Este es:
import java.awt.*;import java.awt.event.ActionEvent;
import javax.swing.*;
public class SierpinskiCarpet extends JPanel {
private final int dim = 513;
private final int margin = 20;
private int limit = dim;
public SierpinskiCarpet() {
setPreferredSize(new Dimension(dim + 2 * margin, dim + 2 * margin));
setBackground(Color.white);
setForeground(Color.black);
new Timer(2000, (ActionEvent e) -> {
limit /= 3;
if (limit <= 3)
limit = dim;
repaint();
}).start();
}
void drawCarpet(Graphics2D g, int x, int y, int size) {
if (size < limit)
return;
size /= 3;
for (int i = 0; i < 9; i++) {
if (i == 4) {
g.fillRect(x + size, y + size, size, size);
} else {
drawCarpet(g, x + (i % 3) * size, y + (i / 3) * size, size);
}
}
}
@Override
public void paintComponent(Graphics gg) {
super.paintComponent(gg);
Graphics2D g = (Graphics2D) gg;
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g.translate(margin, margin);
drawCarpet(g, 0, 0, dim);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setTitle("Alfombra de Sierpinski");
f.setResizable(false);
f.add(new SierpinskiCarpet(), BorderLayout.CENTER);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
});
}
}