Hi Urs,
On Sat, Sep 28, 2013 at 12:13 PM, Urs Liska <[email protected]> wrote: > Hi, > > I have a 'function' that redefines commands like \slurUp to color the > corresponding grob (highlighting manual interventions during score > development). > > Is it possible to 'catch' instances of grobs whose direction has been set > by the ^ and _ operators and call a music function on the affected object. > I'd like to write > > a^( > > and as a result get > > \once \override Slur #'color = red > a^( > > Any ideas? > I couldn't get any results with a music function, but a little experimenting got me a tiny engraver which responds to the directional operators. Not sure how useful this is, but here goes: \version "2.17.25" #(define (Color_explicit_direction_engraver ctx) (make-engraver (acknowledgers ((slur-interface trans grob source) (let* ((event (event-cause grob)) (dir (ly:event-property event 'direction))) (if (not (null? dir)) (set! (ly:grob-property grob 'color) red))))))) \new Staff { c''^( d'') c''( d'') c''_( d'') <c'' e''>^( <d'' f''>) } \layout { \context { \Staff \consists #Color_explicit_direction_engraver } } %%%%%%%%%%% HTH, David
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