Hi Jan-Peter,
On Fri, Jan 4, 2013 at 8:37 AM, Jan-Peter Voigt <[email protected]> wrote:
> Hi David,
>
> yes, stop-translation-timestep is called and so is process-music, but if I
> want to change properties, like in an override, it has to happen in
> start-translation-timestep, or am I missing something?
>
>
I did get results with the following code, which applies an override within
process-music, but the override takes effect in the next timestep.
Furthermore, since the context numbered 2 doesn't exist yet at #<Mom 1/4>
in the first measure, no change happens at #<Mom 1/2>...
Sorry I can't help more.
-David
\version "2.16.0"
#(define (ly:moment=? a b)
(and (not (ly:moment<? a b))
(not (ly:moment<? b a))))
\layout {
\context {
\Voice
\consists #(let ((ccid 1))
(lambda (context)
(let ((id ccid))
(set! ccid (+ 1 ccid))
`((process-music .
,(lambda (trans)
(let ((pos (ly:context-property context 'measurePosition)))
(if (and (ly:moment=? pos (ly:make-moment 1 4))
(= id 2))
(ly:context-pushpop-property context 'NoteHead 'color
red)
(ly:context-pushpop-property context 'NoteHead
'color)))))))))
}
}
\score {
\relative c'' {
c d << { e f e f e f } \\ { c d c d c d } >>
}
}
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