On 4 March 2010 18:39, Caio Barros <[email protected]> wrote:
> Ok, the grid lines seems to align with the NoteHeads, but how do I draw them
> dashed?
There's currently no support for dashed lines, but it's possible to
force grid lines to use a dashed barline via a custom print callback:
#(define-public (grid-line-dashed grob)
(let ((elts (ly:grob-object grob 'elements)))
(if (ly:grob-array? elts)
(let ((common (ly:grob-common-refpoint-of-array grob elts Y))
(iv empty-interval))
(for-each (lambda (idx)
(let ((point (ly:grob-array-ref elts idx)))
(set! iv
(interval-union
iv (ly:grob-extent point common Y)))))
(iota (ly:grob-array-length elts)))
(if (interval-sane? iv)
(let ((thick (* (ly:grob-property grob 'thickness 1)
(ly:staff-symbol-line-thickness grob))))
(set! iv (interval-translate
iv (- (ly:grob-relative-coordinate grob common Y))))
(set! (ly:grob-property grob 'bar-size) (interval-length iv))
(set! (ly:grob-property grob 'glyph-name) "dashed")
(ly:stencil-translate-axis
(ly:bar-line::print grob)
(- (+ (interval-length iv)
(/ (ly:staff-symbol-staff-space grob) 2)))
Y))
empty-stencil))
(begin
(ly:grob-suicide! grob)
'()))))
\layout {
\context {
\Voice
\consists "Grid_point_engraver"
gridInterval = #(ly:make-moment 1 4)
}
\context {
\Score
\consists "Grid_line_span_engraver"
\override GridLine #'stencil = #grid-line-dashed
}
}
\score {
\new ChoirStaff <<
\new Staff \relative c'' {
\stemUp
c4. d8 e8 f g4
}
\new Staff \relative c {
\clef bass
\stemDown
c4 g' f e
}
>>
}
Regards,
Neil
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