Re: Creating arbitrary/isolated RepeatSlash objects

[Jean Abou Samra]

Le 21/08/2022 à 03:15, Galen Hazelwood a écrit :
> Hello all.
>
> I have another question, this time about percent repeats. I'm 
> repeating a long, complex keyboard figure which extends across both 
> staves, and using a combination of MagnifyMusic reduction and percent 
> repeats to keep things manageable. The only thing is that the repeat 
> slashes only appear on one staff; I'd like to mirror them in the 
> other, just so things look symmetric.
>
> There's a function in the documentation for generating arbitrary 
> percent figures in the score...
> makePercent =
> #(define-music-function (note) (ly:music?)
>     "Make a percent repeat the same length as NOTE."
>     (make-music 'PercentEvent
>                 'length (ly:music-length note)))
> ...so I assumed I could just substitute a RepeatSlashEvent for the 
> Percent Event. Turns out I can't; it compiles fine, but throws an 
> error when I try to use it.
>
> ERROR: Wrong type (expecting exact integer): ()
>
> I could just shove the repeat slashes into the middle between the 
> staves, but I'd rather have them mirrored if I could. Is there some 
> way to make a function like this that works, or is there a completely 
> different path that makes more sense?



In the lower staff, instead of

  s1 s1 s1

use

  \repeat percent 6 { \repeat unfold 16 { s32 } }

You have to use \repeat unfold 16 { s32 } instead of s2 because
the durations inside \repeat percent determine how many slashes
are printed.

Cheers,
Jean