ゲームライブラリ構築までの道「インベーダー編」#11 : 敵機の攻撃処理

Posted on 2020/07/30 by 下駄

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Check

こんにちわ。

我が強い人とはあまり話をしたくない、下駄です。

ほぼ在宅作業のフリーランスエンジニアのメリットは何と言っても、無駄に他人と関わることがないことでしょう。

サラリーマン時代に、コミュニケーションを重要視して、無駄に人との会話をぞんざいにできなくて、感じていた時間の無駄がほぼ無くなるのは、IT関連でテレワークができるようになった人やフリーランスの人にとっては、人生で大きく得をした点でもあるでしょう。

そして、人との関わりで、ITが重要視されはじめた今の時代は、こうした働き方ができる業種が伸びてくるし、当たり前になってくるでしょう。

何より、IT業界の需要はこれまでにもまして増えてくる反面、エンジニア不足と言われ始めるでしょう。

さて、本日は、見た目的にもかなり終盤に近づいているように見えるインベーダーゲームですが、ようやく折り返し地点ぐらいですかね。

毎日楽しみながら進行しているので、亀足ですがお付き合いくださいませ。

本日のIT謎掛け

「デジタル・コミュニケーション」と、かけまして、

「料亭で行う重要な会議」と、ときます。

そのココロは・・・

重要な事を、かいせきします。
解析と会席

ソースコード

(function(w,d){

  var __options = {
    canvas_size : { x : null , y : null },
    bitmap_size : { w : 48 , h : 48},

    cannon : {
      color : "#57F2D6",
      bitSize : 4,
      src   : "images/dot/cannon.dot",
      x : 0 , y : 0,
      moveX : 10
    },
    cannon_shoot : {
      w : 1,
      h : 3
    },
    ufo : {
      color : "white",
      src   : "images/dot/ufo.dot",
      x : 0 , y : 0,
      moveX : 10
    },
    
    invader_effect_1 : {
      color : "white",
      src   : "images/dot/invader_effect_1.dot",
      x : 0 , y : 0,
    },

    tochika : {
      color : "red",
      src   : "images/dot/tochika.dot",
      w     : 72,
      rate  : 2.5
    },
    
    invader_src : {
      "crab" : [
        'images/dot/crab_1.dot',
        "images/dot/crab_2.dot"
      ],
      "octpus" : [
        "images/dot/octpus_1.dot",
        "images/dot/octpus_2.dot"
      ],
      "squid" : [
        "images/dot/squid_1.dot",
        "images/dot/squid_2.dot"
      ]
    },
    invader_row_infos : [
      { invader : "squid" , color : "#68F205"},
      { invader : "crab"  , color : "#68F205"},
      { invader : "crab"  , color : "#57F2D6"},
      { invader : "octpus", color : "#57F2D6"},
      { invader : "octpus", color : "#F22786"}
    ],
    invader_config : {
      type   : "invader",
      margin : 10, // display-margin
      move_x : 4, // [1:right , -1:left]
      move_y : 4
    },
    bullet : {
      color : "white",
      x : 0 , y : 0,
      moveY : 4
    },
    bullet_anim : [
      "images/dot/bullet_1.dot",
      "images/dot/bullet_2.dot"
    ]
  };

  var MAIN = function(canvas_selector){
    this.canvas_selector = canvas_selector || "canvas";
    this.shoots = [];
    this.pattern = 0;

    this.setCanvas(this.canvas_selector);
    this.set_imageMax();
    this.event_set();
    this.bitmap_load();
    this.view();
    this.animation_roop();
  };

  MAIN.prototype.setCanvas = function(selector){
    this.canvas_elm = d.querySelector(selector);
    if(!this.canvas_elm){return;}
    this.canvas_elm.style.setProperty("background-color","black","");
    
    if(w.innerWidth < this.canvas_elm.offsetWidth){
      this.canvas_elm.setAttribute("width" , w.innerWidth);
    }
    if(w.innerHeight < this.canvas_elm.offsetHeight){
      this.canvas_elm.setAttribute("height" , w.innerHeight);
    }

    __options.canvas_size.x = this.canvas_elm.offsetWidth;
    __options.canvas_size.y = this.canvas_elm.offsetHeight;
    __options.cannon.y      = __options.canvas_size.y - 100;

    // smooth-off
    this.ctx = this.canvas_elm.getContext("2d");
    this.ctx.imageSmoothingEnabled       = false;
    this.ctx.mozImageSmoothingEnabled    = false;
    this.ctx.webkitImageSmoothingEnabled = false;
    this.ctx.msImageSmoothingEnabled     = false;
  };

  

  MAIN.prototype.clear = function(){
    this.ctx.clearRect(0, 0,  this.canvas_elm.width,  this.canvas_elm.height);
  };

  MAIN.prototype.bitmap_load = function(){
    var bitmap_files = [];
    for(var i in __options.invader_src){
      for(var j=0; j<__options.invader_src[i].length; j++){
        bitmap_files.push(__options.invader_src[i][j]);
      }
    }
    for(var i=0; i<bitmap_files.length; i++){
      this.image_bit_set(bitmap_files[i]);
    }
    for(var i=0; i<__options.bullet_anim.length; i++){
      this.image_bit_set(__options.bullet_anim[i]);
    }
    this.image_bit_set(__options.cannon.src);
    this.image_bit_set(__options.ufo.src);
    this.image_bit_set(__options.invader_effect_1.src);
    this.image_bit_set(__options.tochika.src , __options.tochika.w);
  };

  MAIN.prototype.view = function(){
    // invader
    this.view_invader();

    // canon
    this.image(__options.cannon);

    // tochika
    this.view_tochika();
  }

  MAIN.prototype.view_invader = function(){
    if(typeof __options.invaders === "undefined"){
      this.init_invaders_info();
    }
    for(var i in __options.invaders){
      for(var j in __options.invaders[i]){
        if(typeof __options.invaders[i][j][0].shoot_flg !== "undefined"){
          if(__options.invaders[i][j][0].shoot_flg <= 2){
            __options.invaders[i][j][0].shoot_flg++;
          }
          else{
            __options.invaders[i].splice(j,1);
            continue;
          }
        }
        this.image(__options.invaders[i][j][this.pattern]);
      }
    }
  };

