Mike Solomon-2 wrote:
>
> Hmm...I thought that after-line-breaking would be called after the bounds
> were set, but I was wrong.
>
> Try:
>
> #(define (has-interface? grob interface)
> (member interface
> (assoc-get 'interfaces
> (ly:grob-property grob 'meta))))
>
> #(define (find-system grob)
> (if (has-interface? grob 'system-interface)
> grob
> (find-system (ly:grob-parent grob X))))
>
> #(define (first-musical-column grobl)
> (if (not (eqv? #t (ly:grob-property (car grobl) 'non-musical)))
> (car grobl)
> (first-musical-column (cdr grobl))))
>
> #(define (change-bound grob)
> (let* ((system (find-system grob))
> (cols (ly:grob-array->list (ly:grob-object system 'columns)))
> (musical-column (first-musical-column (reverse cols))))
> (ly:spanner-set-bound! grob RIGHT musical-column)))
>
> #(define (internal-my-callback grob)
> (let* (
> ;; have we been split?
> (orig (ly:grob-original grob))
>
> ;; if yes, get the split pieces (our siblings)
> (siblings (if (ly:grob? orig)
> (ly:spanner-broken-into orig)
> '())))
>
> (if (and (>= (length siblings) 2)
> (not (eq? (car (reverse siblings)) grob)))
> (change-bound grob))))
>
> #(define (my-callback grob)
> (internal-my-callback grob)
> (ly:hairpin::print grob))
>
> {
> a1\break
> \override Hairpin #'stencil = #my-callback
> a\< \repeat unfold 31 { a } \break \key fis \major
> \repeat unfold 32 { a } \break \key ees \major \repeat unfold 42 {a} a\p
> }
>
> It may result in oddities with other grobs that rely on spanner bounds,
> but it should be tame in most situations.
>
> Cheers,
> MS
>
Hi Mike,
now it works as expected, but I found another problem:
Using \> instead of \< looks like succeeding decrescendos and not one
continuous one.
One more question: Would it be possible to increase the control of the
length of the hairpin?
Doing the following at the end of a hairpin allows some more control on
the length of the hairpin. Not so for anywhere in the middle of it..
\relative c' {
\override Hairpin #'stencil = #my-callback
c'1\> c1*5/8 s1*3/8
\break
\key cis\major
d2 e e1*7/8 s1*1/8\!
}
Would any such increased / improved control be feasible in the context
of the solution you developed so far?
Best,
Harm
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