Draw font base line and wraping rectangle in Java

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
//from ww  w . jav a 2s.com
import javax.swing.JComponent;
import javax.swing.JFrame;

class MyCanvas extends JComponent {
  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;

    String message = "java2s.com";

    Font f = new Font("Serif", Font.BOLD, 36);
    g2.setFont(f);

    // measure the size of the message

    FontRenderContext context = g2.getFontRenderContext();
    Rectangle2D bounds = f.getStringBounds(message, context);

    // set (x,y) = top left corner of text

    double x = (getWidth() - bounds.getWidth()) / 2;
    double y = (getHeight() - bounds.getHeight()) / 2;

    // add ascent to y to reach the baseline

    double ascent = -bounds.getY();
    double baseY = y + ascent;

    // draw the message

    g2.drawString(message, (int) x, (int) baseY);

    g2.setPaint(Color.LIGHT_GRAY);

    // draw the baseline

    g2.draw(new Line2D.Double(x, baseY, x + bounds.getWidth(), baseY));

    // draw the enclosing rectangle

    Rectangle2D rect = new Rectangle2D.Double(x, y, bounds.getWidth(), bounds.getHeight());
    g2.draw(rect);
  }
}

public class Main {
  public static void main(String[] a) {
    JFrame window = new JFrame();
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setBounds(30, 30, 450, 450);
    window.getContentPane().add(new MyCanvas());
    window.setVisible(true);
  }
}