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Re: tempo percentage
From: |
David Kastrup |
Subject: |
Re: tempo percentage |
Date: |
Mon, 27 Nov 2017 10:30:41 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux) |
Gianmaria Lari <address@hidden> writes:
> On 27 November 2017 at 09:32, David Kastrup <address@hidden> wrote:
>
>> Gianmaria Lari <address@hidden> 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
- Re: tempo percentage, (continued)
- Re: tempo percentage, David Kastrup, 2017/11/08
- Re: tempo percentage, Gianmaria Lari, 2017/11/26
- Re: tempo percentage, David Kastrup, 2017/11/26
- Re: tempo percentage, Gianmaria Lari, 2017/11/27
- Re: tempo percentage, Gianmaria Lari, 2017/11/27
- Re: tempo percentage, David Kastrup, 2017/11/27
- Re: tempo percentage, Gianmaria Lari, 2017/11/27
- Re: tempo percentage,
David Kastrup <=
- Re: tempo percentage, Gianmaria Lari, 2017/11/27
- Re: tempo percentage, David Kastrup, 2017/11/27