import java.awt.*;
import java.awt.event.*;

public class BullsEyeApplet extends java.applet.Applet { 
	public void init() {
		setLayout( new BorderLayout() );
		add( "Center", new BullsEyeComponent() );
	}
}

class BullsEyeComponent extends Component {
	final int RADIUS=20, RINGS=6;
	Point point = new Point();

	BullsEyeComponent() {
		addMouseMotionListener( new MouseMotionAdapter() {
			public void mouseDragged(MouseEvent e) { 
				point = e.getPoint();
				repaint();
			} 
		} );
	}
	public void paint( Graphics g ) {
		for (int i=0; i<RINGS; i++) {
			int r = RADIUS - RADIUS/RINGS*i;
			g.setColor( (i%2 != 0)? Color.red : Color.black );
			g.fillOval( point.x - r, point.y - r, r*2, r*2 );
		}
	}
}