Example #1
0
func New(val, offset int) Interval {
	octaves := int((val - 1) / 7.0)
	diatonic := int(mt_math.Mod(float64(val-1), 7))
	chromatic := DiatonicToChromatic(diatonic) + offset

	return Interval{octaves, diatonic, chromatic}
}
Example #2
0
func qualityInterval(quality Quality) func(int) Interval {
	return func(val int) Interval {
		diatonic := int(mt_math.Mod(float64(val-1), 7))
		diff := qualityDiff(perfect(diatonic), quality)
		return New(val, diff)
	}
}
Example #3
0
func (i Interval) AddInterval(o Interval) Interval {
	diatonics := i.Diatonic() + o.Diatonic()
	diatonicOctaves := diatonics / 7.0
	diatonicRemainder := int(mt_math.Mod(float64(diatonics), 7.0))

	octaves := i.Octaves() + o.Octaves() + diatonicOctaves
	chromatic := i.Chromatic() + o.Chromatic()
	if diatonicOctaves > 0 {
		chromatic = int(mt_math.Mod(float64(chromatic), 12.0))
	}

	return Interval{
		octaves:   octaves,
		diatonic:  diatonicRemainder,
		chromatic: chromatic,
	}
}
Example #4
0
func (p Pitch) Name(s NameStrategy) string {
	semitones := int(mt_math.Mod(float64(p.interval.Semitones()), 12.0))
	nameIndex := s.GetMappedIndex(semitones)
	delta := semitones - interval.DiatonicToChromatic(nameIndex)

	if delta == 0 {
		return PitchNames[nameIndex]
	}
	return fmt.Sprintf("%s%s", PitchNames[nameIndex], accidentalName(delta+2))
}
Example #5
0
func accidentalName(i int) string {
	return AccidentalNames[int(mt_math.Mod(float64(i), float64(len(AccidentalNames))))]
}
Example #6
0
	C int = iota
	D
	E
	F
	G
	A
	B
)

var (
	AccidentalNames = [5]string{"bb", "b", "", "#", "x"}
	PitchNames      = [7]string{"C", "D", "E", "F", "G", "A", "B"}
	namesForFlats   = [12]int{0, 1, 1, 2, 2, 3, 4, 4, 5, 5, 6, 6}
	namesForSharps  = [12]int{0, 0, 1, 1, 2, 3, 3, 4, 4, 5, 5, 6}

	FlatNames  = NameStrategyFunc(func(i int) int { return namesForFlats[int(mt_math.Mod(float64(i), 12))] })
	SharpNames = NameStrategyFunc(func(i int) int { return namesForSharps[int(mt_math.Mod(float64(i), 12))] })
)

type NameStrategy interface {
	GetMappedIndex(int) int
}

type NameStrategyFunc func(int) int

func (f NameStrategyFunc) GetMappedIndex(i int) int {
	return f(i)
}

func New(semitone int, accidental int) Pitch {
	return Pitch{interval.New(semitone+1, accidental)}