protected final void drawCan() {
			Graphics pen = null;
			final BufferStrategy b = this.getBufferStrategy();
			if (b != null) {
				pen = b.getDrawGraphics();
			}
			if (pen != null) {
				myPen.simplePen.pen = (Graphics2D) pen;
				pen.setColor(background);
				pen.fillRect(0, 0, panelWidth, panelHeight);
				pen.setColor(Color.BLACK);
				try {
					that.draw(myPen);
				} catch (final Exception e) {
					e.printStackTrace();
					System.exit(1);
				}
			}
		}