Sha256: 96118478a550b82a00242d09ed2f0ce35751762a3e9bede66f7af46c6b77b6ff
Contents?: true
Size: 1003 Bytes
Versions: 5
Compression:
Stored size: 1003 Bytes
Contents
# frozen_string_literal: true # A Circle of Fifths or Fourths shows relationships between pitch classes # TODO: Replace or empower with IntervalCycle (?) # https://en.wikipedia.org/wiki/Interval_cycle 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
5 entries across 5 versions & 1 rubygems