2 musical-pitch.cc -- implement Musical_pitch
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "musical-pitch.hh"
13 Musical_pitch::Musical_pitch (int n, int a, int o)
21 Musical_pitch::print () const
29 Musical_pitch::compare (Musical_pitch const &m1, Musical_pitch const &m2)
31 int o= m1.octave_i_ - m2.octave_i_;
32 int n = m1.notename_i_ - m2.notename_i_;
33 int a = m1.accidental_i_ - m2.accidental_i_;
45 Musical_pitch::steps () const
47 return notename_i_ + octave_i_*7;
51 should be settable from input to allow "viola"-mode
53 static Byte pitch_byte_a[ ] = { 0, 2, 4, 5, 7, 9, 11 };
56 Musical_pitch::semitone_pitch () const
58 return pitch_byte_a[ notename_i_ % 7 ] + accidental_i_ + octave_i_ * 12;
62 Musical_pitch::transpose (Musical_pitch delta)
64 int old_pitch = semitone_pitch ();
65 int delta_pitch = delta.semitone_pitch ();
66 octave_i_ += delta.octave_i_;
67 notename_i_ += delta.notename_i_;
70 while (notename_i_ >= 7)
76 int new_pitch = semitone_pitch ();
77 int delta_acc = new_pitch - old_pitch - delta_pitch;
78 accidental_i_ -= delta_acc;
83 // nice test for internationalisation strings
84 char const *accname[] = {"double flat", "flat", "natural",
85 "sharp" , "double sharp"};
87 char const *accname[] = {"eses", "es", "", "is" , "isis"};
91 Musical_pitch::str () const
93 int n = (notename_i_ + 2) % 7;
94 String s = to_str (char(n + 'a'));
96 s += String (accname[accidental_i_ + 2]);
100 int o = octave_i_ + 1;
104 else if (octave_i_ <0)
106 int o = (-octave_i_) - 1;
112 s += String ((octave_i_> 0)? "^": "_") + to_str (octave_i_);
119 change me to relative, counting from last pitch p
120 return copy of resulting pitch
123 Musical_pitch::to_relative_octave (Musical_pitch p)
125 int oct_mod = octave_i_ + 1; // account for c' = octave 1 iso. 0 4
126 Musical_pitch up_pitch (p);
127 Musical_pitch down_pitch (p);
129 up_pitch.accidental_i_ = accidental_i_;
130 down_pitch.accidental_i_ = accidental_i_;
132 Musical_pitch n = *this;
133 up_pitch.up_to (notename_i_);
134 down_pitch.down_to (notename_i_);
137 if (abs (up_pitch.steps () - h) < abs (down_pitch.steps () - h))
142 n.octave_i_ += oct_mod;
149 Musical_pitch::up_to (int notename)
151 if (notename_i_ > notename)
155 notename_i_ = notename;
159 Musical_pitch::down_to (int notename)
161 if (notename_i_ < notename)
165 notename_i_ = notename;