Re: lilypond-user Digest, Vol 246, Issue 40

[Jean Abou Samra]

Le samedi 13 mai 2023 à 17:30 -0600, Jeff Olson a écrit :

Jean,

I tried adapting your circleB with a fill to do something like staffHighlight but with a more focused spotlight effect, especially for notes outside the staff on ledger lines where staffHighlight ordinarily doesn't go.    Here's my adaptation (with the original stencil last, so the note itself is not obliterated by the fill):

\version "2.24.1"
circleB =
\once \override NoteHead.stencil =
#(grob-transformer
  'stencil
  (lambda (grob original)
    (grob-interpret-markup
     grob
     #{
        \markup \with-outline \stencil #original
        \overlay {
          \align-on-other #X
            #CENTER \stencil #original
            #CENTER \with-color "#fcc" \draw-circle #3.5 #0.1 ##t
          \stencil #original
          }
     #})))

{  \circleB e a d' \circleB g' b' e'' }

But filling the circle obscures the staff and ledger lines (unlike the staffHighlight effect) making the circled note ambiguous (see first staff in image below).

The only workaround I know is to do an overlay of the whole score with its un-decorated self, like this (second staff in image below).

\markup { \overlay {
  \score {  \new Voice { \circleB e a d' \circleB g' b' e'' } }
  \score {  \new Voice { e a d'  g'  b' e'' } }
} }

Here's the image of the two results.  The circle highlight obliterates the ledger and staff lines:

I see the circle also has no extent so it gets clipped in the png.  That I can workaround. 

But how can I get the circle placed behind the staff (as in the second result) without doing an unwieldy overlay of the whole score?

The basic setting to play with is the layer:

\version "2.24.1"

circleB = {
  \once \override NoteHead.stencil =
  #(grob-transformer
    'stencil
    (lambda (grob original)
      (grob-interpret-markup
       grob
       #{
          \markup \with-outline \stencil #original
          \overlay {
            \align-on-other #X
              #CENTER \stencil #original
              #CENTER \with-color "#fcc" \draw-circle #3.5 #0.1 ##t 
            \stencil #original
            }
       #})))
  \override NoteHead.layer = -1
}

{  \circleB e a d' \circleB g' b' e'' }

But you can't set the layer differently for the colored circle and the note head itself if they are part of the same grob, leading to the circle of a note head stomping on another note head as you can see above. You would have to use another grob, e.g.,

\version "2.24.1"

circleB = {
  \balloonGrobText NoteHead #'(0 . 0)
    \markup \with-color "#fcc" \draw-circle #3.5 #0.1 ##t
  \once \override BalloonText.annotation-balloon = ##f
  \once \override BalloonText.layer = -1
}

\new Voice \with {
  \consists Balloon_engraver
}
{  \circleB e a d' \circleB g' b' e'' }

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