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Versions: 20
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Contents
class HeadMusic::PitchClass
attr_reader :number
SHARP_SPELLINGS = %w[C C# D D# E F F# G G# A A# B]
FLAT_SPELLINGS = %w[C Db D Eb E F Gb G Ab A Bb B]
def self.get(identifier)
@pitch_classes ||= {}
number = HeadMusic::Spelling.get(identifier).pitch_class.to_i if HeadMusic::Spelling.match(identifier)
number ||= identifier.to_i % 12
@pitch_classes[number] ||= new(number)
end
class << self
alias_method :[], :get
end
def initialize(pitch_class_or_midi_number)
@number = pitch_class_or_midi_number.to_i % 12
end
def to_i
number
end
def +(semitones)
HeadMusic::PitchClass.get(to_i + semitones.to_i)
end
def -(semitones)
HeadMusic::PitchClass.get(to_i - semitones.to_i)
end
def ==(value)
to_i == value.to_i
end
alias_method :enharmonic?, :==
def intervals_to(other)
delta = other.to_i - to_i
inverse = delta > 0 ? delta - 12 : delta + 12
[delta, inverse].sort_by(&:abs).map { |interval| HeadMusic::Interval.get(interval) }
end
def smallest_interval_to(other)
intervals_to(other).first
end
private_class_method :new
end
Version data entries
20 entries across 20 versions & 1 rubygems