  MAIN.prototype.view_tochika = function(){
    if(typeof this.image_cache[__options.tochika.src] === "undefined"
    || typeof this.image_cache[__options.tochika.src].bitmap === "undefined"
    || !this.image_cache[__options.tochika.src].bitmap.length){return;}
    if(typeof __options.tochikas === "undefined"){
      this.init_tochilas_info();
    }
    // 配置間隔
    var rate = __options.tochika.rate;
    // 配置計算
    var tochika_count = Math.floor(this.canvas_elm.offsetWidth / (__options.tochika.w * rate));
    var margin = (this.canvas_elm.offsetWidth - ((__options.tochika.w * rate) * tochika_count)) / 2;
    var centering = __options.tochika.w * (rate - 1) /2;
    var y = this.canvas_elm.offsetHeight - 170;
    for(var i in __options.tochikas){
      __options.tochikas[i].x = margin + ((__options.tochika.w * rate) * i) + centering;
      __options.tochikas[i].y = y;
      __options.tochikas[i].bitsize = __options.tochikas[i].bitsize || this.image_cache[__options.tochika.src].bitsize;
      __options.tochikas[i].h = __options.tochikas[i].bitsize * __options.tochikas[i].bitmap.length;
      this.image(__options.tochikas[i]);
    }
  };

  MAIN.prototype.init_invaders_info = function(){
    // 配置マージン
    margin = __options.invader_config.margin;
    // 配置個数（w）
    var count_w = Math.floor((__options.canvas_size.x - margin * 2) / __options.bitmap_size.w) -2;

    // 敵機配置情報作成
    __options.invaders = [];
    for(var i=0; i<__options.invader_row_infos.length; i++){
      var type = __options.invader_row_infos[i].invader;
      __options.invaders[i] = [];
      var srcs = __options.invader_src[type];
      for(var j=0; j<count_w; j++){
        __options.invaders[i][j] = [];
        for(var k=0; k<srcs.length; k++){
          __options.invaders[i][j][k] = {
            color : __options.invader_row_infos[i].color,
            x     : (j * __options.bitmap_size.w) + margin,
            y     : (i * __options.bitmap_size.h) + margin,
            type  : type,
            src   : srcs[k]
          };
        }
      }
    }
  };
  MAIN.prototype.init_tochilas_info = function(){
    __options.tochikas = [];
    var rate = __options.tochika.rate;
    var tochika_count = Math.floor(this.canvas_elm.offsetWidth / (__options.tochika.w * rate));
    var bitmap = this.image_cache[__options.tochika.src].bitmap;
    for(var i=0; i<tochika_count; i++){
      __options.tochikas.push({
        src     : __options.tochika.src,
        color   : __options.tochika.color,
        bitmap  : JSON.parse(JSON.stringify(bitmap))
      });
    }
  };

  MAIN.prototype.image_cache = [];
  MAIN.prototype.image = function(options){
    if(!this.canvas_elm){return;}
    if(!options){return;}
    if(typeof this.image_cache[options.src] === "undefined"){return}
    var bitmap  = this.get_bitmap(options);
    var bitsize = this.get_bitsize(options);
    this.image_bit_make(bitmap , bitsize , options.color , options.x , options.y);
  };

  MAIN.prototype.get_bitmap = function(option){
    if(typeof option.bitmap !== "undefined"){
      return option.bitmap;
    }
    else if(typeof this.image_cache[option.src] !== "undefined"
    && typeof this.image_cache[option.src].bitmap !== "undefined"){
      return this.image_cache[option.src].bitmap;
    }
  };
  MAIN.prototype.get_bitsize = function(option){
    if(typeof this.image_cache[option.src] !== "undefined"
    || typeof this.image_cache[option.src].bitsize !== "undefined"){
      return this.image_cache[option.src].bitsize;
    }
  };

  MAIN.prototype.image_bit_set = function(src , bitmap_size){
    if(typeof this.image_cache[src] !== "undefined"){return;}
    bitmap_size = bitmap_size || __options.bitmap_size.w;
    this.image_cache[src] = {
      bitsize : 0,
      bitmap  : []
    };
    new AJAX({
      url       : src,
      methdo    : "GET",
      async     : true,
      onSuccess : (function(src , bitmap_size , data){
        this.image_bit_loaded(src , bitmap_size , data);
      }).bind(this , src , bitmap_size)
    });
  };
  MAIN.prototype.image_bit_loaded = function(src , bitmap_size , data){
    var char16    = data.split("\n");
    var str_count = char16[0].length * 4;
    var size      = bitmap_size / str_count;
    // ゼロパディング用桁数算出
    var zero = new Array(str_count).fill("0").join("")
    for(var i in char16){
      // 16進数を２進数に変換
      var char2 = parseInt(char16[i] , 16).toString(2);
      // サイズ取得
      this.image_cache[src].bitsize = size;
      char2 = (zero + char2).slice(-str_count);
      this.image_cache[src].bitmap.push(char2);
    }
  };
  MAIN.prototype.image_bit_make = function(bitmap , bitsize , color , x , y){
    if(!bitmap){return;}
    color = color || "white";
    this.ctx.fillStyle = color;
    for(var i=0; i<bitmap.length; i++){
      for(var j=0; j<bitmap[i].length; j++){
        var bit = bitmap[i].charAt(j);
        if(bit == 0){continue;}
        var w = bitsize;
        var h = bitsize;
        this.ctx.fillRect(x+(j * w) , y+(i * h) , Math.ceil(w) , Math.ceil(h));
      }
    }
  };

  MAIN.prototype.animation_roop = function(time){
    var func = (function(e){this.animation(e)}).bind(this);

    this.animation_proc();

    if(window.requestAnimationFrame
    ||  window.webkitRequestAnimationFrame
    ||  window.mozRequestAnimationFrame
    ||  window.oRequestAnimationFrame
    ||  window.msRequestAnimationFrame){
      window.requestAnimationFrame(func);
    }
    else{
      time = time || 10;
      anim_flg = setTimeout(func , time);
    }
  };

  MAIN.prototype.animation_proc = function(){
    switch(this.keydown_flg){
      case "right":
        this.cannon_move(__options.cannon.x + __options.cannon.moveX);
        break;
      case "left":
        this.cannon_move(__options.cannon.x - __options.cannon.moveX);
        break;
    }
    this.animation_shoot();
  };

  MAIN.prototype.animation_shoot = function(){
    if(!this.shoots.length){return;}
    var bitsize = this.image_cache[__options.cannon.src].bitsize;
    var w = bitsize * __options.cannon_shoot.w;
    var h = bitsize * __options.cannon_shoot.h;
    for(var i in this.shoots){
      
