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---

平坦なタイ

この関数は Tie.stencil をデフォルトの引数に取り、このデフォルトのステンシルの寸法を基にサイズが計算されます。更なる調整は Tie.details.height-limit や \shape で行うことができます。また、カスタム定義をその場で変更することもできます。

#(define ((flared-tie coords) grob)
   (define (pair-to-list pair)
     (list (car pair) (cdr pair)))

   (define (normalize-coords goods x y dir)
     (map
      (lambda (coord)
        (cons (* x (car coord)) (* y dir (cdr coord))))
      goods))

   (define (my-c-p-s points thick)
     (make-connected-path-stencil points thick 1.0 1.0 #f #f))

   ;; Calling `ly:tie::print` and assigning its return value to a
   ;; variable in this outer `let` triggers LilyPond to position the
   ;; tie, allowing us to extract its extents.  We only proceed,
   ;; however, if the tie doesn't get discarded (for whatever reason).
   (let ((sten (ly:tie::print grob)))
     (if (grob::is-live? grob)
         (let* ((layout (ly:grob-layout grob))
                (line-thickness (ly:output-def-lookup layout
                                                      'line-thickness))
                (thickness (ly:grob-property grob 'thickness 0.1))
                (used-thick (* line-thickness thickness))
                (dir (ly:grob-property grob 'direction))
                (xex (ly:stencil-extent sten X))
                (yex (ly:stencil-extent sten Y))
                (lenx (interval-length xex))
                (leny (interval-length yex))
                (xtrans (car xex))
                (ytrans (if (> dir 0)(car yex) (cdr yex)))
                ;; Add last point.
                (coord-list (append coords '((1.0 . 0.0))))
                (uplist
                 (map pair-to-list
                      (normalize-coords coord-list lenx (* leny 2) dir))))
           (ly:stencil-translate
            (my-c-p-s uplist used-thick)
            (cons xtrans ytrans)))
         '())))

% Define a default tie shape consisting of three straight lines.
#(define flare-tie
   (flared-tie '((0.1 . 0.3) (0.9 . 0.3))))

\relative c' {
  a4~ a
  \once \override Tie.stencil = #flare-tie
  a4~ a \break

  <a c e a c e a c e>~ q
  \once \override Tie.stencil = #flare-tie
  q~ q\break

  <>^\markup \small \typewriter "height-limit = 14"
  \override Tie.details.height-limit = 14
  a'4~ a
  \once \override Tie.stencil = #flare-tie
  a4~ a \break

  <>^\markup \small \typewriter "height-limit = 0.5"
  \override Tie.details.height-limit = 0.5
  a4~ a
  \once \override Tie.stencil = #flare-tie
  a4~ a \break

  \revert Tie.details.height-limit

  <>^\markup \small \typewriter
             "\shape #'((0 . 0) (0 . -1) (0 . -1) (0 . 0))"
  \shape #'((0 . 0) (0 . -1) (0 . -1) (0 . 0)) Tie
  a4~ a
  \once \override Tie.stencil = #flare-tie
  \shape #'((0 . 0) (0 . -1) (0 . -1) (0 . 0)) Tie
  a4~ a \break

  <>^\markup \small \typewriter
             "#(flared-tie '((0.2 . 2) (0.5 . -3) (0.8 . 1))"
  \once \override Tie.stencil =
        #(flared-tie '((0.2 . 2) (0.5 . -3) (0.8 . 1)))
  a4~ a
  <>_\markup \small \typewriter
             "#(flared-tie '((0.5 . 2)))"
  \once \override Tie.stencil = #(flared-tie '((0.5 . 2)))
  a'4~ a
}