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Music functions can involve Scheme programming in addition to simple substitution,
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 }
This example may be rewritten to pass in music expressions,
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 }
Next: Void functions, Previous: Paired substitution functions, Up: Music functions
This page is for LilyPond-2.10.33 (stable-branch).