input/lsr/coloring-notes-depending-on-their-pitch.ly

   1 %% Do not edit this file; it is auto-generated from input/new
   2 %% This file is in the public domain.
   3 %% Note: this file works from version 2.12.0
   4 \version "2.13.1"
   5 \header {
   6   lsrtags = "pitches,editorial-annotations,really-cool"
   7   texidoc = "
   8 It is possible to color note heads depending on their pitch and/or their names:
   9 the function used in this example even makes it possible to distinguish enharmonics.
  10 "
  11   doctitle = "Coloring notes depending on their pitch"
  12 } % begin verbatim
  13
  14 %Association list of pitches to colors.
  15 #(define color-mapping
  16   (list
  17     (cons (ly:make-pitch 0 0 0) (x11-color 'red))
  18     (cons (ly:make-pitch 0 0 1/2) (x11-color 'green))
  19     (cons (ly:make-pitch 0 1 -1/2) (x11-color 'green))
  20     (cons (ly:make-pitch 0 2 0) (x11-color 'red))
  21     (cons (ly:make-pitch 0 2 1/2) (x11-color 'green))
  22     (cons (ly:make-pitch 0 3 -1/2) (x11-color 'red))
  23     (cons (ly:make-pitch 0 3 0) (x11-color 'green))
  24     (cons (ly:make-pitch 0 4 1/2) (x11-color 'red))
  25     (cons (ly:make-pitch 0 5 0) (x11-color 'green))
  26     (cons (ly:make-pitch 0 5 -1/2) (x11-color 'red))
  27     (cons (ly:make-pitch 0 6 1/2) (x11-color 'red))
  28     (cons (ly:make-pitch 0 1 0) (x11-color 'blue))
  29     (cons (ly:make-pitch 0 3 1/2) (x11-color 'blue))
  30     (cons (ly:make-pitch 0 4 -1/2) (x11-color 'blue))
  31     (cons (ly:make-pitch 0 5 1/2) (x11-color 'blue))
  32     (cons (ly:make-pitch 0 6 -1/2) (x11-color 'blue))
  33     ))
  34
  35 %Compare pitch and alteration (not octave).
  36 #(define (pitch-equals? p1 p2)
  37   (and
  38     (= (ly:pitch-alteration p1) (ly:pitch-alteration p2))
  39     (= (ly:pitch-notename p1) (ly:pitch-notename p2))))
  40
  41 #(define (pitch-to-color pitch)
  42   (let ((color (assoc pitch color-mapping pitch-equals?)))
  43     (if color
  44       (cdr color))))
  45
  46 #(define (color-notehead grob)
  47   (pitch-to-color
  48     (ly:event-property (ly:grob-property grob 'cause) 'pitch)))
  49
  50 \score {
  51   \new Staff \relative c' {
  52     \override NoteHead #'color = #color-notehead
  53     c8 b d dis ees f g aes
  54   }
  55 }