Re: Center graphical markup on staff

[Aaron Hill]

On 2021-06-21 5:31 pm, Nuno Trocado wrote:
> Hi everyone!
> How can I have the wiggly line in the example below centered inside the 
> staff?
> Thanks,
> Nuno
>
> \score {
>   \relative c' {
>     c4 d
>     s-\markup \override #'(height . 2) \draw-squiggle-line #1 #'(8 . 0) 
> ##f
>   }
> }

While you could play around with negative padding to get the TextScript 
to overlap the staff, I would recommend hijacking something already on 
the staff, such as a rest:

%%%%
markupStencil =
#(define-music-function
 (markup music)
 (markup? ly:music?)
 (define (proc grob)
  (let* ((sten (grob-interpret-markup grob markup))
         (xex (ly:stencil-extent sten X)))
   (ly:grob-set-property! grob 'minimum-X-extent xex)
   (ly:grob-set-property! grob 'stencil sten)))
 #{ \tweak before-line-breaking #proc #music #})

squiggle = \markup
 \override #'(height . 2)
 \draw-squiggle-line #1 #'(8 . 0) ##f

\score {
 \relative c' { c4 d \markupStencil \squiggle r }
}
%%%%

-- Aaron Hill