private Color getColor(Edge edge) {
		if (edge == null) {
			return Color.WHITE;
		} else if (edge.getEdgeState() == EdgeState.BURNED) {
			return Color.GREEN;
		} else if (edge.getEdgeState() == EdgeState.CLOSED) {
			return Color.BLUE;
		} else {
			return Color.BLACK;
		}
	}