X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fpitch.cc;h=bc8a9e45a6cd9b8467ecc3af1344deed84da3998;hb=f26ba98bff8314bf0b379d3eea7fb3bee7e31dc3;hp=566b729e24fdacd7c1bca1df2ff8aecc6f071357;hpb=27e2316075225051985316e8132411961fe3e533;p=lilypond.git diff --git a/lily/pitch.cc b/lily/pitch.cc index 566b729e24..bc8a9e45a6 100644 --- a/lily/pitch.cc +++ b/lily/pitch.cc @@ -3,31 +3,32 @@ source file of the GNU LilyPond music typesetter - (c) 1998--2006 Han-Wen Nienhuys + (c) 1998--2007 Han-Wen Nienhuys */ #include "pitch.hh" #include "main.hh" +#include "scale.hh" #include "string-convert.hh" #include "warn.hh" #include "ly-smobs.icc" -Pitch::Pitch (int o, int n, int a) + +Pitch::Pitch (int o, int n, Rational a) { notename_ = n; alteration_ = a; octave_ = o; scale_ = default_global_scale; - normalise (); + normalize (); } /* FIXME: why is octave == 0 and default not middleC ? */ Pitch::Pitch () { notename_ = 0; - alteration_ = 0; scale_ = default_global_scale; octave_ = 0; } @@ -37,7 +38,7 @@ Pitch::compare (Pitch const &m1, Pitch const &m2) { int o = m1.octave_ - m2.octave_; int n = m1.notename_ - m2.notename_; - int a = m1.alteration_ - m2.alteration_; + Rational a = m1.alteration_ - m2.alteration_; if (o) return o; @@ -45,76 +46,73 @@ Pitch::compare (Pitch const &m1, Pitch const &m2) return n; if (a) return a; + return 0; } int Pitch::steps () const { - return notename_ + octave_ * scale_->step_semitones_.size (); + return notename_ + octave_ * scale_->step_tones_.size (); } -/* Should be settable from input? */ -// static Byte diatonic_scale_semitones[ ] = { 0, 2, 4, 5, 7, 9, 11 }; - - - -/* Calculate pitch height in 12th octave steps. Don't assume - normalised pitch as this function is used to normalise the pitch. */ -int -Pitch::semitone_pitch () const +Rational +Pitch::tone_pitch () const { int o = octave_; int n = notename_; while (n < 0) { - n += scale_->step_semitones_.size (); + n += scale_->step_tones_.size (); o--; } - if (alteration_ % 2) - programming_error ("semitone_pitch () called on quarter tone alteration."); + /* + we're effictively hardcoding the octave to 6 whole-tones, + which is as arbitrary as coding it to 1200 cents + */ + Rational tones ((o + n / scale_->step_tones_.size ()) * 6, 1); + tones += scale_->step_tones_[n % scale_->step_tones_.size ()]; - return ((o + n / scale_->step_semitones_.size ()) * 12 - + scale_->step_semitones_[n % scale_->step_semitones_.size ()] - + (alteration_ / 2)); + tones += alteration_; + + return tones; } +/* Calculate pitch height in 12th octave steps. Don't assume + normalized pitch as this function is used to normalize the pitch. */ int -Pitch::quartertone_pitch () const +Pitch::rounded_semitone_pitch () const { - int o = octave_; - int n = notename_; - while (n < 0) - { - n += scale_->step_semitones_.size (); - o--; - } + return int (double (tone_pitch () * Rational (2))); +} - return ((o + n / scale_->step_semitones_.size ()) * 24 - + 2 * scale_->step_semitones_[n % scale_->step_semitones_.size ()] - + alteration_); +int +Pitch::rounded_quartertone_pitch () const +{ + return int (double (tone_pitch () * Rational (4))); } void -Pitch::normalise () +Pitch::normalize () { - int pitch = quartertone_pitch (); - while (notename_ >= (int) scale_->step_semitones_.size ()) + Rational pitch = tone_pitch (); + while (notename_ >= (int) scale_->step_tones_.size ()) { - notename_ -= scale_->step_semitones_.size (); + notename_ -= scale_->step_tones_.size (); octave_++; - alteration_ -= quartertone_pitch () - pitch; + alteration_ -= tone_pitch () - pitch; } while (notename_ < 0) { - notename_ += scale_->step_semitones_.size (); + notename_ += scale_->step_tones_.size (); octave_--; - alteration_ -= quartertone_pitch () - pitch; + alteration_ -= tone_pitch () - pitch; } - while (alteration_ > DOUBLE_SHARP) + + while (alteration_ > Rational (1)) { - if (notename_ == 6) + if (notename_ == int (scale_->step_tones_.size ())) { notename_ = 0; octave_++; @@ -122,47 +120,46 @@ Pitch::normalise () else notename_++; - alteration_ = 0; - alteration_ -= quartertone_pitch () - pitch; + alteration_ = Rational (0); + alteration_ -= tone_pitch () - pitch; } - - while (alteration_ < DOUBLE_FLAT) + while (alteration_ < Rational (-1)) { if (notename_ == 0) { - notename_ = 6; + notename_ = scale_->step_tones_.size (); octave_--; } else notename_--; alteration_ = 0; - alteration_ -= quartertone_pitch () - pitch; + alteration_ -= tone_pitch () - pitch; } } -/* WHugh, wat een intervaas */ void Pitch::transpose (Pitch delta) { - int new_semi = quartertone_pitch () +delta.quartertone_pitch (); + Rational new_alter = tone_pitch () + delta.tone_pitch (); + octave_ += delta.octave_; notename_ += delta.notename_; - alteration_ += new_semi - quartertone_pitch (); + alteration_ += new_alter - tone_pitch (); - normalise (); + normalize (); } Pitch pitch_interval (Pitch const &from, Pitch const &to) { - int sound = to.quartertone_pitch () - from.quartertone_pitch (); + Rational sound = to.tone_pitch () - from.tone_pitch (); Pitch pt (to.get_octave () - from.get_octave (), to.get_notename () - from.get_notename (), to.get_alteration () - from.get_alteration ()); - return pt.transposed (Pitch (0, 0, sound - pt.quartertone_pitch ())); + return pt.transposed (Pitch (0, 0, sound - pt.tone_pitch ())); } /* FIXME @@ -173,11 +170,12 @@ char const *accname[] = {"eses", "eseh", "es", "eh", "", string Pitch::to_string () const { - int n = (notename_ + 2) % scale_->step_semitones_.size (); + int n = (notename_ + 2) % scale_->step_tones_.size (); string s = ::to_string (char (n + 'a')); - if (alteration_) - s += string (accname[alteration_ - DOUBLE_FLAT]); - + Rational qtones = alteration_ * Rational (4,1); + int qt = int (rint (Real (qtones))); + + s += string (accname[qt + 4]); if (octave_ >= 0) { int o = octave_ + 1; @@ -251,7 +249,7 @@ Pitch::print_smob (SCM s, SCM port, scm_print_state *) { Pitch *r = (Pitch *) SCM_CELL_WORD_1 (s); scm_puts ("#to_string ().c_str ()), port); + scm_display (ly_string2scm (r->to_string ()), port); scm_puts (" >", port); return 1; } @@ -294,7 +292,7 @@ Pitch::get_notename () const return notename_; } -int +Rational Pitch::get_alteration () const { return alteration_; @@ -307,3 +305,14 @@ Pitch::transposed (Pitch d) const p.transpose (d); 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 ()); +}