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First pass at extending scale function to include notes

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This commit is contained in:
Aria 2025-08-06 00:45:01 -05:00
parent ed5bf3b3fc
commit a4ab8e1b06
2 changed files with 84 additions and 43 deletions
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14
packages/tonal/tonleiter.mjs
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@ -222,6 +222,7 @@ export const Note = {
};
// TODO: support octave numbers
// Example: Note("Bb3").transpose("c3")
export function transpose(note, step) {
// example: E, 3
const stepNumber = Step.tokenize(step)[1]; // 3
@ -236,4 +237,15 @@ export function transpose(note, step) {
return [targetNote, offsetAccidentals].join('');
}
//Note("Bb3").transpose("c3")
// Converts a `scaleName` into a corresponding list of chromas between 0 and 12
export function scaleToChromas (scaleName) {
if (Array.isArray(scaleName)) {
scaleName = scaleName.flat().join(' ');
}
const [tonic, name] = Scale.tokenize(scaleName);
const rootMidi = noteToMidi(tonic);
const chroma = rootMidi % 12;
const intervals = Scale.get(name).intervals;
const scaleSteps = intervals.map(Interval.semitones);
return scaleSteps.map(s => (s + chroma) % 12);
}