      // collision
      if(this.shoot_collision_tochika(this.shoots[i].x , this.shoots[i].y , w , h)){
        this.shoots.splice(i,1);
      }
      else if(this.shoot_collision_invader(this.shoots[i].x , this.shoots[i].y , w , h)){
        this.shoots.splice(i,1);
      }
      else if(this.shoots[i].y < h){
        this.shoots.splice(i,1);
      }
      else{
        this.ctx.fillStyle   = "white";
        this.ctx.fillRect(this.shoots[i].x - bitsize , this.shoots[i].y , w , h);
        this.shoots[i].y -= bitsize * 2;
      }
    }
  };

  MAIN.prototype.animation_bullet = function(){
    if(typeof this.bullets === "undefined" || !this.bullets.length){return;}
    var current_time = (+new Date());

    // アニメーションパターンのフレーム感覚
    if(typeof this.bullet_anim_time === "undefined"){
      this.bullet_anim_time = current_time;
    }

    // アニメーションパターンの切り替え
    if(typeof this.bullet_anim_num === "undefined"){
      this.bullet_anim_num = 0;
    }
    else if(current_time - this.bullet_anim_time > 50){
      this.bullet_anim_time = current_time;
      this.bullet_anim_num++;
      if(this.bullet_anim_num >= __options.bullet_anim.length){
        this.bullet_anim_num = 0;
      }
    }

    var bitsize = this.image_cache[__options.bullet_anim[this.bullet_anim_num]].bitsize;
    for(var i in this.bullets){
      this.bullets[i].y += bitsize;
      var y = this.bullets[i].y;

      if(y > this.canvas_elm.offsetHeight){
        this.bullets[i] = null;
      }
      else{
        var option = {
          x : this.bullets[i].x,
          y : y = y,
          src : __options.bullet_anim[this.bullet_anim_num],
          color : __options.bullet.color
        };
        this.image(option);
      }
    }
    var newArr = [];
    for(var i in this.bullets){
      if(!this.bullets[i]){continue;}
      newArr.push(this.bullets[i]);
    }
    this.bullets = newArr;
  };

  MAIN.prototype.shoot_collision_invader = function(x , y , w , h){
    var inv = __options.invaders;
    for(var i in inv){
      for(var j in inv[i]){
        var ix = inv[i][j][0].x;
        var iy = inv[i][j][0].y;
        var iw = __options.bitmap_size.w;
        var ih = __options.bitmap_size.h;
        if(ix <= x && x <= ix + iw
        && iy <= y - h && y <= iy + ih){
          for(var k=0; k<inv[i][j].length; k++){
            inv[i][j][k].src = __options.invader_effect_1.src;
            inv[i][j][k].shoot_flg = 1;
          }
          return true;
        }
      }
    }
  };

  MAIN.prototype.shoot_collision_tochika = function(x , y , w , h){
    for(var i in __options.tochikas){
      var tx = __options.tochikas[i].x;
      var ty = __options.tochikas[i].y;
      var tw = __options.tochika.w;
      var th = __options.tochikas[i].h;
      if(tx <= x && x <= tx + tw
      && ty <= y + h && y <= ty + th){
        return this.tochika_scrape_shoot(__options.tochikas[i] , x , y);
      }
    }
  };

  MAIN.prototype.tochika_scrape_shoot = function(tochika_data , shoot_x , shoot_y){
    // 衝突したtochikaの下部分を検出
    var x = shoot_x - tochika_data.x;
    var y = shoot_y - tochika_data.y;
    var dot_x = Math.round(x / tochika_data.bitsize);
    var dot_y = Math.round(y / tochika_data.bitsize);

    if(typeof tochika_data.bitmap[dot_y] === "undefined"){
      dot_y = dot_y < 0 ? 0 : tochika_data.bitmap.length-1;
    }
    if(typeof tochika_data.bitmap[dot_y][dot_x] === "undefined"){
      dot_x = dot_x < 0 ? 0 : tochika_data.bitmap[dot_y].length -1;
    }

    // 当たった座標のドット部分を選択 衝突箇所以下を削除
    for(var i=tochika_data.bitmap.length-1; i>=0; i--){
      if(tochika_data.bitmap[i][dot_x] != 1){continue;}
      var str = tochika_data.bitmap[i];
      tochika_data.bitmap[i] = str.slice(0,dot_x).concat("0",str.slice(dot_x+1));
      return true;
    }
    return false;
  };

  MAIN.prototype.cannon_move = function(pos){
    if(pos < 0){
      pos = 0;
    }
    else if(pos > this.canvas_elm.offsetWidth - __options.bitmap_size.w){
      pos = this.canvas_elm.offsetWidth - __options.bitmap_size.w;
    }
    __options.cannon.x = pos;
  };

  MAIN.prototype.animation = function(){
    this.clear();
    this.nextPattern(300);
    this.view();
    this.animation_roop(30);
    this.invader_bullet();
  }
  MAIN.prototype.nextPattern = function(frame_rate){
    this.prev_time = this.prev_time || 0;
    if((+new Date()) - this.prev_time < frame_rate){return}
    this.prev_time = (+new Date());

    this.pattern++;
    if(this.pattern >= this.image_max){
      this.pattern = 0;
    }

    this.invader_move();
  };

  MAIN.prototype.invader_move = function(){
    // 左端の情報取得
    var window_min = __options.invader_config.margin;
    var window_max = this.canvas_elm.offsetWidth - __options.invader_config.margin;
    var pos        = this.invader_pos();
    var move_x     = __options.invader_config.move_x;
    var move_y     = 0;
    var w          = __options.bitmap_size.w;

    // move y
    if(typeof this.move_y_count !== "undefined" && this.move_y_count > 0){
      this.move_y_count -= 1;
      move_y = __options.invader_config.move_y;
      move_x = 0;
    }
    // Dead end ->
    else if(move_x > 0 && pos.max > window_max){
      this.move_y_count = 1;
      __options.invader_config.move_x = -__options.invader_config.move_x;
      move_x = 0;
      move_y = __options.invader_config.move_y;
    }
    // <- Dead end
    else if(move_x < 0 && pos.min < window_min){
      this.move_y_count = 1;
      __options.invader_config.move_x = -__options.invader_config.move_x;
      move_x = 0;
      move_y = __options.invader_config.move_y;
    }
    this.invader_move_set(move_x , move_y);
  };

  // mode @ [min : 一番左端のinvaderの座標を取得 . max : 一番右端のinvaderの座標を取得]
  MAIN.prototype.invader_pos = function(mode){
    var min = null;
    var max = null;
    var inv = __options.invaders;
    var w   = __options.bitmap_size.w;
    for(var i in inv){
      for(var j in inv[i]){
        if(min === null || min > inv[i][j][0].x){
          min = inv[i][j][0].x;
        }
        if(max === null || max < inv[i][j][0].x + w){
          max = inv[i][j][0].x + w;
        }
      }
    }
    if(mode === "min"){
      return min;
    }
    else if(mode === "max"){
      return max;
    }
    else{
      return {min : min , max : max};
    }
  };

