react-orchestra
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A toolbox to build interactive and smart instruments on the web and mobile.
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<h1 class="page-title">Source: helpers/getScaleNotes.js</h1>
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<pre class="prettyprint source linenums"><code>/* mod */
import reOrderNotes from './reOrderNotes';
import isInHigherOctave from './isInHigherOctave';
import SCALES from '../constants/SCALES';
import NOTES from '../constants/NOTES';
/**
* getScaleNotes - Get notes for a given scale for _count_ octaves at _startOctave_
*
* @param {string} note noteName without octave
* @param {string} scale scaleName must be one defined in constants/SCALES
* @param {number} startOctave starting octave
* @param {number} count Number of octaves
* @returns {array} Array of note names with octave
*/
const getScaleNotes = (note, scale, startOctave, count) => {
const startingNoteIndex = NOTES.indexOf(note);
if (startingNoteIndex === -1) {
throw new Error('NOTE IS NOT RECOGNIZED');
}
if (SCALES[scale] == null) {
throw new Error('SCALE IS NOT RECOGNIZED');
}
const scaleSequence = SCALES[scale].sequence;
const notes = reOrderNotes(note);
const scaleNotes = scaleSequence.map(interval => notes[interval]);
// scaleNotes = Musician.reOrderNotes('C', scaleNotes);
let currentOctave = startOctave;
let scaleNotesWithInterval = [];
for (let i = startOctave; i < startOctave + count; i += 1) {
let previousNote = scaleNotes[0];
const currentNotes = scaleNotes.map((currentNote, j) => {
if (j === 0 && i === startOctave) {
previousNote = currentNote;
return `${currentNote}${currentOctave}`;
}
if (isInHigherOctave(previousNote, currentNote)) {
currentOctave += 1;
}
previousNote = currentNote;
return `${currentNote}${currentOctave}`;
});
scaleNotesWithInterval = [...scaleNotesWithInterval, ...currentNotes];
}
return scaleNotesWithInterval;
};
export default getScaleNotes;
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<h2><a href="index.html">Home</a></h2><h3>Classes</h3><ul><li><a href="Instrument.html">Instrument</a></li><li><a href="Note.html">Note</a></li></ul><h3>Global</h3><ul><li><a href="global.html#addOctaveToNoteName">addOctaveToNoteName</a></li><li><a href="global.html#getInterval">getInterval</a></li><li><a href="global.html#getIntervalPermutationsFromNoteNames">getIntervalPermutationsFromNoteNames</a></li><li><a href="global.html#getJSONFromMidiURL">getJSONFromMidiURL</a></li><li><a href="global.html#getNoteNamesFromChordName">getNoteNamesFromChordName</a></li><li><a href="global.html#getNoteNamesFromIntervals">getNoteNamesFromIntervals</a></li><li><a href="global.html#getScaleNotes">getScaleNotes</a></li><li><a href="global.html#getScalesFromNoteNames">getScalesFromNoteNames</a></li><li><a href="global.html#getTracksAndMetaFromParsedMidi">getTracksAndMetaFromParsedMidi</a></li><li><a href="global.html#getTracksAndMetaFromUrl">getTracksAndMetaFromUrl</a></li><li><a href="global.html#getUniqueNoteNames">getUniqueNoteNames</a></li><li><a href="global.html#getUniqueNoteNamesNoOctave">getUniqueNoteNamesNoOctave</a></li><li><a href="global.html#isInHigherOctave">isInHigherOctave</a></li><li><a href="global.html#removeOctaveFromNoteName">removeOctaveFromNoteName</a></li><li><a href="global.html#reOrderNotes">reOrderNotes</a></li><li><a href="global.html#updateTempo">updateTempo</a></li></ul>
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.4.3</a> on Sun Nov 20 2016 16:43:09 GMT+0200 (EET)
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