public override int GetHashCode()
{
unchecked
{
var result = 17;
result = result * 23 + IntervalNumber.GetHashCode();
result = result * 23 + Alteration.GetHashCode();
return(result);
}
}
public Key GetByIntervalNumber(Key startKey, IntervalNumber intervalNumber)
{
var outKey = startKey;
for (int i = 0; i < (int)intervalNumber; i++)
{
outKey = GetNextKey(outKey);
}
return(outKey);
}
private static int GetSemitones(IntervalNumber number, IntervalQuality quality, sbyte multiplicity)
{
int semitones = s_numberToSemitones[number - IntervalNumber.Unison];
if (quality == IntervalQuality.Minor || quality == IntervalQuality.Diminished && !number.IsPerfect())
{
semitones--;
}
if (multiplicity > 0)
{
if (quality == IntervalQuality.Augmented)
{
semitones += multiplicity;
}
else
{
semitones -= multiplicity;
}
}
return(semitones);
}
public static Interval operator +(Interval interval1, Interval interval2)
{
int absoluteNumber = interval1._absoluteNumber + interval2._absoluteNumber;
int semitones = (interval1.Semitones + interval2.Semitones) % SemitonesPerOctave;
IntervalNumber number = (IntervalNumber)Math.Abs(absoluteNumber % NumbersPerOctave);
IntervalQuality quality;
if (number.IsPerfect())
{
quality = IntervalQuality.Perfect;
semitones -= GetSemitones(number, quality, 0);
}
else
{
quality = IntervalQuality.Major;
semitones -= GetSemitones(number, quality, 0);
if (semitones < 0)
{
quality = IntervalQuality.Minor;
semitones++;
}
}
if (semitones > 0)
{
quality = IntervalQuality.Augmented;
}
else if (semitones < 0)
{
quality = IntervalQuality.Diminished;
}
return(new Interval(absoluteNumber, quality, (sbyte)Math.Abs(semitones)));
}
public KeyViewModel Get(Key startKey, IntervalNumber intervalNumber)
{
return(_keyService.GetByIntervalNumber(startKey, intervalNumber));
}
public void Test_GetByIntervalNumber(Key inputKey, IntervalNumber interval, Key expectedKey)
{
var key = _keyService.GetByIntervalNumber(inputKey, interval);
Assert.That(key, Is.EqualTo(expectedKey));
}
public static bool IsPerfect(this IntervalNumber number)
{
return(number == IntervalNumber.Unison || number == IntervalNumber.Fourth || number == IntervalNumber.Fifth || number == IntervalNumber.Octave);
}
public Interval(IntervalNumber number, IntervalQuality quality, sbyte multiplicity = 0)
: this(IntervalNumber.Unison <= number && number <= IntervalNumber.Octave ? number - IntervalNumber.Unison : throw new ArgumentOutOfRangeException(nameof(number)),
quality, multiplicity)
{
}
