Re: drawing a range reguardless of transposition

[Aaron Hill]

On 2019-11-14 8:53 am, Sandro Santilli wrote:
> In order to determine if I'm writing something that can
> be played by an instrument, is there a way to display
> on the score the supported range by that instrument ?
>
> I'd like to have something that doesn't change when I
> transpose, so to know if transpositions are possible
> at all...

You could do something like this:

%%%%
\version "2.19.83"

highlightOutOfRange = #(define-scheme-function
  (color lower upper)
  ((color? red) ly:pitch? ly:pitch?)
  (grob-transformer 'color (lambda (grob orig)
    (let* ((cause (ly:grob-property grob 'cause))
            (pitch (ly:event-property cause 'pitch)))
      (if (or (ly:pitch<? pitch lower) (ly:pitch<? upper pitch))
        color orig)))))

\layout {
  \context { \Voice
    \override NoteHead.color = \highlightOutOfRange c' c''
  }
}

{
  \transpose c g, \fixed c' { c d e f g a b c' }
  \transpose c f \fixed c' { c d e f g a b c' }
}
%%%%

-- Aaron Hill

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