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, bool c)
22 Musical_pitch::print () const
30 Musical_pitch::compare (Musical_pitch const &m1, Musical_pitch const &m2)
32 int o= m1.octave_i_ - m2.octave_i_;
33 int n = m1.notename_i_ - m2.notename_i_;
34 int a = m1.accidental_i_ - m2.accidental_i_;
46 Musical_pitch::steps () const
48 return notename_i_ + octave_i_*7;
52 should be settable from input to allow "viola"-mode
54 static Byte pitch_byte_a[ ] = { 0, 2, 4, 5, 7, 9, 11 };
57 Musical_pitch::semitone_pitch () const
59 return pitch_byte_a[ notename_i_ % 7 ] + accidental_i_ + octave_i_ * 12;
63 Musical_pitch::transpose (Musical_pitch delta)
65 int old_pitch = semitone_pitch ();
66 int delta_pitch = delta.semitone_pitch ();
67 octave_i_ += delta.octave_i_;
68 notename_i_ += delta.notename_i_;
71 while (notename_i_ >= 7)
77 int new_pitch = semitone_pitch ();
78 int delta_acc = new_pitch - old_pitch - delta_pitch;
79 accidental_i_ -= delta_acc;
84 // nice test for internationalisation strings
85 char const *accname[] = {"double flat", "flat", "natural",
86 "sharp" , "double sharp"};
88 char const *accname[] = {"eses", "es", "", "is" , "isis"};
92 Musical_pitch::str () const
94 int n = (notename_i_ + 2) % 7;
95 String s = to_str (char(n + 'a'));
97 s += String (accname[accidental_i_ + 2]);
101 int o = octave_i_ + 1;
105 else if (octave_i_ <0)
107 int o = (-octave_i_) - 1;
113 s += String ((octave_i_> 0)? "^": "_") + to_str (octave_i_);
120 change me to relative, counting from last pitch p
121 return copy of resulting pitch
124 Musical_pitch::to_relative_octave (Musical_pitch p)
126 int oct_mod = octave_i_ + 1; // account for c' = octave 1 iso. 0 4
127 Musical_pitch up_pitch (p);
128 Musical_pitch down_pitch (p);
130 up_pitch.accidental_i_ = accidental_i_;
131 down_pitch.accidental_i_ = accidental_i_;
133 Musical_pitch n = *this;
134 up_pitch.up_to (notename_i_);
135 down_pitch.down_to (notename_i_);
138 if (abs (up_pitch.steps () - h) < abs (down_pitch.steps () - h))
143 n.octave_i_ += oct_mod;
150 Musical_pitch::up_to (int notename)
152 if (notename_i_ > notename)
156 notename_i_ = notename;
160 Musical_pitch::down_to (int notename)
162 if (notename_i_ < notename)
166 notename_i_ = notename;