public/javascripts/components/game.js

   1 // TODO: use indexedDB instead of localStorage? (more flexible: allow several games)
   2 Vue.component('my-game', {
   3     data: function() {
   4         return {
   5             vr: null, //object to check moves, store them, FEN..
   6             mycolor: "w",
   7             possibleMoves: [], //filled after each valid click/dragstart
   8             choices: [], //promotion pieces, or checkered captures... (contain possible pieces)
   9             start: {}, //pixels coordinates + id of starting square (click or drag)
  10             selectedPiece: null, //moving piece (or clicked piece)
  11             conn: null, //socket messages
  12             score: "*", //'*' means 'unfinished'
  13             mode: "idle", //human, computer or idle (when not playing)
  14             oppid: "", //opponent ID in case of HH game
  15             oppConnected: false,
  16             seek: false,
  17             fenStart: "",
  18             incheck: [],
  19         };
  20     },
  21     render(h) {
  22         let [sizeX,sizeY] = VariantRules.size;
  23         // Precompute hints squares to facilitate rendering
  24         let hintSquares = doubleArray(sizeX, sizeY, false);
  25         this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
  26         // Also precompute in-check squares
  27         let incheckSq = doubleArray(sizeX, sizeY, false);
  28         this.incheck.forEach(sq => { incheckSq[sq[0]][sq[1]] = true; });
  29         let elementArray = [];
  30         const playingHuman = (this.mode == "human");
  31         const playingComp = (this.mode == "computer");
  32         let actionArray = [
  33             h('button',
  34                 {
  35                     on: { click: this.clickGameSeek },
  36                     attrs: { "aria-label": 'New game VS human' },
  37                     'class': {
  38                         "tooltip": true,
  39                         "bottom": true, //display below
  40                         "seek": this.seek,
  41                         "playing": playingHuman,
  42                     },
  43                 },
  44                 [h('i', { 'class': { "material-icons": true } }, "accessibility")]),
  45             h('button',
  46                 {
  47                     on: { click: this.clickComputerGame },
  48                     attrs: { "aria-label": 'New game VS computer' },
  49                     'class': {
  50                         "tooltip":true,
  51                         "bottom": true,
  52                         "playing": playingComp,
  53                     },
  54                 },
  55                 [h('i', { 'class': { "material-icons": true } }, "computer")])
  56         ];
  57         if (!!this.vr)
  58         {
  59             const square00 = document.getElementById("sq-0-0");
  60             const squareWidth = !!square00
  61                 ? parseFloat(window.getComputedStyle(square00).width.slice(0,-2))
  62                 : 0;
  63             const indicWidth = (squareWidth>0 ? squareWidth/2 : 20);
  64             if (this.mode == "human")
  65             {
  66                 let connectedIndic = h(
  67                     'div',
  68                     {
  69                         "class": {
  70                             "topindicator": true,
  71                             "indic-left": true,
  72                             "connected": this.oppConnected,
  73                             "disconnected": !this.oppConnected,
  74                         },
  75                         style: {
  76                             "width": indicWidth + "px",
  77                             "height": indicWidth + "px",
  78                         },
  79                     }
  80                 );
  81                 elementArray.push(connectedIndic);
  82             }
  83             let turnIndic = h(
  84                 'div',
  85                 {
  86                     "class": {
  87                         "topindicator": true,
  88                         "indic-right": true,
  89                         "white-turn": this.vr.turn=="w",
  90                         "black-turn": this.vr.turn=="b",
  91                     },
  92                     style: {
  93                         "width": indicWidth + "px",
  94                         "height": indicWidth + "px",
  95                     },
  96                 }
  97             );
  98             elementArray.push(turnIndic);
  99             let choices = h('div',
 100                 {
 101                     attrs: { "id": "choices" },
 102                     'class': { 'row': true },
 103                     style: {
 104                         "display": this.choices.length>0?"block":"none",
 105                         "top": "-" + ((sizeY/2)*squareWidth+squareWidth/2) + "px",
 106                         "width": (this.choices.length * squareWidth) + "px",
 107                         "height": squareWidth + "px",
 108                     },
 109                 },
 110                 this.choices.map( m => { //a "choice" is a move
 111                     return h('div',
 112                         {
 113                             'class': { 'board': true },
 114                             style: {
