@Override
	public void step(TestbedSettings settings) {

		super.step(settings);

		for (Body b = getWorld().getBodyList(); b != null; b = b.getNext())
		{
			if (b.getType() != BodyType.DYNAMIC)
			{
				continue;
			}

			Vec2 p = b.getPosition();
			if (p.x <= -10.0f || 10.0f <= p.x || p.y <= 0.0f || 20.0f <= p.y)
			{
				p.x += 0.0;
			}
		}

		addTextLine("Press 'c' to create a circle");
	}