def test_basic_plf(self):
array = [(0, 'A:0'), (Fraction(1, 2), 'C:5'), (Position(3, 4), 'G:4'),
(1, 'A:5')]
f = PiecewiseLinearPitchFunction(array)
assert DiatonicPitch.parse('A:0').chromatic_distance == f.eval(0)
assert DiatonicPitch.parse('C:5').chromatic_distance == f.eval(0.5)
assert DiatonicPitch.parse('G:4').chromatic_distance == f.eval(
Fraction(3, 4))
assert DiatonicPitch.parse('A:5').chromatic_distance == f.eval(
Position(1))
assert DiatonicPitch.parse(
'A:0').chromatic_distance == f.eval_as_chromatic_distance(0)
assert DiatonicPitch.parse(
'C:5').chromatic_distance == f.eval_as_chromatic_distance(0.5)
assert DiatonicPitch.parse(
'G:4').chromatic_distance == f.eval_as_chromatic_distance(
Fraction(3, 4))
assert DiatonicPitch.parse(
'A:5').chromatic_distance == f.eval_as_chromatic_distance(
Position(1))
print(f.eval_as_frequency(0))
assert ChromaticScale.A0 == f.eval_as_frequency(0)
print(
ChromaticScale.index_to_location(
DiatonicPitch.parse('C:5').chromatic_distance))
print(
ChromaticScale.get_frequency(
ChromaticScale.index_to_location(
DiatonicPitch.parse('C:5').chromatic_distance)))
print(f.eval_as_frequency(0.5))
assert math.isclose(
ChromaticScale.get_frequency(
ChromaticScale.index_to_location(
DiatonicPitch.parse('C:5').chromatic_distance)),
f.eval_as_frequency(0.5))
print(f.eval(0.25)) # 34.5
print(f.eval_as_nearest_pitch(0.25))
assert math.isclose(
ChromaticScale.A0 * math.pow(ChromaticScale.SEMITONE_RATIO,
f.eval(0.25) - 9),
f.eval_as_frequency(0.25))
assert 'A#:2' == str(f.eval_as_nearest_pitch(0.25))
pitches = f.eval_as_pitch(0.25)
assert 'A#:2' == str(pitches[0])
assert 'B:2' == str(pitches[1])
def test_frequencies(self):
assert is_close(ChromaticScale.get_frequency((4, 9)), 440.0), \
"Error A:4 = {0} should be 440.0".format(ChromaticScale.get_frequency((4, 9)))
assert is_close(ChromaticScale.get_frequency((4, 0)), 261.625565301), \
"Error C:4 = {0} should be 261.625565301".format(ChromaticScale.get_frequency((4, 0)))