2 musical-pitch.cc -- implement Musical_pitch
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "musical-pitch.hh"
14 Musical_pitch::to_scm ()const
16 return gh_list (gh_int2scm (octave_i_),
17 gh_int2scm (notename_i_),
18 gh_int2scm (accidental_i_),
23 Musical_pitch::Musical_pitch (SCM s)
25 octave_i_ = gh_scm2int (gh_car (s));
26 notename_i_ = gh_scm2int (gh_cadr (s));
27 accidental_i_ = gh_scm2int (gh_caddr (s));
30 Musical_pitch::Musical_pitch (int n, int a, int o)
38 Musical_pitch::print () const
46 Musical_pitch::compare (Musical_pitch const &m1, Musical_pitch const &m2)
48 int o= m1.octave_i_ - m2.octave_i_;
49 int n = m1.notename_i_ - m2.notename_i_;
50 int a = m1.accidental_i_ - m2.accidental_i_;
62 Musical_pitch::steps () const
64 return notename_i_ + octave_i_*7;
68 should be settable from input to allow "viola"-mode
70 static Byte pitch_byte_a[ ] = { 0, 2, 4, 5, 7, 9, 11 };
73 Musical_pitch::semitone_pitch () const
75 return pitch_byte_a[ notename_i_ % 7 ] + accidental_i_ + octave_i_ * 12;
79 Musical_pitch::transpose (Musical_pitch delta)
81 int old_pitch = semitone_pitch ();
82 int delta_pitch = delta.semitone_pitch ();
83 octave_i_ += delta.octave_i_;
84 notename_i_ += delta.notename_i_;
87 while (notename_i_ >= 7)
93 int new_pitch = semitone_pitch ();
94 int delta_acc = new_pitch - old_pitch - delta_pitch;
95 accidental_i_ -= delta_acc;
100 // nice test for internationalisation strings
101 char const *accname[] = {"double flat", "flat", "natural",
102 "sharp" , "double sharp"};
104 char const *accname[] = {"eses", "es", "", "is" , "isis"};
108 Musical_pitch::str () const
110 int n = (notename_i_ + 2) % 7;
111 String s = to_str (char(n + 'a'));
113 s += String (accname[accidental_i_ + 2]);
117 int o = octave_i_ + 1;
121 else if (octave_i_ <0)
123 int o = (-octave_i_) - 1;
133 change me to relative, counting from last pitch p
134 return copy of resulting pitch
137 Musical_pitch::to_relative_octave (Musical_pitch p)
139 int oct_mod = octave_i_ + 1; // account for c' = octave 1 iso. 0 4
140 Musical_pitch up_pitch (p);
141 Musical_pitch down_pitch (p);
143 up_pitch.accidental_i_ = accidental_i_;
144 down_pitch.accidental_i_ = accidental_i_;
146 Musical_pitch n = *this;
147 up_pitch.up_to (notename_i_);
148 down_pitch.down_to (notename_i_);
151 if (abs (up_pitch.steps () - h) < abs (down_pitch.steps () - h))
156 n.octave_i_ += oct_mod;
163 Musical_pitch::up_to (int notename)
165 if (notename_i_ > notename)
169 notename_i_ = notename;
173 Musical_pitch::down_to (int notename)
175 if (notename_i_ < notename)
179 notename_i_ = notename;