def __init__(self):
super().__init__()
# TODO: Figure out this one more in depth
self.set_scale_degree('I', function='subdominant')
self.triad_quality = "diminished_triad"
self.add_interval(interval.IntervalSpelling("m", 3))
self.add_interval(interval.IntervalSpelling("D", 5))
self.add_interval(interval.IntervalSpelling("D", 7))
def __init__(self, augmented_sixth_type):
super().__init__()
self.set_scale_degree('iv', '#')
self.add_interval(interval.IntervalSpelling("D", 3))
self.add_interval(interval.IntervalSpelling("D", 5))
self.augmented_sixth_type = augmented_sixth_type
if self.augmented_sixth_type == 'german':
self.add_interval(interval.IntervalSpelling("D", 7))
elif self.augmented_sixth_type == 'french':
self.add_interval(interval.IntervalSpelling("m", 6))
def __init__(self, scale_degree='vii'):
super().__init__()
valid_degrees = ['vii', 'ii']
if scale_degree not in valid_degrees:
raise ValueError(
'invalid scale degree {} for half diminished seventh chord'.
format(scale_degree))
self.set_scale_degree(scale_degree)
# TODO: Figure out the alteration (vii or #vii; will be complicated)
self.triad_quality = "diminished_triad"
self.add_interval(interval.IntervalSpelling("m", 3))
self.add_interval(interval.IntervalSpelling("D", 5))
self.add_interval(interval.IntervalSpelling("m", 7))
def set_triad_quality(self, triad_quality):
if triad_quality not in TertianChord.triad_qualities:
raise KeyError("the triad quality '{}' is not supported".format(
triad_quality))
self.triad_quality = triad_quality
if triad_quality == 'major_triad':
self.add_interval(interval.IntervalSpelling('M', 3))
self.add_interval(interval.IntervalSpelling('P', 5))
elif triad_quality == 'minor_triad':
self.add_interval(interval.IntervalSpelling('m', 3))
self.add_interval(interval.IntervalSpelling('P', 5))
elif triad_quality == 'diminished_triad':
self.add_interval(interval.IntervalSpelling('m', 3))
self.add_interval(interval.IntervalSpelling('D', 5))
elif triad_quality == 'augmented_triad':
self.add_interval(interval.IntervalSpelling('M', 3))
self.add_interval(interval.IntervalSpelling('A', 5))
class Key(object):
_scale_mapping = {
"major": scale.MajorScale(),
"natural_minor": scale.NaturalMinorScale(),
"harmonic_minor": scale.HarmonicMinorScale(),
"default_minor": scale.HarmonicMinorScale(),
"ascending_melodic_minor": scale.AscendingMelodicMinorScale()
}
_scale_degree_alterations = {
'--': interval.IntervalSpelling('DD', 1),
'bb': interval.IntervalSpelling('DD', 1),
'-': interval.IntervalSpelling('D', 1),
'b': interval.IntervalSpelling('D', 1),
"#": interval.IntervalSpelling('A', 1),
"##": interval.IntervalSpelling('AA', 1),
"x": interval.IntervalSpelling('AA', 1)
}
def __init__(self, note_letter, alteration=None, scale="major"):
self.tonic = pitch_class.PitchClassSpelling(note_letter, alteration)
self.scale = scale
if not scale in self._scale_mapping:
raise KeyError("scale '{}' is not supported.".format(scale))
self.mode = Key._scale_mapping[scale]
def scale_degree(self, scale_degree, alteration=None):
if type(scale_degree) == str:
if scale_degree not in common.roman_to_int:
raise ValueError(
"scale degree {} is not supported.".format(scale_degree))
scale_degree = common.roman_to_int[scale_degree]
if 1 > scale_degree or scale_degree > common.DIATONIC_CLASSES:
raise ValueError("scale degree should be within 1 and 7.")
interval = self.mode.step_to_interval_spelling(scale_degree)
pc = self.tonic.to_interval(interval)
if alteration:
if not alteration in self._scale_degree_alterations:
raise KeyError(
"alteration '{}' is not supported.".format(alteration))
unison_alteration = self._scale_degree_alterations[alteration]
pc = pc.to_interval(unison_alteration)
return pc
def __str__(self):
return str(self.tonic) + " " + self.scale
def step_to_interval_spelling(self, step, mode=1):
qualities = self._qualities[(mode - 1) % harmalysis.common.DIATONIC_CLASSES]
quality = qualities[(step - 1) % harmalysis.common.DIATONIC_CLASSES]
return interval.IntervalSpelling(quality, step)
def set_as_minor(self):
self.set_scale_degree('i', function='dominant')
self.triad_quality = "minor_triad"
self.add_interval(interval.IntervalSpelling("m", 3))
self.add_interval(interval.IntervalSpelling("P", 5))
def __init__(self):
super().__init__()
self.set_scale_degree('II', 'b')
self.triad_quality = "major_triad"
self.add_interval(interval.IntervalSpelling('M', 3))
self.add_interval(interval.IntervalSpelling('P', 5))