import java.awt.*;
import java.awt.event.ActionEvent;
import javax.swing.*;
import javax.swing.Timer;

public class WolframCA extends JPanel {
    final int[] ruleSet = {30, 45, 50, 57, 62, 70, 73, 75, 86, 89, 90, 99,
        101, 105, 109, 110, 124, 129, 133, 135, 137, 139, 141, 164,170, 232};
    byte[][] cells;
    int rule = 0;

    public WolframCA() {
        Dimension dim = new Dimension(900, 450);
        setPreferredSize(dim);
        setBackground(Color.white);
        setFont(new Font("SansSerif", Font.BOLD, 28));

        cells = new byte[dim.height][dim.width];
        cells[0][dim.width / 2] = 1;

        new Timer(5000, (ActionEvent e) -> {
            rule++;
            if (rule == ruleSet.length)
                rule = 0;
            repaint();
        }).start();
    }

    private byte rules(int lhs, int mid, int rhs) {
        int idx = (lhs << 2 | mid << 1 | rhs);
        return (byte) (ruleSet[rule] >> idx & 1);
    }

    void drawCa(Graphics2D g) {
        g.setColor(Color.black);
        for (int r = 0; r < cells.length - 1; r++) {
            for (int c = 1; c < cells[r].length - 1; c++) {
                byte lhs = cells[r][c - 1];
                byte mid = cells[r][c];
                byte rhs = cells[r][c + 1];
                cells[r + 1][c] = rules(lhs, mid, rhs);