​

let yoff = 0;

​

function setup() {

    createCanvas(400, 400);

}

​

function draw() {

    background(51);

    translate(width / 2, height / 2);

    //rotate(PI / 2);

​

    stroke(255);

    fill(255, 50);

    strokeWeight(1);

​

    let da = PI / 200;

    let dx = 0.05;

​

    let xoff = 0;

    beginShape();

    for (let a = 0; a <= TWO_PI; a += da) {

        let n = noise(xoff, yoff);

        let r = sin(2 * a) * map(n, 0, 1, 50, 300);

        let x = r * cos(a);

        let y = r * sin(a);

        if (a < PI) {

            xoff += dx;

        } else {

            xoff -= dx;

        }

        //point(x, y);

        vertex(x, y);

    }

    endShape();

​

    yoff += 0.01;

}