Re: Background Colour

[Jean Abou Samra]

Le 18/05/2021 à 16:38, Lukas-Fabian Moser a écrit :
> > > Seeing the discussion on coloured lyrics, colour this and that, I 
> > > realized that for some parts I do change the Background Colour of 
> > > the clefs maually (using a standard ofice yellow marking (grease) 
> > > pencil each time after an update print. The purpose is to have a 
> > > fast recognition point for the eyes to jump to the next line and/or 
> > > page.
> >
> > How about:
>
> Improved version that only tweaks the stencil after-line-breaking:
>
> \version "2.19"
>
> #(define (positive-number? x) (and (number? x) (positive? x)))
>
> markerPen =
> #(define-music-function
>   (X-padding Y-padding grob-path)
>   ((positive-number? 0.5) (positive-number? 0) key-list?)
>   #{
>     \override #grob-path .layer = -1
>     \override #grob-path .after-line-breaking =
>     #(lambda (grob)
>        (let*
>         ((original (ly:grob-property grob 'stencil))
>          (X-ext (ly:stencil-extent original X))
>          (Y-ext (ly:stencil-extent original Y)))
>         (ly:grob-set-property!
>          grob 'stencil
>          (ly:stencil-add
>           (ly:make-stencil
>            (ly:stencil-expr (stencil-with-color
>                              (ly:round-filled-box
>                               (interval-widen X-ext X-padding)
>                               (interval-widen Y-ext Y-padding)
>                               1)
>                              yellow))
>            empty-interval empty-interval)
>           original))))
>   #})
>
> \new Staff \with {
>   \markerPen Clef
> }
> \relative {
>   c'4 d \once\markerPen 0.5 0.5 Accidental es fis
>   \once \markerPen Staff.BarLine
>   g \markerPen 0.5 0.5 NoteHead g a
> }
>
> While this does not solve the problem of the marking affecting 
> inter-system spacing, at least it now works fine for accidentals.


How about a separate grob with engraver? Try the attached.

> Is there also a possibility to automatically colour the background in 
> Lilypond, or is there a feature wishlist to which I could add this

You could add it at https://gitlab.com/lilypond/lilypond/-/issues

> A variant marking a complete voice in another background colour or 
> only the clef(s) would probably also do.

I have been working on something pretty much like that lately.

> Is there a way to make a color glow from an image? I actually need 
> something of that sort for the colored notes.

With the attached code,

\override TheGrob.highlight-me = ##t

\override TheGrob.highlight-details.stencil = #ly:text-interface::print

\override TheGrob.highlight-details.text = \markup \epsfile #X #2.0 
"path/to/an/EPS/image.eps"

(Adjust the 2.0 to the desired width.)

Best,
Jean

marker.ly
Description: Text Data

marker.pdf
Description: Adobe PDF document