Re: Function or command to omit only certain accidentals of a chord?

[Stefano Troncaro]

@Jan-Peter

this is a feature I long to implement for quite some time. This means it is not possible with the EE right now.
The following ideas came up to provide a solution: 1. add IDs to certain elements and allow addressing elements b ID. 2. Add tweaks with a predicate, e.g. at moment x, if NoteEvent has pitch cis'' add tweak.

That is going to be a huge improvement!

@David

I have seen no comment whatsoever about what you find wrong with using
\single \omit Accidental in the way I showed in the code example I gave.

I'm sorry, Caagr98 proposed that solution in his/her first message, to which I already replied. But I should have addressed that part of your reply instead of leaving it uncommented. I apologize.

The short explanation is that I need a solution that works with Openlilylib's Edition Engraver and \single \omit Accidental doesn't. This is because the Edition Engraver can't yet insert a tweak inside a chord.

@Thomas

I was not aware that it was possible to write a function inside of a parameter of a grob, and that before-line-breaking and after-line-breaking served this purpose. The documentation describes them as booleans and "dummy properties" so I never payed them mind. I'm truly surprised. When I said that I didn't believe an override would do it I wasn't considering an "intelligent" override. Something like this could actually work!

After looking a bit through the documentation, I found here that the the note-column-interface has a note-heads property, which provides an array of all the note-head grobs of the NoteColumn. I wanted to go through that list and modify the grobs according to their position on the list, but I am unable to get the list in the first place:

\version "2.19.80"
\language "english"

command = {
  \once \override NoteColumn.before-line-breaking =
    #(lambda (this-column)
        (display (ly:grob-property this-column 'note-heads "couldn't find it")))
}

\score {
  \new Staff {
    \new Voice \relative c'' { 
      \key b \minor \accidentalStyle modern
      \partial 4 <as c,> |
      <b b,> \command <a cs,> <g d~> <fs d> 
    }
  }
}

Do you think this is possible?

2018-02-01 18:49 GMT-03:00 Thomas Morley <address@hidden>:

2018-02-01 16:59 GMT+01:00 Stefano Troncaro <address@hidden>:

> Ideally, I wanted a function
> that I could use with the edition-engraver to tweak target elements inside
> chords. I framed the question around accidentals in the post above, but
> ultimately I hoped to be able to use the same function (or a very similar
> one) to tweak ties of specific notes instead of being forced to use one
> override for the whole chord, or to tweak other properties of specific notes
> should the need arise.

Well, we have
(1) override.
Aplied to a chord it will work on all relevant grobs found.
One could define some selection, ofcourse.
Like:
command =
\override NoteHead.before-line-breaking =
  #(lambda (grob)
    (let* ((cause (ly:grob-property grob 'cause))
           (pitch (ly:prob-property cause 'pitch))
           (alteration (ly:pitch-alteration pitch))
           (accidental (ly:grob-object grob 'accidental-grob)))
    (if (and (ly:grob? accidental) (eqv? alteration 1/2))
        (ly:grob-set-property! accidental 'stencil #f))))

But you wrote you would prefer to address specific notes, not the whole chord.
Therefore we have:

(2) tweak
But you didn't like the already proposed
\single \omit Accidental
which _is_ a tweak

(3) context-properties
basically accidentalStayle sets context-properties.
But ofcourse can't change other note-head-properties as you seem to like.


So I'm at a loss guessing what you desire.


Cheers,
  Harm