 115                                 'width': (100/this.choices.length) + "%",
 116                                 'padding-bottom': (100/this.choices.length) + "%",
 117                             },
 118                         },
 119                         [h('img',
 120                             {
 121                                 attrs: { "src": '/images/pieces/' + VariantRules.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
 122                                 'class': { 'choice-piece': true, 'board': true },
 123                                 on: { "click": e => { this.play(m); this.choices=[]; } },
 124                             })
 125                         ]
 126                     );
 127                 })
 128             );
 129             // Create board element (+ reserves if needed by variant or mode)
 130             let gameDiv = h('div',
 131                 {
 132                     'class': { 'game': true },
 133                 },
 134                 [_.range(sizeX).map(i => {
 135                     let ci = this.mycolor=='w' ? i : sizeX-i-1;
 136                     return h(
 137                         'div',
 138                         {
 139                             'class': {
 140                                 'row': true,
 141                             },
 142                             style: { 'opacity': this.choices.length>0?"0.5":"1" },
 143                         },
 144                         _.range(sizeY).map(j => {
 145                             let cj = this.mycolor=='w' ? j : sizeY-j-1;
 146                             let elems = [];
 147                             if (this.vr.board[ci][cj] != VariantRules.EMPTY)
 148                             {
 149                                 elems.push(
 150                                     h(
 151                                         'img',
 152                                         {
 153                                             'class': {
 154                                                 'piece': true,
 155                                                 'ghost': !!this.selectedPiece && this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
 156                                             },
 157                                             attrs: {
 158                                                 src: "/images/pieces/" + VariantRules.getPpath(this.vr.board[ci][cj]) + ".svg",
 159                                             },
 160                                         }
 161                                     )
 162                                 );
 163                             }
 164                             if (hintSquares[ci][cj])
 165                             {
 166                                 elems.push(
 167                                     h(
 168                                         'img',
 169                                         {
 170                                             'class': {
 171                                                 'mark-square': true,
 172                                             },
 173                                             attrs: {
 174                                                 src: "/images/mark.svg",
 175                                             },
 176                                         }
 177                                     )
 178                                 );
 179                             }
 180                             const lm = this.vr.lastMove;
 181                             const highlight = !!lm && _.isMatch(lm.end, {x:ci,y:cj});
 182                             return h(
 183                                 'div',
 184                                 {
 185                                     'class': {
 186                                         'board': true,
 187                                         'light-square': !highlight && (i+j)%2==0,
 188                                         'dark-square': !highlight && (i+j)%2==1,
 189                                         'highlight': highlight,
 190                                         'incheck': incheckSq[ci][cj],
 191                                     },
 192                                     attrs: {
 193                                         id: this.getSquareId({x:ci,y:cj}),
 194                                     },
 195                                 },
 196                                 elems
 197                             );
 198                         })
 199                     );
 200                 }), choices]
 201             );
 202             actionArray.push(
 203                 h('button',
 204                     {
 205                         on: { click: this.resign },
 206                         attrs: { "aria-label": 'Resign' },
 207                         'class': {
 208                             "tooltip":true,
 209                             "bottom": true,
 210                         },
 211                     },
 212                     [h('i', { 'class': { "material-icons": true } }, "flag")])
 213             );
 214             elementArray.push(gameDiv);
 215     //          if (!!vr.reserve)
 216     //          {
 217     //              let reserve = h('div',
