public/javascripts/components/game.js

   1 // TODO: use indexedDB instead of localStorage: more flexible.
   2
   3 Vue.component('my-game', {
   4     data: function() {
   5         return {
   6             vr: null, //object to check moves, store them, FEN..
   7             mycolor: "w",
   8             possibleMoves: [], //filled after each valid click/dragstart
   9             choices: [], //promotion pieces, or checkered captures... (contain possible pieces)
  10             start: {}, //pixels coordinates + id of starting square (click or drag)
  11             selectedPiece: null, //moving piece (or clicked piece)
  12             conn: null, //socket messages
  13             endofgame: "", //end of game message
  14             mode: "idle", //human, computer or idle (when not playing)
  15             oppid: "", //opponent ID in case of HH game
  16             oppConnected: false,
  17         };
  18     },
  19     render(h) {
  20         let [sizeX,sizeY] = VariantRules.size;
  21         // Precompute hints squares to facilitate rendering
  22         let hintSquares = doubleArray(sizeX, sizeY, false);
  23         this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
  24         let elementArray = [];
  25         let square00 = document.getElementById("sq-0-0");
  26         let squareWidth = !!square00
  27             ? parseFloat(window.getComputedStyle(square00).width.slice(0,-2))
  28             : 0;
  29         let actionArray = [
  30             h('button',
  31                 {
  32                     on: {
  33                         click: () => {
  34                             if (localStorage.getItem("newgame") === variant)
  35                                 delete localStorage["newgame"]; //cancel game seek
  36                             else
  37                             {
  38                                 localStorage["newgame"] = variant;
  39                                 this.newGame("human");
  40                             }
  41                         }
  42                     },
  43                     attrs: { "aria-label": 'New game VS human' },
  44                     'class': { "tooltip":true },
  45                 },
  46                 [h('i', { 'class': { "material-icons": true } }, "accessibility")]),
  47             h('button',
  48                 {
  49                     on: { click: () => this.newGame("computer") },
  50                     attrs: { "aria-label": 'New game VS computer' },
  51                     'class': { "tooltip":true },
  52                 },
  53                 [h('i', { 'class': { "material-icons": true } }, "computer")])
  54         ];
  55         if (!!this.vr)
  56         {
  57             if (this.mode == "human")
  58             {
  59                 let connectedIndic = h(
  60                     'div',
  61                     {
  62                         "class": {
  63                             "connected": this.oppConnected,
  64                             "disconnected": !this.oppConnected,
  65                         },
  66                     }
  67                 );
  68                 elementArray.push(connectedIndic);
  69             }
  70             let choices = h('div',
  71                 {
  72                     attrs: { "id": "choices" },
  73                     'class': { 'row': true },
  74                     style: {
  75                         //"position": "relative",
  76                         "display": this.choices.length>0?"block":"none",
  77                         "top": "-" + ((sizeY/2)*squareWidth+squareWidth/2) + "px",
  78                         "width": (this.choices.length * squareWidth) + "px",
  79                         "height": squareWidth + "px",
  80                     },
  81                 },
  82                 this.choices.map( m => { //a "choice" is a move
  83                     return h('div',
  84                         {
  85                             'class': { 'board': true },
  86                             style: {
  87                                 'width': (100/this.choices.length) + "%",
  88                                 'padding-bottom': (100/this.choices.length) + "%",
  89                             },
  90                         },
  91                         [h('img',
  92                             {
  93                                 attrs: { "src": '/images/pieces/' + VariantRules.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
  94                                 'class': { 'choice-piece': true, 'board': true },
  95                                 on: { "click": e => { this.play(m); this.choices=[]; } },
  96                             })
  97                         ]
  98                     );
  99                 })
 100             );
 101             // Create board element (+ reserves if needed by variant or mode)
 102             let gameDiv = h('div',
 103                 {
 104                     'class': { 'game': true },
 105                 },
 106                 [_.range(sizeX).map(i => {
 107                     let ci = this.mycolor=='w' ? i : sizeX-i-1;
 108                     return h(
 109                         'div',
 110                         {
 111                             'class': {
 112                                 'row': true,
 113                             },
 114                             style: { 'opacity': this.choices.length>0?"0.5":"1" },
 115                         },
 116                         _.range(sizeY).map(j => {
 117                             let cj = this.mycolor=='w' ? j : sizeY-j-1;
 118                             let elems = [];
 119                             if (this.vr.board[ci][cj] != VariantRules.EMPTY)
 120                             {
 121                                 elems.push(
 122                                     h(
 123                                         'img',
 124                                         {
 125                                             'class': {
 126                                                 'piece': true,
