【p5.js】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。

let maze1;

function setup() {
  maze1 = new Maze(15, 15);
  maze1.set_maze_boutaoshi();
  maze1.print_maze();
}

class Maze {
  constructor(width, height, seed=0) {
    this.PATH = 0;
    this.WALL = 1;
    this.width = width;
    this.height = height;
    if (this.width < 5 || this.height < 5) {
      return;
    }
    if (this.width%2 == 0) {
      this.width++;
    }
    if (this.height%2 == 0) {
      this.height++;
    }
    this.maze = Array.from(new Array(this.height), () => new Array(this.width).fill(this.PATH));
    randomSeed(seed);
  }

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

  print_maze() {
    for (let col of this.maze) {
      let arr = '';
      for(let cell of col) {
        if (cell == this.WALL) {
          arr += '#';
        } else if (cell == this.PATH) {
          arr += ' ';
        }
      }
      console.log(arr);
    }
  }
}

今回は、以下のように出力される。

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