Dear Aaron,
this is brilliant ! I'm impressed as I would never have been able to write
code like this myself.
Plus : your solution is compatible with multiMeasureRests.
Yet another challenge for you though :-) :
In the middle of the piece there is a \bar "|." occurring after the second
beat, and when using your custom engraver this barline becomes invisible.
How can I make it visible again ?
Best regards,
Philippe
Le sam. 27 mars 2021 à 21:52, Aaron Hill <lilyp...@hillvisions.com> a
écrit :
> On 2021-03-27 1:04 pm, Philippe ZELLER wrote:
> > Dear lilypond fellow users,
> > it sometimes occurs in barock music that only every other barline is
> > visible, (see e.g. Haendel's Salomo, choir at the end of Act II ) or
> > that
> > every other barline is printed in reduced size.(see e.g. Bach Mass in
> > H-moll, nr 27 "dona nobis pacem" ).
> > Is there a way to get this result in lilypond ?
> >
> > I first tried
> > \set Score.barLineVisibility = #(every-nth-bar-number-visible 2)
> > that I made up after an equivalent syntax for barNumber, but to no
> > avail.
> > Maybe I didn't put it in the right context ?
> >
> > Finally I used a rather complicated procedure based on
> > global = {
> > \repeat unfold 24 { s2. \once \override Staff.BarLine.transparent
> > =
> > ##t s2. \once \override Staff.BarLine.transparent = ##f }
> > }
> > which works but is not fully compatible, for example it does not work
> > with
> > multiMeasureRests.
> >
> > Many thanks in advance for your suggestions !
>
> An engraver should be able to do the work:
>
> %%%%
> \version "2.22.0"
>
> hideEveryOtherBarLine =
> #(lambda (ctx)
> (define (bar-num)
> (ly:context-property ctx 'currentBarNumber))
> (make-engraver
> (acknowledgers
> ((bar-line-interface trans grob source)
> (if (= 0 (modulo (bar-num) 2))
> (ly:grob-set-property! grob 'transparent #t))))))
>
> \new Staff
> \with { \consists \hideEveryOtherBarLine }
> \repeat unfold 10 { b'1 }
> %%%%
>
>
> -- Aaron Hill
