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;;;;
;;;; beam.scm -- Beam scheme stuff
;;;;
;;;; source file of the GNU LilyPond music typesetter
;;;;
;;;; (c) 2000--2006 Jan Nieuwenhuizen <janneke@gnu.org>
;;;;
(define ((check-beam-quant posl posr) beam posns)
"Check whether BEAM has POSL and POSR quants. POSL are (POSITION
. QUANT) pairs, where QUANT is -1 (hang), 0 (center), 1 (sit) or -2/ 2 (inter)
"
(let* ((thick (ly:grob-property beam 'thickness))
(layout (ly:grob-layout beam))
(lthick (ly:output-def-lookup layout 'line-thickness))
(staff-thick lthick) ; fixme.
(quant->coord (lambda (p q)
(if (= 2 (abs q))
(+ p (/ q 4.0))
(+ p (- (* 0.5 q thick) (* 0.5 q lthick))))))
(want-l (quant->coord (car posl) (cdr posl)))
(want-r (quant->coord (car posr) (cdr posr)))
(almost-equal (lambda (x y) (< (abs (- x y)) 1e-3))))
(if (or (not (almost-equal want-l (car posns)))
(not (almost-equal want-r (cdr posns))))
(begin
(ly:warning (_ "Error in beam quanting. Expected (~S,~S) found ~S.")
want-l want-r posns)
(set! (ly:grob-property beam 'quant-score)
(format "(~S,~S)" want-l want-r)))
(set! (ly:grob-property beam 'quant-score) ""))
posns
))
(define ((check-beam-slope-sign comparison) beam posns)
"Check whether the slope of BEAM is correct wrt. COMPARISON."
(let* ((slope-sign (- (cdr posns) (car posns)))
(correct (comparison slope-sign 0)))
(if (not correct)
(begin
(ly:warning (_ "Error in beam quanting. Expected ~S 0, found ~S.")
(procedure-name comparison) "0" slope-sign)
(set! (ly:grob-property beam 'quant-score)
(format "~S 0" (procedure-name comparison))))
(set! (ly:grob-property beam 'quant-score) ""))
posns))
(define-public (check-quant-callbacks l r)
(list ly:beam::calc-least-squares-positions
ly:beam::slope-damping
ly:beam::shift-region-to-valid
ly:beam::quanting
(check-beam-quant l r)
))
(define-public (check-slope-callbacks comparison)
(list ly:beam::calc-least-squares-positions
ly:beam::slope-damping
ly:beam::shift-region-to-valid
ly:beam::quanting
(check-beam-slope-sign comparison)
))
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