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Flat ties: Difference between revisions

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The function takes the default <code>Tie.stencil</code> as an argument, calculating the result relying on the extents of this default.
This snippet provides a function <code>flared-tie</code> to draw a tie that consist of straight lines. It is intended as a replacement for the default tie-drawing function (i.e., a replacement argument for the <code>stencil</code> property of the <code>Tie</code> grob).


Further tweaking is possible by overriding <code>Tie.details.height-limit</code> or with <code>\shape</code>. It is also possible to change the custom definition on the fly.
The argument of <code>flared-tie</code> is a list of coordinate pairs that specify additional points between the first and last point to span up the tie’s lines. The first and last point are identical to the original tie’s start and end point, respectively.  The X&nbsp;and Y&nbsp;coordinate values are multiples of the bounding box length and height of the original tie (also taking care of the tie’s direction); consequently, the first point has coordinates (0,0), and the last point (1,0). 
 
The function <code>flare-tie</code> defines a shorthand for a flat tie. Further tweaking of the shape is possible by overriding <code>Tie.details.height-limit</code> or with <code>\shape</code>. It is also possible to change the custom definition on the fly.


<lilypond version="2.24">
<lilypond version="2.24">
Line 7: Line 9:
   (define (pair-to-list pair)
   (define (pair-to-list pair)
     (list (car pair) (cdr pair)))
     (list (car pair) (cdr pair)))
 
  (define (normalize-coords goods x y dir)
  (define (normalize-coords goods x y dir)
    (map
    (map
       (lambda (coord)
       (lambda (coord)
        ;(coord-scale coord (cons x (* y dir)))
         (cons (* x (car coord)) (* y dir (cdr coord))))
         (cons (* x (car coord)) (* y dir (cdr coord))))
       goods))
       goods))
 
  (define (my-c-p-s points thick)
  (define (my-c-p-s points thick)
    (make-connected-path-stencil
    (make-connected-path-stencil points thick 1.0 1.0 #f #f))
      points
 
      thick
  ;; Calling `ly:tie::print` and assigning its return value to a
      1.0
  ;; variable in this outer `let` triggers LilyPond to position the
      1.0
  ;; tie, allowing us to extract its extents.  We only proceed,
      #f
  ;; however, if the tie doesn't get discarded (for whatever reason).
      #f))
  (let ((sten (ly:tie::print grob)))
    (if (grob::is-live? grob)
  ;; outer let to trigger suicide
        (let* ((layout (ly:grob-layout grob))
  (let ((sten (ly:tie::print grob)))
                (line-thickness (ly:output-def-lookup layout
    (if (grob::is-live? grob)
                                                      'line-thickness))
        (let* ((layout (ly:grob-layout grob))
                (thickness (ly:grob-property grob 'thickness 0.1))
              (line-thickness (ly:output-def-lookup layout 'line-thickness))
                (used-thick (* line-thickness thickness))
              (thickness (ly:grob-property grob 'thickness 0.1))
                (dir (ly:grob-property grob 'direction))
              (used-thick (* line-thickness thickness))
                (xex (ly:stencil-extent sten X))
              (dir (ly:grob-property grob 'direction))
                (yex (ly:stencil-extent sten Y))
              (xex (ly:stencil-extent sten X))
                (lenx (interval-length xex))
              (yex (ly:stencil-extent sten Y))
                (leny (interval-length yex))
              (lenx (interval-length xex))
                (xtrans (car xex))
              (leny (interval-length yex))
                (ytrans (if (> dir 0)(car yex) (cdr yex)))
              (xtrans (car xex))
;; Add last point.
              (ytrans (if (> dir 0)(car yex) (cdr yex)))
(coord-list (append coords '((1.0 . 0.0))))
              (uplist
                (uplist
                 (map pair-to-list
                 (map pair-to-list
                       (normalize-coords coords lenx (* leny 2) dir))))
                       (normalize-coords coord-list lenx (* leny 2) dir))))
          (ly:stencil-translate
  (ly:stencil-translate
    (my-c-p-s uplist used-thick)
      (my-c-p-s uplist used-thick)
    (cons xtrans ytrans)))
    (cons xtrans ytrans)))
        '())))
  '())))


% Define a default tie shape consisting of three straight lines.
#(define flare-tie
#(define flare-tie
  (flared-tie '((0 . 0)(0.1 . 0.2) (0.9 . 0.2) (1.0 . 0.0))))
  (flared-tie '((0.1 . 0.3) (0.9 . 0.3))))
 
\relative c' {
  a4~ a
  \once \override Tie.stencil = #flare-tie
  a4~ a \break


\layout {
  <a c e a c e a c e>~ q
   \context {
   \once \override Tie.stencil = #flare-tie
    \Voice
   q~ q\break
    \override Tie.stencil = #flare-tie
   }
}


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


\relative c' {
  <>^\markup \small \typewriter "height-limit = 0.5"
  a4~a
   \override Tie.details.height-limit = 0.5
   \override Tie.height-limit = 4
   a4~ a
   a'4~a
   \once \override Tie.stencil = #flare-tie
   a'4~a
   a4~ a \break
   <a,, c e a c e a c e>~ q \break


  a'4~a
   \revert Tie.details.height-limit
   \once \override Tie.details.height-limit = 14
  a4~a \break


   a4~a
   <>^\markup \small \typewriter
  \once \override Tie.details.height-limit = 0.5
            "\shape #'((0 . 0) (0 . -1) (0 . -1) (0 . 0))"
  a4~a \break
   \shape #'((0 . 0) (0 . -1) (0 . -1) (0 . 0)) Tie
 
   a4~ a
  a4~a
   \once \override Tie.stencil = #flare-tie
   \shape #'((0 . 0) (0 . 0.4) (0 . 0.4) (0 . 0)) Tie
  \shape #'((0 . 0) (0 . -1) (0 . -1) (0 . 0)) Tie
  a4~a \break
   a4~ a \break
 
   a4~a
   \once \override Tie.stencil =
    #(flared-tie '((0 . 0)(0.1 . 0.4) (0.9 . 0.4) (1.0 . 0.0)))
   a4~a


   a4~a
   <>^\markup \small \typewriter
            "#(flared-tie '((0.2 . 2) (0.5 . -3) (0.8 . 1))"
   \once \override Tie.stencil =
   \once \override Tie.stencil =
    #(flared-tie '((0 . 0)(0.06 . 0.1) (0.94 . 0.1) (1.0 . 0.0)))
        #(flared-tie '((0.2 . 2) (0.5 . -3) (0.8 . 1)))
   a4~a
  a4~ a
  <>_\markup \small \typewriter
            "#(flared-tie '((0.5 . 2)))"
  \once \override Tie.stencil = #(flared-tie '((0.5 . 2)))
   a'4~ a
}
}
</lilypond>
</lilypond>
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