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Contents
class HeadMusic::Clef
CLEFS = [
{ pitch: 'G4', line: 2, names: ['treble', 'G-clef'], modern: true },
{ pitch: 'G4', line: 1, names: ['French', 'French violin'] },
{ pitch: 'G3', line: 2, names: ['tenor'], modern: true },
{ pitch: 'F3', line: 3, names: ['baritone'] },
{ pitch: 'F3', line: 4, names: ['bass', 'F-clef'], modern: true },
{ pitch: 'F3', line: 5, names: ['sub-bass'] },
{ pitch: 'C4', line: 1, names: ['soprano'] },
{ pitch: 'C4', line: 2, names: ['mezzo-soprano'] },
{ pitch: 'C4', line: 3, names: ['alto', 'viola', 'counter-tenor', 'countertenor'], modern: true },
{ pitch: 'C4', line: 4, names: ['tenor'], modern: true },
{ pitch: 'C4', line: 5, names: ['baritone'] },
{ pitch: nil, line: 3, names: ['neutral', 'percussion'] }
]
def self.get(name)
name = name.to_s
@clefs ||= {}
key = HeadMusic::Utilities::HashKey.for(name)
@clefs[key] ||= new(name)
end
attr_reader :name, :pitch, :line
delegate :to_s, to: :name
def initialize(name)
@name = name.to_s
clef_data = CLEFS.detect { |clef| clef[:names].map(&:downcase).include?(name.downcase) }
@pitch = HeadMusic::Pitch.get(clef_data[:pitch])
@line = clef_data[:line]
end
def clef_type
"#{pitch.letter_name}-clef"
end
def line_pitch(line_number)
@line_pitches ||= {}
@line_pitches[line_number] ||= begin
steps = (line_number - line) * 2
pitch.natural_steps(steps)
end
end
def space_pitch(space_number)
@space_pitches ||= {}
@space_pitches[space_number] ||= begin
steps = (space_number - line) * 2 + 1
pitch.natural_steps(steps)
end
end
def ==(other)
to_s == other.to_s
end
end
Version data entries
16 entries across 16 versions & 1 rubygems