Re: Modified slur stencil with added markup

[Urs Liska]

Hi Torsten,


Am 12.10.2018 um 00:56 schrieb Torsten Hämmerle:
> Hi Urs,
>
> The centering of the slur stencil destroys its alignment (i.e. reference
> point), so I'd just leave it alone and center-align the text by explicitly
> calculating the necessary markup x shift from the stencil extents.
>
>
> %%%%%%%%%%%%%%%%%%
> \version "2.19.82"
>
> annotatedSlur =
> #(define-music-function (padding text) ((number? 1) markup?)
>     #{
>       \once \override Slur.after-line-breaking =
>       #(lambda (grob)
>          (let*
>           ((stencil (ly:slur::print grob))
>            (dir (ly:grob-property grob 'direction))
>            (markup-stencil (grob-interpret-markup grob text))
>            (shift (- (interval-center (ly:stencil-extent stencil X))
>                     (interval-center (ly:stencil-extent markup-stencil X))))
>            (new-stencil
>             (ly:stencil-combine-at-edge
>              stencil
>              Y dir
>              (ly:stencil-translate-axis markup-stencil shift X)
>              padding)))
>           (ly:grob-set-property! grob 'stencil new-stencil)))
>     #})
>
> {
>    \annotatedSlur
>    %\markup \score { c''' }
>    \markup "hin."
>    c''4 ( g' g' c'' )
> }
> %%%%%%%%%%%%%%%%%%
>
> HTH,
> Torsten

Thank you very much, this indeed fixes the horizontal alignment problem 
in a clean and understandable way - although I wouldn't have known how 
to do it. What is 'interval-center'? Grepping the source doesn't show a 
definition, so I'd assume it's in the C++ domain? I haven't found 
anything about that in the documentation (or through Google).

Urs