input/regression/beam-concave-chord.ly

   1 \version "2.12.0"
   2
   3 morgenliedBeam = \relative c'' \new Voice {
   4   \time 3/8
   5   % morgenlied
   6   c16 b c e g <e b'> |
   7   \stemUp
   8   c16 b c e g <e b'> |
   9 }
  10
  11 rachmaninovBeams = \relative c' \new Voice {
  12   \voiceOne
  13   \time 4/4
  14   \key c \minor
  15   <c' e c'>8[ <g c g'> <c f> <ees, ees'>] ~
  16   <ees ees'>8[ <c c'> <des des'> <d d'>]
  17 }
  18
  19 horizontalBeams = {
  20   % todo.
  21 }
  22
  23 nonHorizontalBeams = {
  24   \morgenliedBeam
  25   \rachmaninovBeams
  26 }
  27 \layout {
  28   ragged-right = ##t
  29 }
  30
  31 % cut & paste from beam-concave.ly
  32
  33 #(define (<> x y) (not (= x  y)))
  34 mustBeHorizontal = {
  35   \override Staff.Beam #'positions =
  36     #(ly:make-simple-closure
  37       (ly:make-simple-closure
  38        (append
  39         (list chain-grob-member-functions `(,cons 0 0))
  40         (check-slope-callbacks =))))
  41 }
  42 mustNotBeHorizontal = {
  43   \override Staff.Beam #'positions =
  44     #(ly:make-simple-closure
  45       (ly:make-simple-closure
  46        (append
  47         (list chain-grob-member-functions `(,cons 0 0))
  48         (check-slope-callbacks <>))))
  49 }
  50
  51 \new Voice {
  52   \mustBeHorizontal
  53   R1
  54   \horizontalBeams
  55   \mustNotBeHorizontal
  56   \nonHorizontalBeams
  57 }