FontShow.java Source code

Introduction

Here is the source code for FontShow.java

Source

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);
    }
}