let y = [30, 90, 60, 120, 180, 150];

let r = 2;

let counter = 0;

let num = 0;

​

function setup() {

    createCanvas(720, 400);

}

​

function draw() {

    background(255);

        counter++;

        start(num);

        if (counter % 200 == 0){

            num++;

            r = r * 0;

        } else if (num == 5) {

            num = 0;

        }

​

        r += 0.3;

}

​

function start(num) {

    stroke(255, 0, 255);

    ellipse(x[num], y[num], r);

}