Class: Musicality::Rhythm

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

Overview

Note:

Rests are represented by negative durations.

A rhythm based on an array of durations.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(durations) ⇒ Rhythm

Returns a new instance of Rhythm.



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# File 'lib/musicality/composition/model/rhythm.rb', line 8

def initialize durations
  if durations.find {|x| x.zero? }
    raise ArgumentError, "rhythm contains duration(s) that are zero"
  end
  @durations = durations.clone.freeze
  @durations_sum = @durations.inject(0) {|sum,x| sum + x.abs}
end

Instance Attribute Details

#durations ⇒ Object (readonly)

Returns the value of attribute durations.



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# File 'lib/musicality/composition/model/rhythm.rb', line 6

def durations
  @durations
end

#durations_sum ⇒ Object (readonly)

Returns the value of attribute durations_sum.



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# File 'lib/musicality/composition/model/rhythm.rb', line 6

def durations_sum
  @durations_sum
end

Instance Method Details

#to_notes(pitch) ⇒ Object 



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

def to_notes pitch
  @durations.map do |dur|
    if dur.negative?
      Note.new(-dur)
    else
      Note.new(dur, pitch)
    end
  end
end