Re: Stanzas over staves

[Partitura Organum]

On 18-4-2018 20:26, Helge Kruse wrote:
> Am 18.04.2018 um 12:39 schrieb Engraver:
> > I use "with-dimensions" if I want to place some text over staves. And
> > "\whiteout" can be used to blot out the staff-lines. See attached.
> > It's rather hackish, so I hope the more knowledgeable members of the
> > list have a more elegant solution for you.
> This is one approach I would follow.
> Since this repeats I would like to put this to a scheme construct. But I
> don't have sufficient knowledge. Here is my (failed) try:
>
> %%START
> \version "2.19.65"
>
> narrator =
> #(define-music-function (dim text) (integer? string?)
>     #{
>       s1^\markup
>        \with-dimensions #'(0 . dim) #'(0 . 0)
>        \override #'(line-width . dim)
>        \translate #'(0 . -1.5)
>        \wordwrap {  text }
>     #})
>
>
> \score {
>    \narrator #1  "The message"
> }
> %%END
>
> It looks like the parameter 'dim' can't be used in this way to build a
> valid parameter to with-dimension. Is this true? How to do it correctly?
>
> How could I pass 'dim+2' to the override of line-width?
>
> Regards,
> Helge
>
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My scheme knowledge is very very limited. I just found out one can 
construct a pair in a scheme function like this:

   #(cons a b)

where a and b are the values. So for your function "narrator", this 
would become:

   \with-dimensions #(cons 0 dim)  #'(0 . 0)

I am however lost how to make "\override #'(line-width . dim)" work 
inside this scheme-function.

Regards,
Auke