Class: HeadMusic::DiatonicInterval::Size

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

Overview

Encapsulate the distance methods of the interval

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pitch1, pitch2) ⇒ Size

Returns a new instance of Size.



153
154
155
 
# File 'lib/head_music/diatonic_interval.rb', line 153

def initialize(pitch1, pitch2)
  @low_pitch, @high_pitch = *[pitch1, pitch2].sort
end

Instance Attribute Details

#high_pitch ⇒ Object (readonly)

Returns the value of attribute high_pitch.



151
152
153
 
# File 'lib/head_music/diatonic_interval.rb', line 151

def high_pitch
  @high_pitch
end

#low_pitch ⇒ Object (readonly)

Returns the value of attribute low_pitch.



151
152
153
 
# File 'lib/head_music/diatonic_interval.rb', line 151

def low_pitch
  @low_pitch
end

Instance Method Details

#compound? ⇒ Boolean

Returns:

  • (Boolean) 


173
174
175
 
# File 'lib/head_music/diatonic_interval.rb', line 173

def compound?
  !simple?
end

#number ⇒ Object 



157
158
159
 
# File 'lib/head_music/diatonic_interval.rb', line 157

def number
  @number ||= @low_pitch.steps_to(@high_pitch) + 1
end

#octaves ⇒ Object 



165
166
167
 
# File 'lib/head_music/diatonic_interval.rb', line 165

def octaves
  @octaves ||= number / 8
end

#semitones ⇒ Object 



181
182
183
 
# File 'lib/head_music/diatonic_interval.rb', line 181

def semitones
  (high_pitch - low_pitch).to_i
end

#simple? ⇒ Boolean

Returns:

  • (Boolean) 


169
170
171
 
# File 'lib/head_music/diatonic_interval.rb', line 169

def simple?
  number <= 8
end

#simple_number ⇒ Object 



161
162
163
 
# File 'lib/head_music/diatonic_interval.rb', line 161

def simple_number
  @simple_number ||= octave_equivalent? ? 8 : (number - 1) % 7 + 1
end

#simple_semitones ⇒ Object 



177
178
179
 
# File 'lib/head_music/diatonic_interval.rb', line 177

def simple_semitones
  @simple_semitones ||= semitones % 12
end

#simple_steps ⇒ Object 



189
190
191
 
# File 'lib/head_music/diatonic_interval.rb', line 189

def simple_steps
  steps % 7
end

#steps ⇒ Object 



185
186
187
 
# File 'lib/head_music/diatonic_interval.rb', line 185

def steps
  number - 1
end