Class: HeadMusic::KeySignature::EnharmonicEquivalence

Inherits:
Object
  • Object
show all
Defined in:
lib/head_music/key_signature.rb

Overview

Key signatures are enharmonic when all pitch classes in one are respellings of the pitch classes in the other.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(key_signature) ⇒ EnharmonicEquivalence

Returns a new instance of EnharmonicEquivalence.



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# File 'lib/head_music/key_signature.rb', line 116

def initialize(key_signature)
  @key_signature = HeadMusic::KeySignature.get(key_signature)
end

Instance Attribute Details

#key_signature ⇒ Object (readonly)

Returns the value of attribute key_signature.



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# File 'lib/head_music/key_signature.rb', line 114

def key_signature
  @key_signature
end

Class Method Details

.get(key_signature) ⇒ Object 



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# File 'lib/head_music/key_signature.rb', line 108

def self.get(key_signature)
  key_signature = HeadMusic::KeySignature.get(key_signature)
  @enharmonic_equivalences ||= {}
  @enharmonic_equivalences[key_signature.to_s] ||= new(key_signature)
end

Instance Method Details

#enharmonic_equivalent?(other) ⇒ Boolean Also known as: enharmonic?, equivalent?

Returns:

  • (Boolean) 


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# File 'lib/head_music/key_signature.rb', line 120

def enharmonic_equivalent?(other)
  other = HeadMusic::KeySignature.get(other)
  (key_signature.signs | other.signs).map(&:to_s).uniq.length == 12
end