def test_invert_is_reversable(self):
"""
Ensure reversing twice generates the same sequence
"""
from sebastian.core.transforms import invert
s1 = self.make_sequence()
inverted = s1 | invert(50) | invert(50)
self.assertEqual(inverted._elements, s1._elements)
def test_invert_flips_a_sequence(self):
"""
Ensure inverting a sequence modifies the pitch
"""
from sebastian.core.transforms import invert
s1 = self.make_sequence()
inverted = s1 | invert(50)
from sebastian.core import OFFSET_64, DURATION_64, MIDI_PITCH
self.assertEqual(inverted._elements, [
{MIDI_PITCH: 50, OFFSET_64: 16, DURATION_64: 17},
{MIDI_PITCH: 47, OFFSET_64: 19, DURATION_64: 20}
])
]
assert s1 | reverse() | reverse() == s1
# stretch
assert (s1 | stretch(2))._elements == [
{MIDI_PITCH: 50, OFFSET_64: 32, DURATION_64: 32},
{MIDI_PITCH: 52, OFFSET_64: 64, DURATION_64: 32}
]
assert s1 | stretch(2) | stretch(0.5) == s1
# invert
assert (s1 | invert(50))._elements == [
{DURATION_64: 16, OFFSET_64: 16, MIDI_PITCH: 50},
{DURATION_64: 16, OFFSET_64: 32, MIDI_PITCH: 48}
]
assert s1 | invert(100) | invert(100) == s1
s4 = HSeq([Point(degree=degree) for degree in [1, 2, 3, 2, 1]])
# add
s5 = s4 | add({"octave": 4, DURATION_64: 8})
assert list(s5) == [
{'degree': 1, DURATION_64: 8, 'octave': 4},
