def __init__(self,
anchor_pitch=DiatonicPitch.parse('A:0'),
anchor_value=9,
pitch_unit=1):
"""
Constructor,
"""
self.__anchor_pitch = anchor_pitch
if not isinstance(self.anchor_pitch, DiatonicPitch):
raise Exception('Anchor is not a DiatonicPitch')
self.__anchor_value = anchor_value
self.__pitch_unit = pitch_unit
anchor_index = self.anchor_pitch.chromatic_distance
base_value = anchor_value - anchor_index * pitch_unit
self.value_to_pitch = OrderedMap()
self.pitch_to_value = dict()
for i in range(ChromaticScale.chromatic_start_index(),
ChromaticScale.chromatic_end_index() + 1):
pitch = DiatonicFoundation.map_to_diatonic_scale(i)[0]
value = base_value + i * pitch_unit
self.value_to_pitch.insert(value, pitch)
self.pitch_to_value[pitch] = value
PitchRangeInterpreter.__init__(self)
def test_map_to_diatonic_scale(self):
answers = DiatonicFoundation.map_to_diatonic_scale(46)
assert DiatonicPitch.parse('Cbb:4') in answers
assert DiatonicPitch.parse('A#:3') in answers
assert DiatonicPitch.parse('Bb:3') in answers
answers = DiatonicFoundation.map_to_diatonic_scale(47)
assert DiatonicPitch.parse('Cb:4') in answers
assert DiatonicPitch.parse('A##:3') in answers
assert DiatonicPitch.parse('B:3') in answers
answers = DiatonicFoundation.map_to_diatonic_scale(48)
assert DiatonicPitch.parse('C:4') in answers
assert DiatonicPitch.parse('B#:3') in answers
assert DiatonicPitch.parse('Dbb:4') in answers
answers = DiatonicFoundation.map_to_diatonic_scale(49)
assert DiatonicPitch.parse('C#:4') in answers
assert DiatonicPitch.parse('B##:3') in answers
assert DiatonicPitch.parse('Db:4') in answers
def eval_as_accurate_chromatic_distance(self, v):
floor_value = self.value_to_pitch.floor(v)
if floor_value is None:
raise ChromaticRangeInterpreterException(
'Illegal chromatic pitch range paramger value {0}.'.format(v))
low_pitch = self.value_to_pitch[floor_value]
index = low_pitch.chromatic_distance
if index >= ChromaticScale.chromatic_end_index() or math.isclose(
v, floor_value):
return low_pitch.chromatic_distance
high_pitch = DiatonicFoundation.map_to_diatonic_scale(index + 1)[0]
return low_pitch.chromatic_distance + \
((v - floor_value) / self.pitch_unit) * \
(high_pitch.chromatic_distance - low_pitch.chromatic_distance)
def __str__(self):
return 'P-R({0}, {1})'.format(
DiatonicFoundation.map_to_diatonic_scale(self.start_index)[0],
DiatonicFoundation.map_to_diatonic_scale(self.end_index)[0])
def enharmonics(self):
return DiatonicFoundation.map_to_diatonic_scale(
self.chromatic_distance)
