Re: Problems with chord glissandos with articulations and tablature

[Carl Sorensen]

On 4/15/10 9:09 PM, "Bernardo Barros" <address@hidden> wrote:

> Thanks a lot, Carl.
> 
> Let me know if you make this work with any number of notes.
> 
> I'm sure that would be a great feature to add to the next version of
> Lilypond. 
> 
> I'm new to Lilypond, but I'm finding a pretty good programme. 
> I'm a composer and I'm checking this kind of thing to be sure I can work also
> with big projects.
> This was one of the things that made me scared, but not anymore with this
> solution.
> 
> 

Well, I thought I could put it away, but I couldn't....

Here's a copy of chordGlissando that automatically detects chord lengths and
creates glissandos for chords of up to 8 notes.  And if one wanted to add to
that limit, it would be trivial to do so.

HTH,

Carl

%%%%% Start cut and paste

\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)
    #{
       \new Voice {
         \hideNotes
         \once \override Glissando #'thickness = #2
         $(add-glissando (select-note mus1 (1- index)))
         $(select-note mus2 (1- index))
       }
    #})

  (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
     <<
       {
         $(add-glissando mus1)
         $mus2
       }
       $(if (> note-count 1) (add-glissando-line mus1 mus2 1))
       $(if (> note-count 2) (add-glissando-line mus1 mus2 2))
       $(if (> note-count 3) (add-glissando-line mus1 mus2 3))
       $(if (> note-count 4) (add-glissando-line mus1 mus2 4))
       $(if (> note-count 5) (add-glissando-line mus1 mus2 5))
       $(if (> note-count 6) (add-glissando-line mus1 mus2 6))
       $(if (> note-count 7) (add-glissando-line mus1 mus2 7))
    >>
  #}))


\relative c' {
 \new Staff  {
   d8 [ \chordGlissando <c e g>16 <d f a>] e4 <e g c> d |
   \chordGlissando <c e g>4 <e c f> \chordGlissando <c e g> <d f a> |
   \chordGlissando <c e>4 <e g>4
   \chordGlissando <c e g c>4 <e g c e>4
 }
}