On Fri, 7 Dec 2018 at 03:00, Ben <[email protected]> wrote:
> On 12/6/2018 7:49 PM, Peter Crighton wrote:
>
> Hello all,
>
> I have the following (reduced) scenario where one voice has a chord with a
> glissando in it and I want to tweak both glissandos differently. Is it
> possible? The second (currently commented out) tweak is never applied even
> if I comment out the first tweak.
>
> \version "2.19.82"
> one = \relative c'' {
> g2
> -\tweak Y-offset #0.25
> \glissando a
> }
> two = \relative c'' {
> \context Voice = "one" {
> c2
> % this tweak is never applied
> % -\tweak Y-offset #-0.25
> \glissando d
> }
> }
> \new Staff <<
> \new Voice = "one" \one
> \two
> >>
>
> Thanks,
> Peter
>
> A while ago, there was a function created that allowed tweaks like you're
> asking - I think this is what you are looking for :) It should get you
> started.
>
>
> http://lilypond.1069038.n5.nabble.com/How-to-tweak-override-the-individual-Glissando-objects-in-a-chord-td149575.html
>
Thanks, that helped a lot! I boiled it down to:
\version "2.19.82"
glissTweak =
#(define-music-function (parser location lst)(pair?)
#{
\once \override Glissando #'after-line-breaking =
#(lambda (grob)
(let ((gliss-count (ly:grob-property grob 'glissando-index)))
(map (lambda (x)
(let ((gliss-nmbr (car x))
(property-value-alist (cdr x)))
(if (eq? gliss-nmbr gliss-count)
(map
(lambda (y) (ly:grob-set-property! grob (car y) (cdr
y)))
property-value-alist)
#f)))
lst)))
$(make-music 'EventChord 'elements (list (make-music
'GlissandoEvent)))
#})
one = \relative c'' {
\glissTweak #`((0 . ((Y-offset . 0.25)))
(1 . ((Y-offset . -0.25))))
g2 a
}
two = \relative c'' {
\context Voice = "one" {
c2 d
}
}
\new Staff <<
\new Voice = "one" \one
\two
>>
This is lovely and very flexible and does what I need it to do (and more).
But I would also be interested in a more minimal version because I usually
only care about Y-offsets. Preferably something that wouldn’t remove the
\glissandos from the syntax, so I could have something like
\once \override Glissando.Y-offset =
#(lambda (grob) (and
(if (= 0 (ly:grob-property grob 'glissando-index)) '0.25)
(if (= 1 (ly:grob-property grob 'glissando-index)) '-0.25)))
<g c>2\glissando <a d>
if only that would work. It probably won’t be as easy as that. But my
Scheme is very modest, and I don’t even know where to begin with something
like that. Any ideas?
--
Peter Crighton | Musician & Music Engraver based in Mainz, Germany
http://www.petercrighton.de
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