Class: HeadMusic::HarmonicInterval

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

Overview

A harmonic interval is the diatonic interval between two notes sounding together.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(voice1, voice2, position) ⇒ HarmonicInterval

Returns a new instance of HarmonicInterval.



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# File 'lib/head_music/harmonic_interval.rb', line 5

def initialize(voice1, voice2, position)
  @voice1 = voice1
  @voice2 = voice2
  @position = position.is_a?(String) ? HeadMusic::Content::Position.new(voice1.composition, position) : position
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args, &block) ⇒ Object 



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# File 'lib/head_music/harmonic_interval.rb', line 57

def method_missing(method_name, *args, &block)
  respond_to_missing?(method_name) ? diatonic_interval.send(method_name, *args, &block) : super
end

Instance Attribute Details

#position ⇒ Object (readonly)

Returns the value of attribute position.



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# File 'lib/head_music/harmonic_interval.rb', line 3

def position
  @position
end

#voice1 ⇒ Object (readonly)

Returns the value of attribute voice1.



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# File 'lib/head_music/harmonic_interval.rb', line 3

def voice1
  @voice1
end

#voice2 ⇒ Object (readonly)

Returns the value of attribute voice2.



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# File 'lib/head_music/harmonic_interval.rb', line 3

def voice2
  @voice2
end

Instance Method Details

#diatonic_interval ⇒ Object 



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# File 'lib/head_music/harmonic_interval.rb', line 11

def diatonic_interval
  @diatonic_interval ||= HeadMusic::DiatonicInterval.new(lower_pitch, upper_pitch)
end

#lower_note ⇒ Object 



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# File 'lib/head_music/harmonic_interval.rb', line 23

def lower_note
  notes.first
end

#lower_pitch ⇒ Object 



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# File 'lib/head_music/harmonic_interval.rb', line 35

def lower_pitch
  pitches.first
end

#notes ⇒ Object 



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# File 'lib/head_music/harmonic_interval.rb', line 19

def notes
  @notes ||= voices.map { |voice| voice.note_at(position) }.compact.sort_by(&:pitch)
end

#pitch_orientation ⇒ Object 



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# File 'lib/head_music/harmonic_interval.rb', line 43

def pitch_orientation
  return if lower_pitch == upper_pitch

  if lower_note.voice == voice1
    :up
  elsif lower_note.voice == voice2
    :down
  end
end

#pitches ⇒ Object 



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# File 'lib/head_music/harmonic_interval.rb', line 31

def pitches
  @pitches ||= notes.map(&:pitch).sort_by(&:to_i)
end

#respond_to_missing?(method_name, *_args) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/head_music/harmonic_interval.rb', line 61

def respond_to_missing?(method_name, *_args)
  diatonic_interval.respond_to?(method_name)
end

#to_s ⇒ Object 



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# File 'lib/head_music/harmonic_interval.rb', line 53

def to_s
  "#{diatonic_interval} at #{position}"
end

#upper_note ⇒ Object 



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# File 'lib/head_music/harmonic_interval.rb', line 27

def upper_note
  notes.last
end

#upper_pitch ⇒ Object 



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# File 'lib/head_music/harmonic_interval.rb', line 39

def upper_pitch
  pitches.last
end

#voices ⇒ Object 



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# File 'lib/head_music/harmonic_interval.rb', line 15

def voices
  [voice1, voice2].compact
end