let walker;

let t = 0;

function setup() {

  createCanvas(400,400);

  walker = new Walker();

  background(127);

}

​

function draw() {

  walker.step();

}

​

class Walker {

  constructor() {

    let n = noise(t)

    let x = map(n,0,1,0,400)

    let y = map(n,0,1,0,400)

    ellipse(x,y,180,60 )

  }

​

​

  step() {

    let choice =random(4);

    if (choice < 1) {

      this.x++;

    } 

     else {

      this.y--;

    }

    this.x = constrain(this.x, 0, width - 1);

    this.y = constrain(this.y, 0, height - 1);

  }

}