Class Scale

Scale class.

Hierarchy (View Summary)

KeySignature
- Scale

Constructors

constructor

new Scale(tonic: string, scaleType: ScaleType): Scale
Create nev scale object instance.
Parameters
- tonic: string
  Tonic (e.g. "C" in "C Major").
- scaleType: ScaleType
  Scale typo ("e.g. "Major" in "C Major").
Returns Scale
Overrides KeySignature.constructor

Properties

`Readonly`mode

mode: Mode

Mode: Ionian/Major = 1, Dorian = 2, ..., Locrian = 7

`Readonly`scaleType

scaleType: ScaleType

Scale typo ("e.g. "Major" in "C Major").

`Readonly`tonic

tonic: string

Tonic (e.g. "C" in "C Major").

Methods

getAccidental

getAccidental(diatonicId: number): Accidental
Get accidental for given diatonic id.
Parameters
- diatonicId: number
  Diatonic id.
Returns Accidental
- Accidental -2, -1, 0, 1 or 2.
Inherited from KeySignature.getAccidental

getAccidentalType

getAccidentalType(): AccidentalType
Get accidental type sharps, flats, or natural (without accidentals).

Returns AccidentalType
- Accidental type.
Inherited from KeySignature.getAccidentalType

getIntervalFromRootNote

getIntervalFromRootNote(note: Note): Interval
Get interval value between scale root note and given note.
Parameters
- note: Note
  Note.
Returns Interval
- Interval.

getNaturalScaleNotes

getNaturalScaleNotes(): readonly Note[]
Get natural scale notes of this key signature, natural scale has 7 steps (e.g. Major scale: W, W, H, W, W, W, H).

Returns readonly Note[]
- Array of notes.
Inherited from KeySignature.getNaturalScaleNotes

getNoteByDegree

getNoteByDegree(degree: string | number): Note
Get note of key signature by degree value.
Parameters
- degree: string | number
  Degree number in range [1, 7] or string e.g "b5" or "#4".
Returns Note
- Note.
Inherited from KeySignature.getNoteByDegree

getNumAccidentals

getNumAccidentals(): number
Get number of accidentals this key signature has.

Returns number
- Number of accidentals.
Inherited from KeySignature.getNumAccidentals

getOrderedAccidentalNotes

getOrderedAccidentalNotes(): readonly Note[]
Get accidental notes in correct order.

Returns readonly Note[]
- Array of accidental notes.
Inherited from KeySignature.getOrderedAccidentalNotes

getPreferredChromaticNote

getPreferredChromaticNote(chromaticId: number): Note
Get preferred chromatic note from given chromatic id.
Parameters
- chromaticId: number
  Chromatic id.
Returns Note
- Note.

getScaleName

getScaleName(symbolSet?: SymbolSet): string
Get scale name.
Parameters
- OptionalsymbolSet: SymbolSet
  Symbol set to format scale name in ascii or unicode.
Returns string
- Scale name string.

getScaleNotes

getScaleNotes(bottomNote: string, numOctaves: number): readonly Note[]
Get scale notes.
Parameters
- bottomNote: string
  Computed scale notes begin no lower than this note.
- numOctaves: number
  How many octaves?
Returns readonly Note[]
- Array of scale notes.

getScaleOverview

getScaleOverview(): string
Get scale overview (e.g. "C - D - E - F - G - A - B" for "C Major" scale).

Returns string
- Scale overview string.

getScaleSteps

getScaleSteps(): number[]
Get scale steps, array of 1 (half step) and 2 (whole step), (e.g. [2, 2, 1, 2, 2, 2, 1] for Major scale).

Returns number[]
- Array of scale steps.

getScaleStringSteps

getScaleStringSteps(): string[]
Get scale steps string presentation, array of "H" (half step) and "W" (whole step), (e.g. ["W", "W", "H", "W", "W", "W", "H"] for Major scale).

Returns string[]
- Array of scale steps string presentation.

isScaleNote

isScaleNote(note: Note): boolean
Test if given note is scale note.
Parameters
- note: Note
  Note to test.
Returns boolean
- True/false.

isScaleRootNote

isScaleRootNote(note: Note): boolean
Test if given note is scale root note.
Parameters
- note: Note
  Note to test.
Returns boolean
- True/false.

`Static`equals

equals(a: undefined | null | Scale, b: undefined | null | Scale): boolean
Compare if two scales equals.
Parameters
- a: undefined | null | Scale
  Scale a.
- b: undefined | null | Scale
  Scale b.
Returns boolean
- Boolean equality of given scales.
Overrides KeySignature.equals