  MAIN.prototype.invader_move_set = function(x,y){
    var inv = __options.invaders;
    for(var i in inv){
      for(var j in inv[i]){
        for(var k in inv[i][j]){
          inv[i][j][k].x += x;
          inv[i][j][k].y += y;
        }
      }
    }
  };

  // 各列の一番下のインベーダーがミサイルを発射する（最大同時数:2）
  MAIN.prototype.invader_bullet = function(){
    if(typeof this.bullets === "undefined"){
      this.bullets = [];
    }
    this.invader_bullet_add();
    this.animation_bullet();
  };
  MAIN.prototype.invader_bullet_add = function(){
    if(this.bullets.length >= __options.bullet_anim.length){return;}
    if(Math.floor(Math.random() * Math.floor(100)) > 10){return;}
    var bottoms = this.get_invader_bottoms();
    var keys    = Object.keys(bottoms);
    if(!bottoms || !keys.length){return;}
    var rnd_num = Math.floor(Math.random() * Math.floor(keys.length));
    var data = {
      x : bottoms[keys[rnd_num]].x,
      y : bottoms[keys[rnd_num]].y + __options.bitmap_size.h
    };
    this.bullets.push(data);
  };

  // 各列の最下部インベーダー一覧の取得
  MAIN.prototype.get_invader_bottoms = function(){
    var inv = __options.invaders;
    var bottoms = {};
    for(var i=inv.length-1; i>=0; i--){
      for(var j in inv[i]){
        if(!inv[i][j]){continue;}
        var x = inv[i][j][0].x;
        if(typeof bottoms[x] !== "undefined"){continue;}
        bottoms[x] = inv[i][j][0];
      }
    }
    return bottoms;
  };


  MAIN.prototype.set_imageMax = function(){
    for(var i in __options.invader_src){
      this.image_max = __options.invader_src[i].length;
      break;
    }
  };

  /* Event */
  MAIN.prototype.event_set = function(){
    new LIB().event(w , "click"      , (function(e){this.click(e)}).bind(this));
    new LIB().event(w , "keydown"    , (function(e){this.keydown(e)}).bind(this));
    new LIB().event(w , "keyup"      , (function(e){this.keyup(e)}).bind(this));
    new LIB().event(w , "mousemove"  , (function(e){this.mousemove(e)}).bind(this));
    new LIB().event(w , "touchmove"  , (function(e){this.touchmove(e)}).bind(this));
    new LIB().event(w , "touchend"   , (function(e){this.touchend(e)}).bind(this));
  };

  MAIN.prototype.click = function(e){
    this.shoot_add();
  };

  MAIN.prototype.shoot_add = function(){
    if(this.shoots.length < 2){
      this.shoots.push({
        x : __options.cannon.x + (__options.bitmap_size.w / 2),
        y : __options.cannon.y + (__options.cannon.bitSize * 4)
      });
    }
  };

  MAIN.prototype.keydown = function(e){
    switch(e.keyCode){
      case 37:  // <-
      case 'ArrowLeft':
      this.keydown_flg = "left";
      break;

      case 39:  // ->
      case 'ArrowRight':
      this.keydown_flg = "right";
      break;

      case 32:  // space
      this.shoot_add();
      break;
    }
  };

  MAIN.prototype.keyup = function(e){
    this.keydown_flg = false;
  };

  MAIN.prototype.mousemove = function(e){
    // if(this.flg_gamestart !== true){return;}

    this.mousePos = this.mousePos || e.clientX;
    this.cannon_move(__options.cannon.x + (e.clientX - this.mousePos));
    this.mousePos = e.clientX;
  };

  MAIN.prototype.touchmove = function(e){
    // if(this.flg_gamestart !== true){return;}

    if(!e || !e.touches || e.touches.length > 1){
      this.mousePos = null;
      return;
    }
    this.mousePos = typeof this.mousePos === "number" ? this.mousePos : e.touches[0].clientX;
    this.cannon_move(__options.cannon.x + (e.touches[0].clientX - this.mousePos));
    this.mousePos = e.touches[0].clientX;
  };
  MAIN.prototype.touchend = function(e){
    this.mousePos = null;
  };





  var LIB  = function(){};

  LIB.prototype.event = function(target, mode, func , flg){
    flg = (flg) ? flg : false;
    if (target.addEventListener){target.addEventListener(mode, func, flg)}
    else{target.attachEvent('on' + mode, function(){func.call(target , window.event)})}
  };

  var AJAX = function(option){
    if(!option){return}
		var httpoj = this.createHttpRequest();
    if(!httpoj){return;}
    
		// var option = new MAIN().setOption(options);
		var data   = this.setQuery(option);
		if(!data.length){
			option.method = "get";
		}

		httpoj.open( option.method , option.url , option.async );
    httpoj.setRequestHeader('Content-Type', option.type);
		
		httpoj.onreadystatechange = function(){
			if (this.readyState==4 && httpoj.status == 200){
				option.onSuccess(this.responseText);
			}
		};

		// FormData 送信用
		if(typeof option.form === "object" && Object.keys(option.form).length){
			httpoj.send(option.form);
		}
		// query整形後 送信
		else{
			if(data.length){
				httpoj.send(data.join("&"));
			}
			else{
				httpoj.send();
			}
		}
  };
	AJAX.prototype.dataOption = {
		url:"",
		query:{},
		querys:[],
		data:{},
		form:{},
		async:"true",
		method:"POST",
		type:"application/x-www-form-urlencoded",
		onSuccess:function(res){},
		onError:function(res){}
	};
	AJAX.prototype.createHttpRequest = function(){
		//Win ie用
		if(window.ActiveXObject){
			//MSXML2以降用;
			try{return new ActiveXObject("Msxml2.XMLHTTP")}
			catch(e){
				//旧MSXML用;
				try{return new ActiveXObject("Microsoft.XMLHTTP")}
				catch(e2){return null}
			}
		}
		//Win ie以外のXMLHttpRequestオブジェクト実装ブラウザ用;
		else if(window.XMLHttpRequest){return new XMLHttpRequest()}
		else{return null}
  };
  // URL-Queryの作成
  AJAX.prototype.setQuery = function(option){
		var data = [];
		if(typeof option.datas !== "undefined"){
			for(var key of option.datas.keys()){
				data.push(key + "=" + option.datas.get(key));
			}
		}
		if(typeof option.query !== "undefined"){
			for(var i in option.query){
				data.push(i+"="+encodeURIComponent(option.query[i]));
			}
		}
		if(typeof option.querys !== "undefined"){
			for(var i=0;i<option.querys.length;i++){
				if(typeof option.querys[i] == "Array"){
					data.push(option.querys[i][0]+"="+encodeURIComponent(option.querys[i][1]));
				}
				else{
					var sp = option.querys[i].split("=");
					data.push(sp[0]+"="+encodeURIComponent(sp[1]));
				}
			}
		}
    return data;
  }





  new LIB().event(w , "load" , function(){new MAIN("#mycanvas")});
})(window,document);

