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6.1.4 Mathematics in functions
Las funciones musicales pueden contar con programación de Scheme además de la simple sustitución:
AltOn = #(define-music-function (parser location mag) (number?)
#{ \override Stem #'length = #$(* 7.0 mag)
\override NoteHead #'font-size =
#$(inexact->exact (* (/ 6.0 (log 2.0)) (log mag))) #})
AltOff = {
\revert Stem #'length
\revert NoteHead #'font-size
}
{ c'2 \AltOn #0.5 c'4 c'
\AltOn #1.5 c' c' \AltOff c'2 }
Este ejemplo se puede reescribir de forma que pase expresiones musicales:
withAlt = #(define-music-function (parser location mag music) (number? ly:music?)
#{ \override Stem #'length = #$(* 7.0 mag)
\override NoteHead #'font-size =
#$(inexact->exact (* (/ 6.0 (log 2.0)) (log mag)))
$music
\revert Stem #'length
\revert NoteHead #'font-size #})
{ c'2 \withAlt #0.5 {c'4 c'}
\withAlt #1.5 {c' c'} c'2 }
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