Sha256: ca93d08e216d450f50a82e997cb7e7cea6e91d4686bf1b84471bce838a936966
Contents?: true
Size: 1001 Bytes
Versions: 8
Compression:
Stored size: 1001 Bytes
Contents
class HeadMusic::Interval
include Comparable
private_class_method :new
NAMES = %w{perfect_unison minor_second major_second minor_third major_third perfect_fourth tritone perfect_fifth minor_sixth major_sixth minor_seventh major_seventh perfect_octave}
attr_reader :semitones
def self.get(semitones)
@intervals ||= {}
@intervals[semitones.to_i] ||= new(semitones.to_i)
end
singleton_class.send(:alias_method, :[], :get)
def self.named(name)
name = name.to_s
get(NAMES.index(name)) if NAMES.include?(name)
end
def initialize(semitones)
@semitones = semitones
end
def simple
HeadMusic::Interval.get(semitones % 12)
end
def simple?
(0..12).include?(semitones)
end
def compound?
semitones > 12
end
def to_i
semitones
end
def +(value)
HeadMusic::Interval.get(to_i + value.to_i)
end
def -(value)
HeadMusic::Interval.get((to_i - value.to_i).abs)
end
def <=>(other)
self.to_i <=> other.to_i
end
end
Version data entries
8 entries across 8 versions & 1 rubygems