private void drawForceLines(Graphics2D g, List lines, Stroke stroke) {
		if (lines == null || lines.isEmpty())
			return;
		g.setColor(contrastBackground());
		g.setStroke(stroke);
		int[] pair;
		synchronized (lines) {
			for (Iterator it = lines.iterator(); it.hasNext();) {
				pair = (int[]) it.next();
				g.drawLine((int) atom[pair[0]].getRx(), (int) atom[pair[0]].getRy(), (int) atom[pair[1]].getRx(), (int) atom[pair[1]].getRy());
			}
		}
	}