 218     //                  {'class':{'game':true}}, [
 219     //                      h('div',
 220     //                          { 'class': { 'row': true }},
 221     //                          [
 222     //                              h('div',
 223     //                                  {'class':{'board':true}},
 224     //                                  [h('img',{'class':{"piece":true},attrs:{"src":"/images/pieces/wb.svg"}})]
 225     //                              )
 226     //                          ]
 227     //                      )
 228     //                  ],
 229     //              );
 230     //              elementArray.push(reserve);
 231     //          }
 232             const eogMessage = this.getEndgameMessage(this.score);
 233             const modalEog = [
 234                 h('input',
 235                     {
 236                         attrs: { "id": "modal-eog", type: "checkbox" },
 237                         "class": { "modal": true },
 238                     }),
 239                 h('div',
 240                     {
 241                         attrs: { "role": "dialog", "aria-labelledby": "dialog-title" },
 242                     },
 243                     [
 244                         h('div',
 245                             {
 246                                 "class": { "card": true, "smallpad": true },
 247                             },
 248                             [
 249                                 h('label',
 250                                     {
 251                                         attrs: { "for": "modal-eog" },
 252                                         "class": { "modal-close": true },
 253                                     }
 254                                 ),
 255                                 h('h3',
 256                                     {
 257                                         "class": { "section": true },
 258                                         domProps: { innerHTML: eogMessage },
 259                                     }
 260                                 )
 261                             ]
 262                         )
 263                     ]
 264                 )
 265             ];
 266             elementArray = elementArray.concat(modalEog);
 267         }
 268         const modalNewgame = [
 269             h('input',
 270                 {
 271                     attrs: { "id": "modal-newgame", type: "checkbox" },
 272                     "class": { "modal": true },
 273                 }),
 274             h('div',
 275                 {
 276                     attrs: { "role": "dialog", "aria-labelledby": "dialog-title" },
 277                 },
 278                 [
 279                     h('div',
 280                         {
 281                             "class": { "card": true, "smallpad": true },
 282                         },
 283                         [
 284                             h('label',
 285                                 {
 286                                     attrs: { "id": "close-newgame", "for": "modal-newgame" },
 287                                     "class": { "modal-close": true },
 288                                 }
 289                             ),
 290                             h('h3',
 291                                 {
 292                                     "class": { "section": true },
 293                                     domProps: { innerHTML: "New game" },
 294                                 }
 295                             ),
 296                             h('p',
 297                                 {
 298                                     "class": { "section": true },
 299                                     domProps: { innerHTML: "Waiting for opponent..." },
 300                                 }
 301                             )
 302                         ]
 303                     )
 304                 ]
 305             )
 306         ];
 307         elementArray = elementArray.concat(modalNewgame);
 308         const actions = h('div',
 309             {
 310                 attrs: { "id": "actions" },
 311                 'class': { 'text-center': true },
 312             },
 313             actionArray
 314         );
 315         elementArray.push(actions);
 316         if (this.score != "*")
 317         {
 318             elementArray.push(
 319                 h('div',
 320                     { },
 321                     [
 322                         h('p',
 323                             {
 324                                 domProps: {
 325                                     innerHTML: this.vr.getPGN(this.mycolor, this.score, this.fenStart, this.mode)
 326                                 }
 327                             }
 328                         )
 329                     ]
 330                 )
 331             );
 332         }
 333         return h(
 334             'div',
 335             {
 336                 'class': {
 337                     "col-sm-12":true,
 338                     "col-md-8":true,
 339                     "col-md-offset-2":true,
 340                     "col-lg-6":true,
 341                     "col-lg-offset-3":true,
 342                 },
 343                 // NOTE: click = mousedown + mouseup --> what about smartphone?!
