David,
On Wed, Mar 21, 2012 at 7:54 PM, David Kastrup <d...@gnu.org> wrote:
>
> Possibly this mail got lost, so I rewrite it (code is somewhat different).
>
> Siska Ádám <sa...@sadam.hu> writes:
>
>> Dear List,
>>
>>
>> is there an effective way to separate the pitches and the rhythms in a
>> voice? I'm thinking about something like defining a variable
>> consisting only of rhythms:
>>
>> Rhythm = {
>> \time 4/4
>> 4 4 4. 8
>> 8 8 4 4 8 8
>> 2 4 8 8 ...
>> }
>>
>> and then apply this to different sequences of pitches:
>>
>> Seq1 = {
>> \clef treble
>> c d e f
>> g a g f e d
>> c e g c ...
>> }
>>
>> Seq2 = {
>> \clef bass
>> c b a g
>> f e f g a b
>> c g e c ...
>> }
>
> #(define-public (for-some-music stop? music)
> "Walk through @var{music}, process all elements calling @var{stop?}
> and only recurse if this returns @code{#f}."
> (let loop ((music music))
> (if (not (stop? music))
> (let ((elt (ly:music-property music 'element)))
> (if (ly:music? elt)
> (loop elt))
> (for-each loop (ly:music-property music 'elements))
> (for-each loop (ly:music-property music 'articulations))))))
>
> #(define (extract-all-durations music)
> (map! (lambda (m) (ly:music-property m 'duration))
> (extract-music music
> (lambda (m) (ly:duration?
> (ly:music-property m 'duration))))))
>
> applyRhythm =
> #(define-music-function (parser location p r)
> (ly:music? ly:music?)
> (let ((l (extract-all-durations r)))
> (for-some-music
> (lambda (m)
> (or (null? l)
> (and (ly:duration? (ly:music-property m 'duration))
> (begin
> (set! (ly:music-property m 'duration) (car l))
> (set! l (cdr l))
> #t))))
> p))
> p)
>
> Rhythm = {
> s4 s4 s4. s8
> s8 s8 s4 s4 s8 s8
> s2 s4 s8 s8
> }
>
> SeqI = {
> \clef treble
> c d e f
> g a g f e d
> c e g c
> }
>
> SeqII = {
> \clef bass
> c b a g
> f e f g a b
> c g e c
> }
>
> \new PianoStaff
> << \new Staff \applyRhythm \SeqI \Rhythm
> \new Staff \applyRhythm \SeqII \Rhythm
>>>
Thanks for this! I'll keep it bookmarked.
Janek
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