X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fpitch.cc;h=90d50d46e2ff43bafeeb90136f8f81ec55ce1251;hb=5b4b0d6e9a197e8f9eb085b7c2ad78b8be3e5cfc;hp=4d983ab6d5e4e6a729e0440c51d9e6e302426285;hpb=7a3c3526e082ada6fefbe564315046a14ecf609c;p=lilypond.git

diff --git a/lily/pitch.cc b/lily/pitch.cc
index 4d983ab6d5..90d50d46e2 100644
--- a/lily/pitch.cc
+++ b/lily/pitch.cc
@@ -3,7 +3,7 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c) 1998--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  (c) 1998--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
 */
 
 #include "pitch.hh"
@@ -22,7 +22,7 @@ Pitch::Pitch (int o, int n, Rational a)
   alteration_ = a;
   octave_ = o;
   scale_ = default_global_scale; 
-  normalize ();
+  normalize_octave ();
 }
 
 /* FIXME: why is octave == 0 and default not middleC ? */
@@ -53,26 +53,13 @@ Pitch::compare (Pitch const &m1, Pitch const &m2)
 int
 Pitch::steps () const
 {
-  return notename_ + octave_ * scale_->step_tones_.size ();
+  return notename_ + octave_ * scale_->step_count ();
 }
 
 Rational
 Pitch::tone_pitch () const
 {
-  int o = octave_;
-  int n = notename_;
-  while (n < 0)
-    {
-      n += scale_->step_tones_.size ();
-      o--;
-    }
-
-  Rational tones ((o + n / scale_->step_tones_.size ()) * 6, 1);
-  tones += scale_->step_tones_[n % scale_->step_tones_.size ()];
-
-  tones += alteration_;
-  
-  return tones;
+  return scale_->tones_at_step (notename_, octave_) + alteration_;
 }
 
 /* Calculate pitch height in 12th octave steps.  Don't assume
@@ -90,50 +77,38 @@ Pitch::rounded_quartertone_pitch () const
 }
 
 void
-Pitch::normalize ()
+Pitch::normalize_octave ()
 {
-  Rational pitch = tone_pitch ();
-  while (notename_ >= (int) scale_->step_tones_.size ())
-    {
-      notename_ -= scale_->step_tones_.size ();
-      octave_++;
-      alteration_ -= tone_pitch () - pitch;
-    }
-  while (notename_ < 0)
-    {
-      notename_ += scale_->step_tones_.size ();
-      octave_--;
-      alteration_ -= tone_pitch () - pitch;
-    }
+  int normalized_step = notename_ % scale_->step_count ();
+  if (normalized_step < 0)
+    normalized_step += scale_->step_count ();
+
+  octave_ += (notename_ - normalized_step) / scale_->step_count ();
+  notename_ = normalized_step;
+}
 
+void
+Pitch::normalize_alteration ()
+{
   while (alteration_ > Rational (1))
     {
-      if (notename_ == int (scale_->step_tones_.size ()))
-	{
-	  notename_ = 0;
-	  octave_++;
-	}
-      else
-	notename_++;
-
-      alteration_ = Rational (0);
-      alteration_ -= tone_pitch () - pitch;
+      alteration_ -= scale_->step_size (notename_);
+      notename_++;
     }
-  while (alteration_ < Rational(-1))
+  while (alteration_ < Rational (-1))
     {
-      if (notename_ == 0)
-	{
-	  notename_ = scale_->step_tones_.size ();
-	  octave_--;
-	}
-      else
-	notename_--;
-
-      alteration_ = 0;
-      alteration_ -= tone_pitch () - pitch;
+      notename_--;
+      alteration_ += scale_->step_size (notename_);
     }
 }
 
+void
+Pitch::normalize ()
+{
+  normalize_alteration ();
+  normalize_octave ();
+}
+
 void
 Pitch::transpose (Pitch delta)
 {
@@ -143,7 +118,7 @@ Pitch::transpose (Pitch delta)
   notename_ += delta.notename_;
   alteration_ += new_alter - tone_pitch ();
 
-  normalize ();
+  normalize_octave ();
 }
 
 Pitch
@@ -166,12 +141,12 @@ char const *accname[] = {"eses", "eseh", "es", "eh", "",
 string
 Pitch::to_string () const
 {
-  int n = (notename_ + 2) % scale_->step_tones_.size ();
+  int n = (notename_ + 2) % scale_->step_count ();
   string s = ::to_string (char (n + 'a'));
-      Rational qtones = alteration_ * Rational (4,1);
-      int qt = int (rint (Real (qtones)));
+  Rational qtones = alteration_ * Rational (4,1);
+  int qt = int (rint (Real (qtones)));
       
-      s += string (accname[qt + 4]);
+  s += string (accname[qt + 4]);
   if (octave_ >= 0)
     {
       int o = octave_ + 1;
@@ -245,7 +220,7 @@ Pitch::print_smob (SCM s, SCM port, scm_print_state *)
 {
   Pitch *r = (Pitch *) SCM_CELL_WORD_1 (s);
   scm_puts ("#<Pitch ", port);
-  scm_display (scm_makfrom0str (r->to_string ().c_str ()), port);
+  scm_display (ly_string2scm (r->to_string ()), port);
   scm_puts (" >", port);
   return 1;
 }
@@ -302,5 +277,13 @@ Pitch::transposed (Pitch d) const
   return p;
 }
 
+Rational NATURAL_ALTERATION (0);
 Rational FLAT_ALTERATION (-1, 2);
+Rational DOUBLE_FLAT_ALTERATION (-1);
 Rational SHARP_ALTERATION (1, 2);
+
+Pitch
+Pitch::negated () const
+{
+  return pitch_interval (*this, Pitch ());
+}