2012/10/26 David Nalesnik <david.nales...@gmail.com>:
> Hi Kevin,
>
> On Thu, Oct 25, 2012 at 4:55 PM, Kevin Patrick Barry <barr...@tcd.ie> wrote:
>> Dear LilyPond users,
>>
>> I would like the markup function \draw-line to produce a dashed line, but I
>> can't find it in the internals reference to see what overrides to use. I
>> tried TextScript #'style, Glissando #'style and \tweak #'style. I'm just
>> fumbling in the dark really; none of the grobs involving lines seem to be
>> it, and the spanner documentation doesn't tell me which either. Perhaps
>> there's some way to change the line-spanner-interface?
>>
>> Thanks in advance,
>> Kevin Barry
>>
>
> I'm not aware of a markup command which draws dashed lines, and it
> appears that \draw-line is tied to a solid line. Its possible,
> however, to adapt the definition of \draw-line (found in
> scm/define-markup-commands.scm) and `make-line-stencil' (in
> scm/stencil.scm) to create a similar command. Here you can control
> the thickness, length of the dashes (by overriding on and off). I'm
> not sure what "phase" is for. Anyway, hope this helps!
>
> \version "2.17.5"
>
> #(define (make-dashed-line-stencil width startx starty endx endy on off phase)
> (let ((xext (cons (min startx endx) (max startx endx)))
> (yext (cons (min starty endy) (max starty endy))))
> (ly:make-stencil
> (list 'dashed-line
> ; thick on off dx dy phase
> width on off (- endx startx) (- endy starty) phase)
> ; Since the line has rounded edges, we have to / can safely add half the
> ; width to all coordinates!
> (interval-widen xext (/ width 2))
> (interval-widen yext (/ width 2)))))
>
> #(define-markup-command (draw-dashed-line layout props dest)
> (number-pair?)
> #:properties ((thickness 1)
> (on 1)
> (off 1)
> (phase 0))
> (let ((th (* (ly:output-def-lookup layout 'line-thickness)
> thickness))
> (x (car dest))
> (y (cdr dest)))
> (make-dashed-line-stencil th 0 0 x y on off phase)))
>
> \markup \draw-dashed-line #'(11 . 0)
> \markup \override #'(off . 4) \override #'(on . 2) \override #'(thickness . 3)
> \draw-dashed-line #'(20 . 0)
>
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Hi David,
you were faster. :)
Nevertheless, here's my slightly different coding (including your examples):
\version "2.16.0"
#(define-markup-command (draw-dashed-line layout props dest)
(number-pair?)
#:category graphic
#:properties ((thickness 1)
(on 1)
(off 1)
(phase 0))
(let* ((th (* (ly:output-def-lookup layout 'line-thickness)
thickness))
(half-thick (/ th 2))
(x (car dest))
(y (cdr dest)))
(ly:make-stencil
(list 'dashed-line th on off x y phase)
(interval-widen (ordered-cons 0 x) half-thick)
(interval-widen (ordered-cons 0 y) half-thick))))
\markup \fill-line {
\column {
\box \draw-dashed-line #'(-15 . 2)
\box \draw-line #'(15 . 2)
}
}
\markup \draw-dashed-line #'(11 . 0)
\markup
\override #'(off . 4)
\override #'(on . 2)
\override #'(thickness . 3)
\draw-dashed-line #'(20 . 0)
@Kevin
See Davids post for explanations.
Regards,
Harm
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