Re: Introduction Bracket glyphs

[Thomas Morley]

Hi all,

2016-06-19 11:55 GMT+02:00 Andrew Bernard <address@hidden>:
> Hi Pierre,
>
> You beat me to it. :-) I would agree with the shape of this solution. Having
> searched the LSR for something similar, don’t you think it would make a good
> candidate for the LSR in fact? These types of brackets are very useful in
> general.

There is
http://lsr.di.unimi.it/LSR/Item?id=843
(which could be rewritten in a more simple way, though)

In general, in the LSR-snippet the brackets are defined using \path,
Pierre combines \draw-line.
Both is tedious, so I defined a markup-command doing this, see below.
Also, both are going for a text-spanner, with the disadvantage not
being able to position the brackets over a bar-line other then by
moving them, with the need to find the values by try and error. And as
soon as the layout changes the values must be reworked...

Thus I refused to define a Spanner, but used RehearsalMark. Ofcourse
equal vertical position over the Staff can't be warranted anymore,
which may be an issue sometimes. More comments inline.

\version "2.18.2"

#(define-markup-command (draw-connected-line layout props pts)(list?)
  #:properties ((thickness 0.1))
  "
A line connecting points

Draws a line connecting points from @var{pts}.
Curves are possible.  @var{thickness} may be customized using an override.
@lilypond[verbatim,quote]
\\markup
  \\draw-connected-line #'((1 1) (2 0) (3 1) (4 0) (1.9 -2.1  2.1 -2.1  0 0))
@end lilypond"
  (make-connected-path-stencil
    pts
    thickness
    1
    1
    #f
    #f))

openBracket = \markup \draw-connected-line #'((-1  0) (-1  -2))
closeBracket = \markup \draw-connected-line #'((1  0) (1  -2))

%% openBracket/closeBracket are used as RehearsalMarks to ensure positioning
%% over bar-lines.  Sometimes with the need to insert \bar ""
%% The RehearsalMark.self-alignment-X needs to be tweaked to get best
%% visual output.

bracketStart = {
  \once \override Score.RehearsalMark.self-alignment-X = #LEFT
  \mark \openBracket
}

bracketStop = {
  \once \override Score.RehearsalMark.self-alignment-X = #RIGHT
  \mark \closeBracket
}

\relative c'' {
  \time 3/4
  \key d \major

  \bar ""
  \bracketStart
  a2 fis4
  a2 fis4
  a( g) b
  e,2 r4
  \bracketStop
  r2.
}


Cheers,
  Harm