if (n > 0) return 1

  if (n < 0) return -1

  return 0

}

​

function distSq(v1, v2) {

  return pow(v1.x - v2.x, 2) + pow(v1.y - v2.y, 2)

}

​

class Hand {

  constructor(x, y, c) {

    this.pos = createVector(x, y);

    this.vel = createVector();

    this.acc = createVector();

    this.chasing = c;

  }

​

  chase() {

    let ball = balls[this.chasing]

    let deltaX = ball.pos.x - this.pos.x;

    if (abs(deltaX) <= 10) {

      this.vel.set(0, 0);

      if (distSq(this.pos, ball.pos) <= 1024) {

        ball.applyForce(p5.Vector.mult(ball.vel, -1));

        ball.applyForce(antigravity);

      }

    }

    this.applyForce(createVector(sign(deltaX), 0));

  }

​

  applyForce(force) {

    this.acc.add(force);

  }

​

  update() {

    this.vel.add(this.acc);

    this.pos.add(this.vel);

    this.acc.set(0, 0);

  }

​

  display() {

    fill(255, 0, 0);

​

    rect(this.pos.x, this.pos.y, 34, 14);

  }

  throw() {

    let ball = balls[this.chasing]

    this.chasing = (this.chasing + 1) % balls.length

    let direction = p5.Vector.sub(createVector(200, -100), ball.pos).setMag(21.5);

    ball.applyForce(direction);

  }

}