 127                                                 'ghost': !!this.selectedPiece && this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
 128                                             },
 129                                             attrs: {
 130                                                 src: "/images/pieces/" + VariantRules.getPpath(this.vr.board[ci][cj]) + ".svg",
 131                                             },
 132                                         }
 133                                     )
 134                                 );
 135                             }
 136                             if (hintSquares[ci][cj])
 137                             {
 138                                 elems.push(
 139                                     h(
 140                                         'img',
 141                                         {
 142                                             'class': {
 143                                                 'mark-square': true,
 144                                             },
 145                                             attrs: {
 146                                                 src: "/images/mark.svg",
 147                                             },
 148                                         }
 149                                     )
 150                                 );
 151                             }
 152                             const lm = this.vr.lastMove;
 153                             const highlight = !!lm && _.isMatch(lm.end, {x:ci,y:cj}); //&& _.isMatch(lm.start, {x:ci,y:cj})
 154                             return h(
 155                                 'div',
 156                                 {
 157                                     'class': {
 158                                         'board': true,
 159                                         'light-square': !highlight && (i+j)%2==0,
 160                                         'dark-square': !highlight && (i+j)%2==1,
 161                                         'highlight': highlight,
 162                                     },
 163                                     attrs: {
 164                                         id: this.getSquareId({x:ci,y:cj}),
 165                                     },
 166                                 },
 167                                 elems
 168                             );
 169                         })
 170                     );
 171                 }), choices]
 172             );
 173             actionArray.push(
 174                 h('button',
 175                     {
 176                         on: { click: this.resign },
 177                         attrs: { "aria-label": 'Resign' },
 178                         'class': { "tooltip":true },
 179                     },
 180                     [h('i', { 'class': { "material-icons": true } }, "flag")])
 181             );
 182             elementArray.push(gameDiv);
 183     //          if (!!vr.reserve)
 184     //          {
 185     //              let reserve = h('div',
 186     //                  {'class':{'game':true}}, [
 187     //                      h('div',
 188     //                          { 'class': { 'row': true }},
 189     //                          [
 190     //                              h('div',
 191     //                                  {'class':{'board':true}},
 192     //                                  [h('img',{'class':{"piece":true},attrs:{"src":"/images/pieces/wb.svg"}})]
 193     //                              )
 194     //                          ]
 195     //                      )
 196     //                  ],
 197     //              );
 198     //              elementArray.push(reserve);
 199     //          }
 200             const modalEog = [
 201                 h('input',
 202                     {
 203                         attrs: { "id": "modal-control", type: "checkbox" },
 204                         "class": { "modal": true },
 205                     }),
 206                 h('div',
 207                     {
 208                         attrs: { "role": "dialog", "aria-labelledby": "dialog-title" },
 209                     },
 210                     [
 211                         h('div',
 212                             {
 213                                 "class": { "card": true, "smallpad": true },
 214                             },
 215                             [
 216                                 h('label',
 217                                     {
 218                                         attrs: { "for": "modal-control" },
 219                                         "class": { "modal-close": true },
 220                                     }
 221                                 ),
 222                                 h('h3',
 223                                     {
 224                                         "class": { "section": true },
 225                                         domProps: { innerHTML: "End of game" },
 226                                     }
 227                                 ),
 228                                 h('p',
 229                                     {
 230                                         "class": { "section": true },
 231                                         domProps: { innerHTML: this.endofgame },
 232                                     }
 233                                 )
 234                             ]
 235                         )
 236                     ]
 237                 )
 238             ];
 239             elementArray = elementArray.concat(modalEog);
 240         }
 241         const modalNewgame = [
 242             h('input',
 243                 {
 244                     attrs: { "id": "modal-control2", type: "checkbox" },
 245                     "class": { "modal": true },
 246                 }),
 247             h('div',
 248                 {
 249                     attrs: { "role": "dialog", "aria-labelledby": "dialog-title" },
 250                 },
 251                 [
 252                     h('div',
