public static int GetSemitonesBetween(NaturalNote naturalNote1, NaturalNote naturalNote2)
{
var number1 = s_naturalNoteToNumber[naturalNote1 - NaturalNote.C];
var number2 = s_naturalNoteToNumber[naturalNote2 - NaturalNote.C];
if (number1 > number2)
{
number1 -= Interval.SemitonesPerOctave;
}
return(number2 - number1);
}
public Note(NaturalNote naturalNote, Accidental accidental = Accidental.Natural)
{
if (naturalNote < NaturalNote.C || naturalNote > NaturalNote.B)
{
throw new ArgumentOutOfRangeException(nameof(naturalNote));
}
if (accidental < Accidental.DoubleFlat || accidental > Accidental.DoubleSharp)
{
throw new ArgumentOutOfRangeException(nameof(naturalNote));
}
_naturalNote = naturalNote;
_accidental = accidental;
}
public override string ToString()
{
return(NaturalNote.ToString() + Accidental.GetSign());
}
public Note Invert()
{
if (Accidental == Accidental.Natural)
{
return(this);
}
NaturalNote newNaturalNote;
Accidental invertedAccidental;
NaturalNote naturalNote = _naturalNote;
if (Accidental > Accidental.Natural)
{
int semitonesDifference = Accidental - Accidental.Natural;
for (; ;)
{
newNaturalNote = naturalNote + 1;
if (newNaturalNote - NaturalNote.C >= NumberOfNaturalNotes)
{
newNaturalNote -= NumberOfNaturalNotes;
}
semitonesDifference -= GetSemitonesBetween(naturalNote, newNaturalNote);
if (semitonesDifference < Accidental.DoubleFlat - Accidental.Natural)
{
throw new InvalidOperationException();
}
else if (semitonesDifference < Accidental.Natural - Accidental.Natural)
{
invertedAccidental = (Accidental)semitonesDifference;
break;
}
naturalNote = newNaturalNote;
}
}
else
{
int semitonesDifference = Accidental - Accidental.Natural;
for (; ;)
{
newNaturalNote = naturalNote - 1;
if (newNaturalNote - NaturalNote.C < 0)
{
newNaturalNote += NumberOfNaturalNotes;
}
semitonesDifference += Interval.SemitonesPerOctave - GetSemitonesBetween(naturalNote, newNaturalNote);
if (semitonesDifference > Accidental.DoubleSharp - Accidental.Natural)
{
throw new InvalidOperationException();
}
else if (semitonesDifference > Accidental.Natural - Accidental.Natural)
{
invertedAccidental = (Accidental)semitonesDifference;
break;
}
naturalNote = newNaturalNote;
}
}
return(new Note(newNaturalNote, invertedAccidental));
}
