Re: automatic fingering annotation

[David Nalesnik]

Hi Erik,

On Tue, Oct 14, 2014 at 1:28 PM, erik flister <address@hidden> wrote:

thanks a lot david, i learned a lot from studying this!

Glad to hear it!

 

looks like there would be two options to get lilypond to report pitch info:

\void \displayLilyMusic       % types absolute pitches to console
\include "event-listener.ly"  % writes file w/midi numbers

but your example inspired me to figure it out in scheme, see attached.  i would think auto-fingering-diagrams would be of general interest -- is it worth submitting either to the snippet library or the core scm library?

I think this would be a great idea.

 

some questions: 

- how could i pass an argument to the engraver (like 'recorder, to tell it what diagrams to use)?

Add a parameter to the engraver:

autoFingerEngraver=

#(lambda (instrument)

  (lambda (context)

    (make-engraver

      (acknowledgers

        ((note-column-interface trans grob source)

         (let* ((cause (event-cause grob))

                (p     (get-fingering (ly:pitch-semitones (ly:event-property cause 'pitch)))))

                  (if (not (null? p))

                    (ly:grob-set-property! (ly:engraver-make-grob trans 'TextScript cause) 'text

                      #{ \markup \woodwind-diagram #instrument #p #}))))))))

Then you would call it later like this:

 \consists #(autoFingerEngraver 'recorder)

- i can't find doc on make-engraver -- are there any?

No, unfortunately not.  You can find some material on C++ engravers in the Contributor's Guide, but nothing on Scheme engravers.  There are a few in the LSR, and they surface from time to time on the lists.

 

- this method ignored the layout overrides i need (that worked on manually entered markups):

  TextScript.staff-padding

  TextScript.self-alignment-X

  how do i get them back?

Unfortunately, I'm not going to be able to help at the moment.  Your recorder diagrams are still in review, and I find it very difficult to work with your file in LilyDev.  I'll be happy to take another look when your patch is part of a release.

 

- i like your 'display-fingering property, but i removed it for simplicity while trying to learn, i'll add it back...

i also found http://www.lilypond.org/doc/v2.17/Documentation/learning/advanced-tweaks-with-scheme, which seems like it should also work and is simpler than defining a new engraver.  

I used a Scheme engraver because it gives easy access to context properties, and it's straightforward to create new grobs.

Possibly you could do this through a music function.  See the thread on "Handling automatic ottavas" for an example of something similar.

I have to say that, given a choice, I'd rather use an engraver given the complexity of fiddling around with music lists. :)

  

however, i can't figure out how to find the right object/property to give a note/column a markup.  NoteHead.text doesn't do anything.  where do i look this up?

Well, you could override NoteColumn.stencil.  Here's a short example:

\version "2.19.15"

#(define (notehead-stencil grob)

   (ly:stencil-aligned-to

    (ly:stencil-translate-axis

     (grob-interpret-markup grob #{ \markup "foo" #})

     3 Y)

    X CENTER))

{

  \override NoteColumn.stencil = #notehead-stencil

  <c'' e''> <c' e'> <c''' e'''>

}

The example shows the big limitation here, which is that no notice at all is taken of collisions.

 

I'll take a better look later, but I hope this is helpful.

--David