 344                 on: {
 345                     mousedown: this.mousedown,
 346                     mousemove: this.mousemove,
 347                     mouseup: this.mouseup,
 348                     touchdown: this.mousedown,
 349                     touchmove: this.mousemove,
 350                     touchup: this.mouseup,
 351                 },
 352             },
 353             elementArray
 354         );
 355     },
 356     created: function() {
 357         const url = socketUrl;
 358         const continuation = (localStorage.getItem("variant") === variant);
 359         this.myid = continuation
 360             ? localStorage.getItem("myid")
 361             // random enough (TODO: function)
 362             : (Date.now().toString(36) + Math.random().toString(36).substr(2, 7)).toUpperCase();
 363         this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 364         const socketOpenListener = () => {
 365             if (continuation)
 366             {
 367                 const fen = localStorage.getItem("fen");
 368                 const mycolor = localStorage.getItem("mycolor");
 369                 const oppid = localStorage.getItem("oppid");
 370                 const moves = JSON.parse(localStorage.getItem("moves"));
 371                 this.newGame("human", fen, mycolor, oppid, moves, true);
 372                 // Send ping to server (answer pong if opponent is connected)
 373                 this.conn.send(JSON.stringify({code:"ping",oppid:this.oppid}));
 374             }
 375             else if (localStorage.getItem("newgame") === variant)
 376             {
 377                 // New game request has been cancelled on disconnect
 378                 this.seek = true;
 379                 this.newGame("human", undefined, undefined, undefined, undefined, "reconnect");
 380             }
 381         };
 382         const socketMessageListener = msg => {
 383             const data = JSON.parse(msg.data);
 384             console.log("Receive message: " + data.code);
 385             switch (data.code)
 386             {
 387                 case "newgame": //opponent found
 388                     this.newGame("human", data.fen, data.color, data.oppid); //oppid: opponent socket ID
 389                     break;
 390                 case "newmove": //..he played!
 391                     this.play(data.move, "animate");
 392                     break;
 393                 case "pong": //received if we sent a ping (game still alive on our side)
 394                     this.oppConnected = true;
 395                     const L = this.vr.moves.length;
 396                     // Send our "last state" informations to opponent
 397                     this.conn.send(JSON.stringify({
 398                         code:"lastate",
 399                         oppid:this.oppid,
 400                         lastMove:L>0?this.vr.moves[L-1]:undefined,
 401                         movesCount:L,
 402                     }));
 403                     break;
 404                 case "lastate": //got opponent infos about last move (we might have resigned)
 405                     if (this.mode!="human" || this.oppid!=data.oppid)
 406                     {
 407                         // OK, we resigned
 408                         this.conn.send(JSON.stringify({
 409                             code:"lastate",
 410                             oppid:this.oppid,
 411                             lastMove:undefined,
 412                             movesCount:-1,
 413                         }));
 414                     }
 415                     else if (data.movesCount < 0)
 416                     {
 417                         // OK, he resigned
 418                         this.endGame(this.mycolor=="w"?"1-0":"0-1");
 419                     }
 420                     else if (data.movesCount < this.vr.moves.length)
 421                     {
 422                         // We must tell last move to opponent
 423                         const L = this.vr.moves.length;
 424                         this.conn.send(JSON.stringify({
 425                             code:"lastate",
 426                             oppid:this.oppid,
 427                             lastMove:this.vr.moves[L-1],
 428                             movesCount:L,
 429                         }));
 430                     }
 431                     else if (data.movesCount > this.vr.moves.length) //just got last move from him
 432                         this.play(data.lastMove, "animate");
 433                     break;
 434                 case "resign": //..you won!
 435                     this.endGame(this.mycolor=="w"?"1-0":"0-1");
 436                     break;
 437                 // TODO: also use (dis)connect info to count online players?
