private void updateGraphics() {
		if (isInit) {
			setBorder(BorderFactory.createTitledBorder("init"));
		} else {
			setBorder(null);
		}

		switch (aspect) {
		case POINT:
			setBackground(Color.yellow);
			setIcon(new ImageIcon("dot.jpg"));
			break;
		case VIDE:
			setBackground(Color.white);
			setIcon(null);
			break;
		case MUR:
			setBackground(Color.black);
			setIcon(new ImageIcon("wall.jpg"));
			break;
		case ANY:
		case AGENT:
			setBackground(Color.blue);
			setIcon(new ImageIcon("agent.jpg"));
			break;

		}

		// inciter à repeindre cet objet à la prochaine occasion
		repaint();
	}