client/src/components/Board.vue

   1 <script>
   2 import { getSquareId, getSquareFromId } from "@/utils/squareId";
   3 import { ArrayFun } from "@/utils/array";
   4
   5 export default {
   6   name: 'my-board',
   7   // Last move cannot be guessed from here, and is required to highlight squares
   8   // vr: object to check moves, print board...
   9   // userColor is left undefined for an external observer
  10   props: ["vr","lastMove","analyze","orientation","userColor","vname"],
  11   data: function () {
  12     return {
  13       hints: (!localStorage["hints"] ? true : localStorage["hints"] === "1"),
  14       bcolor: localStorage["bcolor"] || "lichess", //lichess, chesscom or chesstempo
  15       possibleMoves: [], //filled after each valid click/dragstart
  16       choices: [], //promotion pieces, or checkered captures... (as moves)
  17       selectedPiece: null, //moving piece (or clicked piece)
  18       incheck: [],
  19       start: {}, //pixels coordinates + id of starting square (click or drag)
  20     };
  21   },
  22   render(h) {
  23     if (!this.vr)
  24       return;
  25     const [sizeX,sizeY] = [V.size.x,V.size.y];
  26     // Precompute hints squares to facilitate rendering
  27     let hintSquares = ArrayFun.init(sizeX, sizeY, false);
  28     this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
  29     // Also precompute in-check squares
  30     let incheckSq = ArrayFun.init(sizeX, sizeY, false);
  31     this.incheck.forEach(sq => { incheckSq[sq[0]][sq[1]] = true; });
  32
  33     let firstRow = document.querySelector(".game > .row");
  34     const squareWidth = (!!firstRow
  35       ? document.querySelector(".game > .row").offsetWidth / sizeY
  36       : 40); //arbitrary value (not relevant)
  37     const choices = h(
  38       'div',
  39       {
  40         attrs: { "id": "choices" },
  41         'class': { 'row': true },
  42         style: {
  43           "display": (this.choices.length > 0 ? "block" : "none"),
  44           "top": ((sizeY/2)*squareWidth+squareWidth/2) + "px",
  45           "width": (this.choices.length * squareWidth) + "px",
  46           "height": squareWidth + "px",
  47         },
  48       },
  49       this.choices.map(m => { //a "choice" is a move
  50         return h('div',
  51           {
  52             'class': {
  53               'board': true,
  54               ['board'+sizeY]: true,
  55             },
  56             style: {
  57               'width': (100/this.choices.length) + "%",
  58               'padding-bottom': (100/this.choices.length) + "%",
  59             },
  60           },
  61           [h('img',
  62             {
  63               attrs: { "src": '/images/pieces/' +
  64                 V.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
  65               'class': { 'choice-piece': true },
  66               on: {
  67                 "click": e => { this.play(m); this.choices=[]; },
  68                 // NOTE: add 'touchstart' event to fix a problem on smartphones
  69                 "touchstart": e => { this.play(m); this.choices=[]; },
  70               },
  71             })
  72           ]
  73         );
  74       })
  75     );
  76     // Create board element (+ reserves if needed by variant or mode)
  77     const lm = this.lastMove;
  78     const showLight = this.hints && this.vname != "Dark";
  79     const gameDiv = h(
  80       'div',
  81       {
  82         'class': {
  83           'game': true,
  84           'clearer': true,
  85         },
  86       },
  87       [...Array(sizeX).keys()].map(i => {
  88         let ci = (this.orientation=='w' ? i : sizeX-i-1);
  89         return h(
  90           'div',
  91           {
  92             'class': {
  93               'row': true,
  94             },
  95             style: { 'opacity': this.choices.length>0?"0.5":"1" },
  96           },
  97           [...Array(sizeY).keys()].map(j => {
  98             let cj = (this.orientation=='w' ? j : sizeY-j-1);
  99             let elems = [];
 100             if (this.vr.board[ci][cj] != V.EMPTY && (this.vname!="Dark"
 101               || this.analyze || (!!this.userColor
 102                 && this.vr.enlightened[this.userColor][ci][cj])))
 103             {
 104               elems.push(
 105                 h(
 106                   'img',
 107                   {
 108                     'class': {
 109                       'piece': true,
 110                       'ghost': !!this.selectedPiece
 111                         && this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
 112                     },
 113                     attrs: {
 114                       src: "/images/pieces/" +
 115                         V.getPpath(this.vr.board[ci][cj]) + ".svg",
 116                     },
 117                   }
 118                 )
 119               );
