@typedin/music-utilities/dist/interval-builders/Fourth.js

A set of resources and modules I use to develop music applications.

import { getNextAlteration, getPreviousAlteration } from "../helpers/index.js";
import { getAlterationForAugmentedInterval } from "./getAlteration.js";
import { getAlterationForPerfectInterval } from "./getAlterationForPerfectInterval.js";
import { getName } from "./getName.js";
import { getNoteOctave } from "./getNoteOctave.js";
const specialCases = {
    up: ["F"],
    down: ["B"],
};
const notesThatMakeOctaveChange = {
    up: ["G", "A", "B"],
    down: ["C", "D", "E"],
};
const semitones = {
    special: {
        up: 6,
        down: 6,
    },
    normal: {
        up: 5,
        down: 7,
    },
};
function getAlterationForDiminishedInterval(note, direction, specialCases) {
    if (direction == "up") {
        return specialCases[direction].includes(note.name)
            ? getPreviousAlteration(getPreviousAlteration(note.alteration))
            : getPreviousAlteration(note.alteration);
    }
    return specialCases[direction].includes(note.name)
        ? getNextAlteration(getNextAlteration(note.alteration))
        : getNextAlteration(note.alteration);
}
function DiminishedFourth(note, direction = "up") {
    return {
        name: getName(note, direction, semitones, specialCases),
        alteration: getAlterationForDiminishedInterval(note, direction, specialCases),
        octave: getNoteOctave(note, notesThatMakeOctaveChange[direction], direction),
    };
}
function PerfectFourth(note, direction = "up") {
    return {
        name: getName(note, direction, semitones, specialCases),
        alteration: getAlterationForPerfectInterval(note, direction, specialCases),
        octave: getNoteOctave(note, notesThatMakeOctaveChange[direction], direction),
    };
}
function AugmentedFourth(note, direction = "up") {
    return {
        name: getName(note, direction, semitones, specialCases),
        alteration: getAlterationForAugmentedInterval(note, direction, specialCases),
        octave: getNoteOctave(note, notesThatMakeOctaveChange[direction], direction),
    };
}
export { DiminishedFourth, PerfectFourth, AugmentedFourth };
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