def test_tonalanalysistools_RootedChordClass_quality_pair_01():
cc = tonalanalysistools.RootedChordClass('c', 'major', 'triad', 'root')
assert cc.quality_pair == ('major', 'triad')
cc = tonalanalysistools.RootedChordClass('c', 'minor', 'triad', 'root')
assert cc.quality_pair == ('minor', 'triad')
def test_tonalanalysistools_RootedChordClass_quality_pair_02():
cc = tonalanalysistools.RootedChordClass('c', 'dominant', 'seventh', 'root')
assert cc.quality_pair == ('dominant', 'seventh')
cc = tonalanalysistools.RootedChordClass('c', 'diminished', 'seventh', 'root')
assert cc.quality_pair == ('diminished', 'seventh')
def _analyze_incomplete_chord(expr):
from abjad.tools import tonalanalysistools
pitches = pitchtools.PitchSegment.from_selection(expr)
npcset = pitchtools.PitchClassSet(
pitches, item_class=pitchtools.NamedPitchClass)
dicv = pitchtools.IntervalClassVector(
items=npcset,
item_class=pitchtools.NamedInversionEquivalentIntervalClass,
)
# TODO: eliminate code duplication #
if dicv == TonalAnalysisAgent._make_dicv('c', 'ef'):
model_npcs = ['c', 'ef']
quality, extent = 'minor', 'triad'
elif dicv == TonalAnalysisAgent._make_dicv('c', 'e'):
model_npcs = ['c', 'e']
quality, extent = 'major', 'triad'
elif dicv == TonalAnalysisAgent._make_dicv('c', 'ef', 'bff'):
model_npcs = ['c', 'ef', 'bff']
quality, extent = 'diminished', 'seventh'
elif dicv == TonalAnalysisAgent._make_dicv('c', 'ef', 'bf'):
model_npcs = ['c', 'ef', 'bf']
quality, extent = 'minor', 'seventh'
elif dicv == TonalAnalysisAgent._make_dicv('c', 'e', 'bf'):
model_npcs = ['c', 'e', 'bf']
quality, extent = 'dominant', 'seventh'
elif dicv == TonalAnalysisAgent._make_dicv('c', 'e', 'b'):
model_npcs = ['c', 'e', 'b']
quality, extent = 'major', 'seventh'
else:
message = 'can not identify incomplete tertian chord.'
raise ValueError(message)
bass = min(pitches).named_pitch_class
try:
npcseg = npcset.order_by(
pitchtools.PitchClassSegment(
model_npcs,
item_class=pitchtools.NamedPitchClass,
))
except ValueError:
message = 'can not identify incomplete tertian chord.'
raise ValueError(message)
inversion = npcseg.index(bass)
root = npcseg[0]
return tonalanalysistools.RootedChordClass(
root,
quality,
extent,
inversion,
)
def test_tonalanalysistools_RootedChordClass_root_string_01():
assert tonalanalysistools.RootedChordClass('c', 'major',
'triad').root_string == 'C'
assert tonalanalysistools.RootedChordClass('c', 'minor',
'triad').root_string == 'c'
assert tonalanalysistools.RootedChordClass('cs', 'major',
'triad').root_string == 'C#'
assert tonalanalysistools.RootedChordClass('cs', 'minor',
'triad').root_string == 'c#'
assert tonalanalysistools.RootedChordClass('cf', 'major',
'triad').root_string == 'Cb'
assert tonalanalysistools.RootedChordClass('cf', 'minor',
'triad').root_string == 'cb'
def _analyze_chord(expr):
from abjad.tools import tonalanalysistools
pitches = pitchtools.PitchSegment.from_selection(expr)
npcset = pitchtools.PitchClassSet(
pitches,
item_class=pitchtools.NamedPitchClass,
)
ordered_npcs = []
letters = ('c', 'e', 'g', 'b', 'd', 'f', 'a')
for letter in letters:
for npc in npcset:
if npc.diatonic_pitch_class_name == letter:
ordered_npcs.append(npc)
ordered_npcs = pitchtools.PitchClassSegment(
ordered_npcs, item_class=pitchtools.NamedPitchClass)
for x in range(len(ordered_npcs)):
ordered_npcs = ordered_npcs.rotate(1)
segment = \
pitchtools.IntervalClassSegment(
items=mathtools.difference_series(ordered_npcs),
item_class=pitchtools.NamedInversionEquivalentIntervalClass,
)
if segment.is_tertian:
break
else:
return None
root = ordered_npcs[0]
class_ = tonalanalysistools.RootlessChordClass
rootless_chord_class = class_.from_interval_class_segment(segment)
bass = min(pitches).named_pitch_class
inversion = ordered_npcs.index(bass)
return tonalanalysistools.RootedChordClass(
root,
rootless_chord_class.quality_string,
rootless_chord_class.extent,
inversion,
)