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(function(w,d){

var __options = {

canvas_size : { x : null , y : null },

bitmap_size : { w : 48 , h : 48},

cannon : {

color : "#57F2D6",

bitSize : 4,

src : "images/dot/cannon.dot",

x : 0 , y : 0,

moveX : 10

cannon_shoot : {

w : 1,

h : 3

ufo : {

color : "white",

src : "images/dot/ufo.dot",

x : 0 , y : 0,

moveX : 10

invader_effect_1 : {

color : "white",

src : "images/dot/invader_effect_1.dot",

x : 0 , y : 0,

tochika : {

color : "red",

src : "images/dot/tochika.dot",

w : 72,

rate : 2.5

invader_src : {

"crab" : [

'images/dot/crab_1.dot',

"images/dot/crab_2.dot"

"octpus" : [

"images/dot/octpus_1.dot",

"images/dot/octpus_2.dot"

"squid" : [

"images/dot/squid_1.dot",

"images/dot/squid_2.dot"

]

invader_row_infos : [

{ invader : "squid" , color : "#68F205"},

{ invader : "crab" , color : "#68F205"},

{ invader : "crab" , color : "#57F2D6"},

{ invader : "octpus", color : "#57F2D6"},

{ invader : "octpus", color : "#F22786"}

invader_config : {

type : "invader",

margin : 10, // display-margin

move_x : 4, // [1:right , -1:left]

move_y : 4

bullet : {

color : "white",

x : 0 , y : 0,

moveY : 4

bullet_anim : [

"images/dot/bullet_1.dot",

"images/dot/bullet_2.dot"

]

};

var MAIN = function(canvas_selector){

this.canvas_selector = canvas_selector || "canvas";

this.shoots = [];

this.pattern = 0;

this.setCanvas(this.canvas_selector);

this.set_imageMax();

this.event_set();

this.bitmap_load();

this.view();

this.animation_roop();

};

MAIN.prototype.setCanvas = function(selector){

this.canvas_elm = d.querySelector(selector);

if(!this.canvas_elm){return;}

this.canvas_elm.style.setProperty("background-color","black","");

if(w.innerWidth < this.canvas_elm.offsetWidth){

this.canvas_elm.setAttribute("width" , w.innerWidth);

}

if(w.innerHeight < this.canvas_elm.offsetHeight){

this.canvas_elm.setAttribute("height" , w.innerHeight);

}

__options.canvas_size.x = this.canvas_elm.offsetWidth;

__options.canvas_size.y = this.canvas_elm.offsetHeight;

__options.cannon.y = __options.canvas_size.y - 100;

// smooth-off

this.ctx = this.canvas_elm.getContext("2d");

this.ctx.imageSmoothingEnabled = false;

this.ctx.mozImageSmoothingEnabled = false;

this.ctx.webkitImageSmoothingEnabled = false;

this.ctx.msImageSmoothingEnabled = false;

};

MAIN.prototype.clear = function(){

this.ctx.clearRect(0, 0, this.canvas_elm.width, this.canvas_elm.height);

};

MAIN.prototype.bitmap_load = function(){

var bitmap_files = [];

for(var i in __options.invader_src){

for(var j=0; j<__options.invader_src[i].length; j++){

bitmap_files.push(__options.invader_src[i][j]);

}

for(var i=0; i<bitmap_files.length; i++){

this.image_bit_set(bitmap_files[i]);

}

for(var i=0; i<__options.bullet_anim.length; i++){

this.image_bit_set(__options.bullet_anim[i]);

}

this.image_bit_set(__options.cannon.src);

this.image_bit_set(__options.ufo.src);

this.image_bit_set(__options.invader_effect_1.src);

this.image_bit_set(__options.tochika.src , __options.tochika.w);

};

MAIN.prototype.view = function(){

// invader

this.view_invader();

// canon

this.image(__options.cannon);

// tochika

this.view_tochika();

}

MAIN.prototype.view_invader = function(){

if(typeof __options.invaders === "undefined"){

this.init_invaders_info();

}

for(var i in __options.invaders){

for(var j in __options.invaders[i]){

if(typeof __options.invaders[i][j][0].shoot_flg !== "undefined"){

if(__options.invaders[i][j][0].shoot_flg <= 2){

__options.invaders[i][j][0].shoot_flg++;

}

else{

__options.invaders[i].splice(j,1);

continue;

}

this.image(__options.invaders[i][j][this.pattern]);

}

};

MAIN.prototype.view_tochika = function(){

if(typeof this.image_cache[__options.tochika.src] === "undefined"

|| typeof this.image_cache[__options.tochika.src].bitmap === "undefined"

|| !this.image_cache[__options.tochika.src].bitmap.length){return;}

if(typeof __options.tochikas === "undefined"){

this.init_tochilas_info();

}

// 配置間隔

var rate = __options.tochika.rate;

// 配置計算

var tochika_count = Math.floor(this.canvas_elm.offsetWidth / (__options.tochika.w * rate));

var margin = (this.canvas_elm.offsetWidth - ((__options.tochika.w * rate) * tochika_count)) / 2;

var centering = __options.tochika.w * (rate - 1) /2;

var y = this.canvas_elm.offsetHeight - 170;

for(var i in __options.tochikas){

__options.tochikas[i].x = margin + ((__options.tochika.w * rate) * i) + centering;

__options.tochikas[i].y = y;

__options.tochikas[i].bitsize = __options.tochikas[i].bitsize || this.image_cache[__options.tochika.src].bitsize;

__options.tochikas[i].h = __options.tochikas[i].bitsize * __options.tochikas[i].bitmap.length;

this.image(__options.tochikas[i]);

}

};

MAIN.prototype.init_invaders_info = function(){

// 配置マージン

margin = __options.invader_config.margin;

// 配置個数（w）

var count_w = Math.floor((__options.canvas_size.x - margin * 2) / __options.bitmap_size.w) -2;

// 敵機配置情報作成

__options.invaders = [];

for(var i=0; i<__options.invader_row_infos.length; i++){

var type = __options.invader_row_infos[i].invader;

