constructor() {

    this.position = createVector(random(width), random(height));

    this.velocity = createVector(0, 0);

    this.acceleration = createVector(-.6, 0.6);

    this.topSpeed = 10;

    this.friction = 0.95;

  }

​

  update() {

    if (keyIsDown(UP_ARROW) === true) {

      this.velocity.y -= this.acceleration.y;

    } else if (keyIsDown(DOWN_ARROW) === true) {

      this.velocity.y += this.acceleration.y;

    }

    if (keyIsDown(RIGHT_ARROW) === true) {

      this.velocity.x -= this.acceleration.x;

    } else if (keyIsDown(LEFT_ARROW) === true) {

      this.velocity.x += this.acceleration.x;

    }

    this.velocity.limit(this.topSpeed);

    this.position.add(this.velocity);

    // this.velocity.mult(this.friction);

  }

  show() {

    noStroke();

    fill(220);

    circle(this.position.x, this.position.y, 50);

  }

​

  checkEdges() {

    if (this.position.x < 0) {

      this.position.x = width;

    } else if (this.position.x > width) {

      this.position.x = 0;

    }

​

    if (this.position.y < 0) {

      this.position.y = height;

    } else if (this.position.y > height) {

      this.position.y = 0;

    }

  }

}

​