'Re: Highlight specific pitch(es)'

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List:       lilypond-user
Subject:    Re: Highlight specific pitch(es)
From:       Stephan_SchÃ¶ll <music () gmx ! ch>
Date:       2023-07-28 15:59:53
Message-ID: 67e7d6ba-860c-14ea-8840-53a58de696e4 () gmx ! ch
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Perfectly what I've been looking for. Thanks a lot for the code as well
as for the hint to the callback explanation, Jean!

Am 28.07.2023 um 17:43 schrieb Jean Abou Samra:
>
> Le vendredi 28 juillet 2023 Ã  16:46 +0200, Stephan SchÃ¶ll a Ã©crit  :
>
>> Hi all
>>
>> In order to ease pitch orientation for novice score readers I'd like
>> to highlight the fundamental / key note (tonika) and perhaps the 5th
>> throughout an entire piece. The most obvious marking might be by
>> coloring the note head (and stem).
>>
>> In the following MVE I'd like to highlight alle the c's and g's:
>>
>> \relative c' {      c4 d e c      e f g2 }
>>
> That's a good job for a simple callback.
>
> |\version "2.24.1" \layout { \context { \Score \override
> NoteHead.color = #(lambda (grob) (let* ((pitch (ly:event-property
> (event-cause grob) 'pitch)) (semi (modulo (ly:pitch-semitones pitch)
> 12))) (cond ((eqv? semi 0) "red") ((eqv? semi 7) "blue") (else
> "black")))) } } \relative c' { c d e f g f e d c b a g fis g a b c1 } |
>
> There is a very similar example on
> https://extending-lilypond.gitlab.io/fr/extending/backend.html#understanding-callbacks
>
> HTH,
>
> Jean
>

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    <p>Perfectly what I've been looking for. Thanks a lot for the code
      as well as for the hint to the callback explanation, Jean!<br>
    </p>
    <div class="moz-cite-prefix">Am 28.07.2023 um 17:43 schrieb Jean
      Abou Samra:<br>
    </div>
    <blockquote type="cite"
      cite="mid:37d98f59d567fff3822be2bf914d92ace410bd0d.camel@abou-samra.fr">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <p>Le vendredi 28 juillet 2023 Ã  16:46 +0200, Stephan SchÃ¶ll a
        Ã©crit  :</p>
      <blockquote type="cite">
        <p>Hi all</p>
        <p>In order to ease pitch orientation for novice score readers
          I'd like to
          highlight the fundamental / key note (tonika) and perhaps the
          5th
          throughout an entire piece. The most obvious marking might be
          by
          coloring the note head (and stem).</p>
        <p>In the following MVE I'd like to highlight alle the c's and
          g's:</p>
        <p>\relative c' {
               c4 d e c
               e f g2
          }</p>
      </blockquote>
      <p>That's a good job for a simple callback.</p>
      <pre><code>\version "2.24.1"

\layout {
  \context {
    \Score
    \override NoteHead.color =
      #(lambda (grob)
         (let* ((pitch (ly:event-property (event-cause grob) 'pitch))
                (semi (modulo (ly:pitch-semitones pitch) 12)))
           (cond ((eqv? semi 0)
                  "red")
                 ((eqv? semi 7)
                  "blue")
                 (else "black"))))
  }
}

\relative c' { c d e f g f e d c b a g fis g a b c1 }
</code></pre>
      <p>There is a very similar example on
<a class="moz-txt-link-freetext" \
href="https://extending-lilypond.gitlab.io/fr/extending/backend.html#understanding-cal \
lbacks">https://extending-lilypond.gitlab.io/fr/extending/backend.html#understanding-callbacks</a></p>
  <p>HTH,</p>
      <p>Jean</p>
    </blockquote>
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