Re: how to get half-bar used in Bach Music?

[Alexander Kobel]

On 2010-11-21 13:55, Marc Mouries wrote:
> thanks Ted, that could do it. The tricky part though is that Bach uses a
> half-bar every other measure.
>
> I ttried this but got 2 issues:
> 1) 5.0 is not the normal height of the bar line. Would you know what it is?
> 2) i put a second override to get a normal bar after a half-bar size but
> the second override seems to override the 1st override ???
>
> \relative c' {
> \override Staff.BarLine #'bar-size = #2.0
> c4 c c c |
> \override Staff.BarLine #'bar-size = #5.0
> c c c c |
> }

Hi, Marc,

halfBar = \once \override Staff . BarLine #'bar-size = #2

relative c' {
  c4 c c c \halfBar |
  c c c c |
}

should give you what you want.  The \once says that this tweak should be 
applied - well, just once.  Thus, there's no need to rewrite the whole 
thing just to get "normal size" bars; if you do not want to use the 
\once however, be sure to check out the \revert command.

An \override without \once affects all objects on the very time you call 
it, and lasts for the later ones.
Thus, your code works as expected, but regardless of the order of | and 
\override, the /second/ call holds for the moment the BarLine gets 
drawn.  The first affects everything from time 0 to just before the end 
of the first measure, but there is no bar line there.


HTH,
Alexander