Re: Directional NoteHead Stencil Support

[David Nalesnik]

Hi,

On Sat, Mar 21, 2015 at 4:32 PM, tisimst <address@hidden> wrote:

You and me both, Pierre. I've tried for hours to find something that works automatically. I've managed to use a single notehead for both up- and down-stem notes, thanks to everyone's help here, but I still have one problem relating to chords. 

If a notehead, in a chord stack, is forced out of the main column (to the right for up-stem chords, to the left for down-stem chords) what property (or relationship between grobs) puts them there? I can't seem to figure it out. 

- Abraham

If  there's a property which indicates on which side of a stem the note falls, I don't find it.  Seems like there definitely should be one!

Anyway, here's a snippet which suggests a possible way to go.  It prints out the X-coordinate of the note heads in a chord, relative to the organizing NoteColumn.

\version "2.19.17"

{

  \override NoteColumn.before-line-breaking = 

  #(lambda (grob)

     (let ((notes (ly:grob-array->list (ly:grob-object grob 'note-heads))))

       (for-each

        (lambda (note)

          (format #t "~a at coordinate: ~a~%"

            (ly:event-property (event-cause note) 'pitch)

            (ly:grob-relative-coordinate note grob X)))

        notes)

       (newline)))

  <c' d' e' g' c'' d''>

  <cis'' fis'' gis''>

}

%%%%

And the output:

#<Pitch c' > at coordinate: 0.0

#<Pitch d' > at coordinate: 1.251178

#<Pitch e' > at coordinate: 0.0

#<Pitch g' > at coordinate: 0.0

#<Pitch c'' > at coordinate: 0.0

#<Pitch d'' > at coordinate: 1.251178

#<Pitch cis'' > at coordinate: 0.0

#<Pitch fis'' > at coordinate: -1.251178

#<Pitch gis'' > at coordinate: 0.0

Hope this helps!!

-David