Sha256: 63b1d989d25ec64f7e9e1936f092f4f7fc543147c5b9241128eb4d2ac9ebf575
Contents?: true
Size: 801 Bytes
Versions: 20
Compression:
Stored size: 801 Bytes
Contents
class HeadMusic::Circle
def self.of_fifths
get(7)
end
def self.of_fourths
get(5)
end
def self.get(interval = 7)
@circles ||= {}
@circles[interval.to_i] ||= new(interval)
end
attr_reader :interval, :pitch_classes
def initialize(interval)
@interval = HeadMusic::Interval.get(interval.to_i)
@pitch_classes = pitch_classes_by_interval(interval)
end
def index(pitch_class)
@pitch_classes.index(HeadMusic::Spelling.get(pitch_class).pitch_class)
end
private_class_method :new
private
def pitch_classes_by_interval(interval)
[HeadMusic::PitchClass.get(0)].tap do |list|
loop do
next_pitch_class = list.last + interval
break if next_pitch_class == list.first
list << next_pitch_class
end
end
end
end
Version data entries
20 entries across 20 versions & 1 rubygems