let nBalls = 100;

let balls=[];

let song;

​

function preload() {

  song = loadSound("song.mp3");

}

​

function setup() {

  createCanvas(600, 600);

  song.setVolume(1);

  song.loop();

  mic = new p5.AudioIn();

  mic.start();

  fft = new p5.FFT();

  fft.setInput(mic);

​

  for(let i = 0; i<nBalls; i++){

    balls.push(new objects());

    }

}

​

function draw() {

  background(0);

  colorMode(HSB, 512, 1024, 1024, 100);

  micLevel = mic.getLevel();

    for(let i = 0; i<nBalls; i++){

        fill(colorchange(), 1024, 1000, 100);

        balls[i].draw(micLevel);

    }

}

​

class objects{

    constructor(){

        this.vx = random(-1,2);

        this.vy = random(-2,1);

        this.x = random(width);

        this.y = random(height);

        this.m = random(500, 1000);

    }

    draw(level){

        ellipse(this.x, this.y, this.m*level);

        this.x += this.vx*(1+level);

        this.y += this.vy*(1+level);

        if (this.x>width || this.x < 0){

            this.vx = -this.vx

        }

        if (this.y>height || this.y < 0){

            this.vy = -this.vy

        }

    }

}

​

function colorchange(){

  let spectrum = fft.analyze();

  let specHue = 0;

  for (let i = 0; i <spectrum.length; i++){

    let m = map(spectrum[i], 0, 255, 0, 1);

    specHue += m;

  }

  return specHue;

}