【Three.js】迷路を生成する

CubeとPlaneを用いて、迷路を生成する。

let maze1;

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

function setup() {  
  createCanvas(0, 0);
}

window.addEventListener('load', init);

function init() {
  const width = 640;
  const height = 480;

  const renderer = new THREE.WebGLRenderer({
    canvas: document.querySelector('#myCanvas')
  });
  renderer.setPixelRatio(window.devicePixelRatio);
  renderer.setSize(width, height);

  const scene = new THREE.Scene();

  const camera = new THREE.PerspectiveCamera(60, width / height);
  camera.position.set(45, 45, 45);
  camera.lookAt(new THREE.Vector3(0, 0, 0));

  const geometry = new THREE.BoxGeometry(1, 1, 1);
  const material = new THREE.MeshNormalMaterial();
  for (let y=0; y<15; ++y) {
    for (let x=0; x<15; ++x) {
      if (maze1.maze[y][x] == 1) {
        const box = new THREE.Mesh(geometry, material);
        box.position.set(x+0.5, 0.5, y+0.5);
        scene.add(box);
      }
    }
  }
  
  const plane = new THREE.Mesh(                                      
             new THREE.PlaneGeometry(15, 15, 1, 1),
              new THREE.MeshBasicMaterial({ 
                color: 0xffffff             
                }));
  plane.position.set(7.5, 0, 7.5);
  plane.rotation.x = -0.5 * Math.PI;
  scene.add(plane); 
  
  const axes = new THREE.AxesHelper(35);
  scene.add(axes);

  renderer.render(scene, camera);
}

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));
    this.dist = Array.from(new Array(this.height), () => new Array(this.width).fill(-1));
    this.start = [1, 1];
    this.goal = [this.width-2, this.height-2];
    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;
  }
  
  set_start_goal(start, goal) {
    if (this.maze[start[1]][start[0]] == this.PATH) {
      this.start = start;
    }
    if (this.maze[goal[1]][goal[0]] == this.PATH) {
      this.goal = goal;
    }
    return this.maze;
  }
  
  set_dist_bfs(flag=false) {
    let queue = [];
    this.dist[this.start[1]][this.start[0]] = 0;
    queue.push(this.start);
    while (queue.length > 0) {
      let point = queue.shift();
      for (let x of [[0,-1],[1,0],[0,1],[-1,0]]) {
        if (this.maze[point[1]+x[1]][point[0]+x[0]] == 0 && this.dist[point[1]+x[1]][point[0]+x[0]] == -1) {
          this.dist[point[1]+x[1]][point[0]+x[0]] = this.dist[point[1]][point[0]] + 1;
          queue.push([point[0]+x[0],point[1]+x[1]]);
        }
        if (flag != true) {
          if (point[0]+x[0] == this.goal[0] && point[1]+x[1] == this.goal[1]) {
            queue = [];
            break;
          }
        }
      }
    }
    return this.dist;
  }
  
  set_dist_dfs(flag=false) {
    let stack = [];
    this.dist[this.start[1]][this.start[0]] = 0;
    stack.push(this.start);
    while (stack.length > 0) {
      let point = stack.pop();
      for (let x of [[0,-1],[1,0],[0,1],[-1,0]]) {
        if (this.maze[point[1]+x[1]][point[0]+x[0]] == 0 && this.dist[point[1]+x[1]][point[0]+x[0]] == -1) {
          this.dist[point[1]+x[1]][point[0]+x[0]] = this.dist[point[1]][point[0]] + 1;
          stack.push([point[0]+x[0],point[1]+x[1]]);
        }
        if (flag != true) {
          if (point[0]+x[0] == this.goal[0] && point[1]+x[1] == this.goal[1]) {
            stack = [];
            break;
          }
        }
      }
    }
    return this.dist;
  }

  set_shortest_path() {
    let point = this.goal;
    let x = [[0,-1],[1,0],[0,1],[-1,0]];
    this.maze[point[1]][point[0]] = '*';
    while (this.dist[point[1]][point[0]] > 0) {
      for (let i = 0; i < x.length; ++i) {
        if (this.dist[point[1]][point[0]]-this.dist[point[1]+x[i][1]][point[0]+x[i][0]] == 1) {
          if (this.dist[point[1]][point[0]] > 0) {
            this.maze[point[1]+x[i][1]][point[0]+x[i][0]] = '*';
            point = [point[0]+x[i][0],point[1]+x[i][1]];
          }
        }
      }
    }
    return this.maze;
  }

  print_maze() {
    this.maze[this.start[1]][this.start[0]] = 'S';
    this.maze[this.goal[1]][this.goal[0]] = 'G';
    for (let col of this.maze) {
      let arr = '';
      for(let cell of col) {
        if (cell == this.WALL) {
          arr += '#';
        } else if (cell == this.PATH) {
          arr += ' ';
        } else if (cell == 'S') {
          arr += 'S';
        } else if (cell == 'G') {
          arr += 'G';
        } else if (cell == '*') {
          arr += '*';
        }
      }
      console.log(arr);
    }
  }
  
  print_dist() {
    for (let col of this.dist) {
      let arr = '';
      for (let cell of col) {
        if (cell == -1) {
          if (Math.max.apply(null, Array.prototype.concat.apply([], this.dist)) == -1) {
            arr += '#';
          } else {
            for (let i = 0; i < str(Math.max.apply(null, Array.prototype.concat.apply([], this.dist))).length; ++i) {
              arr += '#';
            }
          }
        } else {
          if (str(cell).length == str(Math.max.apply(null, Array.prototype.concat.apply([], this.dist))).length) {
            arr += str(cell);
          } else {
            for (let i = 0; i < str(Math.max.apply(null, Array.prototype.concat.apply([], this.dist))).length-str(cell).length; ++i) {
              arr += ' ';
            }
            arr += str(cell);
          }
        }
      }
      console.log(arr);
    }
  }
}

今回は、以下のように出力される。

p5.js Web Editor
A web editor for p5.js, a JavaScript library with the goal of making coding accessible to artists, designers, educators, and beginners.

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