Class: Stave::Core::DegreeCollection

Inherits:
Lookup
  • Object
show all
Defined in:
lib/stave/core/degree_collection.rb

Instance Attribute Summary

Attributes inherited from Lookup

#variant

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Lookup

#==, each_key, find_by, #initialize, keys, string_keys, variant, variant?, variant_lookup, variants, where, with_options

Constructor Details

This class inherits a constructor from Stave::Core::Lookup

Class Method Details

.class_key ⇒ Object 



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# File 'lib/stave/core/degree_collection.rb', line 43

def self.class_key
  to_s.delete_prefix("Stave::Theory::")
      .gsub(/([a-z])([A-Z])/, "\\1_\\2")
      .downcase
      .to_sym
end

Instance Method Details

#count ⇒ Object 



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# File 'lib/stave/core/degree_collection.rb', line 9

def count
  uniq.count
end

#degrees ⇒ Object

Set via the variants interface.

Raises:

  • (NotImplementedError) 


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# File 'lib/stave/core/degree_collection.rb', line 5

def degrees
  raise NotImplementedError
end

#intervals ⇒ Object 



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# File 'lib/stave/core/degree_collection.rb', line 13

def intervals
  degrees.map(&:interval)
end

#relative_rotate(position) ⇒ Object 



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# File 'lib/stave/core/degree_collection.rb', line 25

def relative_rotate(position)
  return degrees if position == 1

  rotated_degrees = rotate(position)

  rotated_degrees.map do |degree|
    degree - rotated_degrees.first
  end
end

#rotate(position) ⇒ Object 



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# File 'lib/stave/core/degree_collection.rb', line 17

def rotate(position)
  return degrees if position == 1

  uniq.rotate(position - 1).tap do |degrees|
    degrees << degrees.first
  end
end

#steps ⇒ Object 



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# File 'lib/stave/core/degree_collection.rb', line 35

def steps
  intervals.each_cons(2).map { |pair| pair.reverse.reduce(:-) }
end

#uniq ⇒ Object 



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# File 'lib/stave/core/degree_collection.rb', line 39

def uniq
  degrees.uniq(&:position)
end