Bagaimanakah saya boleh mencipta 'maze tingkap' menggunakan Ray Casting di Java yang membenarkan saiz ketinggian yang berbeza untuk dinding?

import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.List;
import javax.swing.*;

public class RayCastingWithDifferentHeightSize extends JPanel implements MouseListener, MouseMotionListener, MouseWheelListener {

    private static final int SCREEN_WIDTH = 800;
    private static final int SCREEN_HEIGHT = 600;

    private BufferedImage screen;
    private int[][] map;
    private List<Wall> walls;
    private Player player;

    private double fov = 90 * Math.PI / 180;
    private double viewDistance = 300;
    private double mouseAngle;
    private boolean[] keys;

    public RayCastingWithDifferentHeightSize() {
        setPreferredSize(new Dimension(SCREEN_WIDTH, SCREEN_HEIGHT));

        screen = new BufferedImage(SCREEN_WIDTH, SCREEN_HEIGHT, BufferedImage.TYPE_INT_RGB);

        map = new int[][]{
            {1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 3, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
            {1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}
        };

        walls = new ArrayList<>();
        for (int i = 0; i < map.length; i++) {
            for (int j = 0; j < map[i].length; j++) {
                if (map[i][j] == 1) {
                    walls.add(new Wall(i * 50, j * 50, 50, 50)); // 50 is the wall size
                }
            }
        }

        player = new Player(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2, 0);

        keys = new boolean[10];

        addMouseListener(this);
        addMouseMotionListener(this);
        addMouseWheelListener(this);
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        Graphics2D g2 = (Graphics2D) g;

        // Clear the screen
        g2.setColor(Color.BLACK);
        g2.fillRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);

        // Draw the walls
        for (Wall wall : walls) {
            g2.setColor(Color.WHITE);
            g2.fillRect(wall.getX(), wall.getY(), wall.getWidth(), wall.getHeight());

            // Draw the different heights on the walls
            int height = wall.getHeight();
            for (int i = 0; i < height; i++) {
                if (height - i < 15) {
                    g2.setColor(Color.RED);
                } else if (height - i < 30) {
                    g2.setColor(Color.YELLOW);
                } else {