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 \version "2.11.66"
   4 \header {
   5   lsrtags = "pitches,editorial-annotations,really-cool"
   6   texidoc = "
   7 It is possible to color note heads depending on their pitch and/or their names:
   8 the function used in this example even makes it possible to distinguish enharmonics.
   9 "
  10   doctitle = "Coloring notes depending on their pitch"
  11 } % begin verbatim
  12
  13 %Association list of pitches to colors.
  14 #(define color-mapping
  15   (list
  16     (cons (ly:make-pitch 0 0 0) (x11-color 'red))
  17     (cons (ly:make-pitch 0 0 1/2) (x11-color 'green))
  18     (cons (ly:make-pitch 0 1 -1/2) (x11-color 'green))
  19     (cons (ly:make-pitch 0 2 0) (x11-color 'red))
  20     (cons (ly:make-pitch 0 2 1/2) (x11-color 'green))
  21     (cons (ly:make-pitch 0 3 -1/2) (x11-color 'red))
  22     (cons (ly:make-pitch 0 3 0) (x11-color 'green))
  23     (cons (ly:make-pitch 0 4 1/2) (x11-color 'red))
  24     (cons (ly:make-pitch 0 5 0) (x11-color 'green))
  25     (cons (ly:make-pitch 0 5 -1/2) (x11-color 'red))
  26     (cons (ly:make-pitch 0 6 1/2) (x11-color 'red))
  27     (cons (ly:make-pitch 0 1 0) (x11-color 'blue))
  28     (cons (ly:make-pitch 0 3 1/2) (x11-color 'blue))
  29     (cons (ly:make-pitch 0 4 -1/2) (x11-color 'blue))
  30     (cons (ly:make-pitch 0 5 1/2) (x11-color 'blue))
  31     (cons (ly:make-pitch 0 6 -1/2) (x11-color 'blue))
  32     ))
  33
  34 %Compare pitch and alteration (not octave).
  35 #(define (pitch-equals? p1 p2)
  36   (and
  37     (= (ly:pitch-alteration p1) (ly:pitch-alteration p2))
  38     (= (ly:pitch-notename p1) (ly:pitch-notename p2))))
  39
  40 #(define (pitch-to-color pitch)
  41   (let ((color (assoc pitch color-mapping pitch-equals?)))
  42     (if color
  43       (cdr color))))
  44
  45 #(define (color-notehead grob)
  46   (pitch-to-color
  47     (ly:event-property (ly:grob-property grob 'cause) 'pitch)))
  48
  49 \score {
  50   \new Staff \relative c' {
  51     \override NoteHead #'color = #color-notehead
  52     c8 b d dis ees f g aes
  53   }
  54 }