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Raphaël Forment
2023-08-30 12:04:49 +02:00
parent dca176cb04
commit fe0e46ec90
15 changed files with 1281 additions and 1198 deletions
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42
src/Scales.ts
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@ -50,25 +50,29 @@ const SCALES: Record<string, number[]> = {
hindustan: [0, 2, 4, 5, 7, 8, 10],
persian: [0, 1, 4, 5, 6, 8, 11],
eastIndianPurvi: [0, 1, 4, 6, 7, 8, 11],
orientalA: [0, 1, 4, 5, 6, 9, 10]
orientalA: [0, 1, 4, 5, 6, 9, 10],
};
export function scale(n: number, scaleName: string = 'major', octave: number = 4): number {
/**
* Returns the MIDI note number for the given scale degree in the given scale.
* @param {number} n - The scale degree, where 0 is the tonic.
* @param {string} scaleName - The name of the scale.
* @param {number} octave - The octave number.
* @returns {number} The MIDI note number.
*/
const scale = SCALES[scaleName];
if (!scale) {
throw new Error(`Unknown scale ${scaleName}`);
}
let index = n % scale.length;
if (index < 0) index += scale.length; // adjust for negative indexes
let additionalOctaves = Math.floor(n / scale.length);
return 60 + (octave + additionalOctaves) * 12 + scale[index];
export function scale(
n: number,
scaleName: string = "major",
octave: number = 4
): number {
/**
* Returns the MIDI note number for the given scale degree in the given scale.
* @param {number} n - The scale degree, where 0 is the tonic.
* @param {string} scaleName - The name of the scale.
* @param {number} octave - The octave number.
* @returns {number} The MIDI note number.
*/
const scale = SCALES[scaleName];
if (!scale) {
throw new Error(`Unknown scale ${scaleName}`);
}
let index = n % scale.length;
if (index < 0) index += scale.length; // adjust for negative indexes
let additionalOctaves = Math.floor(n / scale.length);
return 60 + (octave + additionalOctaves) * 12 + scale[index];
}