input/regression/beam-concave.ly

   1 #(ly:set-option 'old-relative)
   2 \version "1.9.0"
   3 \header{
   4
   5 texidoc = "Concave beams should be horizontal. Informally spoken,
   6   concave refers to the shape of the notes that are opposite a
   7   beam. If an up-beam has high notes on its center stems, then we call
   8   it concave.  This example shows borderline cases. Only the beams
   9   that are marked `horiz' should be printed horizontally.  " }
  10
  11
  12 %{
  13  However, what exactly
  14 it is that makes a beam concave is still unclear.
  15
  16 Beams 1 and 3 should be sloped, 2 and 4 should be horizontal.  Two
  17 sane attempts of calculating concaveness of a beam fail to distinguish
  18 beams this way."
  19 %}
  20
  21
  22 \score{
  23   \notes\relative c'{
  24
  25 %% This case seems easy: second beam should be horizontal.
  26
  27     %% SCS-I Menuet I, m15
  28     %% sloped
  29     %% slope = -0.5ss
  30     %% concaveness: 0.06
  31     \clef bass
  32     \time 3/4
  33     \key g\major
  34     a8 g fis e b dis
  35
  36     %% SCS-I Menuet II, m20
  37     %% horizontal
  38     %% slope = 0
  39     %% concaveness: 0.09
  40     \key f\major
  41     fis,^"horiz." a c es d c
  42
  43 %%% Sarabande: the first beam, obviously more concave, is not horizontal,
  44 %%% but is matched with the next beam in the piece: context.
  45
  46     %% Sarabande: m24
  47     %% sloped
  48     %% concaveness: 0.00
  49     \stemUp
  50      d,16-[ a' b cis]
  51
  52     %% Sarabande: m25
  53     %% horizontal
  54     %% concaveness:a: 0.12
  55      a'16-[^"horiz." b c b]
  56
  57 % Hmm.  Concaveness of both: 1.75
  58 %     %% SCS-VI Prelude, m81
  59 %     %% slope = 0.0
  60 %     \stemBoth
  61 %     \key d\major
  62 %      e,8-[ cis a']
  63
  64 %     %% SCS-VI Prelude, m82
  65 %     %% slope = 0.1ss (possibly b.o. context?)
  66 %      g,-[ e' cis]
  67
  68
  69 %%% Han-Wen: this should be concave
  70      a,16-[^"horiz." a' a a]
  71
  72     \clef treble
  73
  74 %%%% This should not be concave (hwn)
  75     \stemUp bes8[  \stemDown d'8 bes8]
  76   }
  77   \paper{
  78     raggedright = ##t
  79   }
  80 }
  81
  82 %% Local variables:
  83 %% LilyPond-indent-level:2
  84 %% End: