Gianmaria Lari <gianmarial...@gmail.com> writes: > On 27 November 2017 at 09:32, David Kastrup <d...@gnu.org> wrote: > >> Gianmaria Lari <gianmarial...@gmail.com> writes: >> > >> > Another question. It would be also useful to have a function that >> > increase the tempo by a certain quantity (instead of a certain >> > factor). >> > >> > I tried to modify the previous code in many ways using moment-add and >> > make-moment but without success. This is an example that does not work: >> > >> > (ly:moment-add (ly:context-property c 'tempoWholesPerMinute) value) >> > >> > >> > Any suggestion? >> >> Scheme has no types known as "quantity". Neither has LilyPond. You >> don't show how you get at `value'. >> >> <URL:http://lilypond.org/tiny-examples.html> >> > > For example: > > \version "2.19.80" > increaseTempo = > #(define-music-function (value)(number?) #{ > \context Timing \applyContext > #(lambda (c) > (set! (ly:context-property c 'tempoWholesPerMinute) > (ly:moment-add (ly:context-property c 'tempoWholesPerMinute) > value) > )) > #} ) > > > \score { > { > \tempo 4=100 > a b \increaseTempo 50 c' d' > } > \layout {} \midi{} > }
Any reason you don't take the previous working code, just replacing ly:moment-mul with ly:moment-add (and factor with value if you want more readable code, but for the first attempt you can skip this)? -- David Kastrup _______________________________________________ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
