Class: Musicality::Scale

Inherits:
Object
  • Object
show all
Defined in:
lib/musicality/composition/model/scale.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pitch_class, intervals) ⇒ Scale

Returns a new instance of Scale.



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# File 'lib/musicality/composition/model/scale.rb', line 5

def initialize pitch_class, intervals
  @pitch_class = pitch_class
  @intervals = intervals
end

Instance Attribute Details

#pitch_class ⇒ Object (readonly)

Returns the value of attribute pitch_class.



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# File 'lib/musicality/composition/model/scale.rb', line 4

def pitch_class
  @pitch_class
end

Instance Method Details

#at_octave(octave) ⇒ Object 



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# File 'lib/musicality/composition/model/scale.rb', line 28

def at_octave octave
  start_pitch = Pitch.new(octave: octave, semitone: @pitch_class)
  AddingSequence.new(@intervals, start_pitch)
end

#intervals ⇒ Object 



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# File 'lib/musicality/composition/model/scale.rb', line 10

def intervals; @intervals.entries; end

#rotate(n) ⇒ Object 



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# File 'lib/musicality/composition/model/scale.rb', line 21

def rotate n
  diff = AddingSequence.new(@intervals).at(n)
  new_pc = (@pitch_class + diff).to_pc
  new_intervals = @intervals.rotate(n)
  Scale.new(new_pc,new_intervals)
end

#size ⇒ Object 



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# File 'lib/musicality/composition/model/scale.rb', line 12

def size
  @intervals.size
end

#transpose(diff) ⇒ Object 



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# File 'lib/musicality/composition/model/scale.rb', line 16

def transpose diff
  new_pc = (@pitch_class + diff).to_pc
  Scale.new(new_pc,@intervals)
end