__options.invaders[i] = [];

var srcs = __options.invader_src[type];

for(var j=0; j<count_w; j++){

__options.invaders[i][j] = [];

for(var k=0; k<srcs.length; k++){

__options.invaders[i][j][k] = {

color : __options.invader_row_infos[i].color,

x : (j * __options.bitmap_size.w) + margin,

y : (i * __options.bitmap_size.h) + margin,

type : type,

src : srcs[k]

};

}

};

MAIN.prototype.init_tochilas_info = function(){

__options.tochikas = [];

var rate = __options.tochika.rate;

var tochika_count = Math.floor(this.canvas_elm.offsetWidth / (__options.tochika.w * rate));

var bitmap = this.image_cache[__options.tochika.src].bitmap;

for(var i=0; i<tochika_count; i++){

__options.tochikas.push({

src : __options.tochika.src,

color : __options.tochika.color,

bitmap : JSON.parse(JSON.stringify(bitmap))

});

}

};

MAIN.prototype.image_cache = [];

MAIN.prototype.image = function(options){

if(!this.canvas_elm){return;}

if(!options){return;}

if(typeof this.image_cache[options.src] === "undefined"){return}

var bitmap = this.get_bitmap(options);

var bitsize = this.get_bitsize(options);

this.image_bit_make(bitmap , bitsize , options.color , options.x , options.y);

};

MAIN.prototype.get_bitmap = function(option){

if(typeof option.bitmap !== "undefined"){

return option.bitmap;

}

else if(typeof this.image_cache[option.src] !== "undefined"

&& typeof this.image_cache[option.src].bitmap !== "undefined"){

return this.image_cache[option.src].bitmap;

}

};

MAIN.prototype.get_bitsize = function(option){

if(typeof this.image_cache[option.src] !== "undefined"

|| typeof this.image_cache[option.src].bitsize !== "undefined"){

return this.image_cache[option.src].bitsize;

}

};

MAIN.prototype.image_bit_set = function(src , bitmap_size){

if(typeof this.image_cache[src] !== "undefined"){return;}

bitmap_size = bitmap_size || __options.bitmap_size.w;

this.image_cache[src] = {

bitsize : 0,

bitmap : []

};

new AJAX({

url : src,

methdo : "GET",

async : true,

onSuccess : (function(src , bitmap_size , data){

this.image_bit_loaded(src , bitmap_size , data);

}).bind(this , src , bitmap_size)

});

};

MAIN.prototype.image_bit_loaded = function(src , bitmap_size , data){

var char16 = data.split("\n");

var str_count = char16[0].length * 4;

var size = bitmap_size / str_count;

// ゼロパディング用桁数算出

var zero = new Array(str_count).fill("0").join("")

for(var i in char16){

// 16進数を２進数に変換

var char2 = parseInt(char16[i] , 16).toString(2);

// サイズ取得

this.image_cache[src].bitsize = size;

char2 = (zero + char2).slice(-str_count);

this.image_cache[src].bitmap.push(char2);

}

};

MAIN.prototype.image_bit_make = function(bitmap , bitsize , color , x , y){

if(!bitmap){return;}

color = color || "white";

this.ctx.fillStyle = color;

for(var i=0; i<bitmap.length; i++){

for(var j=0; j<bitmap[i].length; j++){

var bit = bitmap[i].charAt(j);

if(bit == 0){continue;}

var w = bitsize;

var h = bitsize;

this.ctx.fillRect(x+(j * w) , y+(i * h) , Math.ceil(w) , Math.ceil(h));

}

};

MAIN.prototype.animation_roop = function(time){

var func = (function(e){this.animation(e)}).bind(this);

this.animation_proc();

if(window.requestAnimationFrame

|| window.webkitRequestAnimationFrame

|| window.mozRequestAnimationFrame

|| window.oRequestAnimationFrame

|| window.msRequestAnimationFrame){

window.requestAnimationFrame(func);

}

else{

time = time || 10;

anim_flg = setTimeout(func , time);

}

};

MAIN.prototype.animation_proc = function(){

switch(this.keydown_flg){

case "right":

this.cannon_move(__options.cannon.x + __options.cannon.moveX);

break;

case "left":

this.cannon_move(__options.cannon.x - __options.cannon.moveX);

break;

}

this.animation_shoot();

};

MAIN.prototype.animation_shoot = function(){

if(!this.shoots.length){return;}

var bitsize = this.image_cache[__options.cannon.src].bitsize;

var w = bitsize * __options.cannon_shoot.w;

var h = bitsize * __options.cannon_shoot.h;

for(var i in this.shoots){

// collision

if(this.shoot_collision_tochika(this.shoots[i].x , this.shoots[i].y , w , h)){

this.shoots.splice(i,1);

}

else if(this.shoot_collision_invader(this.shoots[i].x , this.shoots[i].y , w , h)){

this.shoots.splice(i,1);

}

else if(this.shoots[i].y < h){

this.shoots.splice(i,1);

}

else{

this.ctx.fillStyle = "white";

this.ctx.fillRect(this.shoots[i].x - bitsize , this.shoots[i].y , w , h);

this.shoots[i].y -= bitsize * 2;

}

};

MAIN.prototype.animation_bullet = function(){

if(typeof this.bullets === "undefined" || !this.bullets.length){return;}

var current_time = (+new Date());

// アニメーションパターンのフレーム感覚

if(typeof this.bullet_anim_time === "undefined"){

this.bullet_anim_time = current_time;

}

// アニメーションパターンの切り替え

if(typeof this.bullet_anim_num === "undefined"){

this.bullet_anim_num = 0;

}

else if(current_time - this.bullet_anim_time > 50){

this.bullet_anim_time = current_time;

this.bullet_anim_num++;

if(this.bullet_anim_num >= __options.bullet_anim.length){

this.bullet_anim_num = 0;

}

var bitsize = this.image_cache[__options.bullet_anim[this.bullet_anim_num]].bitsize;

for(var i in this.bullets){

this.bullets[i].y += bitsize;

var y = this.bullets[i].y;

if(y > this.canvas_elm.offsetHeight){

this.bullets[i] = null;

}

else{

var option = {

x : this.bullets[i].x,

y : y = y,

src : __options.bullet_anim[this.bullet_anim_num],

color : __options.bullet.color

};

this.image(option);

}

var newArr = [];

for(var i in this.bullets){

if(!this.bullets[i]){continue;}

newArr.push(this.bullets[i]);

}

this.bullets = newArr;

};

