Module: MusicUtils::Scales
- Included in:
- MusicUtils, Interval
- Defined in:
- lib/music-utils/scales/scales.rb
Overview
Scales module
Constant Summary collapse
- DO =
Notes
:do
- RE =
:re
- MI =
:mi
- FA =
:fa
- SOL =
:sol
- LA =
:la
- SI =
:si
- DIATONIC_SCALE =
[DO, RE, MI, FA, SOL, LA, SI]
- FLAT =
Alterations:
'f'
- DFLAT =
FLAT + FLAT
- SHARP =
's'
- DSHARP =
SHARP + SHARP
- DOF =
Altered notes
(DO.to_s + FLAT).to_sym
- DOFF =
(DO.to_s + DFLAT).to_sym
- DOS =
(DO.to_s + SHARP).to_sym
- DOSS =
(DO.to_s + DSHARP).to_sym
- REF =
(RE.to_s + FLAT).to_sym
- REFF =
(RE.to_s + DFLAT).to_sym
- RES =
(RE.to_s + SHARP).to_sym
- RESS =
(RE.to_s + DSHARP).to_sym
- MIF =
(MI.to_s + FLAT).to_sym
- MIFF =
(MI.to_s + DFLAT).to_sym
- MIS =
(MI.to_s + SHARP).to_sym
- MISS =
(MI.to_s + DSHARP).to_sym
- FAF =
(FA.to_s + FLAT).to_sym
- FAFF =
(FA.to_s + DFLAT).to_sym
- FAS =
(FA.to_s + SHARP).to_sym
- FASS =
(FA.to_s + DSHARP).to_sym
- SOLF =
(SOL.to_s + FLAT).to_sym
- SOLFF =
(SOL.to_s + DFLAT).to_sym
- SOLS =
(SOL.to_s + SHARP).to_sym
- SOLSS =
(SOL.to_s + DSHARP).to_sym
- LAF =
(LA.to_s + FLAT).to_sym
- LAFF =
(LA.to_s + DFLAT).to_sym
- LAS =
(LA.to_s + SHARP).to_sym
- LASS =
(LA.to_s + DSHARP).to_sym
- SIF =
(SI.to_s + FLAT).to_sym
- SIFF =
(SI.to_s + DFLAT).to_sym
- SIS =
(SI.to_s + SHARP).to_sym
- SISS =
(SI.to_s + DSHARP).to_sym
- CROMATIC_SCALE =
[[SIS, DO, REFF], [SISS, DOS, REF], [DOSS, RE, MIFF], [RES, MIF, FAFF], [RESS, MI, FAF], [MIS, FA, SOLFF], [MISS, FAS, SOLF], [FASS, SOL, LAFF], [SOLS, LAF], [SOLSS, LA, SIFF], [LAS, SIF], [LASS, SI, DOF]]
- MAJ_SCALE =
[2, 2, 1, 2, 2, 2, 1]
- NATURAL_MIN_SCALE =
[2, 1, 2, 2, 1, 2, 2]
- MELODIC_MIN_SCALE =
[2, 1, 2, 2, 1, 2, 1]
- PERF =
Qualities
'P'
- MAJ =
'M'
- MIN =
'm'
- AUG =
'A'
- AUGP =
AUG + AUG
- DIM =
'd'
- DIMP =
DIM + DIM
- QUALITIES =
Qualities hash
{ 2 => {0 => DIM, 1 => MIN, 2 => MAJ, 3 => AUG, 4 => AUGP}, 3 => {1 => DIMP, 2 => DIM, 3 => MIN, 4 => MAJ, 5 => AUG, 6 => AUGP}, 4 => {3 => DIMP, 4 => DIM, 5 => PERF, 6 => AUG, 7 => AUGP}, 5 => {5 => DIMP, 6 => DIM, 7 => PERF, 8 => AUG, 9 => AUGP}, 6 => {7 => DIMP, 8 => DIM, 9 => MIN, 10 => MAJ, 11 => AUG, 12 => AUGP}, 7 => {8 => DIMP, 9 => DIM, 10 => MIN, 11 => MAJ, 12 => AUG, 13 => AUGP}, 8 => {10 => DIMP, 11 => DIM, 12 => PERF, 13 => AUG, 14 => AUGP} }
Class Method Summary collapse
-
.cromatic_index(from) ⇒ Object
Returns index of the note in the cromatic scale.
-
.diatonic_scale_from(from) ⇒ Object
Create a diatonic scale starting with the “from” note.
-
.scale(from, scale_struct) ⇒ Object
Create scale from a note and scale structure.
Class Method Details
.cromatic_index(from) ⇒ Object
Returns index of the note in the cromatic scale
151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 |
# File 'lib/music-utils/scales/scales.rb', line 151 def Scales.cromatic_index(from) i = 0 find_it = false CROMATIC_SCALE.each do |e| if e.is_a?(Array) e.each do |ee| find_it = true if from == ee end else find_it = true if from == e end break if find_it i += 1 end i end |
.diatonic_scale_from(from) ⇒ Object
Create a diatonic scale starting with the “from” note
134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 |
# File 'lib/music-utils/scales/scales.rb', line 134 def Scales.diatonic_scale_from(from) diatonic_scale = [] length = DIATONIC_SCALE.length i = DIATONIC_SCALE.index(from) c = 0 while c < length diatonic_scale << DIATONIC_SCALE[i] i += 1 c += 1 if i > length - 1 i = 0 end end diatonic_scale end |
.scale(from, scale_struct) ⇒ Object
Create scale from a note and scale structure
97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 |
# File 'lib/music-utils/scales/scales.rb', line 97 def Scales.scale(from, scale_struct) from = from.to_sym i = cromatic_index(from) scale = [] scale << from from_note, from_alter = MusicUtils::Note.parse(from) diatonic_scale = diatonic_scale_from(from_note) diatonic_scale.delete(from_note) length = CROMATIC_SCALE.length scale_struct.each do |shift| if i + shift > length - 1 i = (i + shift) - (length) shift = 0 end CROMATIC_SCALE[i + shift].each do |e| e_note, e_alter = MusicUtils::Note.parse(e) if diatonic_scale.first == e_note scale << e diatonic_scale.delete(diatonic_scale.first) break end end i += shift end scale end |