import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
 
public class SimplePaint extends JPanel {
	private boolean painting = false;
	private int currentX, currentY;
	
 	public static final int WINDOW_WIDTH = 640;
	public static final int WINDOW_HEIGHT = 480;
	
	public static void main(final String[] args) {
       		JFrame frame = new JFrame("Smile!");
 	      	frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
       		frame.setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
      	 	frame.setLocationRelativeTo(null);
       		
		SimplePaint paint = new SimplePaint();
		frame.setContentPane(paint);
		paint.init();
		
		// Important: put this after everything else.
		frame.setVisible(true);
	}
    
	public SimplePaint() {
	}

	public void init() {
		addMouseListener(new MouseAdapter() {
			public void mousePressed(MouseEvent e) {
				painting = true;
				currentX = e.getX();
				currentY = e.getY();
				repaint();
			}

			public void mouseReleased(MouseEvent e) {
				painting = false;
			}
		});
			
		addMouseMotionListener(new MouseMotionAdapter() {
			public void mouseDragged(MouseEvent e) {
				currentX = e.getX();
				currentY = e.getY();
				repaint();
			}
		});
			
			
	}		

	public void paint(Graphics g) {
		Graphics2D g2d = (Graphics2D)g;

		if (painting) {
			g.setColor(Color.green);
			g.fillOval(currentX - 4, currentY - 4, 8, 8);
			
			String coords = "X: " + currentX + " Y: " + currentY;
			
			FontMetrics metrics = g.getFontMetrics();
			Rectangle rect = metrics.getStringBounds(coords, g).getBounds();
			
			g.setColor(getBackground());
			g.fillRect(10, WINDOW_HEIGHT - 50 - rect.height, rect.width + 20, rect.height);
			g.setColor(Color.black);
			g.drawString(coords, 10, WINDOW_HEIGHT - 50);
		}
	}
		
}