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updated files for (doc help) applyMusic -> music functions: smart-transp
From: |
Michael Meixner |
Subject: |
updated files for (doc help) applyMusic -> music functions: smart-transpose.ly |
Date: |
Thu, 8 Jun 2006 09:15:25 +0000 (UTC) |
User-agent: |
Loom/3.14 (http://gmane.org/) |
Here's the last one (hope it's not outdated by another function...)
"smart-transpose.ly"
% ****************************************************************
% Start cut-&-pastable-section
% ****************************************************************
\paper {
#(define dump-extents #t)
indent = 0\mm
line-width = 160\mm
}
\layout {
}
% ****************************************************************
% ly snippet:
% ****************************************************************
\sourcefilename "smart-transpose.ly"
\header {
texidoc="@cindex Smart Transpose
There is a way to enforce enharmonic modifications for notes in order
to have the minimum number of accidentals. In that case, ``Double
accidentals should be removed, as well as E-sharp (-> F), bC (-> B),
bF (-> E), B-sharp (-> C).'', as proposed by a request for a new feature.
In this manner, the most natural enharmonic notes are chosen in this example.
"
}
%
% Modified to use the standard transpose mechanism. The question is
% how useful these enharmonic modifications are. Mats B.
%
% Why not to have a function that minimizes the number of accidentals? -HJJ
% Works also for quarter tones. -HJJ
%
#(define (naturalise-pitch p)
(let* ((o (ly:pitch-octave p))
(a (ly:pitch-alteration p))
(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)))
#(define (naturalise 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) (naturalise x)) es)))
(if (ly:music? e)
(ly:music-set-property!
music 'element
(naturalise e)))
(if (ly:pitch? p)
(begin
(set! p (naturalise-pitch p))
(ly:music-set-property! music 'pitch p)))
music))
music = \relative c' { c4 d e f g a b c }
naturaliseMusic =
#(define-music-function (parser location m)
(ly:music?)
(naturalise m))
\score {
\context Staff {
\transpose c ais \music
\naturaliseMusic \transpose c ais \music
\transpose c deses \music
\naturaliseMusic \transpose c deses \music
}
\layout { ragged-right = ##t}
}
% ****************************************************************
% end ly snippet
% ****************************************************************
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