MAIN.prototype.shoot_collision_invader = function(x , y , w , h){

var inv = __options.invaders;

for(var i in inv){

for(var j in inv[i]){

var ix = inv[i][j][0].x;

var iy = inv[i][j][0].y;

var iw = __options.bitmap_size.w;

var ih = __options.bitmap_size.h;

if(ix <= x && x <= ix + iw

&& iy <= y - h && y <= iy + ih){

for(var k=0; k<inv[i][j].length; k++){

inv[i][j][k].src = __options.invader_effect_1.src;

inv[i][j][k].shoot_flg = 1;

}

return true;

}

};

MAIN.prototype.shoot_collision_tochika = function(x , y , w , h){

for(var i in __options.tochikas){

var tx = __options.tochikas[i].x;

var ty = __options.tochikas[i].y;

var tw = __options.tochika.w;

var th = __options.tochikas[i].h;

if(tx <= x && x <= tx + tw

&& ty <= y + h && y <= ty + th){

return this.tochika_scrape_shoot(__options.tochikas[i] , x , y);

}

};

MAIN.prototype.tochika_scrape_shoot = function(tochika_data , shoot_x , shoot_y){

// 衝突したtochikaの下部分を検出

var x = shoot_x - tochika_data.x;

var y = shoot_y - tochika_data.y;

var dot_x = Math.round(x / tochika_data.bitsize);

var dot_y = Math.round(y / tochika_data.bitsize);

if(typeof tochika_data.bitmap[dot_y] === "undefined"){

dot_y = dot_y < 0 ? 0 : tochika_data.bitmap.length-1;

}

if(typeof tochika_data.bitmap[dot_y][dot_x] === "undefined"){

dot_x = dot_x < 0 ? 0 : tochika_data.bitmap[dot_y].length -1;

}

// 当たった座標のドット部分を選択衝突箇所以下を削除

for(var i=tochika_data.bitmap.length-1; i>=0; i--){

if(tochika_data.bitmap[i][dot_x] != 1){continue;}

var str = tochika_data.bitmap[i];

tochika_data.bitmap[i] = str.slice(0,dot_x).concat("0",str.slice(dot_x+1));

return true;

}

return false;

};

MAIN.prototype.cannon_move = function(pos){

if(pos < 0){

pos = 0;

}

else if(pos > this.canvas_elm.offsetWidth - __options.bitmap_size.w){

pos = this.canvas_elm.offsetWidth - __options.bitmap_size.w;

}

__options.cannon.x = pos;

};

MAIN.prototype.animation = function(){

this.clear();

this.nextPattern(300);

this.view();

this.animation_roop(30);

this.invader_bullet();

}

MAIN.prototype.nextPattern = function(frame_rate){

this.prev_time = this.prev_time || 0;

if((+new Date()) - this.prev_time < frame_rate){return}

this.prev_time = (+new Date());

this.pattern++;

if(this.pattern >= this.image_max){

this.pattern = 0;

}

this.invader_move();

};

MAIN.prototype.invader_move = function(){

// 左端の情報取得

var window_min = __options.invader_config.margin;

var window_max = this.canvas_elm.offsetWidth - __options.invader_config.margin;

var pos = this.invader_pos();

var move_x = __options.invader_config.move_x;

var move_y = 0;

var w = __options.bitmap_size.w;

// move y

if(typeof this.move_y_count !== "undefined" && this.move_y_count > 0){

this.move_y_count -= 1;

move_y = __options.invader_config.move_y;

move_x = 0;

}

// Dead end ->

else if(move_x > 0 && pos.max > window_max){

this.move_y_count = 1;

__options.invader_config.move_x = -__options.invader_config.move_x;

move_x = 0;

move_y = __options.invader_config.move_y;

}

// <- Dead end

else if(move_x < 0 && pos.min < window_min){

this.move_y_count = 1;

__options.invader_config.move_x = -__options.invader_config.move_x;

move_x = 0;

move_y = __options.invader_config.move_y;

}

this.invader_move_set(move_x , move_y);

};

// mode @ [min : 一番左端のinvaderの座標を取得 . max : 一番右端のinvaderの座標を取得]

MAIN.prototype.invader_pos = function(mode){

var min = null;

var max = null;

var inv = __options.invaders;

var w = __options.bitmap_size.w;

for(var i in inv){

for(var j in inv[i]){

if(min === null || min > inv[i][j][0].x){

min = inv[i][j][0].x;

}

if(max === null || max < inv[i][j][0].x + w){

max = inv[i][j][0].x + w;

}

if(mode === "min"){

return min;

}

else if(mode === "max"){

return max;

}

else{

return {min : min , max : max};

}

};

MAIN.prototype.invader_move_set = function(x,y){

var inv = __options.invaders;

for(var i in inv){

for(var j in inv[i]){

for(var k in inv[i][j]){

inv[i][j][k].x += x;

inv[i][j][k].y += y;

}

};

// 各列の一番下のインベーダーがミサイルを発射する（最大同時数:2）

MAIN.prototype.invader_bullet = function(){

if(typeof this.bullets === "undefined"){

this.bullets = [];

}

this.invader_bullet_add();

this.animation_bullet();

};

MAIN.prototype.invader_bullet_add = function(){

if(this.bullets.length >= __options.bullet_anim.length){return;}

if(Math.floor(Math.random() * Math.floor(100)) > 10){return;}

var bottoms = this.get_invader_bottoms();

var keys = Object.keys(bottoms);

if(!bottoms || !keys.length){return;}

var rnd_num = Math.floor(Math.random() * Math.floor(keys.length));

var data = {

x : bottoms[keys[rnd_num]].x,

y : bottoms[keys[rnd_num]].y + __options.bitmap_size.h

};

this.bullets.push(data);

};

// 各列の最下部インベーダー一覧の取得

MAIN.prototype.get_invader_bottoms = function(){

var inv = __options.invaders;

var bottoms = {};

for(var i=inv.length-1; i>=0; i--){

for(var j in inv[i]){

if(!inv[i][j]){continue;}

var x = inv[i][j][0].x;

if(typeof bottoms[x] !== "undefined"){continue;}

bottoms[x] = inv[i][j][0];

}

return bottoms;

};

MAIN.prototype.set_imageMax = function(){

for(var i in __options.invader_src){

this.image_max = __options.invader_src[i].length;

break;

}

};

/* Event */

MAIN.prototype.event_set = function(){

new LIB().event(w , "click" , (function(e){this.click(e)}).bind(this));

new LIB().event(w , "keydown" , (function(e){this.keydown(e)}).bind(this));

new LIB().event(w , "keyup" , (function(e){this.keyup(e)}).bind(this));

new LIB().event(w , "mousemove" , (function(e){this.mousemove(e)}).bind(this));

new LIB().event(w , "touchmove" , (function(e){this.touchmove(e)}).bind(this));

new LIB().event(w , "touchend" , (function(e){this.touchend(e)}).bind(this));

