class Music::Performance::GlissandoConverter

Public Class Methods

glissando_elements(start_pitch, target_pitch, duration, accented) click to toggle source
# File lib/music-performance/conversion/glissando_converter.rb, line 26
def self.glissando_elements(start_pitch, target_pitch, duration, accented)
  pitches = glissando_pitches(start_pitch, target_pitch)
  subdur = Rational(duration, pitches.size)
  pitches.map do |pitch|
    LegatoElement.new(subdur, pitch, accented)
  end
end
glissando_pitches(start_pitch, target_pitch) click to toggle source
# File lib/music-performance/conversion/glissando_converter.rb, line 5
def self.glissando_pitches(start_pitch, target_pitch)
  start, finish = start_pitch.total_semitones, target_pitch.total_semitones
  if finish >= start
    semitones = start.ceil.upto(finish.floor).to_a
  else
    semitones = start.floor.downto(finish.ceil).to_a
  end
  
  if semitones.empty? || semitones[0] != start
    semitones.unshift(start)
  end
  
  if semitones.size > 1 && semitones[-1] == finish
    semitones.pop
  end
  
  semitones.map do |semitone|
    Music::Transcription::Pitch.from_semitones(semitone)
  end
end