Re: MetronomeMark alignment after break

[Kieren MacMillan]

Hi Daniel,

> Any ideas as to how to work around it in the meantime?

This hack (can't remember who did this for me?) seems to work.

Hope it helps!
Kieren.

\layout {
  \context {
    \Score
    \override MetronomeMark #'after-line-breaking =
    #(lambda (grob)       
       (and
        ;; probably overkill, but better to be on the safe side
        (= (ly:item-break-dir grob) RIGHT)
        ;; if the X-parent is suicided, it was originally
        ;; a copy of the BarLine at the end of the previous
        ;; system, which means there are no useful break-aligned
        ;; anchors (e.g., TimeSignature) for the MetronomeMark
        (not (grob::is-live? (ly:grob-parent grob X)))
        (let* ((system (ly:grob-system grob))
               ;; all the useful grobs inside this system as a list
               (elts (ly:grob-array->list
                      (ly:grob-object system 'elements)))
               ;; get the BreakAlignment at the start of the
               ;; system so we can use its extent to translate the
               ;; mark away from prefatory matter       
               (alignment (car (filter
                                (lambda (g)
                                  (grob::has-interface g 
'break-alignment-interface))
                                elts)))
               ;; get length of BreakAlignment relative to system and add a 
little
               ;; padding to ensure skylining doesn't push the mark up 
               (offset (+ 0.5 (interval-length (ly:grob-extent alignment system 
X)))))

          ;; move MetronomeMark past BreakAlignment
          (ly:grob-translate-axis! grob offset X)))
       ;; call default callback
       (ly:side-position-interface::move-to-extremal-staff grob))
  }
}