Hi Werner,
On Tue, Feb 3, 2015 at 7:40 AM, Werner LEMBERG <[email protected]> wrote:
>
> Folks,
>
>
> I'm trying to work around an old problem of broken ties in tightly
> setted music: They can degenerate to a dot, having no horizontal
> extensions anymore. Following the example in section `Difficult
> tweaks' of the notation reference (with slight changes to change the
> property for all siblings but the first one), I tried this:
>
> #(define (set-minimum-length grob)
> (let* ((orig (ly:grob-original grob))
> (siblings (if (ly:grob? orig)
> (ly:spanner-broken-into orig)
> '())))
> (if (and (> (length siblings) 1)
> (not (eq? (car siblings) grob)))
> (ly:grob-set-property! grob 'minimum-length 20))))
>
> \paper {
> indent = 0
> line-width = 50\mm
> ragged-right = #f
> }
>
> {
> \override Tie.after-line-breaking = #set-minimum-length
> c''1 ~ \break
> c''1
> }
>
> However, this has no effect. I guess this is because because the
> `after-line-breaking' callback is invoked too late in the formatting
> process.
>
Yes, it appears that 'minimum-length is consulted before line breaking
happens, in the callback for ly:spanner::set-spacing-rods (in
lily/spanner.cc). Spacing rods are created provisionally for broken pieces
which might occur later.
> Is there a possibility to make this work?
>
Don't know. In any case, I think the goal should be to make this work with
an override of 'minimum-length, rather than setting 'minimum-length though
'after-line-breaking. Then this would work with \alterBroken, which would
eliminate the need to write your own "difficult tweak."
I don't know if this is related, but here is a clear bug I discovered when
experimenting with your snippet:
\paper {
line-width = 50\mm
}
{
\override Tie.minimum-length = #40
c''2 ~ c'' ~ \break
c''2 ~ c''
}
The music goes right off the side of the page.
Hope this is useful--
David
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