 120             }
 121             if (this.hints && hintSquares[ci][cj])
 122             {
 123               elems.push(
 124                 h(
 125                   'img',
 126                   {
 127                     'class': {
 128                       'mark-square': true,
 129                     },
 130                     attrs: {
 131                       src: "/images/mark.svg",
 132                     },
 133                   }
 134                 )
 135               );
 136             }
 137             return h(
 138               'div',
 139               {
 140                 'class': {
 141                   'board': true,
 142                   ['board'+sizeY]: true,
 143                   'light-square': (i+j)%2==0,
 144                   'dark-square': (i+j)%2==1,
 145                   [this.bcolor]: true,
 146                   'in-shadow': this.vname=="Dark" && !this.analyze
 147                     && (!this.userColor
 148                       || !this.vr.enlightened[this.userColor][ci][cj]),
 149                   'highlight': showLight && !!lm && lm.end.x == ci && lm.end.y == cj,
 150                   'incheck': showLight && incheckSq[ci][cj],
 151                 },
 152                 attrs: {
 153                   id: getSquareId({x:ci,y:cj}),
 154                 },
 155               },
 156               elems
 157             );
 158           })
 159         );
 160       })
 161     );
 162     const playingColor = this.userColor || "w"; //default for an observer
 163     let elementArray = [choices, gameDiv];
 164     if (!!this.vr.reserve)
 165     {
 166       const shiftIdx = (playingColor=="w" ? 0 : 1);
 167       let myReservePiecesArray = [];
 168       for (let i=0; i<V.RESERVE_PIECES.length; i++)
 169       {
 170         myReservePiecesArray.push(h('div',
 171         {
 172           'class': {'board':true, ['board'+sizeY]:true},
 173           attrs: { id: getSquareId({x:sizeX+shiftIdx,y:i}) }
 174         },
 175         [
 176           h('img',
 177           {
 178             'class': {"piece":true, "reserve":true},
 179             attrs: {
 180               "src": "/images/pieces/" +
 181                 this.vr.getReservePpath(playingColor,i) + ".svg",
 182             }
 183           }),
 184           h('sup',
 185             {"class": { "reserve-count": true } },
 186             [ this.vr.reserve[playingColor][V.RESERVE_PIECES[i]] ]
 187           )
 188         ]));
 189       }
 190       let oppReservePiecesArray = [];
 191       const oppCol = V.GetOppCol(playingColor);
 192       for (let i=0; i<V.RESERVE_PIECES.length; i++)
 193       {
 194         oppReservePiecesArray.push(h('div',
 195         {
 196           'class': {'board':true, ['board'+sizeY]:true},
 197           attrs: { id: getSquareId({x:sizeX+(1-shiftIdx),y:i}) }
 198         },
 199         [
 200           h('img',
 201           {
 202             'class': {"piece":true, "reserve":true},
 203             attrs: {
 204               "src": "/images/pieces/" +
 205                 this.vr.getReservePpath(oppCol,i) + ".svg",
 206             }
 207           }),
 208           h('sup',
 209             {"class": { "reserve-count": true } },
 210             [ this.vr.reserve[oppCol][V.RESERVE_PIECES[i]] ]
 211           )
 212         ]));
 213       }
 214       let reserves = h('div',
 215         {
 216           'class':{
 217             'game': true,
 218             "reserve-div": true,
 219           },
 220         },
 221         [
 222           h('div',
 223             {
 224               'class': {
 225                 'row': true,
 226                 "reserve-row-1": true,
 227               },
 228             },
 229             myReservePiecesArray
 230           ),
 231           h('div',
 232             { 'class': { 'row': true }},
 233             oppReservePiecesArray
 234           )
 235         ]
 236       );
 237       elementArray.push(reserves);
 238     }
 239     return h(
 240       'div',
 241       {
 242         // NOTE: click = mousedown + mouseup
 243         on: {
 244           mousedown: this.mousedown,
 245           mousemove: this.mousemove,
 246           mouseup: this.mouseup,
 247           touchstart: this.mousedown,
 248           touchmove: this.mousemove,
 249           touchend: this.mouseup,
 250         },
 251       },
 252       elementArray
 253     );
 254   },
 255   methods: {
 256     mousedown: function(e) {
 257       e = e || window.event;
 258       let ingame = false;
 259       let elem = e.target;
 260       while (!ingame && elem !== null)
 261       {
 262         if (elem.classList.contains("game"))
 263         {
 264           ingame = true;
 265           break;
 266         }
 267         elem = elem.parentElement;
 268       }
 269       if (!ingame) //let default behavior (click on button...)
