/** Given a midi note number, return the accidental (if any)
* that should be used when displaying the note in this key signature.
*
* The current measure is also required. Once we return an
* accidental for a measure, the accidental remains for the
* rest of the measure. So we must update the current keymap
* with any new accidentals that we return. When we move to another
* measure, we reset the keymap back to the key signature.
*/
public Accid GetAccidental(int notenumber, int measure)
{
if (measure != prevmeasure)
{
ResetKeyMap();
prevmeasure = measure;
}
Accid result = keymap[notenumber];
if (result == Accid.Sharp)
{
keymap[notenumber] = Accid.None;
keymap[notenumber - 1] = Accid.Natural;
}
else if (result == Accid.Flat)
{
keymap[notenumber] = Accid.None;
keymap[notenumber + 1] = Accid.Natural;
}
else if (result == Accid.Natural)
{
keymap[notenumber] = Accid.None;
int nextkey = NoteScale.FromNumber(notenumber + 1);
int prevkey = NoteScale.FromNumber(notenumber - 1);
/* If we insert a natural, then either:
* - the next key must go back to sharp,
* - the previous key must go back to flat.
*/
if (notenumber > 0)
{
if (keymap[notenumber - 1] == Accid.None && keymap[notenumber + 1] == Accid.None &&
NoteScale.IsBlackKey(nextkey) && NoteScale.IsBlackKey(prevkey))
{
if (num_flats == 0)
{
keymap[notenumber + 1] = Accid.Sharp;
}
else
{
keymap[notenumber - 1] = Accid.Flat;
}
}
else if (keymap[notenumber - 1] == Accid.None && NoteScale.IsBlackKey(prevkey))
{
keymap[notenumber - 1] = Accid.Flat;
}
else if (keymap[notenumber + 1] == Accid.None && NoteScale.IsBlackKey(nextkey))
{
keymap[notenumber + 1] = Accid.Sharp;
}
else
{
/* Shouldn't get here */
}
}
}
return(result);
}
/** The keymap tells what accidental symbol is needed for each
* note in the scale. Reset the keymap to the values of the
* key signature.
*/
private void ResetKeyMap()
{
Accid[] key;
if (num_flats > 0)
{
key = flatkeys[num_flats];
}
else
{
key = sharpkeys[num_sharps];
}
for (int notenumber = 0; notenumber < keymap.Length; notenumber++)
{
keymap[notenumber] = key[NoteScale.FromNumber(notenumber)];
}
}
/** Return the midi note number corresponding to this white note.
* The midi note numbers cover all keys, including sharps/flats,
* so each octave is 12 notes. Middle C (C4) is 60. Some example
* numbers for various notes:
*
* A 2 = 33
* A#2 = 34
* G 2 = 43
* G#2 = 44
* A 3 = 45
* A 4 = 57
* A#4 = 58
* B 4 = 59
* C 4 = 60
*/
public int Number()
{
int offset = 0;
switch (letter)
{
case A: offset = NoteScale.A; break;
case B: offset = NoteScale.B; break;
case C: offset = NoteScale.C; break;
case D: offset = NoteScale.D; break;
case E: offset = NoteScale.E; break;
case F: offset = NoteScale.F; break;
case G: offset = NoteScale.G; break;
default: offset = 0; break;
}
return(NoteScale.ToNumber(offset, octave));
}
/** Get the letter (A, A#, Bb) representing this note */
private string Letter(int notenumber, WhiteNote whitenote)
{
int notescale = NoteScale.FromNumber(notenumber);
switch (notescale)
{
case NoteScale.A: return("A");
case NoteScale.B: return("B");
case NoteScale.C: return("C");
case NoteScale.D: return("D");
case NoteScale.E: return("E");
case NoteScale.F: return("F");
case NoteScale.G: return("G");
case NoteScale.Asharp:
if (whitenote.Letter == WhiteNote.A)
{
return("A#");
}
else
{
return("Bb");
}
case NoteScale.Csharp:
if (whitenote.Letter == WhiteNote.C)
{
return("C#");
}
else
{
return("Db");
}
case NoteScale.Dsharp:
if (whitenote.Letter == WhiteNote.D)
{
return("D#");
}
else
{
return("Eb");
}
case NoteScale.Fsharp:
if (whitenote.Letter == WhiteNote.F)
{
return("F#");
