constructor(x, y) {

    this.pos = createVector(x, y);

    this.vel = createVector(0, 0);

    this.acc = p5.Vector.random2D();

    this.acc.mult(0.05);

    this.life = 255;

    this.done = false;

    this.hueValue = 0;

  }

  update() {

    this.finished(); 

    this.vel.add(this.acc);

    this.pos.add(this.vel);

    this.life -= 3;

    if (this.hueValue > 255) {

      this.hueValue = 0;

    }

    this.hueValue += 1;

  }

  display() {

    noStroke();

    fill(this.hueValue, 255, this.life);

    ellipse(this.pos.x, this.pos.y, 2, 2);

  }

  finished() {

    if (this.life < 0) {

      this.done = true;

    } else {

      this.done = false;

    }

  }

}