​

function setup() {

  createCanvas(720, 400);

  noStroke();

  chaser = new Chaser(width / 2, height / 2, 0.1);

}

​

function draw() {

  background(237, 34, 93);

  chaser.chase(mouseX, mouseY);

  chaser.present();

}

​

class Chaser{

  constructor(x, y, easing) {

    this.ox = x;

    this.oy = y;

    this.x = x;

    this.y = y;

    this.easing = easing;

  }

  chase(targetX, targetY) {

    var dx = targetX - this.x;

    var dy = targetY - this.y;

    var dist = sqrt(dx * dx + dy * dy);

    if(dist > 32) {

      this.x += dx * this.easing;

      this.y += dy * this.easing;

    }

    else {

      this.x = this.ox;

      this.y = this.oy;

    }

  }

  present() {

    fill(255);

    ellipse(this.x, this.y, 64);

  }

}