static void forceBasedLayout(CirclesAndLines cal, final Canvas canvas) {

  awtEvery(canvas, r {

    L<Circle> circles = cal.circles;

    int n = l(circles);

    new BitSet bs;

    for (Line l : cal.lines)

      bs.set(circles.indexOf(l.a)*n+circles.indexOf(l.b));

    for (int i = 0; i < n; i++) {

      Circle a = circles.get(i);

      for (int j = 0; j < n; j++)

        if (i != j) {

          Circle b = circles.get(j);

          bool connected = bs.get(i*n+j);

          if (connected)

            forceBasedLayout_attract(a, b);

          else

            forceBasedLayout_repel(a, b);

        }

    showCAL2(cal, cal, canvas);

  }

}

static Vector forceBasedLayout_repulsionForce(Circle a, Circle b) {

  po proximity = max(distance(a.x, a.y, b.x, b.y), 0.1);

  double force = -REPULSION_CONSTANT / sqr(proximity);

  double angle = GetBearingAngle(x.Location, y.Location);

  return doublePtFromAngle(force, angle);

}

svoid forceBasedLayout_attract(Circle a, Circle b) {

  double distance = sqr(b.x-a.x)+sqr(b.y-a.y);

  double desiredDistance = 0.1;

  double distanceDelta = desiredDistance

  double dx = (b.x-a.x)*strength, dy = (b.y-a.y)*strength;

  a.x += dx*

}