ゲームライブラリ構築までの道「インベーダー編」#8 : 敵キャラ行進

Posted on 2020/07/27 by 下駄

Pocket

Check

こんにちわ。

インベーダの敵キャラは極めて統制の取れた軍隊だと気がついた、下駄です。

今回は、敵キャラを移動させて、ゲーム感MAXな状態にしたいと思います。

動いている敵キャラを見ると、はやくシューティングしたくて、うずうずしてきますよね。

本日のIT謎掛け

「モーションコントロール」と、かけまして、

「地下水質状態の危険性」と、ときます。

そのココロは・・・

イドー（移動と井戸）の状態を管理することが大事です。

ソースコード

(function(w,d){

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

    cannon : {
      type  : "cannon",
      color : "#57F2D6",
      bitSize : 4,
      src   : "images/dot/cannon.dot",
      x : 0 , y : 0,
      moveX : 10
    },
    ufo : {
      type  : "ufo",
      color : "white",
      src   : "images/dot/ufo.dot",
      x : 0 , y : 0,
      moveX : 10
    },
    bullet : {
      type  : "bullet",
      color : "white",
      src   : "images/dot/bullet.dot",
      x : 0 , y : 0,
      moveX : 10
    },

    tochika : {
      type  : "tochika",
      color : "red",
      src   : "images/dot/tochika.dot",
      w     : 72
    },
    
    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
    }
  };

  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]);
    }
    this.image_bit_set(__options.cannon.src);
    this.image_bit_set(__options.ufo.src);
    this.image_bit_set(__options.bullet.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]){
        this.image(__options.invaders[i][j][this.pattern]);
      }
    }
  };

  MAIN.prototype.view_tochika = function(){
    // 配置間隔
    var rate = 2.5;
    // 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=0; i<tochika_count; i++){
      var x = margin + ((__options.tochika.w * rate) * i) + centering;
      var option = JSON.parse(JSON.stringify(__options.tochika));
      option.x = x;
      option.y = y;
      this.image(option);
    }
  };

  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.image_cache = [];
  MAIN.prototype.image = function(options){
    if(!this.canvas_elm){return;}
    if(!options){return;}
    if(typeof this.image_cache[options.src] !== "undefined"){
      this.image_bit_make(options);
    }
  };

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

    var bitmap  = this.image_cache[options.src].bitmap;
    var bitsize = this.image_cache[options.src].bitsize;
    this.ctx.fillStyle   = options.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;
        var x = options.x + (j * w);
        var y = options.y + (i * h);
        this.ctx.fillRect(x , y , 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;}
    for(var i in this.shoots){
      var w = 1 * __options.cannon.bitSize;
      var h = 2 * __options.cannon.bitSize;
      if(this.shoots[i].y < h){
        this.shoots.splice(i,1);
      }
      else{
        this.ctx.fillStyle   = "white";
        this.ctx.fillRect(this.shoots[i].x - __options.cannon.bitSize , this.shoots[i].y , w , h);
        this.shoots[i].y -= __options.cannon.bitSize * 2;
      }
    }
  };

  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);
  }
  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){
      // move_x = window_max - pos.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){
      // move_x = window_min - pos.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;
    var w   = __options.bitmap_size.w;
    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;
        }
      }
    }
  };


  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);

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

524

525

526

527

528

529

530

531

532

533

534

535

536

537

538

539

540

541

542

543

544

545

546

547

548

549

550

551

552

553

554

555

556

557

558

559

560

561

562

563

564

565

566

567

568

569

570

571

572

573

574

575

576

577

578

579

580

581

582

(function(w,d){

var __options = {

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

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

cannon : {

type : "cannon",

color : "#57F2D6",

bitSize : 4,

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

x : 0 , y : 0,

moveX : 10

ufo : {

type : "ufo",

color : "white",

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

x : 0 , y : 0,

moveX : 10

bullet : {

type : "bullet",

color : "white",

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

x : 0 , y : 0,

moveX : 10

tochika : {

type : "tochika",

color : "red",

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

w : 72

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

}

};

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]);

}

this.image_bit_set(__options.cannon.src);

this.image_bit_set(__options.ufo.src);

this.image_bit_set(__options.bullet.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]){

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

}

};

MAIN.prototype.view_tochika = function(){

// 配置間隔

var rate = 2.5;

// 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=0; i<tochika_count; i++){

var x = margin + ((__options.tochika.w * rate) * i) + centering;

var option = JSON.parse(JSON.stringify(__options.tochika));

option.x = x;

option.y = y;

this.image(option);

}

};

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.image_cache = [];

MAIN.prototype.image = function(options){

if(!this.canvas_elm){return;}

if(!options){return;}

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

this.image_bit_make(options);

}

};

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(options){

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

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

|| typeof this.image_cache[options.src].bitsize === "undefined"){return;}

var bitmap = this.image_cache[options.src].bitmap;

var bitsize = this.image_cache[options.src].bitsize;

this.ctx.fillStyle = options.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;

var x = options.x + (j * w);

var y = options.y + (i * h);

this.ctx.fillRect(x , y , 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;}

for(var i in this.shoots){

var w = 1 * __options.cannon.bitSize;

var h = 2 * __options.cannon.bitSize;

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

this.shoots.splice(i,1);

}

else{

this.ctx.fillStyle = "white";

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

this.shoots[i].y -= __options.cannon.bitSize * 2;

}

};

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);

}

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){

// move_x = window_max - pos.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){

// move_x = window_min - pos.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;

var w = __options.bitmap_size.w;

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;

}

};

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

今回のは、敵キャラ移動用の関数をいくつか作りました。

関数 : invader_move

この関数は、敵キャラがアニメーションする時に呼び出される関数で、移動する方向や、端に行った時に、折返しをする処理をします。

折返しをする時に、数パターンY軸（縦）にも移動して、インベーダーが迫ってくる処理をしています。

関数 : invader_pos

たくさんいるインベーダが画面の端にいったかどうかの座標判定をする用の座標を取得しています。

ゲームの特性として、すべてのインベーダの座標をチェックしなければいけないので、少し無駄に感じますが、敵キャラをやっつけていって数が少なくなっていくと、処理自体が少なくなってくるので、その昔インベーダーゲームをやっていて、敵キャラが減ると、敵の動きが早くなるのは、こうした処理をして、処理スピードが上がっていたんだとなんとなく想像できました。

非常によく考えられたプログラムと、感動すらしますね。

関数 : invader_move_set

実際の移動処理は、この関数で行っていますが、表示をするときのためのメモリに持っている座標の値を行進しています。

Github

ソースは以下にアップしています。(ver:0.7)

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