LineMetricsIllustration.java Source code

Introduction

Here is the source code for LineMetricsIllustration.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.font.FontRenderContext;
import java.awt.font.LineMetrics;
import java.awt.geom.Line2D;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class LineMetricsIllustration extends JPanel {
    public void paint(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;

        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        Font font = new Font("Serif", Font.PLAIN, 72);
        g2.setFont(font);

        String s = "Java Source and Support";
        float x = 50, y = 150;

        // Draw the baseline.
        FontRenderContext frc = g2.getFontRenderContext();
        float width = (float) font.getStringBounds(s, frc).getWidth();
        Line2D baseline = new Line2D.Float(x, y, x + width, y);
        g2.setPaint(Color.red);
        g2.draw(baseline);

        // Draw the ascent.
        LineMetrics lm = font.getLineMetrics(s, frc);
        Line2D ascent = new Line2D.Float(x, y - lm.getAscent(), x + width, y - lm.getAscent());
        g2.draw(ascent);

        // Draw the descent.
        Line2D descent = new Line2D.Float(x, y + lm.getDescent(), x + width, y + lm.getDescent());
        g2.draw(descent);

        // Draw the leading.
        Line2D leading = new Line2D.Float(x, y + lm.getDescent() + lm.getLeading(), x + width,
                y + lm.getDescent() + lm.getLeading());
        g2.draw(leading);

        // Render the string.
        g2.setPaint(Color.black);
        g2.drawString(s, x, y);
    }

    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.getContentPane().add(new LineMetricsIllustration());
        f.setSize(850, 250);
        f.show();

    }
}