def test_reverse_is_reversable(self):
"""
Ensure that a double reverse of a sequence is idempotent
"""
from sebastian.core.transforms import reverse
s1 = self.make_sequence()
reversed = s1 | reverse() | reverse()
self.assertEqual(s1._elements, reversed._elements)
def test_reverse_is_reversable(self):
"""
Ensure that a double reverse of a sequence is idempotent
"""
from sebastian.core.transforms import reverse
s1 = self.make_sequence()
reversed = s1 | reverse() | reverse()
self.assertEqual(s1._elements, reversed._elements)
def test_reversed_doesnt_modify_next_offset(self):
"""
Ensure reversed sequences are the same length as their input
"""
from sebastian.core.transforms import reverse
s1 = self.make_sequence()
reversed = s1 | reverse()
self.assertEqual(s1.next_offset(), reversed.next_offset())
def test_reversed_doesnt_modify_next_offset(self):
"""
Ensure reversed sequences are the same length as their input
"""
from sebastian.core.transforms import reverse
s1 = self.make_sequence()
reversed = s1 | reverse()
self.assertEqual(s1.next_offset(), reversed.next_offset())
def test_reverse(self):
"""
Ensure puts points in a sequence backwards
"""
from sebastian.core.transforms import reverse
s1 = self.make_sequence()
reversed = s1 | reverse()
from sebastian.core import OFFSET_64, DURATION_64, MIDI_PITCH
self.assertEqual(reversed._elements, [
{MIDI_PITCH: 53, OFFSET_64: 0, DURATION_64: 20},
{MIDI_PITCH: 50, OFFSET_64: 6, DURATION_64: 17},
{OFFSET_64: 39}
])
def test_reverse(self):
"""
Ensure puts points in a sequence backwards
"""
from sebastian.core.transforms import reverse
s1 = self.make_sequence()
reversed = s1 | reverse()
from sebastian.core import OFFSET_64, DURATION_64
self.assertEqual(reversed._elements, [{
"pitch": 53,
OFFSET_64: 0,
DURATION_64: 20
}, {
"pitch": 50,
OFFSET_64: 6,
DURATION_64: 17
}, {
OFFSET_64: 39
}])
from sebastian.lilypond.interp import parse
from sebastian.lilypond.write_lilypond import write
from sebastian.midi import write_midi, player
from sebastian.core import OSequence, HSeq, Point, DURATION_64
from sebastian.core.transforms import transpose, reverse, add, degree_in_key, midi_pitch, lilypond
from sebastian.core.notes import Key, major_scale
# construct sequences using lilypond syntax
seq1 = parse("c d e")
seq2 = parse("e f g")
# concatenate
seq3 = seq1 + seq2
# transpose and reverse
seq4 = seq3 | transpose(12) | reverse()
# merge
seq5 = seq3 // seq4
# play MIDI
player.play([seq5])
# write to MIDI
write_midi.write("seq5.mid", [seq5])
# contruct a horizontal sequence of scale degrees
seq6 = HSeq(Point(degree=degree) for degree in [1, 2, 3, 2, 1])
# put that sequence into C major, octave 4 quavers
C_MAJOR = Key("C", major_scale)
def mound(seq):
return seq + (seq | reverse())
from sebastian.lilypond.interp import parse
from sebastian.lilypond.write_lilypond import write
from sebastian.midi import write_midi, player
from sebastian.core import OSequence, HSeq, Point, DURATION_64
from sebastian.core.transforms import transpose, reverse, add, degree_in_key, midi_pitch, lilypond
from sebastian.core.notes import Key, major_scale
# construct sequences using lilypond syntax
seq1 = parse("c d e")
seq2 = parse("e f g")
# concatenate
seq3 = seq1 + seq2
# transpose and reverse
seq4 = seq3 | transpose(12) | reverse()
# merge
seq5 = seq3 // seq4
# play MIDI
player.play([seq5])
# write to MIDI
write_midi.write("seq5.mid", [seq5])
# contruct a horizontal sequence of scale degrees
seq6 = HSeq(Point(degree=degree) for degree in [1, 2, 3, 2, 1])
# put that sequence into C major, octave 4 quavers
C_MAJOR = Key("C", major_scale)
## point transformation
from sebastian.core.transforms import transpose, reverse, stretch, invert, add, degree_in_key, midi_pitch
# transpose
assert (s1 | transpose(12))._elements == [
{MIDI_PITCH: 62, OFFSET_64: 16, DURATION_64: 16},
{MIDI_PITCH: 64, OFFSET_64: 32, DURATION_64: 16}
]
assert s1 | transpose(5) | transpose(-5) == s1
# reverse
assert (s1 | reverse())._elements == [
{MIDI_PITCH: 52, OFFSET_64: 0, DURATION_64: 16},
{MIDI_PITCH: 50, OFFSET_64: 16, DURATION_64: 16},
{OFFSET_64: 48}
]
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
