input/regression/beam-concave.ly

   1 \version "2.12.0"
   2 \header{
   3
   4   texidoc = "Fully concave beams should be horizontal. Informally spoken,
   5   concave refers to the shape of the notes that are opposite a
   6   beam. If an up-beam has high notes on its center stems, then we call
   7   it concave.
   8
   9   If a beam fails a test, the desired slope is printed next to it.
  10
  11 "
  12 }
  13
  14
  15 resetMeasure = \set Score.measurePosition = #(ly:make-moment 0 1)
  16
  17 %% examples from Ross.
  18 rossFourBeams =\relative c'' {
  19   \time 2/4
  20   c8[ e b c]
  21   b[ c d b]
  22   c[ f b, c]
  23
  24   a[ f a f] a[ a' a, a']
  25   a[ d, e g] a[ f f g]
  26   c,[ b f' e]
  27   b[ e g, e']
  28   c'[ c, c c]
  29   c[ c c c']
  30   f,,[ b a g]
  31   f[g g e]
  32   a[ d, b' g]
  33 }
  34 rossThreeBeams = \relative c'' {
  35   \time 6/8
  36   e[ a, c] f[ d g]
  37   f,[ b g] a[ b f]
  38   d'[ c b a b e]
  39   c[ b a c b a]
  40   d,[ g a g f e ]
  41   a[ g f a g f]
  42   d'[ g, a b c d]
  43   f[ e d c b f']
  44 }
  45
  46 rossBeams = \relative c'' {
  47   \rossFourBeams
  48   \rossThreeBeams
  49 }
  50
  51 \layout{
  52   ragged-right = ##t
  53   #(define debug-beam-quanting #t)
  54 }
  55
  56
  57
  58
  59 #(define (<> x y) (not (= x  y)))
  60 \new Voice {
  61   \override Beam #'positions = #(ly:make-simple-closure
  62                                  (ly:make-simple-closure
  63                                   (append
  64                                    (list chain-grob-member-functions `(,cons 0 0))
  65                                    (check-slope-callbacks =))))
  66   \rossBeams
  67
  68 }