 438                 case "connect":
 439                 case "disconnect":
 440                     if (this.mode == "human" && this.oppid == data.id)
 441                         this.oppConnected = (data.code == "connect");
 442                     break;
 443             }
 444         };
 445         const socketCloseListener = () => {
 446             this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 447             this.conn.addEventListener('open', socketOpenListener);
 448             this.conn.addEventListener('message', socketMessageListener);
 449             this.conn.addEventListener('close', socketCloseListener);
 450         };
 451         this.conn.onopen = socketOpenListener;
 452         this.conn.onmessage = socketMessageListener;
 453         this.conn.onclose = socketCloseListener;
 454     },
 455     methods: {
 456         endGame: function(score) {
 457             this.score = score;
 458             let modalBox = document.getElementById("modal-eog");
 459             modalBox.checked = true;
 460             setTimeout(() => { modalBox.checked = false; }, 2000);
 461             if (this.mode == "human")
 462                 this.clearStorage();
 463             this.mode = "idle";
 464             this.oppid = "";
 465         },
 466         getEndgameMessage: function(score) {
 467             let eogMessage = "Unfinished";
 468             switch (this.score)
 469             {
 470                 case "1-0":
 471                     eogMessage = "White win";
 472                     break;
 473                 case "0-1":
 474                     eogMessage = "Black win";
 475                     break;
 476                 case "1/2":
 477                     eogMessage = "Draw";
 478                     break;
 479             }
 480             return eogMessage;
 481         },
 482         resign: function() {
 483             if (this.mode == "human" && this.oppConnected)
 484             {
 485                 try {
 486                     this.conn.send(JSON.stringify({code: "resign", oppid: this.oppid}));
 487                 } catch (INVALID_STATE_ERR) {
 488                     return; //socket is not ready (and not yet reconnected)
 489                 }
 490             }
 491             this.endGame(this.mycolor=="w"?"0-1":"1-0");
 492         },
 493         setStorage: function() {
 494             localStorage.setItem("myid", this.myid);
 495             localStorage.setItem("variant", variant);
 496             localStorage.setItem("mycolor", this.mycolor);
 497             localStorage.setItem("oppid", this.oppid);
 498             localStorage.setItem("fenStart", this.fenStart);
 499             localStorage.setItem("moves", JSON.stringify(this.vr.moves));
 500             localStorage.setItem("fen", this.vr.getFen());
 501         },
 502         updateStorage: function() {
 503             localStorage.setItem("moves", JSON.stringify(this.vr.moves));
 504             localStorage.setItem("fen", this.vr.getFen());
 505         },
 506         clearStorage: function() {
 507             delete localStorage["variant"];
 508             delete localStorage["myid"];
 509             delete localStorage["mycolor"];
 510             delete localStorage["oppid"];
 511             delete localStorage["fenStart"];
 512             delete localStorage["fen"];
 513             delete localStorage["moves"];
 514         },
 515         clickGameSeek: function() {
 516             if (this.mode == "human")
 517                 return; //no newgame while playing
 518             if (this.seek)
 519             {
 520                 delete localStorage["newgame"]; //cancel game seek
 521                 this.seek = false;
 522             }
 523             else
 524                 this.newGame("human");
 525         },
 526         clickComputerGame: function() {
 527             if (this.mode == "human")
 528                 return; //no newgame while playing
 529             this.newGame("computer");
 530         },
 531         newGame: function(mode, fenInit, color, oppId, moves, continuation) {
 532             const fen = fenInit || VariantRules.GenRandInitFen();
 533             console.log(fen); //DEBUG
 534             this.score = "*";
 535             if (mode=="human" && !oppId)
 536             {
 537                 const storageVariant = localStorage.getItem("variant");
 538                 if (!!storageVariant && storageVariant !== variant)
 539                 {
 540                     alert("Finish your " + storageVariant + " game first!");
 541                     return;
 542                 }
 543                 // Send game request and wait..
 544                 localStorage["newgame"] = variant;
 545                 this.seek = true;
 546                 this.clearStorage(); //in case of
 547                 try {
 548                     this.conn.send(JSON.stringify({code:"newgame", fen:fen}));
 549                 } catch (INVALID_STATE_ERR) {
 550                     return; //nothing achieved
 551                 }
 552                 if (continuation !== "reconnect") //TODO: bad HACK...
