Re: Duplication of pages with slight changes to color of grobs?

[Paul]

Hi Knut,

Nice work on the videos.  Just a couple quick thoughts.

On 07/17/2017 02:30 AM, Knut Petersen wrote:
> B) Is there a practical way to redefine color? within a .ly file in a 
> way that it is recognized
> by lilyponds code?

I take it you have tried this?

#(define (color? ...) ...)

> In the after-line-breaking function I give color the objects ... well, 
> not really:
> I abuse the color property to encode the moment and duration of the
> color change.

Would it help to define your own custom properties (grob or context) to 
avoid overloading the color property.  I have this in my include file 
for Clairnote:

#(let*
  ;; translator-property-description function
  ;; from "scm/define-context-properties.scm" (modified)
  ((context-prop
    (lambda (symbol type?)
      (set-object-property! symbol 'translation-type? type?)
      (set-object-property! symbol 'translation-doc "custom context 
property")
      (set! all-translation-properties (cons symbol 
all-translation-properties))
      symbol))

   ;; define-grob-property function
   ;; from "scm/define-grob-properties.scm" (modified)
   (grob-prop
    (lambda (symbol type?)
      (set-object-property! symbol 'backend-type? type?)
      (set-object-property! symbol 'backend-doc "custom grob property")
      symbol)))

  (context-prop 'myfoo list?)

  (grob-prop 'mybar integer?)
  ;; etc...
  )

Then I can use my custom properties just like the built-in ones.

-Paul