* Documentation/user/changing-defaults.itely (Page layout): new node.

[lilypond.git] / scm / slur.scm

diff --git a/scm/slur.scm b/scm/slur.scm
index bec4ae0e26d834e6101568c8745e61f5ae72adf3..73e087db0f3e8483bfa3e4b892fe5415aa0c4b1e 100644 (file)
--- a/scm/slur.scm
+++ b/scm/slur.scm
@@ -3,83 +3,68 @@
 ;;;;
 ;;;; source file of the GNU LilyPond music typesetter
 ;;;; 
-;;;; (c) 2000--2002 Jan Nieuwenhuizen <janneke@gnu.org>
+;;;; (c)  2000--2004 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;;;
 
 (define (attached-to-stem slur dir)
-  (let* ((note-columns (ly-get-grob-property slur 'note-columns))
-        (col (if (= dir 1) (car note-columns) (car (reverse note-columns))))
-        (stem (ly-get-grob-property col 'stem)))
+  (let* ((note-columns (ly:grob-property slur 'note-columns))
+        (col (if (= dir RIGHT)
+                 (car note-columns)
+                 (car (last-pair note-columns))))
+        (stem (ly:grob-property col 'stem)))
     (and
-     (eq? col (ly-get-spanner-bound slur dir))
-     stem
-     (ly-get-grob-property stem 'heads))))
+     (eq? col (ly:spanner-get-bound slur dir))
+     ;(ly:grob? stem)
+     ;(pair?  (ly:grob-property stem 'heads))
+
+     )))
 
 
-;; Slur-extremity-rules is a list of rules.  Each rule is a pair 
-;; (fuction . attachment), where function takes two arguments,
-;; the slur and the direction of the attachment.
-;;
-;; The rules are tried starting from the car of this list.  If the
-;; function part (car) evaluates to #t, the corresponding
-;; attachment (cdr) is used for the slur's dir.  Otherwise, the next
-;; rule is tried.
 ;;
 ;; Currently, we have attachments:
 ;;
 ;;    'head 'along-side-stem 'stem 'loose-end
 ;;
-
-(define default-slur-extremity-rules
-  (list
-
-   ;; (cons (lambda (slur dir) (begin (display "before sanity check") (newline))#f) #f)
-
-   ;; urg: don't crash on a slur without note-columns
-   (cons (lambda (slur dir)
-          (< (length (ly-get-grob-property slur 'note-columns)) 1)) 'head)
-
-   ;; (cons (lambda (slur dir) (begin (display "before loose-end") (newline))#f) #f)
-   (cons (lambda (slur dir) (not (attached-to-stem slur dir)))  'loose-end)
-
-   ;; (cons (lambda (slur dir) (begin (display "before head") (newline))#f) #f)
-
-   (cons (lambda (slur dir)
-          ;; urg, code dup
-          (let* ((note-columns (ly-get-grob-property slur 'note-columns))
-                 (col (if (= dir 1) (car note-columns) (car (reverse note-columns))))
-                 (stem (ly-get-grob-property col 'stem)))
-            (and stem
-                 (not (= (ly-get-grob-property slur 'direction) 
-                         (ly-get-grob-property stem 'direction))))))  'head)
-
-   ;; (cons (lambda (slur dir) (begin (display "before stem") (newline))#f) #f)
-
-   (cons (lambda (slur dir)
-          ;; if attached-to-stem
-          (and (attached-to-stem slur dir)
-               ;; and got beam
-               ;; urg, code dup
-               (let* ((note-columns (ly-get-grob-property slur 'note-columns))
-                      (col (if (= dir 1) (car note-columns) (car (reverse note-columns))))
-                      (stem (ly-get-grob-property col 'stem)))
-                 (and stem
-                      (ly-get-grob-property stem 'beam)
-                      ;; and beam on same side as slur
-                      (let ((beaming (ly-get-grob-property stem 'beaming)))
-                        ;; (display "beaming (") (display dir) (display "): ") (write beaming) (newline)
-                        (if (pair? beaming)
-                            (>= (length (if (= dir -1) (cdr beaming) (car beaming)))
-                               1)
-                            #f))))))
-        'stem)
-
-   ;; (cons (lambda (slur dir) (begin (display "before loose-end") (newline))#f) #f)
-   (cons (lambda (slur dir) (not (attached-to-stem slur dir)))  'loose-end)
-   ;; (cons (lambda (slur dir) (begin (display "after loose-end") (newline))#f) #f)
-
-   ;; default case, attach to head
-   (cons (lambda (x y) #t)  'head)
+(define (calc-slur-extremity slur dir)
+  (let* ((note-columns (ly:grob-property slur 'note-columns))
+        (col (if (= dir 1)
+                 (car note-columns)
+                 (car (last-pair note-columns))))
+        (stem (ly:grob-property col 'stem))
+        (beaming (if (and (ly:grob? stem)
+                          (ly:grob? (ly:grob-property stem 'beam)))
+                     (ly:grob-property stem 'beaming)
+                     '(() . ())))
+        (one-side-beaming (if (= dir RIGHT)
+                              (car beaming)
+                              (cdr beaming)))
+                     
+        )
+
+   (cond
+    ((< (length note-columns) 1) 'head)
+    ((not (attached-to-stem slur dir))
+
+     'loose-end)
+    ((and stem
+         (not (equal? (ly:grob-property slur 'direction) 
+                      (ly:grob-property stem 'direction))))  'head)
+    ((and (memq (ly:spanner-get-bound slur dir)
+               (ly:grob-property slur 'note-columns))
+         (ly:grob? stem)
+
+         ;; slur would go under beam for 'head
+         (> (length one-side-beaming ) 0)
+         ;; and beam on same side as slur
+         (equal?
+          (ly:grob-property stem 'direction)
+          (ly:grob-property slur 'direction))
+         )
+     'stem)
+    ((not (attached-to-stem slur dir))
+     'loose-end)
+    (else
+     'head))
    ))