Center text. : Font Metrics « 2D Graphics « Java Tutorial

1. Java Tutorial
2. 2D Graphics
3. Font Metrics

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;

import javax.swing.JFrame;

public class CenterTextRectangle extends JFrame {

  public static void main(String[] a) {
    CenterTextRectangle f = new CenterTextRectangle();
    f.setSize(300, 300);
    f.setVisible(true);
  }

  final Font f = new Font("SansSerif", Font.BOLD, 18);

  public void paint(Graphics g) {
    Dimension d = this.getSize();

    g.setColor(Color.white);
    g.fillRect(0, 0, d.width, d.height);
    g.setColor(Color.black);
    g.setFont(f);
    drawCenteredString("This is centered.", d.width, d.height, g);
    g.drawRect(0, 0, d.width - 1, d.height - 1);
  }

  public void drawCenteredString(String s, int w, int h, Graphics g) {
    FontMetrics fm = g.getFontMetrics();
    int x = (w - fm.stringWidth(s)) / 2;
    int y = (fm.getAscent() + (h - (fm.getAscent() + fm.getDescent())) / 2);
    g.drawString(s, x, y);
  }
}

16.24.Font Metrics
	16.24.1.	Font Metrics: the wealth of dimensional data about a font
	16.24.2.	Font base line
	16.24.3.	Getting Char with based on current font
	16.24.4.	calls stringWidth (String) to center several text messages
	16.24.5.	Center text.
	16.24.6.	Draw text to the left
	16.24.7.	Draw text to the right
	16.24.8.	Draw text to the center
	16.24.9.	Text justify
	16.24.10.	Draw font metrics
	16.24.11.	Display a text in 3 dimensions
	16.24.12.	Obtain FontMetrics of different fonts