 253                         {
 254                             "class": { "card": true, "smallpad": true },
 255                         },
 256                         [
 257                             h('label',
 258                                 {
 259                                     attrs: { "id": "close-newgame", "for": "modal-control2" },
 260                                     "class": { "modal-close": true },
 261                                 }
 262                             ),
 263                             h('h3',
 264                                 {
 265                                     "class": { "section": true },
 266                                     domProps: { innerHTML: "New game" },
 267                                 }
 268                             ),
 269                             h('p',
 270                                 {
 271                                     "class": { "section": true },
 272                                     domProps: { innerHTML: "Waiting for opponent..." },
 273                                 }
 274                             )
 275                         ]
 276                     )
 277                 ]
 278             )
 279         ];
 280         elementArray = elementArray.concat(modalNewgame);
 281         const actions = h('div',
 282             {
 283                 attrs: { "id": "actions" },
 284                 'class': { 'text-center': true },
 285             },
 286             actionArray
 287         );
 288         elementArray.push(actions);
 289         return h(
 290             'div',
 291             {
 292                 'class': {
 293                     "col-sm-12":true,
 294                     "col-md-8":true,
 295                     "col-md-offset-2":true,
 296                     "col-lg-6":true,
 297                     "col-lg-offset-3":true,
 298                 },
 299                 // NOTE: click = mousedown + mouseup --> what about smartphone?!
 300                 on: {
 301                     mousedown: this.mousedown,
 302                     mousemove: this.mousemove,
 303                     mouseup: this.mouseup,
 304                     touchdown: this.mousedown,
 305                     touchmove: this.mousemove,
 306                     touchup: this.mouseup,
 307                 },
 308             },
 309             elementArray
 310         );
 311     },
 312     created: function() {
 313         const url = socketUrl;
 314         const continuation = (localStorage.getItem("variant") === variant);
 315         this.myid = continuation
 316             ? localStorage.getItem("myid")
 317             // random enough (TODO: function)
 318             : (Date.now().toString(36) + Math.random().toString(36).substr(2, 7)).toUpperCase();
 319         this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 320         const socketOpenListener = () => {
 321             if (continuation)
 322             {
 323                 // TODO: check FEN integrity with opponent
 324                 this.newGame("human", localStorage.getItem("fen"),
 325                     localStorage.getItem("mycolor"), localStorage.getItem("oppid"), true);
 326                 // Send ping to server, which answers pong if opponent is connected
 327                 this.conn.send(JSON.stringify({code:"ping", oppid:this.oppId}));
 328             }
 329             else if (localStorage.getItem("newgame") === variant)
 330             {
 331                 // New game request has been cancelled on disconnect
 332                 this.newGame("human");
 333             }
 334         };
 335         const socketMessageListener = msg => {
 336             const data = JSON.parse(msg.data);
 337             switch (data.code)
 338             {
 339                 case "newgame": //opponent found
 340                     this.newGame("human", data.fen, data.color, data.oppid); //oppid: opponent socket ID
 341                     break;
 342                 case "newmove": //..he played!
 343                     this.play(data.move, "animate");
 344                     break;
 345                 case "pong": //sent when opponent stayed online after we disconnected
 346                     this.oppConnected = true;
 347                     break;
 348                 case "resign": //..you won!
 349                     this.endGame("Victory!");
 350                     break;
 351                 // TODO: also use (dis)connect info to count online players
 352                 case "connect":
 353                 case "disconnect":
 354                     if (this.mode == "human" && this.oppid == data.id)
 355                         this.oppConnected = (data.code == "connect");
 356                     break;
 357             }
 358         };
 359         const socketCloseListener = () => {
 360             console.log("Lost connection -- reconnect");
 361             this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 362             this.conn.addEventListener('open', socketOpenListener);
 363             this.conn.addEventListener('message', socketMessageListener);
 364             this.conn.addEventListener('close', socketCloseListener);
 365         };
 366         this.conn.onopen = socketOpenListener;
 367         this.conn.onmessage = socketMessageListener;
 368         this.conn.onclose = socketCloseListener;
 369     },
 370     methods: {
 371         endGame: function(message) {
 372             this.endofgame = message;
 373             document.getElementById("modal-control").checked = true;
 374             if (this.mode == "human")
 375                 this.clearStorage();
 376             this.mode = "idle";
 377             this.oppid = "";
 378         },
 379         resign: function() {
 380             if (this.mode == "human" && this.oppConnected)
 381             {
 382                 try {
 383                     this.conn.send(JSON.stringify({code: "resign", oppid: this.oppid}));
 384                 } catch (INVALID_STATE_ERR) {
 385                     return; //resign failed for some reason...
