Re: TimeSignatures over BarLines

[Alexander Kobel]

On 2015-05-08 02:29, Thomas Morley wrote:
> 2015-05-07 18:48 GMT+02:00 Alexander Kobel <address@hidden>:
> > Dear all,
> >
> > I'm trying to move time signatures to print over bar lines for a modern
> > piece, to allow for a proportional (or almost proportional) note spacing
> > despite several time changes.
> >
> > The usual approach is to place them over the staff, like here:
> >    http://lsr.di.unimi.it/LSR/Item?id=272
> > However, the full piece has a whole bunch of staves, so vertical space is at
> > a premium; for each staff, the signatures do not fit, and I feel that a
> > single time signature over the score is not enough.
> > Hence, I decided to break the bar line stencil into two short slices, and
> > squeeze the time signature in between.
> >
> > I'm almost there. The missing piece is automatic adjustment of time
> > signatures at the beginning of a system. If realignTimeSignatures in the
> > attached example is delayed by one measure, the default placement of the
> > first time signature is perfect - as usual. However, I could not find a way
> > to do the same for the time signature in the fourth system (other than
> > manually reverting the overrides).
> > I achieve either
> > 1) a nice placement of the in-line signature (with \realignTimeSignatures),
> > but have to shift the begin-of-line ones by some amount and cannot make
> > enough space for them, xor
> > 2) the default position for the begin-of-line signatures (with
> > \realignTimeSignaturesII), but then I cannot position barlines and time
> > signatures on top of each other.
> > Can anyone enlighten me here?
> >
> > Bonus points for someone who can come up with a proper centered alignment of
> > the "4" in the double bar line at the /end/ of the third system...
> >
> >
> > Thanks in advance,
> > Alexander
>
>
>
> Hi,
>
> how about:
> <snip/>
>
> move-time-sig-into-bar-line =
> \override Staff.BarLine.before-line-breaking =

Ahahahaha! Going the other way around. Actually, this is not moving the 
time sig into the bar line, but the bar line into the time signature. 
Good idea; I guess that's also a reason why it can be done in 
before-line-breaking, right?
Anyway, I have to digest this piece of code you gave here. But it works 
like a charm. Amazing!

> [...]
>
> There's a TODO in it ...
> And I'm not sure how the combination of time-sig and (double-)bar-line
> at line-end should look like.
> If the bar-line is really at line-end the time-sig will stick out to
> the right. Is this wanted?

Honestly, I'm not sure yet (just as I have to get used to the entire 
look). But it was my intention. I think of it similar as a staff bracket 
sticking out to the left...
But that I could derive from your snippet - write a before-line-breaking 
for TimeSignature, too, parse the X-parents just as you did for the 
BarLine, and if (= (ly:item-break-dir grob) LEFT) (where grob is the 
time signature), then

(ly:grob-set-property! grob 'space-alist
               `((right-edge fixed-space
                   .
                   ,(/ (- time-sig-length bar-line-length) -2))))


Wonderful. Thanks a lot!


Best,
Alexander