Re: how to detect position of note on stave?

[Graham King]

Many thanks David,
almost there...

On Wed, 2015-01-07 at 18:09 -0600, David Nalesnik wrote:
>     Hi Graham,
>     
>     On Wed, Jan 7, 2015 at 4:39 PM, Graham King <address@hidden> wrote:
> >         I'm trying to replace a note with one of two special glyphs, depending on the note's position on the stave:  if on the third line or above, stem down, otherwise stem up.  Is it possible to extend the following code to detect automatically (and independently of clef or transposition) which glyph should be chosen?
> >         
> >     
>     
>     
>     Sure--try this:

Merged into my original example, to illustrate a problem:

\version "2.19.5"

#(define ((note-head-musicglyph name) grob)
(grob-interpret-markup grob (make-musicglyph-markup name)))
 
\score {
    \shiftDurations #-1 #0 {
        \relative c' {
            \time 4/2 
            c c c c
            \once \override NoteHead #'stencil = 
                #(lambda (grob)
                   (let ((pos (ly:grob-property grob 'staff-position)))
                     (if (>= pos 0)
                         (note-head-musicglyph "noteheads.dM2mensural")
                         (note-head-musicglyph "noteheads.uM2mensural"))))
            c1 }}}

This works beautifully, except when the note is on a ledger line above or below the stave, in which case the ledger line is lost and horizontal spacing goes haywire.  Example attached.

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