Re: Direction of tie from Completion_heads_engraver

[Thomas Morley]

2016-02-04 23:57 GMT+01:00 Simon Albrecht <address@hidden>:
> Hello,
>
> is there any possibility to tweak direction of a tie generated via the
> Completion_heads_engraver? The following tweaks both don’t work:
>
> %%%%%%%%%%%
> \version "2.19.36"
> \layout {
>   \context {
>     \Voice
>     \remove "Note_heads_engraver"
>     \consists "Completion_heads_engraver"
>   }
> }
> {
>   \once\override NoteHead.direction = 1
>   \once\override Tie.direction = 1
>   a'\breve
> }
> %%%%%%%%%%
>
> Best, Simon


Hi Simon,

see below, comment inline.

\version "2.19.36"

%% Set TieUp for certain condition(s) in layout.
%% Written as a wrapper for default-direction, i.e `ly:tie::calc-direction'
%% This is only an example, demonstrating the method.
%% Find your own set of conditions.
%% Directly setting Tie.direction in { a'\breve } while using
%% "Completion_heads_engraver" does not work, because there is no Tie to
%% tweak, before the engraver did his work
#(define (my-tie-up grob)
  (let* ((parent (ly:grob-parent grob X))
         (staff-pos (ly:grob-property parent 'staff-position))
         (dur-log (ly:grob-property parent 'duration-log))
         (stem (ly:grob-object parent 'stem))
         (stem-dir (ly:grob-property stem 'direction)))
    (ly:grob-set-property! grob 'direction
      (if (and (= staff-pos -1)
               (= dur-log 0)
               (= stem-dir 1))
               UP
               (ly:tie::calc-direction grob)))))

\layout {
  \context {
    \Voice
    \remove "Note_heads_engraver"
    \consists "Completion_heads_engraver"
    \override Tie.after-line-breaking = #my-tie-up
  }
}

{
  a'\breve
}


HTH,
  Harm