 386                 }
 387             }
 388             this.endGame("Try again!");
 389         },
 390         updateStorage: function() {
 391             if (!localStorage.getItem("myid"))
 392             {
 393                 localStorage.setItem("myid", this.myid);
 394                 localStorage.setItem("variant", variant);
 395                 localStorage.setItem("mycolor", this.mycolor);
 396                 localStorage.setItem("oppid", this.oppid);
 397             }
 398             localStorage.setItem("fen", this.vr.getFen());
 399         },
 400         clearStorage: function() {
 401             delete localStorage["variant"];
 402             delete localStorage["myid"];
 403             delete localStorage["mycolor"];
 404             delete localStorage["oppid"];
 405             delete localStorage["fen"];
 406         },
 407         newGame: function(mode, fenInit, color, oppId, continuation) {
 408             const fen = fenInit || VariantRules.GenRandInitFen();
 409             console.log(fen); //DEBUG
 410             if (mode=="human" && !oppId)
 411             {
 412                 // Send game request and wait..
 413                 this.clearStorage(); //in case of
 414                 try {
 415                     this.conn.send(JSON.stringify({code:"newgame", fen:fen}));
 416                 } catch (INVALID_STATE_ERR) {
 417                     return; //nothing achieved
 418                 }
 419                 document.getElementById("modal-control2").checked = true;
 420                 return;
 421             }
 422             this.vr = new VariantRules(fen);
 423             this.mode = mode;
 424             if (mode=="human")
 425             {
 426                 // Opponent found!
 427                 if (!continuation)
 428                 {
 429                     // Playing sound fails on game continuation:
 430                     new Audio("/sounds/newgame.mp3").play();
 431                     document.getElementById("modal-control2").checked = false;
 432                 }
 433                 this.oppid = oppId;
 434                 this.oppConnected = true;
 435                 this.mycolor = color;
 436                 delete localStorage["newgame"]; //in case of
 437             }
 438             else //against computer
 439             {
 440                 this.mycolor = Math.random() < 0.5 ? 'w' : 'b';
 441                 if (this.mycolor == 'b')
 442                     setTimeout(this.playComputerMove, 500);
 443             }
 444         },
 445         playComputerMove: function() {
 446             const compColor = this.mycolor=='w' ? 'b' : 'w';
 447             const compMove = this.vr.getComputerMove(compColor);
 448             // HACK: avoid selecting elements before they appear on page:
 449             setTimeout(() => this.play(compMove, "animate"), 500);
 450         },
 451         // Get the identifier of a HTML table cell from its numeric coordinates o.x,o.y.
 452         getSquareId: function(o) {
 453             // NOTE: a separator is required to allow any size of board
 454             return  "sq-" + o.x + "-" + o.y;
 455         },
 456         // Inverse function
 457         getSquareFromId: function(id) {
 458             let idParts = id.split('-');
 459             return [parseInt(idParts[1]), parseInt(idParts[2])];
 460         },
 461         mousedown: function(e) {
 462             e = e || window.event;
 463             e.preventDefault(); //disable native drag & drop
 464             if (!this.selectedPiece && e.target.classList.contains("piece"))
 465             {
 466                 // Next few lines to center the piece on mouse cursor
 467                 let rect = e.target.parentNode.getBoundingClientRect();
 468                 this.start = {
 469                     x: rect.x + rect.width/2,
 470                     y: rect.y + rect.width/2,
 471                     id: e.target.parentNode.id
 472                 };
 473                 this.selectedPiece = e.target.cloneNode();
 474                 this.selectedPiece.style.position = "absolute";
 475                 this.selectedPiece.style.top = 0;
 476                 this.selectedPiece.style.display = "inline-block";
 477                 this.selectedPiece.style.zIndex = 3000;
 478                 let startSquare = this.getSquareFromId(e.target.parentNode.id);
 479                 this.possibleMoves = this.vr.canIplay(this.mycolor,startSquare)
 480                     ? this.vr.getPossibleMovesFrom(startSquare)
 481                     : [];
 482                 e.target.parentNode.appendChild(this.selectedPiece);
 483             }
 484         },
 485         mousemove: function(e) {
 486             if (!this.selectedPiece)
 487                 return;
 488             e = e || window.event;
 489             // If there is an active element, move it around
 490             if (!!this.selectedPiece)
