%% Generated by lilypond-book.py %% Options: [indent=0\mm,verbatim,doctitle,alt=[image of music],texidoc,line-width=160\mm] \include "lilypond-book-preamble.ly" % **************************************************************** % Start cut-&-pastable-section % **************************************************************** \paper { #(define dump-extents #t) indent = 0\mm line-width = 160\mm force-assignment = #"" line-width = #(- line-width (* mm 3.000000)) } \layout { } % **************************************************************** % ly snippet: % **************************************************************** \sourcefilename "transposing-pitches-with-minimum-accidentals-smart-transpose.ly" \sourcefileline 0 %% Do not edit this file; it is auto-generated from input/new %% This file is in the public domain. \version "2.11.57" \header { doctitlees = "Transportar música con el menor número de alteraciones" texidoces = " Este ejemplo utiliza código de Scheme para forzar las modificaciones enarmónicas de las notas, y asà tener el menor número de alteraciones accidentales. En este caso se aplican las siguientes reglas: @itemize @item Se quitan las dobles alteraciones @item Si sostenido -> Do @item Mi sistenido -> Fa @item Do bemol -> Si @item Fa bemol -> Mi @end itemize De esta forma se selecciona el mayor número de notas enarmónicas naturales. " lsrtags = "pitches" texidoc = "This example uses some Scheme code to enforce enharmonic modifications for notes in order to have the minimum number of accidentals. In this case, the following rules apply: @itemize @item Double accidentals should be removed @item B sharp -> C @item E sharp -> F @item C flat -> B @item F flat -> E @end itemize In this manner, the most natural enharmonic notes are chosen. " doctitle = "Transposing music with minimum accidentals" } % begin verbatim #(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)) music = \relative c' { c4 d e g } \score { \new Staff { \transpose c ais \music \naturalizeMusic \transpose c ais \music \transpose c deses \music \naturalizeMusic \transpose c deses \music } \layout { } } % **************************************************************** % end ly snippet % ****************************************************************