def set_melodic_figures(nested_scale_degrees):
chosen_figurations = []
melodic_figures = {
(2, (1, )): "IPT",
(0, (2, 1)): "DCN",
(2, (-1, 1)): "OPT",
(0, (-1, )): "CN",
(1, (-1, )): "PIN",
(1, (2, )): "CIN",
(1, (-2, -1)): "OPT",
(4, (2, )): "IPT",
(3, (4, )): "CIN",
(3, (1, )): "IPT",
(1, (0, )): "RET",
(2, (2, )): "ANT",
(3, (2, )): "IPT",
(3, (1, 3)): "ANT",
(2, (2, 3)): "OPT",
(4, (1, 2)): "IPT",
(1, (-2, )): "OPT",
(1, (-1, 0)): "OPT",
(3, (1, 2)): "IPT",
(5, (3, )): "5PT",
(0, (1, )): "CN",
(1, (1, )): "ANT"
}
chord_index = 0
for previous_melody_group, current_melody_group in zip(
nested_scale_degrees, nested_scale_degrees[1:]):
chord_index += 1
figure_group = []
main_pitch_diff = current_melody_group[0] - previous_melody_group[0]
main_pitch_direction = Voice.calculate_slope(main_pitch_diff)
main_pitch_diff = abs(main_pitch_diff)
embellish_degrees = previous_melody_group[1:]
if not embellish_degrees:
chosen_figurations.append(None)
continue
for previous_melody_note in embellish_degrees:
pitch_diff = previous_melody_note - previous_melody_group[0]
pitch_direction = Voice.calculate_slope(pitch_diff)
if pitch_direction == 0:
reference_direction = 0
if 0 != main_pitch_direction == pitch_direction:
reference_direction = 1 * abs(pitch_diff)
elif 0 != main_pitch_direction != pitch_direction:
reference_direction = -1 * abs(pitch_diff)
elif main_pitch_direction == 0:
reference_direction = pitch_diff
figure_group.append(reference_direction)
figure_group = tuple(figure_group)
if chord_index == 8:
modifier = "PICK_"
else:
modifier = ""
chosen_figurations.append(modifier + melodic_figures[(main_pitch_diff,
figure_group)])
print(chosen_figurations)
return chosen_figurations
def has_melody_figure(self):
"""Check specific melody against figuration options"""
last_rhythm_symbol = self.rhythm_symbols[self.chord_index - 1]
if last_rhythm_symbol == -1:
if self.chord_index == 15:
section3 = Voice.merge_lists(*self.nested_scale_degrees[8:12])
section4 = Voice.merge_lists(*self.nested_scale_degrees[12:14])
if max(section3) <= max(section4):
return False
self.nested_scale_degrees[self.chord_index -
1] = [self.previous_degree_choice]
return True
if last_rhythm_symbol == -2:
self.melody_figure_options[self.chord_index -
1] = (self.get_pickup_sequences(
self.current_degree_choice))
return self.add_valid_figure()
remaining_figures = self.melody_figure_options[self.chord_index - 1]
if remaining_figures:
return self.add_valid_figure()
degree_mvmt = self.current_degree_choice - self.previous_degree_choice
melody_slope = Voice.calculate_slope(degree_mvmt)
degree_mvmt = abs(degree_mvmt)
embellish_amount = len(self.finalized_rhythms[self.chord_index - 1])
if embellish_amount == 2:
all_figurations = self.all_single_figurations
elif embellish_amount == 3:
all_figurations = self.all_double_figurations
possible_scale_degrees = all_figurations[degree_mvmt](
self.previous_degree_choice, self.current_degree_choice,
melody_slope)
self.melody_figure_options[self.chord_index -
1] = possible_scale_degrees
return self.add_valid_figure()
def set_melodic_figures(nested_scale_degrees):
"""Defines figurations found in actual music"""
chosen_figurations = []
"""
IPT = inner passing tone
OPT = outer passing tone
ANT = anticipation
RET = retardation
CIN = current incomplete neighbor
PIN = previous incomplete neighbor
DN = double neighbor
CN = complete neighbor
DCN = double complete neighbor
Format of keys: (degree difference between base notes, (figurations))
"""
melodic_figures = {
(2, (1, )): "IPT",
(0, (2, 1)): "DCN",
(2, (-1, 1)): "OPT",
(0, (-1, )): "CN",
(1, (-1, )): "PIN",
(1, (2, )): "CIN",
(1, (-2, -1)): "OPT",
(4, (2, )): "IPT",
(3, (4, )): "CIN",
(3, (1, )): "IPT",
(1, (0, )): "RET",
(2, (2, )): "ANT",
(3, (2, )): "IPT",
(3, (1, 3)): "ANT",
(2, (2, 3)): "OPT",
(4, (1, 2)): "IPT",
(1, (-2, )): "OPT",
(1, (-1, 0)): "OPT",
(3, (1, 2)): "IPT",
(5, (3, )): "5PT",
(0, (1, )): "CN",
(1, (1, )): "ANT"
}
chord_index = 0
for previous_melody_group, current_melody_group in zip(
nested_scale_degrees, nested_scale_degrees[1:]):
chord_index += 1
figure_group = []
main_pitch_diff = current_melody_group[0] - previous_melody_group[0]
main_pitch_direction = Voice.calculate_slope(main_pitch_diff)
main_pitch_diff = abs(main_pitch_diff)
embellish_degrees = previous_melody_group[1:]
if not embellish_degrees:
chosen_figurations.append(None)
continue
for previous_melody_note in embellish_degrees:
pitch_diff = previous_melody_note - previous_melody_group[0]
pitch_direction = Voice.calculate_slope(pitch_diff)
if pitch_direction == 0:
reference_direction = 0
if 0 != main_pitch_direction == pitch_direction:
reference_direction = 1 * abs(pitch_diff)
elif 0 != main_pitch_direction != pitch_direction:
reference_direction = -1 * abs(pitch_diff)
elif main_pitch_direction == 0:
reference_direction = pitch_diff
figure_group.append(reference_direction)
figure_group = tuple(figure_group)
if chord_index == 8:
modifier = "PICK_"
else:
modifier = ""
chosen_figurations.append(modifier + melodic_figures[(main_pitch_diff,
figure_group)])
print(chosen_figurations)
return chosen_figurations
def test_slopes(self): self.assertEqual(Voice.calculate_slope(0), 0) self.assertEqual(Voice.calculate_slope(1), 1) self.assertEqual(Voice.calculate_slope(-1), -1) self.assertEqual(Voice.calculate_slope(5), 1) self.assertEqual(Voice.calculate_slope(-3), -1)