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Contents
# frozen_string_literal: true
module Coltrane
module Cli
# Renders notes in a common most popular ukulele scheme
class Guitar < Representation
SPECIAL_FRETS = [3, 5, 7, 9, 12, 15, 17, 19].freeze
include Color
def initialize(notes, flavor, tuning: %w[E A D G B E], frets: 22)
@notes = notes
@tuning = tuning.reverse
@frets = frets
@flavor = flavor
@ref_note = @notes.first
end
def render
[render_notes, render_special_frets, hint].join("\n" * 2)
end
def render_notes
@tuning.each_with_index.map do |string, str_i|
string_note = Note[string]
Array.new(@frets + 2) do |i|
if i.zero?
Paint[string, HSL.new(140 + str_i * 20,50,50).html]
else
fret = i - 1
note = string_note + fret
m = (@notes.include?(note) ? place_mark(note) : place_empty(str_i))
fret.zero? ? (m + ' |') : m
end
end.join(' ')
end.join("\n")
end
def render_special_frets
' ' +
Array.new(@frets + 2) do |fret|
m = SPECIAL_FRETS.include?(fret) ? fret.to_s.rjust(2, 0.to_s) : ' '
"#{m}#{' ' if fret.zero?}"
end.join(' ')
end
def place_empty(str_i)
Paint['--', HSL.new(180 + str_i * 3,50,30).html]
end
def place_mark(note)
mark =
case @flavor
when :notes then note.pretty_name.ljust(2, ' ')
when :intervals then (@ref_note - note).name.ljust(2, '-')
when :degrees then @notes.degree(note).to_s.rjust(2, '0')
when :marks then ' ' # '◼◼'
else raise WrongFlavorError
end
base_hue = (180 + note.number * 10) % 360 # + 260
Paint[
mark,
HSL.new(0, 0, 100).html,
HSL.new(base_hue, 100, 30).html
]
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems