Re: multiple TextSpanners per voice

[David Nalesnik]

On Fri, Oct 2, 2015 at 12:09 PM, David Nalesnik <address@hidden>
wrote:

> David,
>
> On Fri, Oct 2, 2015 at 11:26 AM, David Kastrup <address@hidden> wrote:
>
>> David Nalesnik <address@hidden> writes:
>>
>> > Hi all,
>> >
>> > I'm experimenting with a way to support multiple text spanners in a
>> single
>> > voice, using the 'spanner-id property which already enables multiple
>> slurs
>> > and phrasing slurs.
>> >
>> > The attached code works--until the spanners cross a line break.  Then
>> the
>> > order of the spanners is reversed.  I've experimented with different
>> start
>> > and end points of the spanners, reversing lists within the engraver--no
>> > change.
>> >
>> > The second example shows that tweaks can mess up this reversed ordering
>> > even further.
>> >
>> > Does anyone know what is happening here?  I really have no idea :(
>>
>> Sounds like room-saving stacking of elements with equal
>> outside-staff-priority (?).  Perhaps distribute ascending priorities?
>
>
>
Horizontal_bracket_engraver achieves correct ordering of nested brackets
through the side-position-interface array 'side-position-elements.
Brackets closer to the staff are added to the support of brackets further
away.  However, this only works because 'outside-staff-priority is set to
#f by default.  As soon as you set it to a numerical value, chaos ensues:
the initial ordering is flipped AND the brackets flip orientation across
line breaks.  (See attached images.)

Try this code:

\version "2.19.27"

\new Staff {
  \override HorizontalBracket.direction = #UP
  \override HorizontalBracket.thickness = 4
  c
  -\tweak color #red
  \startGroup
  -\tweak color #green
  \startGroup d
  -\tweak color #blue
  \startGroup
  e f
  \break
  c d e f
  c\stopGroup d\stopGroup e d\stopGroup
  \bar "||"
  \override HorizontalBracket.outside-staff-priority = 100
  c
  -\tweak color #red
  \startGroup
  -\tweak color #green
  \startGroup d
  -\tweak color #blue
  \startGroup
  e f
  \break
  c d e f
}

\layout {
  \context {
    \Voice
    \consists #"Horizontal_bracket_engraver"
  }
}

%%%%%%%%%%%%%

This must be a bug...

BTW, correct ordering is achieved with the TextSpanner code if the same
approach is taken: any spanner in force is added to the
'side-support-elements of a new spanner.  Again, this works only if
'outside-staff-priority is set to #f.

DN

horizontal-bracket-bug.png
Description: PNG image