 270         return;
 271       e.preventDefault(); //disable native drag & drop
 272       if (!this.selectedPiece && e.target.classList.contains("piece"))
 273       {
 274         // Next few lines to center the piece on mouse cursor
 275         let rect = e.target.parentNode.getBoundingClientRect();
 276         this.start = {
 277           x: rect.x + rect.width/2,
 278           y: rect.y + rect.width/2,
 279           id: e.target.parentNode.id
 280         };
 281         this.selectedPiece = e.target.cloneNode();
 282         this.selectedPiece.style.position = "absolute";
 283         this.selectedPiece.style.top = 0;
 284         this.selectedPiece.style.display = "inline-block";
 285         this.selectedPiece.style.zIndex = 3000;
 286         const startSquare = getSquareFromId(e.target.parentNode.id);
 287         this.possibleMoves = [];
 288         const color = (this.analyze ? this.vr.turn : this.userColor);
 289         if (this.vr.canIplay(color,startSquare))
 290           this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 291         // Next line add moving piece just after current image
 292         // (required for Crazyhouse reserve)
 293         e.target.parentNode.insertBefore(this.selectedPiece, e.target.nextSibling);
 294       }
 295     },
 296     mousemove: function(e) {
 297       if (!this.selectedPiece)
 298         return;
 299       e = e || window.event;
 300       // If there is an active element, move it around
 301       if (!!this.selectedPiece)
 302       {
 303         const [offsetX,offsetY] = !!e.clientX
 304           ? [e.clientX,e.clientY] //desktop browser
 305           : [e.changedTouches[0].pageX, e.changedTouches[0].pageY]; //smartphone
 306         this.selectedPiece.style.left = (offsetX-this.start.x) + "px";
 307         this.selectedPiece.style.top = (offsetY-this.start.y) + "px";
 308       }
 309     },
 310     mouseup: function(e) {
 311       if (!this.selectedPiece)
 312         return;
 313       e = e || window.event;
 314       // Read drop target (or parentElement, parentNode... if type == "img")
 315       this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coords
 316       const [offsetX,offsetY] = !!e.clientX
 317         ? [e.clientX,e.clientY]
 318         : [e.changedTouches[0].pageX, e.changedTouches[0].pageY];
 319       let landing = document.elementFromPoint(offsetX, offsetY);
 320       this.selectedPiece.style.zIndex = 3000;
 321       // Next condition: classList.contains(piece) fails because of marks
 322       while (landing.tagName == "IMG")
 323         landing = landing.parentNode;
 324       if (this.start.id == landing.id)
 325       {
 326         // A click: selectedPiece and possibleMoves are already filled
 327         return;
 328       }
 329       // OK: process move attempt
 330       let endSquare = getSquareFromId(landing.id);
 331       let moves = this.findMatchingMoves(endSquare);
 332       this.possibleMoves = [];
 333       if (moves.length > 1)
 334         this.choices = moves;
 335       else if (moves.length==1)
 336         this.play(moves[0]);
 337       // Else: impossible move
 338       this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 339       delete this.selectedPiece;
 340       this.selectedPiece = null;
 341     },
 342     findMatchingMoves: function(endSquare) {
 343       // Run through moves list and return the matching set (if promotions...)
 344       let moves = [];
 345       this.possibleMoves.forEach(function(m) {
 346         if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
 347           moves.push(m);
 348       });
 349       return moves;
 350     },
 351     play: function(move) {
 352       this.$emit('play-move', move);
 353     },
 354   },
 355 };
 356 </script>
 357
 358 <style lang="sass">
 359 .game.reserve-div
 360   margin-bottom: 18px
 361
 362 .reserve-count
 363   padding-left: 40%
 364
 365 .reserve-row-1
 366   margin-bottom: 15px
 367
 368 // NOTE: no variants with reserve of size != 8
 369
 370 div.board
 371   float: left
 372   height: 0
 373   display: inline-block
 374   position: relative
 375
 376 div.board8
 377   width: 12.5%
 378   padding-bottom: 12.5%
 379
 380 div.board10
 381   width: 10%
 382   padding-bottom: 10%
 383
 384 div.board11
 385   width: 9.09%
 386   padding-bottom: 9.1%
 387
 388 .game
 389   width: #{'min(80vw, 500px)'}
 390   margin: 0 auto
 391   .board
 392     cursor: pointer
 393   @media screen and (max-width: 767px)
 394     width: 100%
 395     margin: 0
 396
 397 #choices
 398   margin: 0 auto 0 auto
 399   position: relative
 400   z-index: 300
 401   overflow-y: inherit
 402   background-color: rgba(0,0,0,0)
 403   img
 404     cursor: pointer
 405     background-color: #e6ee9c
 406     &:hover
 407       background-color: skyblue
 408     &.choice-piece
 409       width: 100%
 410       height: auto
 411       display: block
 412
 413 img.piece
 414   width: 100%
 415
 416 img.piece, img.mark-square
 417   max-width: 100%
 418   height: auto
 419   display: block
 420
 421 img.mark-square
 422   opacity: 0.6
 423   width: 76%
 424   position: absolute
 425   top: 12%
 426   left: 12%
 427   opacity: .7
 428
 429 img.ghost
 430   position: absolute
 431   opacity: 0.4
 432   top: 0
 433
 434 .highlight
 435   background-color: #00cc66 !important
 436
 437 .in-shadow
 438   filter: brightness(50%)
 439
 440 .incheck
 441   background-color: #cc3300 !important
 442
 443 .light-square.lichess
 444   background-color: #f0d9b5;
 445 .dark-square.lichess
 446   background-color: #b58863;
 447
 448 .light-square.chesscom
 449   background-color: #e5e5ca;
 450 .dark-square.chesscom
 451   background-color: #6f8f57;
 452
 453 .light-square.chesstempo
 454   background-color: #fdfdfd;
 455 .dark-square.chesstempo
 456   background-color: #88a0a8;
 457 </style>