}
else
{
return("Gb");
}
case NoteScale.Gsharp:
if (whitenote.Letter == WhiteNote.G)
{
return("G#");
}
else
{
return("Ab");
}
default:
return("");
}
}
/** Get the name for this note */
private string NoteName(int notenumber, WhiteNote whitenote)
{
if (sheetmusic.ShowNoteLetters == MidiOptions.NoteNameLetter)
{
return(Letter(notenumber, whitenote));
}
else if (sheetmusic.ShowNoteLetters == MidiOptions.NoteNameFixedDoReMi)
{
string[] fixedDoReMi =
{
"La", "Li", "Ti", "Do", "Di", "Re", "Ri", "Mi", "Fa", "Fi", "So", "Si"
};
int notescale = NoteScale.FromNumber(notenumber);
return(fixedDoReMi[notescale]);
}
else if (sheetmusic.ShowNoteLetters == MidiOptions.NoteNameMovableDoReMi)
{
string[] fixedDoReMi =
{
"La", "Li", "Ti", "Do", "Di", "Re", "Ri", "Mi", "Fa", "Fi", "So", "Si"
};
int mainscale = sheetmusic.MainKey.Notescale();
int diff = NoteScale.C - mainscale;
notenumber += diff;
if (notenumber < 0)
{
notenumber += 12;
}
int notescale = NoteScale.FromNumber(notenumber);
return(fixedDoReMi[notescale]);
}
else if (sheetmusic.ShowNoteLetters == MidiOptions.NoteNameFixedNumber)
{
string[] num =
{
"10", "11", "12", "1", "2", "3", "4", "5", "6", "7", "8", "9"
};
int notescale = NoteScale.FromNumber(notenumber);
return(num[notescale]);
}
else if (sheetmusic.ShowNoteLetters == MidiOptions.NoteNameMovableNumber)
{
string[] num =
{
"10", "11", "12", "1", "2", "3", "4", "5", "6", "7", "8", "9"
};
int mainscale = sheetmusic.MainKey.Notescale();
int diff = NoteScale.C - mainscale;
notenumber += diff;
if (notenumber < 0)
{
notenumber += 12;
}
int notescale = NoteScale.FromNumber(notenumber);
return(num[notescale]);
}
else
{
return("");
}
}
/** Given a midi note number, return the white note (the
* non-sharp/non-flat note) that should be used when displaying
* this note in this key signature. This should be called
* before calling GetAccidental().
*/
public WhiteNote GetWhiteNote(int notenumber)
{
int notescale = NoteScale.FromNumber(notenumber);
int octave = (notenumber + 3) / 12 - 1;
int letter = 0;
int[] whole_sharps =
{
WhiteNote.A, WhiteNote.A,
WhiteNote.B,
WhiteNote.C, WhiteNote.C,
WhiteNote.D, WhiteNote.D,
WhiteNote.E,
WhiteNote.F, WhiteNote.F,
WhiteNote.G, WhiteNote.G
};
int[] whole_flats =
{
WhiteNote.A,
WhiteNote.B,WhiteNote.B,
WhiteNote.C,
WhiteNote.D,WhiteNote.D,
WhiteNote.E,WhiteNote.E,
WhiteNote.F,
WhiteNote.G,WhiteNote.G,
WhiteNote.A
};
Accid accid = keymap[notenumber];
if (accid == Accid.Flat)
{
letter = whole_flats[notescale];
}
else if (accid == Accid.Sharp)
{
letter = whole_sharps[notescale];
}
else if (accid == Accid.Natural)
{
letter = whole_sharps[notescale];
}
else if (accid == Accid.None)
{
letter = whole_sharps[notescale];
/* If the note number is a sharp/flat, and there's no accidental,
* determine the white note by seeing whether the previous or next note
* is a natural.
*/
if (NoteScale.IsBlackKey(notescale))
{
if (keymap[notenumber - 1] == Accid.Natural &&
keymap[notenumber + 1] == Accid.Natural)
{
if (num_flats > 0)
{
letter = whole_flats[notescale];
}
else
{
letter = whole_sharps[notescale];
}
}
else if (keymap[notenumber - 1] == Accid.Natural)
{
letter = whole_sharps[notescale];
}
else if (keymap[notenumber + 1] == Accid.Natural)
{
letter = whole_flats[notescale];
}
}
}
/* The above algorithm doesn't quite work for G-flat major.
* Handle it here.
*/
if (num_flats == Gflat && notescale == NoteScale.B)
{
letter = WhiteNote.C;
}
if (num_flats == Gflat && notescale == NoteScale.Bflat)
{
letter = WhiteNote.B;
}
if (num_flats > 0 && notescale == NoteScale.Aflat)
{
octave++;
}
return(new WhiteNote(letter, octave));
}