Joseph Wakeling wrote: > Currently Lilypond's transposition is tonal only, with the 'smart > transpose' snippet providing a Scheme function to minimise accidental > use. Unfortunately this function is incompatible with quarter-tone > notation. The attached snippet shows the problem. A quarter-tone > chromatic scale is displayed, first untransposed; then untransposed and > run through the naturalizeMusic function; then transposed a quarter-tone > up; then transposed up and run through naturalizeMusic; and finally, run > through naturalizeMusic and then transposed.
... the attached snippet is now attached. :-P
\version "2.12"
#(define (naturalize-pitch p)
(let ((o (ly:pitch-octave p))
(a (* 4 (ly:pitch-alteration p)))
;; alteration, a, in quarter tone steps,
;; for historical reasons
(n (ly:pitch-notename p)))
(cond
((and (> a 1) (or (eq? n 6) (eq? n 2)))
(set! a (- a 2))
(set! n (+ n 1)))
((and (< a -1) (or (eq? n 0) (eq? n 3)))
(set! a (+ a 2))
(set! n (- n 1))))
(cond
((> a 2) (set! a (- a 4)) (set! n (+ n 1)))
((< a -2) (set! a (+ a 4)) (set! n (- n 1))))
(if (< n 0) (begin (set! o (- o 1)) (set! n (+ n 7))))
(if (> n 6) (begin (set! o (+ o 1)) (set! n (- n 7))))
(ly:make-pitch o n (/ a 4))))
#(define (naturalize music)
(let ((es (ly:music-property music 'elements))
(e (ly:music-property music 'element))
(p (ly:music-property music 'pitch)))
(if (pair? es)
(ly:music-set-property!
music 'elements
(map (lambda (x) (naturalize x)) es)))
(if (ly:music? e)
(ly:music-set-property!
music 'element
(naturalize e)))
(if (ly:pitch? p)
(begin
(set! p (naturalize-pitch p))
(ly:music-set-property! music 'pitch p)))
music))
naturalizeMusic =
#(define-music-function (parser location m)
(ly:music?)
(naturalize m))
microphrase = \relative c'' { geses geseh ges geh g gih gis gisih gisis }
{
\time 9/4
#(set-accidental-style 'dodecaphonic)
\microphrase
\naturalizeMusic { \microphrase }
\transpose c cih { \microphrase }
\naturalizeMusic { \transpose c cih { \microphrase } }
\transpose c cih { \naturalizeMusic { \microphrase } }
}
<<attachment: micro-transpose.png>>
_______________________________________________ lilypond-user mailing list [email protected] http://lists.gnu.org/mailman/listinfo/lilypond-user
