On Wednesday 20 December 2006 10:58, Mats Bengtsson wrote:
> I agree that the scores that take most time to type in are those that have
> repeated rhythms like
> \times 2/3 {c c c } c4 \times 2/3 {c c c } c4
> or
> c8 c16 c c4 c8 c16 c c4
> especially if these are combined with slurs. It is certainly possible to
> implement your
> own music function that applies a specific rhyhtmic pattern to a set of
> pitches.
> However, this if fairly clumsy to do for the moment. I'm sure that some
> clever
> Scheme hacker can come up with some solution like
> mypattern = #(make-rhythmization #{ c8 c16 c16 c4 #})
> so that
> \mypattern {c d e f }
> results in
> c8 d16 e16 f4
>
> Of course, it would be even better if the function also could produce
> the \pat
> function in input/test/music-box.ly, i.e. where some of the pitches are
> repeated
> in the rhythmic pattern.
You can try this one:
#(define (make-rhythmization pattern)
(define-music-function (parser location music) (ly:music?)
((trans (ly:music-property music 'elements)) pattern)))
It depends on the 'trans' function definition in music-box.ly.
If you think it's a useful tool, then perhaps it could be added to the lily
distribution. I'd prefer some other name though, e.g. make-pattern-function.
It's difficult to spell rhythmization, and the word could mean different
things.
BTW: IWBN to have high-order functions in lily, so we could use a nice syntax
like:
pat = \makePatternFunction { ... }
This would require static typing of music function return values, which
probably would be doable if we implement a proper typing system (e.g., let
the car of the music function signature denote the return type; if that's a
list, it returns a function of the given type).
Ah, another good thing with typed return values, is that we could make the
distinction between post-events and music cleaner. Hrm, that would also
require that the \tweak function is polymorphic in some sense.. perhaps this
is what you meant in your previous mail, Han-Wen?
--
Erik
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