;;;;
;;;; source file of the GNU LilyPond music typesetter
;;;;
-;;;; (c) 2000--2001 Jan Nieuwenhuizen <janneke@gnu.org>
+;;;; (c) 2000--2004 Jan Nieuwenhuizen <janneke@gnu.org>
;;;;
-(define (default-beam-space-function multiplicity)
- (if (<= multiplicity 3) 0.816 0.844)
- )
-
;;
;; width in staff space.
;;
-(define (default-beam-flag-width-function type)
+(define (beam-flag-width-function type)
(cond
((eq? type 1) 1.98)
((eq? type 1) 1.65) ;; FIXME: check what this should be and why
- (else 1.32)
- ))
-
-
-;; This is a mess : global namespace pollution. We should wait
-;; till guile has proper toplevel environment support.
-
-
-;; Beams should be prevented to conflict with the stafflines,
-;; especially at small slopes
-;; ----------------------------------------------------------
-;; ########
-;; ########
-;; ########
-;; --------------########------------------------------------
-;; ########
-;;
-;; hang straddle sit inter hang
-
-;; inter seems to be a modern quirk, we don't use that
-
-;; two popular veritcal beam quantings
-;; see params.ly: #'beam-vertical-quants
-
-
-(define (default-beam-pos-quants beam multiplicity dy staff-line)
- (let* ((beam-straddle 0)
- (thick (ly-get-grob-property beam 'thickness))
- (beam-sit (/ (- thick staff-line) 2))
- (beam-hang (- 1 (/ (- thick staff-line) 2)))
- (quants (list beam-hang))
- )
-
- (if (or (<= multiplicity 1) (>= (abs dy) (/ staff-line 2)))
- (set! quants (cons beam-sit quants)))
- (if (or (<= multiplicity 2) (>= (abs dy) (/ staff-line 2)))
- (set! quants (cons beam-straddle quants)))
- ;; period: 1 (staff-space)
- (append quants (list (+ 1 (car quants))))))
-
-(define (beam-traditional-pos-quants beam multiplicity dy staff-line)
- (let* ((beam-straddle 0)
- (thick (ly-get-grob-property beam 'thickness))
- (beam-sit (/ (- thick staff-line) 2))
- (beam-hang (- 1 (/ (- thick staff-line) 2)))
- (quants '())
- )
- (if (>= dy (/ staff-line -2))
- (set! quants (cons beam-hang quants)))
- (if (and (<= multiplicity 1) (<= dy (/ staff-line 2)))
- (set! quants (cons beam-sit quants)))
- (if (or (<= multiplicity 2) (>= (abs dy) (/ staff-line 2)))
- (set! quants (cons beam-straddle quants)))
- ;; period: 1 (staff-space)
- (append quants (list (+ 1 (car quants))))))
-
+ (else 1.32)))
;; There are several ways to calculate the direction of a beam
;;
;; * majority: number count of up or down notes
;; * mean : mean centre distance of all notes
;; * median : mean centre distance weighted per note
+;;
+;; [Ross] states that the majority of the notes dictates the
+;; direction (and not the mean of "center distance")
+;;
+;; But is that because it really looks better, or because he wants
+;; to provide some real simple hands-on rules?
+;;
+;; We have our doubts, so we simply provide all sensible alternatives.
+
+
+;;
+;
+; DOCME: what goes into this func, what comes out.
(define (dir-compare up down)
(sign (- up down)))
;; arguments are in the form (up . down)
-(define (beam-dir-majority count total)
+(define-public (beam-dir-majority count total)
(dir-compare (car count) (cdr count)))
-(beam-dir-majority '(0 . 0) '(0 . 0))
+(define-public (beam-dir-majority-median count total)
+ "First try majority. If that doesn't work, try median."
+ (let ((maj (dir-compare (car count) (cdr count))))
+ (if (not (= maj 0))
+ maj
+ (beam-dir-median count total))
+ ))
+
-(define (beam-dir-mean count total)
+(define-public (beam-dir-mean count total)
(dir-compare (car total) (cdr total)))
-(define (beam-dir-median count total)
+(define-public (beam-dir-median count total)
(if (and (> (car count) 0)
(> (cdr count) 0))
(dir-compare (/ (car total) (car count)) (/ (cdr total) (cdr count)))
(dir-compare (car count) (cdr count))))
-
-
-;; [Ross] states that the majority of the notes dictates the
-;; direction (and not the mean of "center distance")
-;;
-;; But is that because it really looks better, or because he wants
-;; to provide some real simple hands-on rules?
-;;
-;; We have our doubts, so we simply provide all sensible alternatives.
-
-;; array index multiplicity, last if index>size
-;; beamed stems
-
-
-;; TODO
-;; - take #forced stems into account (now done in C++)?
-;; - take staff-position of chord or beam into account
-