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