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Issue 1178 in lilypond: Measure_grouping_engraver uses non-standard sign


From: lilypond
Subject: Issue 1178 in lilypond: Measure_grouping_engraver uses non-standard signs
Date: Thu, 08 Jul 2010 22:16:11 +0000

Status: Accepted
Owner: ----
Labels: Type-Enhancement Priority-Low

New issue 1178 by Carl.D.Sorensen: Measure_grouping_engraver uses non-standard signs
http://code.google.com/p/lilypond/issues/detail?id=1178

As currently implemented, the measure_grouping_engraver uses a triangle for groups of 3 baseMoments and brackets for groups with lengths other than 3.

This is a mixture of two different styles, according to Read, pp. 177 and 178.

The brackets indicating groups of arbitrary lengths are used instead of changing meters (p. 177); see example 10-27.

The triangles are used as par of a system of graphical symbols that are used to "indicate subdivisions of the measure" (p. 178). This system uses a vertical bar or L-shaped stroke to indicate a group of 1 baseMoment; a rectangle with the top or bottom removed to indicate a group of 2, a triangle to indicate a group of 3, and a square to indicate a group of 4. Read makes no mention of groups larger than 4. (See example 10-30).

Lilypond currently does not have the 1- or 4-beat group symbols. Also, lilypond currently stretches the grouping symbol to cover the entire group, while Read's notation has the symbol cover only the first baseMoment of the group.

Here's a sample LilyPond file (note that it needs the new beatStructure property introduced in 2.13.28) that demonstrates the lilypond output for the equivalent of example 10-30.


\version "2.13.28"

\score {
  \new Voice \relative c'' {
    \time 10/8
    \set Timing.beatStructure = #'(4 2 3 1)
    \repeat unfold 10 { g8 }
  }
  \layout {
    \context {
      \Staff
      \consists "Measure_grouping_engraver"
    }
  }
}


Attachments:
        Example10-27.png  34.2 KB
        beat-patterns.png  7.9 KB
        Example10-30.png  34.9 KB




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