(keepWithTag): add music functions

[lilypond.git] / scm / beam.scm

diff --git a/scm/beam.scm b/scm/beam.scm
index 11b3b21eb9415431fbcb3f496cb3c4ff1e5e1af2..0ac7f7f81f105265393acf90c22fc34466e2582b 100644 (file)
--- a/scm/beam.scm
+++ b/scm/beam.scm
@@ -3,7 +3,7 @@
 ;;;;
 ;;;; source file of the GNU LilyPond music typesetter
 ;;;; 
-;;;; (c)  2000--2003 Jan Nieuwenhuizen <janneke@gnu.org>
+;;;; (c)  2000--2004 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;;;
 
 ;;
@@ -59,3 +59,74 @@
       (dir-compare (/ (car total) (car count)) (/ (cdr total) (cdr count)))
       (dir-compare (car count) (cdr count))))
            
+
+(define ((check-beam-quant posl posr) beam)
+  "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*
+      ((posns (ly:grob-property beam 'positions))
+       (thick (ly:grob-property beam 'thickness))
+       (paper (ly:grob-paper beam))
+       (lthick (ly:output-def-lookup paper 'linethickness))
+       (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:warn
+           "Error in beam quanting found. Want (~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) "")
+
+       
+         )))
+(define ((check-beam-slope-sign comparison) beam)
+  "Check whether the slope of BEAM is correct wrt. COMPARISON."
+  (let*
+      ((posns (ly:grob-property beam 'positions))
+       (slope-sign (- (cdr posns) (car posns)))
+       (correct (comparison slope-sign 0)))
+
+    
+    (if (not correct)
+       (begin
+         (ly:warn "Error in beam quanting found. Want ~S 0 found ~S."
+                  (procedure-name comparison) slope-sign)
+         (set! (ly:grob-property beam 'quant-score)
+               (format "~S 0" (procedure-name comparison) )))
+       (set! (ly:grob-property beam 'quant-score) "")
+
+       
+       )))
+                
+(define-public (check-quant-callbacks l r)
+  (list Beam::least_squares
+    Beam::check_concave
+    Beam::slope_damping
+    Beam::shift_region_to_valid
+    Beam::quanting
+    (check-beam-quant l r)
+    ))
+
+                
+(define-public (check-slope-callbacks comparison)
+  (list Beam::least_squares
+    Beam::check_concave
+    Beam::slope_damping
+    Beam::shift_region_to_valid
+    Beam::quanting
+    (check-beam-slope-sign comparison)
+    ))
+
+