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import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.font.FontRenderContext;
import java.awt.font.LineMetrics;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class FontShow extends JComponent {
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Font font = new Font("Dialog", Font.PLAIN, 96);
g2.setFont(font);
int width = getSize().width;
int height = getSize().height;
String message = "Java2s";
FontRenderContext frc = g2.getFontRenderContext();
LineMetrics metrics = font.getLineMetrics(message, frc);
float messageWidth = (float) font.getStringBounds(message, frc).getWidth();
// center text
float ascent = metrics.getAscent();
float descent = metrics.getDescent();
float x = (width - messageWidth) / 2;
float y = (height + metrics.getHeight()) / 2 - descent;
int PAD = 25;
g2.setPaint(getBackground());
g2.fillRect(0, 0, width, height);
g2.setPaint(getForeground());
g2.drawString(message, x, y);
g2.setPaint(Color.white); // Base lines
drawLine(g2, x - PAD, y, x + messageWidth + PAD, y);
drawLine(g2, x, y + PAD, x, y - ascent - PAD);
g2.setPaint(Color.green); // Ascent line
drawLine(g2, x - PAD, y - ascent, x + messageWidth + PAD, y - ascent);
g2.setPaint(Color.red); // Descent line
drawLine(g2, x - PAD, y + descent, x + messageWidth + PAD, y + descent);
}
private void drawLine(Graphics2D g2, double x0, double y0, double x1, double y1) {
Shape line = new java.awt.geom.Line2D.Double(x0, y0, x1, y1);
g2.draw(line);
}
public static void main(String args[]) {
JFrame frame = new JFrame();
frame.setSize(420, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new FontShow());
frame.setVisible(true);
}
}
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