Class: Musicality::NoteSequence

Inherits:
Object
  • Object
show all
Defined in:
lib/musicality/performance/model/note_sequence.rb

Defined Under Namespace

Classes: Element

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(offset, separation, elements = []) ⇒ NoteSequence

Returns a new instance of NoteSequence.



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# File 'lib/musicality/performance/model/note_sequence.rb', line 24

def initialize offset, separation, elements = []
  @offset = offset
  @separation = separation
  @elements = elements
end

Instance Attribute Details

#elements ⇒ Object

Returns the value of attribute elements.



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# File 'lib/musicality/performance/model/note_sequence.rb', line 23

def elements
  @elements
end

#offset ⇒ Object Also known as: start

Returns the value of attribute offset.



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# File 'lib/musicality/performance/model/note_sequence.rb', line 23

def offset
  @offset
end

#separation ⇒ Object

Returns the value of attribute separation.



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# File 'lib/musicality/performance/model/note_sequence.rb', line 23

def separation
  @separation
end

Class Method Details

.adjust_duration(duration, separation) ⇒ Object 



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# File 'lib/musicality/performance/model/note_sequence.rb', line 6

def self.adjust_duration duration, separation
  function = case separation
  when Separation::TENUTO
    DurationFunctions::TENUTO_DURATION
  when Separation::PORTATO
    DurationFunctions::PORTATO_DURATION
  when Separation::STACCATO
    DurationFunctions::STACCATO_DURATION
  when Separation::STACCATISSIMO
    DurationFunctions::STACCATISSIMO_DURATION
  else
    DurationFunctions::NORMAL_DURATION
  end

  function.at(duration)
end

Instance Method Details

#duration ⇒ Object 



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# File 'lib/musicality/performance/model/note_sequence.rb', line 66

def duration
  stop - offset
end

#first_pitch ⇒ Object 



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# File 'lib/musicality/performance/model/note_sequence.rb', line 74

def first_pitch
  elements.first.pitch
end

#full_duration ⇒ Object 



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# File 'lib/musicality/performance/model/note_sequence.rb', line 70

def full_duration
  @elements.map {|el| el.duration }.inject(0,:+)
end

#last_attack ⇒ Object 



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# File 'lib/musicality/performance/model/note_sequence.rb', line 82

def last_attack
  elements.last.attack
end

#last_pitch ⇒ Object 



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# File 'lib/musicality/performance/model/note_sequence.rb', line 78

def last_pitch
  elements.last.pitch
end

#offsets ⇒ Object 



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# File 'lib/musicality/performance/model/note_sequence.rb', line 51

def offsets
  raise "contains no elements" if elements.empty?

  off = @offset
  elements.map do |e|
    x = off
    off += e.duration
    x
  end
end

#simplify! ⇒ Object

any consecutive elements with the same pitch and no attack will be combined



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# File 'lib/musicality/performance/model/note_sequence.rb', line 31

def simplify!
  return if @elements.none?

  prev_element = @elements[0]
  idx = 1

  while idx < @elements.size
    element = @elements[idx]
    if (element.pitch == prev_element.pitch) && (element.attack == Attack::NONE)
      prev_element.duration += element.duration
      @elements.delete_at(idx)
    else
      prev_element = element
      idx += 1
    end
  end
end

#stop ⇒ Object 



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# File 'lib/musicality/performance/model/note_sequence.rb', line 62

def stop
  offsets.last + NoteSequence.adjust_duration(elements.last.duration, separation)
end