Class: Coltrane::Theory::DiatonicScale

Inherits:
Scale
  • Object
show all
Defined in:
lib/coltrane/theory/diatonic_scale.rb

Direct Known Subclasses

Key

Constant Summary

Constants included from ClassicScales

ClassicScales::SCALES

Instance Attribute Summary

Attributes inherited from Scale

#interval_sequence, #tone

Instance Method Summary collapse

Methods inherited from Scale

#&, #==, #chords, #degree, #degree_of_chord, #degree_of_note, #degrees, #id, #include_notes?, #interval, #notes, #pentads, #pretty_name, #progression, #sevenths, #size, #tertians, #triads

Methods included from ClassicScales

#fetch, #having_chords, #having_notes, #known_scales, #major, #minor, #standard_scales

Constructor Details

#initialize(tone, major: true) ⇒ DiatonicScale

Returns a new instance of DiatonicScale.



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# File 'lib/coltrane/theory/diatonic_scale.rb', line 6

def initialize(tone, major: true)
  @major = major
  tone   = Note[tone]
  notes  = CircleOfFifths.new(tone - (major? ? 0 : 9), 7).notes.sort
  super notes: notes.rotate(notes.index(tone))
end

Instance Method Details

#major? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/coltrane/theory/diatonic_scale.rb', line 29

def major?
  !!@major
end

#minor? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/coltrane/theory/diatonic_scale.rb', line 33

def minor?
  !@major
end

#name ⇒ Object 



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# File 'lib/coltrane/theory/diatonic_scale.rb', line 13

def name
  major? ? 'Major' : 'Natural Minor'
end

#relative ⇒ Object 



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# File 'lib/coltrane/theory/diatonic_scale.rb', line 25

def relative
  major? ? relative_minor : relative_major
end

#relative_major ⇒ Object 



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# File 'lib/coltrane/theory/diatonic_scale.rb', line 21

def relative_major
  major? ? self : self.class.new(@tone - 9, major: true)
end

#relative_minor ⇒ Object 



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# File 'lib/coltrane/theory/diatonic_scale.rb', line 17

def relative_minor
  minor? ? self : self.class.new(@tone + 9, major: false)
end