroys the layout:

\version "2.19.15"

#(define (Y-pos-of-InstrumentName-from-BarLine grob)

   (let* ((refp (ly:grob-system grob))

          (all-grobs (ly:grob-array->list (ly:grob-object refp 'all-elements)))

          (grob-name (lambda (x) (assq-ref (ly:grob-property x 'meta) 'name)))

          (IN (filter (lambda (x) (eq? (grob-name x) 'InstrumentName)) all-grobs)))

     (if (pair? IN)

         (begin

          (format #t "~a Y-coord: ~a Y-offset: ~a~%"

            (grob-name (car IN))

            (ly:grob-relative-coordinate (car IN) refp Y) ; destroys vertical spacing

            (ly:grob-property (car IN) 'Y-offset) ; destroys vertical spacing

            )))))

music = \repeat unfold 20 {

  c4 d e f

}

\score {

  \new PianoStaff \with { shortInstrumentName = "pno." } <<

    \new Staff {

      \relative c'' {

        \music

      }

    }

    \new Staff {

      \clef bass

      \music

    }

  >>

  \layout {

    \context {

      \Score

      \override BarNumber.after-line-breaking = #Y-pos-of-InstrumentName-from-BarLine

    }

  }

}

[Currently pursuing another line of inquiry suggested to me--will report back.]

Best,

David