Re: How to tweak X-Y-offset of left Fingerings in a chord

[Jean Abou Samra]

Le 13/04/2021 à 23:18, Thomas Morley a écrit :

> Hi,
>
> let's say I've a chord with Fingerings left.
> Now I want to tweak a certain Fingering a little bit up/down and left/right.
>
> How to do so?
>
> Here a minimal to play with:
>
> {
>   \set fingeringOrientations = #'(left)
>   <c'-3 e'-2>
>
>   %% below does not work
>   \once \override Fingering.Y-offset = 10
>   \once \override Fingering.X-offset = 10
>   <c'-3 e'-2>
>
>   <c'-\tweak Y-offset #-10 -3 e'-\tweak Y-offset #10 -2>
> }
>
> Changing fingeringOrientations is not an option.
> Using extra-offset neither, because the Fingering will be the right
> bound of the FigerGlideSpanner, which would look misplaced then.
>
>
> Any hints?
>
>
> Thanks,
>   Harm
>

Hi,

Something very weird seems to be going
on. Try:

{
  \set fingeringOrientations = #'(left)
  \once \override Staff.FingeringColumn.positioning-done =
    #(lambda (grob)
       (let* ((fingering-array (ly:grob-object grob 'fingerings))
              (fingerings (ly:grob-array->list fingering-array)))
         (for-each
           (lambda (fingering x)
             (ly:message "Before: ~s" (ly:grob-property-data fingering 'X-offset))
             (ly:grob-set-property! fingering 'X-offset x)
             (ly:message "After: ~s" (ly:grob-property-data fingering 'X-offset)))
           fingerings
           '(0 -10))
         #t))
  <c'\tweak X-offset -4 -3 e'-2>
}

This displays

Before: ()

After: 0

Before: ()

After: -10

No X-offset before seems somewhat odd, but why
not. Maybe something that I haven't yet understood
is setting it.

However, the values 0 and -10 have no effect.
Instead, the \tweak takes effect (try changing
the -4), even though the value it gives to the
property is supposed to be overwritten.

This very much reminds me of
https://lists.gnu.org/archive/html/bug-lilypond/2021-01/msg00014.html ...

For X-offset, the following seems to do the trick
as long as the values are negative:

{
  \set fingeringOrientations = #'(left)
  \once \override Staff.FingeringColumn.positioning-done = ##t
  <c'\tweak X-offset -4 -3 e'\tweak X-offset -2 -2>
}

For Y-offset, I haven't found a workaround yet.


Cheers,
Jean