 553                 {
 554                     let modalBox = document.getElementById("modal-newgame");
 555                     modalBox.checked = true;
 556                     setTimeout(() => { modalBox.checked = false; }, 2000);
 557                 }
 558                 return;
 559             }
 560             this.vr = new VariantRules(fen, moves || []);
 561             this.mode = mode;
 562             this.incheck = []; //in case of
 563             this.fenStart = continuation
 564                 ? localStorage.getItem("fenStart")
 565                 : fen.split(" ")[0]; //Only the position matters
 566             if (mode=="human")
 567             {
 568                 // Opponent found!
 569                 if (!continuation)
 570                 {
 571                     // Not playing sound on game continuation:
 572                     new Audio("/sounds/newgame.mp3").play().then(() => {}).catch(err => {});
 573                     document.getElementById("modal-newgame").checked = false;
 574                 }
 575                 this.oppid = oppId;
 576                 this.oppConnected = true;
 577                 this.mycolor = color;
 578                 this.seek = false;
 579                 if (!!moves && moves.length > 0) //imply continuation
 580                 {
 581                     const oppCol = this.vr.turn;
 582                     const lastMove = moves[moves.length-1];
 583                     this.vr.undo(lastMove);
 584                     this.incheck = this.vr.getCheckSquares(lastMove, oppCol);
 585                     this.vr.play(lastMove, "ingame");
 586                 }
 587                 delete localStorage["newgame"];
 588                 this.setStorage(); //in case of interruptions
 589             }
 590             else //against computer
 591             {
 592                 this.mycolor = Math.random() < 0.5 ? 'w' : 'b';
 593                 if (this.mycolor == 'b')
 594                     setTimeout(this.playComputerMove, 500);
 595             }
 596         },
 597         playComputerMove: function() {
 598             const compColor = this.mycolor=='w' ? 'b' : 'w';
 599             const compMove = this.vr.getComputerMove(compColor);
 600             // HACK: avoid selecting elements before they appear on page:
 601             setTimeout(() => this.play(compMove, "animate"), 500);
 602         },
 603         // Get the identifier of a HTML table cell from its numeric coordinates o.x,o.y.
 604         getSquareId: function(o) {
 605             // NOTE: a separator is required to allow any size of board
 606             return  "sq-" + o.x + "-" + o.y;
 607         },
 608         // Inverse function
 609         getSquareFromId: function(id) {
 610             let idParts = id.split('-');
 611             return [parseInt(idParts[1]), parseInt(idParts[2])];
 612         },
 613         mousedown: function(e) {
 614             e = e || window.event;
 615             e.preventDefault(); //disable native drag & drop
 616             if (!this.selectedPiece && e.target.classList.contains("piece"))
 617             {
 618                 // Next few lines to center the piece on mouse cursor
 619                 let rect = e.target.parentNode.getBoundingClientRect();
 620                 this.start = {
 621                     x: rect.x + rect.width/2,
 622                     y: rect.y + rect.width/2,
 623                     id: e.target.parentNode.id
 624                 };
 625                 this.selectedPiece = e.target.cloneNode();
 626                 this.selectedPiece.style.position = "absolute";
 627                 this.selectedPiece.style.top = 0;
 628                 this.selectedPiece.style.display = "inline-block";
 629                 this.selectedPiece.style.zIndex = 3000;
 630                 let startSquare = this.getSquareFromId(e.target.parentNode.id);
 631                 this.possibleMoves = this.vr.canIplay(this.mycolor,startSquare)
 632                     ? this.vr.getPossibleMovesFrom(startSquare)
 633                     : [];
 634                 e.target.parentNode.appendChild(this.selectedPiece);
 635             }
 636         },
 637         mousemove: function(e) {
 638             if (!this.selectedPiece)
 639                 return;
 640             e = e || window.event;
 641             // If there is an active element, move it around
 642             if (!!this.selectedPiece)
 643             {
 644                 this.selectedPiece.style.left = (e.clientX-this.start.x) + "px";
 645                 this.selectedPiece.style.top = (e.clientY-this.start.y) + "px";
