def mutate(self, WEIGHTS, chords, count=1):
"""Mutates a random symbol
Arguments:
WEIGHTS - the default weights
chords -- the possible chords
count -- the number of symbols to mutate
"""
for _ in range(count):
i = self.select()
beats_left = convert_to_float(self.symbols[i - 1].length)
note_weights = self.set_weights(WEIGHTS, chords)
if random.randint(1, 100) < 50:
self.pop(i - 1)
else:
beats_left -= convert_to_float(self.symbols[i - 1].mutate(
WEIGHTS, note_weights, beats_left))
while beats_left > 0:
if random.randint(1, 100) < 50 or len(self.symbols) == 0:
s = Symbol()
beats_left -= convert_to_float(
s.gen(WEIGHTS, note_weights, beats_left))
if len(self.symbols) > 0:
i = self.select()
self.insert(i - 1, s)
else:
i = self.select()
beats_left += convert_to_float(self.symbols[i - 1].length)
beats_left -= convert_to_float(self.symbols[i - 1].mutate(
WEIGHTS, note_weights, beats_left))
def gen(self, WEIGHTS, chords, key, note_count, note_bar, bars):
"""Generate a random list of symbols for the measure
that fit in the necessary time signature
Arguments:
WEIGHTS -- the default weights
chords -- the possible chords
key -- the tune's key
note_count -- needed for time signature
note_bar -- needed for time signature
bars -- needed for time signature
"""
self.symbols = []
beats_left = (note_count * 1 / bars) * note_bar
note_weights = self.set_weights(WEIGHTS, chords)
while beats_left > 0:
s = Symbol()
beats_left -= convert_to_float(
s.gen(WEIGHTS, note_weights, beats_left))
self.append(s)