Hello Arjen, I’m wondering if in your case it ight be beneficial to not create two Hairpins, but rather a special case stencil like this:
%%%%%
#(define (ly:expr-hairpin::print grob)
(let* ((orig (ly:hairpin::print grob))
(sp (ly:grob-property grob 'shorten-pair '(0 . 0)))
(spl (car sp))
(spr (cdr sp))
(t (ly:grob-property grob 'text #f))
(tst (if t (grob-interpret-markup grob t) empty-stencil))
(tst (ly:stencil-translate-axis
(ly:stencil-aligned-to (ly:stencil-aligned-to tst Y CENTER) X
CENTER)
(interval-center (ly:stencil-extent orig X))
X))
(bp (ly:grob-property grob 'gap 0.3))
(bp2 (ly:grob-property grob 'bound-padding 0.3))
(len (interval-length (ly:stencil-extent orig X)))
(pad (if t (* 2 bp2) bp))
(shorten (/ (+ len pad (interval-length (ly:stencil-extent tst X)))
2))
(st1 #f)
(st2 #f))
(ly:grob-set-property! grob 'shorten-pair (cons spl (+ spr shorten)))
(ly:grob-set-property! grob 'grow-direction RIGHT)
(set! st1 (ly:hairpin::print grob))
(ly:grob-set-property! grob 'shorten-pair (cons (+ spl shorten) spr))
(ly:grob-set-property! grob 'grow-direction LEFT)
(set! st2 (ly:hairpin::print grob))
(ly:grob-set-property! grob 'shorten-pair sp)
(ly:grob-set-property! grob 'grow-direction RIGHT)
(ly:stencil-add st1 st2 tst)))
expr = -\tweak stencil #ly:expr-hairpin::print -\<
{
2\expr 2\!
2\mp\expr 2\!
1\mp\tweak text \markup\dynamic f \expr 1 1 \!
}
%%%%%
Cheers,
Valentin
Am Sonntag, 24. September 2023, 16:58:18 CEST schrieb Arjen:
> Hi,
>
> I'm trying to place symmetrical hairpins under a bar, but it turns out
> that the left (crescendo) hairpin is longer than the right
> (descrescendo) hairpin.
> MWE:
> \version "2.24.1"
> \new Voice \relative <<
> { c'2 c2 }
> { s2\< s2\> <>\! }
>
>
> Tweaking with the lengths of the spacers turns out very difficult and
> results in hairpins at unequal vertical positions:
> \version "2.24.1"
> \new Voice \relative <<
> { c'2 c2 }
> { s4...\< s32\! s2\> <>\! }
>
>
> And sometimes I need an absolute dynamic in front of the hairpins, in
> which case the left hairpin becomes very small:
> \version "2.24.1"
> \new Voice \relative <<
> { c'2 c2 }
> { s4...\pp\< s32\! s2\> <>\! }
>
>
> Is there an (hopefully easy) way to give both hairpins equal size and
> vertical alignment, regardless of the presence of an absolute dynamic in
> front?
>
> Regards,
> Arjen
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