 646             }
 647         },
 648         mouseup: function(e) {
 649             if (!this.selectedPiece)
 650                 return;
 651             e = e || window.event;
 652             // Read drop target (or parentElement, parentNode... if type == "img")
 653             this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coordinates
 654             let landing = document.elementFromPoint(e.clientX, e.clientY);
 655             this.selectedPiece.style.zIndex = 3000;
 656             while (landing.tagName == "IMG") //classList.contains(piece) fails because of mark/highlight
 657                 landing = landing.parentNode;
 658             if (this.start.id == landing.id) //a click: selectedPiece and possibleMoves already filled
 659                 return;
 660             // OK: process move attempt
 661             let endSquare = this.getSquareFromId(landing.id);
 662             let moves = this.findMatchingMoves(endSquare);
 663             this.possibleMoves = [];
 664             if (moves.length > 1)
 665                 this.choices = moves;
 666             else if (moves.length==1)
 667                 this.play(moves[0]);
 668             // Else: impossible move
 669             this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 670             delete this.selectedPiece;
 671             this.selectedPiece = null;
 672         },
 673         findMatchingMoves: function(endSquare) {
 674             // Run through moves list and return the matching set (if promotions...)
 675             let moves = [];
 676             this.possibleMoves.forEach(function(m) {
 677                 if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
 678                     moves.push(m);
 679             });
 680             return moves;
 681         },
 682         animateMove: function(move) {
 683             let startSquare = document.getElementById(this.getSquareId(move.start));
 684             let endSquare = document.getElementById(this.getSquareId(move.end));
 685             let rectStart = startSquare.getBoundingClientRect();
 686             let rectEnd = endSquare.getBoundingClientRect();
 687             let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
 688             let movingPiece = document.querySelector("#" + this.getSquareId(move.start) + " > img.piece");
 689             // HACK for animation (otherwise with positive translate, image slides "under background"...)
 690             // Possible improvement: just alter squares on the piece's way...
 691             squares = document.getElementsByClassName("board");
 692             for (let i=0; i<squares.length; i++)
 693             {
 694                 let square = squares.item(i);
 695                 if (square.id != this.getSquareId(move.start))
 696                     square.style.zIndex = "-1";
 697             }
 698             movingPiece.style.transform = "translate(" + translation.x + "px," + translation.y + "px)";
 699             movingPiece.style.transitionDuration = "0.2s";
 700             movingPiece.style.zIndex = "3000";
 701             setTimeout( () => {
 702                 for (let i=0; i<squares.length; i++)
 703                     squares.item(i).style.zIndex = "auto";
 704                 movingPiece.style = {}; //required e.g. for 0-0 with KR swap
 705                 this.play(move);
 706             }, 200);
 707         },
 708         play: function(move, programmatic) {
 709             if (!!programmatic) //computer or human opponent
 710             {
 711                 this.animateMove(move);
 712                 return;
 713             }
 714             const oppCol = this.vr.getOppCol(this.vr.turn);
 715             this.incheck = this.vr.getCheckSquares(move, oppCol); //is opponent in check?
 716             // Not programmatic, or animation is over
 717             if (this.mode == "human" && this.vr.turn == this.mycolor)
 718                 this.conn.send(JSON.stringify({code:"newmove", move:move, oppid:this.oppid}));
 719             new Audio("/sounds/chessmove1.mp3").play().then(() => {}).catch(err => {});
 720             this.vr.play(move, "ingame");
 721             if (this.mode == "human")
 722                 this.updateStorage(); //after our moves and opponent moves
 723             const eog = this.vr.checkGameOver(this.vr.turn);
 724             if (eog != "*")
 725                 this.endGame(eog);
 726             else if (this.mode == "computer" && this.vr.turn != this.mycolor)
 727                 setTimeout(this.playComputerMove, 500);
 728         },
 729     },
 730 })