@tsparticles/path-curves/browser/Curves.js

tsParticles curves path

import { getRandom } from "@tsparticles/engine";
export function CurvesPathGen(rndFunc, period, nbHarmonics, attenHarmonics, lowValue = 0, highValue = 1) {
    const arP0 = [], arP1 = [], amplitudes = [], increments = [], phases = [], randomFunc = rndFunc ?? getRandom;
    let globAmplitude = 0;
    if (nbHarmonics < 1)
        nbHarmonics = 1;
    for (let kh = 1; kh <= nbHarmonics; ++kh) {
        arP0[kh] = randomFunc();
        arP1[kh] = randomFunc();
        amplitudes[kh] = kh === 1 ? 1 : amplitudes[kh - 1] * attenHarmonics;
        globAmplitude += amplitudes[kh];
        increments[kh] = kh / period;
        phases[kh] = randomFunc();
    }
    amplitudes.forEach((value, kh) => (amplitudes[kh] = (value / globAmplitude) * (highValue - lowValue)));
    return () => {
        let pf, pfl, signal = 0;
        for (let kh = nbHarmonics; kh >= 1; --kh) {
            pf = phases[kh] += increments[kh];
            if (phases[kh] >= 1) {
                pf = phases[kh] -= 1;
                arP0[kh] = arP1[kh];
                arP1[kh] = randomFunc();
            }
            pfl = pf ** 2 * (3 - 2 * pf);
            signal += (arP0[kh] * (1 - pfl) + arP1[kh] * pfl) * amplitudes[kh];
        }
        return signal + lowValue;
    };
}