};

MAIN.prototype.click = function(e){

this.shoot_add();

};

MAIN.prototype.shoot_add = function(){

if(this.shoots.length < 2){

this.shoots.push({

x : __options.cannon.x + (__options.bitmap_size.w / 2),

y : __options.cannon.y + (__options.cannon.bitSize * 4)

});

}

};

MAIN.prototype.keydown = function(e){

switch(e.keyCode){

case 37: // <-

case 'ArrowLeft':

this.keydown_flg = "left";

break;

case 39: // ->

case 'ArrowRight':

this.keydown_flg = "right";

break;

case 32: // space

this.shoot_add();

break;

}

};

MAIN.prototype.keyup = function(e){

this.keydown_flg = false;

};

MAIN.prototype.mousemove = function(e){

// if(this.flg_gamestart !== true){return;}

this.mousePos = this.mousePos || e.clientX;

this.cannon_move(__options.cannon.x + (e.clientX - this.mousePos));

this.mousePos = e.clientX;

};

MAIN.prototype.touchmove = function(e){

// if(this.flg_gamestart !== true){return;}

if(!e || !e.touches || e.touches.length > 1){

this.mousePos = null;

return;

}

this.mousePos = typeof this.mousePos === "number" ? this.mousePos : e.touches[0].clientX;

this.cannon_move(__options.cannon.x + (e.touches[0].clientX - this.mousePos));

this.mousePos = e.touches[0].clientX;

};

MAIN.prototype.touchend = function(e){

this.mousePos = null;

};

var LIB = function(){};

LIB.prototype.event = function(target, mode, func , flg){

flg = (flg) ? flg : false;

if (target.addEventListener){target.addEventListener(mode, func, flg)}

else{target.attachEvent('on' + mode, function(){func.call(target , window.event)})}

};

var AJAX = function(option){

if(!option){return}

var httpoj = this.createHttpRequest();

if(!httpoj){return;}

// var option = new MAIN().setOption(options);

var data = this.setQuery(option);

if(!data.length){

option.method = "get";

}

httpoj.open( option.method , option.url , option.async );

httpoj.setRequestHeader('Content-Type', option.type);

httpoj.onreadystatechange = function(){

if (this.readyState==4 && httpoj.status == 200){

option.onSuccess(this.responseText);

}

};

// FormData 送信用

if(typeof option.form === "object" && Object.keys(option.form).length){

httpoj.send(option.form);

}

// query整形後送信

else{

if(data.length){

httpoj.send(data.join("&"));

}

else{

httpoj.send();

}

};

AJAX.prototype.dataOption = {

url:"",

query:{},

querys:[],

data:{},

form:{},

async:"true",

method:"POST",

type:"application/x-www-form-urlencoded",

onSuccess:function(res){},

onError:function(res){}

};

AJAX.prototype.createHttpRequest = function(){

//Win ie用

if(window.ActiveXObject){

//MSXML2以降用;

try{return new ActiveXObject("Msxml2.XMLHTTP")}

catch(e){

//旧MSXML用;

try{return new ActiveXObject("Microsoft.XMLHTTP")}

catch(e2){return null}

}

//Win ie以外のXMLHttpRequestオブジェクト実装ブラウザ用;

else if(window.XMLHttpRequest){return new XMLHttpRequest()}

else{return null}

};

// URL-Queryの作成

AJAX.prototype.setQuery = function(option){

var data = [];

if(typeof option.datas !== "undefined"){

for(var key of option.datas.keys()){

data.push(key + "=" + option.datas.get(key));

}

if(typeof option.query !== "undefined"){

for(var i in option.query){

data.push(i+"="+encodeURIComponent(option.query[i]));

}

if(typeof option.querys !== "undefined"){

for(var i=0;i<option.querys.length;i++){

if(typeof option.querys[i] == "Array"){

data.push(option.querys[i][0]+"="+encodeURIComponent(option.querys[i][1]));

}

else{

var sp = option.querys[i].split("=");

data.push(sp[0]+"="+encodeURIComponent(sp[1]));

}

return data;

}

new LIB().event(w , "load" , function(){new MAIN("#mycanvas")});

})(window,document);

解説

今回は、敵機が攻撃をする処理のミサイル発射（＆アニメーション）を追加しました。
bullet関係の関数がほぼそれですが、本家の動画を見ていると、ミサイル自体にもアニメーションがついていたので、2パターンのアニメーションを30ミリ秒で動かすようにしてみました。

難しかった点としては、インベーダーの一番下の行だけが攻撃してくるという仕様（ビデオをみて、おそらくそうではないかと・・・）のため、最下段のインベーダーを抽出する処理にハマりポイントがありました。

ゲーム開始時は、全く問題ないのですが、敵機を何機かやっつけた際に、インベーダーの中断からミサイルが発射されるのをみつけて、何かしらのバグが存在することに気が付き調べていると、以下のような配列で起きがちな不具合に気が付きました。

【問題のある処理】
1. インベーダーは、行と列の2次元配列に格納されている。
2. 格納されているデータには、それぞれ座標を保持している。
3. 行を下から列の箇所を抜き取り、列の配列位置に格納。
4. 同じ列位置のデータ（それより上のインベーダ）は、値があっても、無視する。

【発生した問題】
1. インベーダーの最下段以外からのミサイルの発射

【原因】
1. インベーダーのデータを格納している配列で、自機でやっつけられたデータは、sliceを使って削除されていた。
2. 同じ列にいるインベーダーだが、配列番号が同じではなかった。

【解決方法】
1. 最下段を取得する処理（get_invader_bottoms関数）で、配列の番号ではなく、インベーダーのX座標をキーにして列判定を行う。
2. 連想配列になるので、invader_bullet_add関数での、ランダム取得をする際は、Object.keysで、配列取得した一覧のランダムを取得する方式に切り替え

上記のような工程で、バグを解消することができました。

バグを見つけるまではストレスですが、解消した時は、大きなパズルを解いた感覚になります。

いや〜自分の作ったプログラムでの原因追求って、レベルアップを大きく感じられますね。

あっ！敵キャラのミサイルは、まだコリジョン設定をしていないので、当たっても死にませんよ。

Github

ソースは以下にアップしています。(ver:0.10)

https://github.com/yugeta/game_invader

Program canvas, invader, JavaScript

Tips of Rubbish

DIYとIoTをこよなく愛する、WEB関連やデジモノなどの雑多な情報ブログ