RE: Questions on beaming and barring

[Nick Payne]

After a bit of fiddling, I arrived at the following which fixes my two problems 
below:

barre = #(define-music-function (parser location padding text shorten adjBreak) 
(number? string? pair? number?) #{
        \once \override TextSpanner #'style = #'line
        \once \override TextSpanner #'font-shape = #'upright
        %draw a bracket edge on RHS
        \once \override TextSpanner #'bound-details #'right #'text = \markup { 
\draw-line #'(0 . -1) }
        \once \override TextSpanner #'padding = $padding
        \once \override TextSpanner #'bound-details #'left #'text = $text
        % set alignment of line with reference to left text
        \once \override TextSpanner #'bound-details #'left 
#'stencil-align-dir-y = #CENTER
        \once \override TextSpanner #'bound-details #'left #'padding = #(car 
$shorten)
        \once \override TextSpanner #'bound-details #'right #'padding = #(cdr 
$shorten)
        % override to remove bracket edge at line breaks
        \once \override TextSpanner #'bound-details #'right-broken #'text = ##f
        % adjust LH end of line when it wraps to following stave
        \once \override TextSpanner #'bound-details #'left-broken #'X = 
#$adjBreak
#})

I thing I haven't managed to fix is that the barring indication looks better if 
both the right- and left-hand ends are extended slightly so that they don't 
both start and finish centred on a note, like so:

\barre #0.0 "CIV" #'(-0.5 . -1) #10

But this means that a barre that wraps to the following stave now extends 
slightly beyond the RH end of the beginning stave. I couldn't find the command 
to fix that.

Nick

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Nick Payne
Sent: Saturday, 20 September 2008 12:16
To: 'Mailinglist lilypond-user'
Subject: RE: Questions on beaming and barring

Thanks again. One final (I hope) question. When the duration of the barre 
causes it to start on one stave and finish on another, that presents two 
problems in the output:

1. On the stave where the barre continues, it starts slightly to the left of 
the very beginning of the stave rather than above the first note on the stave.

2. The bar number at the start of the stave gets moved from its normal position 
to above the line for the barre.

Is there any way around this short of generating the output, seeing whether any 
barres are split across staves, and then manually stopping and starting them to 
avoid this behaviour.

Nick

-----Original Message-----
From: Neil Puttock [mailto:address@hidden Hi Nick,

2008/9/19 Nick Payne <address@hidden>:
> Neil
>
> Thanks. I used your function definition in a short test and it worked 
> just as I wanted. Strangely, however, when I used the function 
> identically in the piece I'm engraving, I just get a dashed line where 
> I should see the barring indication, and I can't see why it works with one 
> and not the other.
>
> Foo.ly and foo.png - test and output as expected.
> Barrios.ly and barrios.png - shows only a dashed line over bar 7 where 
> the barre indication should be.

Since the overrides in \barre use \once, it must be placed directly before the 
note where the text span starts, otherwise all the settings are forgotten:

\barre #0.0 "CIV" #'(0 . 0) <d-4>->\startTextSpan

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