Hi,
I tried to investigate the impacts of an NoteHead-stencil-override,
concerning Accidentals, Stems and LedgerLines using the override below
(representing a more complicated one).
\override NoteHead #'stencil =
#(lambda (grob)
(let* ((stencil (ly:note-head::print grob))
(new-stil (grob-interpret-markup grob
(markup #:box #:pad-markup 2 #:stencil stencil))))
new-stil))
Applying this will move Accidentals and Stems away from the
default-note-head, LedgerLines will be elongated.
With great help from Keith I managed to restore the stem-attachment.
→ http://lists.gnu.org/archive/html/lilypond-user/2012-07/msg00230.html
Now I tried to tackle the LedgerLines. But I found no feasible method
to address the LedgerLines from inside a NoteHead-stencil-override.
And more, it only seems to be possible to manipulate Ledgerlines at
the very start of a voice:
http://lists.gnu.org/archive/html/lilypond-user/2011-04/msg00497.html ff,
or with restarting-staff-trickery.
Well, ok, I tried it the other way. Creating a
LedgerLineSpanner-stencil-override:
I'm able to address the note-heads without problems.
Surprisingly Accidentals and Stems aren't moved, the LedgerLine isn't
elongated (why not?), although I've used the same
stencil-override-code for the note-heads.
Disadvantage:
I have to set \startStaff and \stopStaff which inserts some unwanted
additional space.
%%%%%%%%%%%%%%%%%%
\version "2.15.42"
ls =
\once \override Staff.LedgerLineSpanner #'stencil =
#(lambda (grob)
(let* ((stencil (ly:ledger-line-spanner::print grob))
(default-nh-stil (ly:note-head::print grob))
(new-nh-stil (grob-interpret-markup grob
(markup #:box #:pad-markup 1.7 #:stencil default-nh-stil)))
(note-head-grobs (ly:grob-array->list
(ly:grob-object grob 'note-heads)))
(nh-stencils
(map!
(lambda (x) (ly:grob-set-property! x 'stencil new-nh-stil))
note-head-grobs))
)
nh-stencils
stencil))
%---test
\relative c' {
c4 a
\stopStaff \ls \startStaff
<cis e''>8[ aeses']
\stopStaff \revert Staff.LedgerLineSpanner #'stencil \startStaff
<cis, e''>8 aeses \break
c4 a <cis e''>8[ aeses'] <cis, e''>8 aeses
}
% I added layout and paper to facilitate comparing the lines.
\paper { indent = 0 }
\layout {
\context {
\Staff
\override TimeSignature #'stencil = #empty-stencil
}
}
%%%%%%%%%%%%%%%%%%%%
Questions:
How to avoid or reduce the additional space?
Am I using the side-effects of a bug?
Or is a completely other approach overriding NoteHead-stencils thinkable?
Regards,
Harm
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