public void setRadius(double visionRadius) {
		setVisionRadius(visionRadius);
		double circleX1 = (getX() - getVisionRadius());
		double circleY1 = (getY() - getVisionRadius());
		circle = new Ellipse2D.Double(circleX1, circleY1,
				getVisionRadius() * 2, getVisionRadius() * 2);
	}