private void updateGraphicalRepresentation() {
		ArrayList<DrawableParticle> d = new ArrayList<DrawableParticle>();
		Color c = Color.ORANGE;
		for (Particle p : this.p) {
			d.add(new DrawableParticle((int) p.x, (int) p.y, (int) Math
					.sqrt(p.mass), c));
		}
		this.pDraw = d;// atomic update
	}