2015-12-19 23:43 GMT+01:00 Kieren MacMillan <kieren_macmil...@sympatico.ca>:
> Hello all, > > The final line of the song I’m currently engraving looks like this: > > Questions: > > 1. How could I [best?] code this so that the OttavaBracket starts close to > the top of the staff at the beginning of m. 31 (the Ab), angles upward at > the third quarter of m. 33 (the Db), and then flattens out again for the > last two triplet-eighths (the high Bb)? > > 2. Can this kind of “multi-segment” OttavaBracket (or, more generally, > spanner) be automated and/or sugar-i-fied? > > Thanks for any hints/links/help, > Kieren. > <https://lists.gnu.org/mailman/listinfo/lilypond-user> > Hi Kieren, you don't provide any code ;) And I really dislike inline-images. That said, it's not that easy ... Below some code, which hopefully does what you want, though it's a quite terrible user-interface, if one can call it so at all. Every layout-change will likely result in the need of readjusting... At least it works. It would be far simpler if one could add an option to make-path-stencil to draw dashed lines. Like pure postscript in the following markup-example: \markup \postscript #" [0.5 0.5] 0.1 setdash 0 0 moveto 3 0 lineto 5 3 lineto 7 3 lineto 7 2 lineto stroke " But I found no way to do so. Thus I defined `make-dashed-line-stencil' and `make-connected-dashed-line-stencil' first. With `kneed-line' I try to give you a little easier to use code at hand, but I'm really not convinced. Anyway here the code: \version "2.19.32" #(define (make-dashed-line-stencil width startx starty endx endy) "Make a dashed line stencil of given linewidth and set its extents accordingly." (let ((xext (ordered-cons 0 (- endx startx))) (yext (ordered-cons 0 (- endy starty))) (x (- endx startx)) (y (- endy starty))) (ly:make-stencil ;; the numerical values in the line below determine the appearance ;; of the dashes, the last one is the `phase', i.e. where to start ;; the dashed-line (list 'dashed-line width 0.4 0.6 x y 0) ;; 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)) ;xext ;yext ))) #(define (make-connected-dashed-line-stencil points-list thickness) "Connect the given points with dashed-lines" (define (coords->listed-coords coords-list) (map (lambda (x y) (append x y)) (cons (list 0 0) coords-list) coords-list)) (let* ((coords (coords->listed-coords points-list))) (apply ly:stencil-add (map (lambda (coord x-move) (ly:stencil-translate (make-dashed-line-stencil thickness (car coord) (cadr coord) (caddr coord) (cadddr coord)) (cons (car coord) (cadr coord)))) coords (cons 0 (map car coords)))))) #(define ((kneed-line coords start-offset) grob) "Create a (dashed) line for overriding @code{OttavaBracket.stencil} based on a list of @var{coords} in @code{(cons x y)} form. @code{x} is the portion of the width consumed for a given line and @code{y} is the portion of the height. For example, @code{'((0.3 . 0.7) (0.8 . 0.9) (1.0 . 1.0))} means that at the point where the hairpin has consumed 30% of its width, it must be at 70% of its height. Once it is to 80% width, it must be at 90% height. It finishes at 100% width and 100% height. " (define (pair-to-list pair) (list (car pair) (cdr pair))) (define (normalize-coords goods x y) (map (lambda (coord) (cons (* x (car coord)) (* y (cdr coord)))) goods)) (define (my-c-p-s points thick) ;(make-connected-path-stencil ; points ; thick ; 1.0 ; 1.0 ; #f ; #f) (make-connected-dashed-line-stencil points thick) ) ;; outer let to trigger suicide (let ;((sten (ly:line-spanner::print grob))) ((sten (ly:ottava-bracket::print grob))) (if (grob::is-live? grob) (let* ((thick (ly:grob-property grob 'thickness 1)) (thick (* thick (layout-line-thickness grob))) (xex (ly:stencil-extent sten X)) (lenx (- (interval-length xex) (car start-offset))) (yex (ly:stencil-extent sten Y)) (leny (interval-length yex)) (xtrans (car xex)) (ytrans (car yex)) (uplist (map pair-to-list (normalize-coords coords lenx (/ leny 2))))) (ly:stencil-add (ly:stencil-translate (my-c-p-s uplist thick) (cons (+ xtrans (car start-offset)) (+ ytrans (cdr start-offset)))) (grob-interpret-markup grob (ly:grob-property grob 'text)))) '()))) #(define (kneed-spanner buckles height start-offset) (kneed-line `((0 . 0) (,(car buckles) . 0) (,(cadr buckles) . ,height) (1 . ,height) (1 . ,(- height 1))) start-offset)) kneedSpanner = #(define-music-function (parser location buckles height start-offset) (number-list? number? number-pair?) "Returns a kneed dashed line, overriding @code{OttavaBracket.stencil}. Relying on the settings of @code{kneed-spanner} " #{ \override Staff.OttavaBracket.stencil = #(kneed-spanner buckles height start-offset) \override Staff.OttavaBracket.outside-staff-priority = ##f #}) one = { \kneedSpanner #'(0.85 0.9) #3.5 #'(4.5 . 1.6) \key aes \major \ottava #1 \tuplet 6/4 { \change Staff = "down" aes'8[ \change Staff = "up" des''' \change Staff = "down" f'' \change Staff = "up" bes'' \change Staff = "down" ees'' \change Staff = "up" aes''']~ } aes'''4 \tuplet 3/2 { \change Staff = "down" bes'8 f'' \change Staff = "up" des''' } \tuplet 6/4 { \change Staff = "down" b'8[ \change Staff = "up" e''' \change Staff = "down" a'' \change Staff = "up" dis''' \change Staff = "down" fis'' \change Staff = "up" gis'''] } cis''' a''' fis''' b''' \tuplet 6/4 { \change Staff = "down" des''8[ \change Staff = "up" f'''! \change Staff = "down" aes''! \change Staff = "up" ees'''! \change Staff = "down" bes'' \change Staff = "up" bes'''!] } \tuplet 6/4 { des'''![ aes'''! des'''' ees'''' bes'''' aes'''']~ } aes''''1 \bar "|." } << \new Staff { \clef bass \key aes \major aes1~ aes4 r4 r2 R1*2 } \addlyrics { ress. __ } \new PianoStaff << \new Staff = "up" { \tempo "Tempo Primo" 4=108 \one } \new Staff = "down" { \key aes \major s1 s2 r s r R1 } >> >> Nevertheless, hth, Harm
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