【C#】棒倒し法で迷路を生成する

迷路の幅と高さをそれぞれ width, height として設定し、
その数値にしたがって棒倒し法で迷路を生成する。
※迷路の幅と高さは5以上の奇数とする。

using System;

public class Maze {
    public const int PATH = 0;
    public const int WALL = 1;
    public int width;
    public int height;
    public int[,] maze;
    private Random random;
    
    public Maze(int width, int height, int seed = 0) {
        this.width = width;
        this.height = height;
        if (this.width < 5 || this.height < 5) {
            Environment.Exit(0);
        }
        if (this.width % 2 == 0) {
            this.width++;
        }
        if (this.height % 2 == 0) {
            this.height++;
        }
        this.maze = new int[this.height,this.width];
        for (int y = 0; y < this.height; ++y) {
            for (int x = 0; x < this.width; ++x) {
                this.maze[y,x] = Maze.PATH;
            }
        }
        this.random = new Random(seed);
    }

    public int[,] set_outer_wall() {
        for (int y = 0; y < this.height; ++y) {
            for (int x = 0; x < this.width; ++x) {
                if (x == 0 || y == 0 || x == this.width-1 || y == this.height-1) {
                    this.maze[y,x] = Maze.WALL;
                }
            }
        }
        return this.maze;
    }
    
    public int[,] set_inner_wall() {
        for (int y = 2; y < this.height-1; y += 2) {
            for (int x = 2; x < this.width-1; x += 2) {
                this.maze[y,x] = Maze.WALL;
            }
        }
        return this.maze;
    }
    
    public int[,] set_maze_boutaoshi() {
        int wall_x;
        int wall_y;
        int direction;
        this.set_outer_wall();
        this.set_inner_wall();
        for (int y = 2; y < this.height-1; y += 2) {
            for (int x = 2; x < this.width-1; x += 2) {
                while (true) {
                    wall_x = x;
                    wall_y = y;
                    if (y == 2) {
                        direction = random.Next(0,4);
                    } else {
                        direction = random.Next(0,3);
                    }
                    switch (direction) {
                        case 0:
                            wall_x += 1;
                            break;
                        case 1:
                            wall_y +=1;
                            break;
                        case 2:
                            wall_x -=1;
                            break;
                        case 3:
                            wall_y -=1;
                            break;
                    }
                    if (this.maze[wall_y,wall_x] != Maze.WALL) {
                        this.maze[wall_y,wall_x] = Maze.WALL;
                        break;
                    }
                }
            }
        }
        return this.maze;
    }

    public void print_maze() {
        for (int y = 0; y < this.maze.GetLength(0); ++y) {
            for (int x = 0; x < this.maze.GetLength(1); ++x) {
                if (this.maze[y,x] == Maze.WALL) {
                    Console.Write('#');
                } else if (this.maze[y,x] == Maze.PATH) {
                    Console.Write(' ');
                }
            }
            Console.WriteLine();
        }
    }

    public static void Main() {
        Maze maze1 = new Maze(15, 15);
        maze1.set_maze_boutaoshi();
        maze1.print_maze();
    }
}

今回は、以下のように出力される。

###############
#   # #     # #
### # ### ### #
#             #
# ### ##### # #
# #       # # #
# ### ####### #
# #         # #
##### # ##### #
#     #     # #
# ##### ### # #
#   #     # # #
### ### ##### #
#   #       # #
###############