Re: Whiteout staff lines behind beams

[Jean Abou Samra]

Le 21/12/2022 à 01:26, Abraham Lee a écrit :
> Is there a way to turn the stencil into a composite of the original 
> with a big block of whiteout that follows the entire group's outer 
> skyline so it hides the staff lines? Would be a nice feature, IMO. I 
> know the stems can be "frenched", but would be cool if the staff lines 
> could be instead.



This has become somewhat easier to do in 2.24 with the new skyline 
functions.

\version "2.24"

\layout {
  #(use-modules (ice-9 match)
                (srfi srfi-1))
  \context {
    \Score
    \override Beam.stencil =
      #(grob-transformer
        'stencil
        (lambda (grob orig)
          (define (sanitize lst)
            (filter (match-lambda ((x . y) (and (finite? x) (finite? y))))
                    lst))
          (match-let* (((down . up) (ly:skylines-for-stencil orig X))
                       (down-points (sanitize (ly:skyline->points down X)))
                       (up-points (sanitize (ly:skyline->points up X))))
            (ly:stencil-add
             (stencil-with-color
              (ly:round-polygon
               (append-reverse down-points up-points)
               0.0)
              "white")
             orig))))
    \override Stem.layer = 10
  }
}

\language "english"

\relative {
  \clef bass
  \time 4/4
  f8 g16 a b c df e f e df c b a g f |
  e8 f16 g a b c df e df c b a g f e |
}


Best,
Jean

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