class MusicTheory::Note
Attributes
octave[R]
pitch[R]
Public Class Methods
new(pitch=:c, octave=1)
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# File lib/lygre/musictheory.rb, line 7 def initialize(pitch=:c, octave=1) @pitch = pitch @pitch_numeric = PITCHES.index @pitch @octave = octave if @pitch_numeric.nil? raise ArgumentError.new("Invalid pitch #{pitch.inspect}") end end
Public Instance Methods
==(other)
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# File lib/lygre/musictheory.rb, line 35 def ==(other) other.pitch == @pitch && other.octave == @octave end
diatonic_steps(steps)
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# File lib/lygre/musictheory.rb, line 19 def diatonic_steps(steps) base_steps = steps % PITCHES.size octaves = steps / PITCHES.size new_step = @pitch_numeric + base_steps if new_step >= PITCHES.size new_step -= PITCHES.size octaves += 1 end new_pitch = PITCHES[new_step] self.class.new(new_pitch, @octave + octaves) end
hash()
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# File lib/lygre/musictheory.rb, line 40 def hash [@pitch, @octave].hash end
value()
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# File lib/lygre/musictheory.rb, line 31 def value (@octave + 4) * 12 + VALUES[@pitch_numeric] end