​

function setup() {

  createCanvas(400, 400);

  fill(255,0,0);

  ball = new Ball(100,100);

}

​

function draw() {

  background(220);

  ball.update();

  ball.draw();

}

​

class Ball {

  constructor(x, y) {

    this.pos = createVector(100,100);    

    this.vel = createVector(4,3);

  }

  pointToMouse() {

    let mousePos = createVector(mouseX, mouseY);

    mousePos.sub(this.pos);

    let angleToRotate = this.vel.angleBetween(mousePos);

    this.vel.rotate(angleToRotate);

  }

  update() {

    this.pos.add(this.vel);

    this.pointToMouse();

  }

  draw() {

     circle(this.pos.x,this.pos.y,30);

  }

}