def make_mode(self, n, mode):
'''Re-arranges the intervals of this scale into a new scale'''
# get the key distance to adjust all others by
key_dist = self.intervals[mode - 1].distance
adj_dist = []
# build a list of distances
for i in range(len(self.intervals)):
# find the interval index for this iteration with
# respect to the requested mode
step_idx = (i + (mode - 1)) % len(self.intervals)
# pull out the distance for the interval and adjust
# it by the distance of the mother-key's step
step_dist = self.intervals[step_idx].distance - key_dist
# constrain the distance to within the chromatic scale
if step_dist < 0:
step_dist += 12
# get the interval and add it to the list
adj_dist.append(Intervals.by_distance(step_dist))
# create the scale and send it out
return Scale(n, adj_dist)
from intervals import Intervals
from notes import Notes
# read intervals out for reference
peru = Intervals.by_distance(0)
min2 = Intervals.by_distance(1)
maj2 = Intervals.by_distance(2)
min3 = Intervals.by_distance(3)
maj3 = Intervals.by_distance(4)
per4 = Intervals.by_distance(5)
trit = Intervals.by_distance(6)
per5 = Intervals.by_distance(7)
min6 = Intervals.by_distance(8)
maj6 = Intervals.by_distance(9)
min7 = Intervals.by_distance(10)
maj7 = Intervals.by_distance(11)
class Scale(object):
'''Defines a collection of intervals'''
def __init__(self, n, inters):
'''Creates a scale instance'''
self.name = n
self.intervals = inters
def voice(self, key):
'''Voices this scale in a particular key'''
# get a chromatic list of notes
chromatic = Scales.make_chromatic(key)
steps = []
