Re: Colored box behind a single note

[Aaron Hill]

On 2019-07-21 10:04 am, Werner LEMBERG wrote:
> Using
>
>   http://lsr.di.unimi.it/LSR/Item?id=1000
>
> I wonder how to get the effect for a single note.  Ideally, I would
> like to write
>
>   \genericSpan <...parameters ...>
>   e\startGroup\endGroup
>
> but since `\genericSpan' uses a `HorizontalBracket' grob, this fails;
> it needs at least two notes.
>
> I wasn't able to find a suitable solution in the web; IMHO, it would
> be a quite useful addition to this snippet.

It appears you could use an invisible grace note as a workaround:

%%%%
\version "2.19.83"
\include "ColorSpanDef.ily"

omitNotes = {
  % Like hideNotes, but removes the stencils instead.
  \override Dots.stencil = ##f
  \override NoteHead.stencil = ##f
  \override NoteHead.no-ledgers = ##t
  \override Flag.stencil = ##f
  \override Beam.stencil = ##f
  \override Stem.stencil = ##f
  \override Accidental.stencil = ##f
  \override Rest.stencil = ##f
  \override TabNoteHead.stencil = ##f
}

graceStartGroup = \grace { \once \omitNotes b'1\startGroup }

\new Staff {
  g'4 a'8[
  \genericSpan #-1 #1 #-1 #1 \colDarkBlue \colLightBlue #0 #0 ##f ##f
  \graceStartGroup b'8]\stopGroup
  c''8[
  \genericSpan #-1 #1 #-1 #1 \colDarkGreen \colLightGreen #0 #0 ##f ##f
  \graceStartGroup b'16\stopGroup
  a'16]
  \genericSpan #-1 #1 #-1 #1 \colDarkRed \colLightRed #0 #0 ##f ##f
  \graceStartGroup b'4\stopGroup
}
%%%%


-- Aaron Hill

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