2015-11-22 20:49 GMT+01:00 David Nalesnik <david.nales...@gmail.com>:
>
>
> On Sun, Nov 22, 2015 at 1:21 PM, David Kastrup <d...@gnu.org> wrote:
>>
>>
>> > Is there any way to get the override to be reevaluated with each repeat?
>>
>> No. Written in that manner, the override is evaluated at _input_ time.
>> If you put it in a variable and use that variable 3 times, the colors
>> will be the same each time. What you want is
>>
>> #(define test
>> (let ((colors (circular-list red green blue yellow darkgreen magenta)))
>> (lambda (grob)
>> (let ((color (car colors)))
>> (set! colors (cdr colors))
>> color))))
>>
>> and
>>
>> \override NoteHead.color = #test
>>
>> That way you'll get one call per actual _grob_ since then each grob is
>> then initialized with the callback, and the callback is replaced by the
>> value when the property is first used.
>>
>
> OK, I get it. I need to override NoteHead.color with a procedure, rather
> than the evaluation of the procedure. (And a grob callback must of course
> have a grob argument. Passing my original as a procedure results in an
> error.)
>
> Thanks so much!
>
> David
Though, why it is that arbitrary?
Look at this variation and the attached image:
\version "2.19.29"
#(define test-nmbrs
(let ((nmbrs (circular-list 1 2 3 4)))
(lambda (grob)
(let ((n (car nmbrs)))
(set! nmbrs (cdr nmbrs))
(grob-interpret-markup grob (number->string n))))))
{
\repeat unfold 8 {
\once \override TextScript.stencil = #test-nmbrs
c''4^\markup "foo"
}
}
Cheers,
Harm
_______________________________________________
lilypond-user mailing list
lilypond-user@gnu.org
https://lists.gnu.org/mailman/listinfo/lilypond-user
