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Contents
# frozen_string_literal: true
# Module for style guidelines.
module HeadMusic::Style::Guidelines; end
# A counterpoint guideline
class HeadMusic::Style::Guidelines::AvoidOverlappingVoices < HeadMusic::Style::Annotation
MESSAGE = 'Avoid overlapping voices. Maintain the high-low relationship between voices even for adjacent notes.'
def marks
overlappings
end
private
def overlappings
overlappings_of_lower_voices + overlappings_of_higher_voices
end
def overlappings_of_lower_voices
overlappings_for_voices(lower_voices, :>)
end
def overlappings_of_higher_voices
overlappings_for_voices(higher_voices, :<)
end
def overlappings_for_voices(voices, comparison_operator)
[].tap do |marks|
voices.each do |a_voice|
overlapped_notes = overlappings_with_voice(a_voice, comparison_operator)
marks << HeadMusic::Style::Mark.for_each(overlapped_notes)
end
end.flatten.compact
end
def overlappings_with_voice(other_voice, comparison_operator)
voice.notes.drop(1).select do |note|
preceding_note = other_voice.note_preceding(note.position)
following_note = other_voice.note_following(note.position)
preceding_note&.pitch&.send(comparison_operator, note.pitch) ||
following_note&.pitch&.send(comparison_operator, note.pitch)
end
end
end
Version data entries
21 entries across 21 versions & 1 rubygems