在java中用递归实现L系统的龙曲线

import java.awt.*;
import javax.swing.*;

public class DragonCurve extends JFrame {
    private static final int WIDTH = 800;
    private static final int HEIGHT = 600;
    private static final int MAX_DEPTH = 15;

    public DragonCurve() {
        super("Dragon Curve");
        setSize(WIDTH, HEIGHT);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        drawDragonCurve(g, MAX_DEPTH, 100, 300, 700, 300);
    }

    private void drawDragonCurve(Graphics g, int depth, int x1, int y1, int x2, int y2) {
        if (depth == 0) {
            g.drawLine(x1, y1, x2, y2);
        } else {
            int dx = (x2 - x1) / 2;
            int dy = (y2 - y1) / 2;

            int x3 = x1 + dx - dy;
            int y3 = y1 + dy + dx;

            drawDragonCurve(g, depth - 1, x1, y1, x3, y3);
            drawDragonCurve(g, depth - 1, x3, y3, x2, y2);
        }
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            DragonCurve dragonCurve = new DragonCurve();
            dragonCurve.setVisible(true);
        });
    }
}