Am Fr., 1. Feb. 2019 um 20:19 Uhr schrieb Malte Meyn <lilyp...@maltemeyn.de>:
>
> Am 01.02.19 um 18:42 schrieb Aaron Hill:
> > On 2019-02-01 9:04 am, Malte Meyn wrote:
> >> Am 01.02.19 um 16:53 schrieb Aaron Hill:
> >>> "" is already a valid bar line that has an empty glyph, so just
> >>> extend that one:
> >>>
> >>> %%%%
> >>> \version "2.19.82"
> >>>
> >>> \defineBarLine "-span" #'("|" "|" "|")
> >>> \layout { \context { \Score defaultBarType = "-span" } }
> >>> \new StaffGroup << \new Staff \repeat unfold 12 b'4
> >>> \new Staff \repeat unfold 12 b'4 >>
> >>> %%%%
> >>
> >> That’s not enough: #'("|" "|" "|") will make full bar lines at line
> >> breaks. When I try #'("" "" "|") instead, no span bar is printed at
> >> line end. But the following seems to work:
> >
> > I goofed when I posted my solution, as I had intended it to be #'("" ""
> > "|"), since it was meant to be only the span bar.
> >
> >> • in the middle of a line, the staff bar is taken from the name "-m"
> >> and the span bar from the third argument "|"
> >> • at the begin of a line, the second argument is used: "" is an empty
> >> staff bar *with empty span bar* (default for "" bar lines)
> >> • at the end of a line, the first argument is used: "" is not
> >> sufficient here, because the span bar is taken from the "" definition
> >> instead of the third argument; setting the first argument to "-m"
> >> looks into the third argument of this definition.
> >
> > That very much sounds like a bug and should be reported. The final
> > argument is the span setting which should be agnostic of start and end
> > styles and vice versa.
> Hm … I don’t think that this is correct: How about
> \defineBarLine ".|:-||" #'("||" ".|:" ".|")
> ? If the span bar ".|" would be used at all positions, the output at
> line breaks wouldn’t be correct: the "||" bar at the line end would have
> a ".|" span bar too …
I don't see any bug, neither I understand:
> But I don’t know why we have the span bar argument at all then …
Anyway, if a new barline is wished (with a new glyph, like "m"), it
needs to be defined from scratch.
The NR says:
"If additional elements are needed, LilyPond provides a simple way to
define them. For more information on modifying or adding bar lines,
see file ‘scm/bar-line.scm’."
Well, this is not very verbose ... lol ... but to explain it, would
beyond the Notation _Reference_, rather the Extending Manual could be
amended.
We have ‘bar-line-define-bar-glyph.ly’ in the regtests, though.
lilypond.org/doc/v2.19/input/regression/8d/lily-e521e794.ly
(This example avoids caring about span-bars, though, setting span-bars to "")
In short:
A barline-printing-procedure, with the required arguments 'grob' and
'extent' needs to be assigned to a glyph (of string-length 1) via
'add-bar-glyph-print-procedure'.
Then the new barline could be defined via '\defineBarLine' or it's
scheme-equivalent 'define-bar-line' An example:
\version "2.19.82"
#(define (make-foo-bar-line grob extent)
(let* ((stil
(box-stencil
(grob-interpret-markup grob (make-vcenter-markup "FOO"))
0.2 0.1))
(stil-x-extent (ly:stencil-extent stil X)))
;; To get span-bars correct, some moving is needed
(ly:stencil-translate-axis
(ly:make-stencil (ly:stencil-expr stil) stil-x-extent extent)
(interval-center extent)
Y)))
#(add-bar-glyph-print-procedure "f" make-foo-bar-line)
#(define-bar-line "f" "f" "f" "f")
\score {
\new StaffGroup \with { \override SpanBar.color = #red }
<<
\repeat unfold 10 R1
\repeat unfold 10 R1
{
R1
\bar "f"
r1^\markup \raise #20 \null
\repeat unfold 8 R1
}
>>
\layout {
\context {
\Score
defaultBarType = "f"
}
}
}
For the topic of Mensurstriche, Malte already pointed out the howto:
\defineBarLine "-m" #'("-m" "" "|")
Which does not need a new printing procedure, but is an alternative to ""-bar.
Cheers,
Harm
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