On 24 April 2010 14:30, Neil Puttock <n.putt...@gmail.com> wrote:
> It's currently impossible to do \new Bottom since
> Context::create_new_context () doesn't check whether the context-type
> = 'Bottom, unlike Context::find_create_context ().
Oops, I meant Context::create_unique_context ().
I think I see what's happening in the snippet above:
get_default_interpreter () will only create a new bottom-level context
if it's called via a parent context which has a \defaultchild (i.e., a
Staff-level context). So we can get round this limitation by wrapping
the bottom-level context creation in another context-spec-music block:
\new Voice {
\override NoteHead #'color = #red
c4 d e f
\context Staff
\context Bottom = foo {
\override NoteHead #'color = #green
c4 d e f
}
\context Staff
\context Bottom = bar {
c4 d e f
}
}
I've attached a revised copy of `chord-glissando.ly' which forces each
hidden voice to be a unique bottom-level context.
Cheers,
Neil
\version "2.13.3"
chordGlissando =
#(define-music-function (parser location mus1 mus2) (ly:music? ly:music?)
"Make a glissando between the notes of triads @code{mus1} and @code{mus2}."
(define (add-glissando musChord)
(let ((els (ly:music-property musChord 'elements)))
(ly:music-set-property! musChord 'elements (append els (list (make-music 'GlissandoEvent))))
musChord))
(define (get-notes musicChord)
(filter (lambda(x) (eq? (ly:music-property x 'name) 'NoteEvent))
(ly:music-property musicChord 'elements)))
(define (select-note musChord index)
(let* ((notes (get-notes musChord))
(non-notes (filter (lambda (x)
(not (eq? (ly:music-property x 'name)
'NoteEvent)))
(ly:music-property musChord 'elements)))
(selected-note (list-ref notes index))
(new-els (cons selected-note non-notes))
(new-mus (ly:music-deep-copy musChord)))
(ly:music-set-property! new-mus 'elements new-els)
new-mus))
(define (add-glissando-line mus1 mus2 index)
(context-spec-music
(context-spec-music
(make-sequential-music
(list
hideNotes
(make-grob-property-set 'NoteColumn 'ignore-collision #t)
;; obviously, this isn't equivalent to \once,
;; so could be changed if required
(make-grob-property-set 'Glissando 'thickness 2)
(add-glissando (select-note mus1 (1- index)))
(select-note mus2 (1- index))))
'Bottom (symbol->string (gensym)))
'Staff))
(let* ((notes1 (get-notes mus1))
(notes2 (get-notes mus2))
(note-count (min (length notes1) (length notes2))))
#{
\once \override Glissando #'minimum-length = #5
\once \override Glissando #'springs-and-rods = #ly:spanner::set-spacing-rods
\once \override Glissando #'thickness = #2
<<
\override NoteColumn #'ignore-collision = ##t
{
$(add-glissando mus1)
$mus2
}
$(add-glissando-line mus1 mus2 1)
$(if (> note-count 1) (add-glissando-line mus1 mus2 2))
$(if (> note-count 2) (add-glissando-line mus1 mus2 3))
$(if (> note-count 3) (add-glissando-line mus1 mus2 4))
$(if (> note-count 4) (add-glissando-line mus1 mus2 5))
$(if (> note-count 5) (add-glissando-line mus1 mus2 6))
$(if (> note-count 6) (add-glissando-line mus1 mus2 7))
$(if (> note-count 7) (add-glissando-line mus1 mus2 8))
>>
\revert NoteColumn #'ignore-collision
#}))
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