Re: Ossia at the first line of a PianoStaff

[Jean Abou Samra]

Le 17/02/2022 à 19:01, Knute Snortum a écrit :
> I have another problem that I'd love help with.  (Sorry for all the
> questions lately.)
>
> The piece of music I'm working on is a piano piece with several ossia
> bars.  I've been researching how to do this and I've come across a
> problem I can't fix.  If the ossia bar is the first bar of a new line,
> the PianoStaff brace and bar span are attached.  In the middle of the
> staff all is fine.
>
> I've attached the code to produce the problem and an image of what it
> produces.  Any help would be greatly appreciated.



The most low-tech fix would be to move the ossia context
out of the PianoStaff:

\version "2.22.1"

ossia = \markup \small \italic "ossia"


<<
  \new Staff = "ossia" \with {
    \remove "Time_signature_engraver"
    \hide Clef
    \hide BarLine
    \override BarLine.allow-span-bar = ##f
    \override KeySignature.stencil = ##f
    \magnifyStaff #2/3
  }
  \relative {
    \stopStaff
    s1
    \key c \minor
    \startStaff ees'4^\ossia g8 f ees2*1/2 \stopStaff
    s1*2
    \startStaff g4 ees8 f g2*1/2 \stopStaff
  }
  \new PianoStaff <<
    \new Staff = "upper" \relative {
      \key c \minor
      c'4 b c2
      ees4 f ees2
      g4 aes g2 % \break
      c4 b c2 \break
      g4 aes g2
      ees4 d c2
    }
    \new Staff = "lower" \relative {
      \key c \minor
      \repeat unfold 24 { \clef bass c4 }
    }
  >>
>>


If you not keen on doing this, here is another solution:

\version "2.23.6"

ossia = \markup \small \italic "ossia"

#(set-object-property! 'system-start-exclude 'backend-type? boolean?)

\layout {
  \context {
    \PianoStaff
    \override SystemStartBrace.before-line-breaking =
      #(lambda (grob)
         (ly:grob-set-object! grob
                              'elements
                              (ly:grob-list->grob-array
                               (filter
                                (lambda (g)
                                  (not (eq? #t (ly:grob-property g 
'system-start-exclude))))
                                (ly:grob-array->list (ly:grob-object 
grob 'elements))))))
     \override SystemStartBrace.collapse-height = #0
  }
}


<<
  \new PianoStaff <<
    \new Staff = "ossia" \with {
      \remove "Time_signature_engraver"
      \hide Clef
      \hide BarLine
      \override BarLine.allow-span-bar = ##f
      \override KeySignature.stencil = ##f
      \magnifyStaff #2/3
      \override StaffSymbol.system-start-exclude = ##t
    }
    { \stopStaff s1*6 }

    \new Staff = "upper" \relative {
      \key c \minor
      c'4 b c2
      <<
        { ees4 f ees2 }
        \context Staff = "ossia" {
          \key c \minor
          \startStaff ees4^\ossia g8 f ees2*1/2 \stopStaff
        }
      >>
      g4 aes g2 % \break
      c4 b c2 \break
      <<
        { g4 aes g2 }
        \context Staff = "ossia" {
          \key c \minor
          \startStaff g4 ees8 f g2*1/2 \stopStaff
        }
      >>
      ees4 d c2
    }

    \new Staff = "lower" \relative {
      \key c \minor
      \repeat unfold 24 { \clef bass c4 }
    }
  >>
>>


The latter requires a development version due to ly:grob-list->grob-array
being a recent addition.

Best,
Jean