 491             {
 492                 this.selectedPiece.style.left = (e.clientX-this.start.x) + "px";
 493                 this.selectedPiece.style.top = (e.clientY-this.start.y) + "px";
 494             }
 495         },
 496         mouseup: function(e) {
 497             if (!this.selectedPiece)
 498                 return;
 499             e = e || window.event;
 500             // Read drop target (or parentElement, parentNode... if type == "img")
 501             this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coordinates
 502             let landing = document.elementFromPoint(e.clientX, e.clientY);
 503             this.selectedPiece.style.zIndex = 3000;
 504             while (landing.tagName == "IMG") //classList.contains(piece) fails because of mark/highlight
 505                 landing = landing.parentNode;
 506             if (this.start.id == landing.id) //a click: selectedPiece and possibleMoves already filled
 507                 return;
 508             // OK: process move attempt
 509             let endSquare = this.getSquareFromId(landing.id);
 510             let moves = this.findMatchingMoves(endSquare);
 511             this.possibleMoves = [];
 512             if (moves.length > 1)
 513                 this.choices = moves;
 514             else if (moves.length==1)
 515                 this.play(moves[0]);
 516             // Else: impossible move
 517             this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 518             delete this.selectedPiece;
 519             this.selectedPiece = null;
 520         },
 521         findMatchingMoves: function(endSquare) {
 522             // Run through moves list and return the matching set (if promotions...)
 523             let moves = [];
 524             this.possibleMoves.forEach(function(m) {
 525                 if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
 526                     moves.push(m);
 527             });
 528             return moves;
 529         },
 530         animateMove: function(move) {
 531             let startSquare = document.getElementById(this.getSquareId(move.start));
 532             let endSquare = document.getElementById(this.getSquareId(move.end));
 533             let rectStart = startSquare.getBoundingClientRect();
 534             let rectEnd = endSquare.getBoundingClientRect();
 535             let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
 536             let movingPiece = document.querySelector("#" + this.getSquareId(move.start) + " > img.piece");
 537             // HACK for animation (otherwise with positive translate, image slides "under background"...)
 538             // Possible improvement: just alter squares on the piece's way...
 539             squares = document.getElementsByClassName("board");
 540             for (let i=0; i<squares.length; i++)
 541             {
 542                 let square = squares.item(i);
 543                 if (square.id != this.getSquareId(move.start))
 544                     square.style.zIndex = "-1";
 545             }
 546             movingPiece.style.transform = "translate(" + translation.x + "px," + translation.y + "px)";
 547             movingPiece.style.transitionDuration = "0.2s";
 548             movingPiece.style.zIndex = "3000";
 549             setTimeout( () => {
 550                 for (let i=0; i<squares.length; i++)
 551                     squares.item(i).style.zIndex = "auto";
 552                 movingPiece.style = {}; //required e.g. for 0-0 with KR swap
 553                 this.play(move);
 554             }, 200);
 555         },
 556         play: function(move, programmatic) {
 557             if (!!programmatic) //computer or human opponent
 558             {
 559                 this.animateMove(move);
 560                 return;
 561             }
 562             // Not programmatic, or animation is over
 563             if (this.mode == "human" && this.vr.turn == this.mycolor)
 564             {
 565                 if (!this.oppConnected)
 566                     return; //abort move if opponent is gone
 567                 try {
 568                     this.conn.send(JSON.stringify({code:"newmove", move:move, oppid:this.oppid}));
 569                 } catch(INVALID_STATE_ERR) {
 570                     return; //abort also if sending failed
 571                 }
 572             }
 573             new Audio("/sounds/chessmove1.mp3").play();
 574             this.vr.play(move, "ingame");
 575             if (this.mode == "human")
 576                 this.updateStorage(); //after our moves and opponent moves
 577             const eog = this.vr.checkGameOver(this.vr.turn);
 578             if (eog != "*")
 579                 this.endGame(eog);
 580             else if (this.mode == "computer" && this.vr.turn != this.mycolor)
 581                 setTimeout(this.playComputerMove, 500);
 582         },
 583     },
 584 })