public/javascripts/components/game.js

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