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Versions: 33
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Stored size: 1.44 KB
Contents
class Scale(object):
ASCENDING_INTERVALS = ['m', 'M', 'A']
CHROMATIC_SCALE = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A',
'A#', 'B']
FLAT_CHROMATIC_SCALE = ['C', 'Db', 'D', 'Eb', 'E', 'F', 'Gb', 'G', 'Ab',
'A', 'Bb', 'B']
FLAT_KEYS = ['F', 'Bb', 'Eb', 'Ab', 'Db', 'Gb', 'd', 'g', 'c', 'f', 'bb',
'eb']
def __init__(self, tonic, scale_name, pattern=None):
self.tonic = tonic.capitalize()
self.name = self.tonic + ' ' + scale_name
self.pattern = pattern
self.chromatic_scale = (self.FLAT_CHROMATIC_SCALE
if tonic in self.FLAT_KEYS
else self.CHROMATIC_SCALE)
self.pitches = self._assign_pitches()
def _assign_pitches(self):
if self.pattern is None:
return self._reorder_chromatic_scale()
last_index = 0
pitches = []
scale = self._reorder_chromatic_scale()
for i, interval in enumerate(self.pattern):
pitches.append(scale[last_index])
last_index += self.ASCENDING_INTERVALS.index(interval) + 1
if pitches[0] != scale[last_index % len(scale)]:
raise ValueError("Interval is broken")
return pitches
def _reorder_chromatic_scale(self):
index = self.chromatic_scale.index(self.tonic)
return self.chromatic_scale[index:] + self.chromatic_scale[:index]
Version data entries
33 entries across 33 versions & 1 rubygems