2 (define (attached-to-stem slur dir)
3 (let* ((note-columns (ly-get-elt-property slur 'note-columns))
4 (col (if (= dir 1) (car note-columns) (car (reverse note-columns))))
5 (stem (ly-get-elt-property col 'stem)))
7 (eq? col (ly-get-spanner-bound slur dir))
9 (ly-get-elt-property stem 'heads))))
12 ;; Slur-extremity-rules is a list of rules. Each rule is a pair
13 ;; (fuction . attachment), where function takes two arguments,
14 ;; the slur and the direction of the attachment.
16 ;; The rules are tried starting from the car of this list. If the
17 ;; function part (car) evaluates to #t, the corresponding
18 ;; attachment (cdr) is used for the slur's dir. Otherwise, the next
21 ;; Currently, we have attachments:
23 ;; 'head 'along-side-stem 'stem 'loose-end
26 (define slur-extremity-rules
28 (cons (lambda (slur dir)
30 (let* ((note-columns (ly-get-elt-property slur 'note-columns))
31 (col (if (= dir 1) (car note-columns) (car (reverse note-columns))))
32 (stem (ly-get-elt-property col 'stem)))
34 (not (= (ly-get-elt-property slur 'direction)
35 (ly-get-elt-property stem 'direction)))))) 'head)
37 (cons (lambda (slur dir)
38 ;; if attached-to-stem
39 (and (attached-to-stem slur dir)
42 (let* ((note-columns (ly-get-elt-property slur 'note-columns))
43 (col (if (= dir 1) (car note-columns) (car (reverse note-columns))))
44 (stem (ly-get-elt-property col 'stem)))
46 (ly-get-elt-property stem 'beam)
47 ;; and beam on same side as slur
48 (let ((beaming (ly-get-elt-property stem 'beaming)))
51 (if (= dir -1) (car beaming) (cdr beaming)))
55 (cons (lambda (slur dir) (not (attached-to-stem slur dir))) 'loose-end)
57 ;; default case, attach to head
58 (cons (lambda (x y) #t) 'head)
62 ;; This list defines the offsets for each type of attachment.
63 ;; The format of each element is
64 ;; (attachment stem-dir * attachment-dir slur-dir)
65 ;; Different attachments have different default points:
67 ;; head: Default position is centered in X, on outer side of head Y
68 ;; along-side-stem: Default position is on stem X, on outer side of head Y
69 ;; stem: Default position is on stem X, at stem end Y
70 (define slur-extremity-offset-alist
72 ((head 1 1) . (-0.25 . 0.2))
73 ((head 1 -1) . (-0.25 . -0.25))
74 ((head -1 1) . (-0.25 . 0.25))
75 ((head -1 -1) . (-0.85 . -0.2))
77 ((stem 1 1) . (0 . 0.5))
78 ((stem -1 -1) . (0 . -0.5))