client/src/components/Board.vue

   1 <script>
   2 import { getSquareId, getSquareFromId } from "@/utils/squareId";
   3 import { ArrayFun } from "@/utils/array";
   4 import { store } from "@/store";
   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","incheck","orientation","userColor","vname"],
  11   data: function () {
  12     return {
  13       possibleMoves: [], //filled after each valid click/dragstart
  14       choices: [], //promotion pieces, or checkered captures... (as moves)
  15       selectedPiece: null, //moving piece (or clicked piece)
  16       start: {}, //pixels coordinates + id of starting square (click or drag)
  17       settings: store.state.settings,
  18     };
  19   },
  20   render(h) {
  21     if (!this.vr)
  22     {
  23       // Return empty div of class 'game' to avoid error when setting size
  24       return h("div",
  25         {
  26           "class": {
  27             "game": true,
  28           },
  29         });
  30     }
  31     const [sizeX,sizeY] = [V.size.x,V.size.y];
  32     // Precompute hints squares to facilitate rendering
  33     let hintSquares = ArrayFun.init(sizeX, sizeY, false);
  34     this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
  35     // Also precompute in-check squares
  36     let incheckSq = ArrayFun.init(sizeX, sizeY, false);
  37     this.incheck.forEach(sq => { incheckSq[sq[0]][sq[1]] = true; });
  38
  39     let boardElt = document.querySelector(".game");
  40     const squareWidth = (!!boardElt
  41       ? boardElt.offsetWidth / sizeY
  42       : 40); //arbitrary value (not relevant)
  43     const offset = (!!boardElt
  44       ? [boardElt.offsetTop, boardElt.offsetLeft]
  45       : [0, 0]);
  46     const choices = h(
  47       'div',
  48       {
  49         attrs: { "id": "choices" },
  50         'class': { 'row': true },
  51         style: {
  52           "display": (this.choices.length > 0 ? "block" : "none"),
  53           "top": (offset[0] + (sizeY/2)*squareWidth-squareWidth/2) + "px",
  54           "left": (offset[1] + squareWidth*(sizeY - this.choices.length)/2) + "px",
  55           "width": (this.choices.length * squareWidth) + "px",
  56           "height": squareWidth + "px",
  57         },
  58       },
  59       this.choices.map(m => { //a "choice" is a move
  60         return h('div',
  61           {
  62             'class': {
  63               'board': true,
  64               ['board'+sizeY]: true,
  65             },
  66             style: {
  67               'width': (100/this.choices.length) + "%",
  68               'padding-bottom': (100/this.choices.length) + "%",
  69             },
  70           },
  71           [h('img',
  72             {
  73               attrs: { "src": '/images/pieces/' +
  74                 V.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
  75               'class': { 'choice-piece': true },
  76               on: {
  77                 "click": 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.settings.highlight && 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.settings.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.settings.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     let onEvents = {};
 248     // NOTE: click = mousedown + mouseup
 249     if ('ontouchstart' in window)
 250     {
 251       onEvents = {
 252         on: {
 253           touchstart: this.mousedown,
 254           touchmove: this.mousemove,
 255           touchend: this.mouseup,
 256         },
 257       };
 258     }
 259     else
 260     {
 261       onEvents = {
 262         on: {
 263           mousedown: this.mousedown,
 264           mousemove: this.mousemove,
 265           mouseup: this.mouseup,
 266         },
 267       };
 268     }
 269     return h(
 270       'div',
 271       onEvents,
 272       elementArray
 273     );
 274   },
 275   methods: {
 276     mousedown: function(e) {
 277       e = e || window.event;
 278       let ingame = false;
 279       let elem = e.target;
 280       while (!ingame && elem !== null)
 281       {
 282         if (elem.classList.contains("game"))
 283         {
 284           ingame = true;
 285           break;
 286         }
 287         elem = elem.parentElement;
 288       }
 289       if (!ingame) //let default behavior (click on button...)
 290         return;
 291       e.preventDefault(); //disable native drag & drop
 292       if (!this.selectedPiece && e.target.classList.contains("piece"))
 293       {
 294         let parent = e.target.parentNode;
 295         // Next few lines to center the piece on mouse cursor
 296         let rect = parent.getBoundingClientRect();
 297         this.start = {
 298           x: rect.x + rect.width/2,
 299           y: rect.y + rect.width/2,
 300           id: parent.id
 301         };
 302         this.selectedPiece = e.target.cloneNode();
 303         let spStyle = this.selectedPiece.style
 304         spStyle.position = "absolute";
 305         spStyle.top = 0;
 306         spStyle.display = "inline-block";
 307         spStyle.zIndex = 3000;
 308         const startSquare = getSquareFromId(parent.id);
 309         this.possibleMoves = [];
 310         const color = (this.analyze ? this.vr.turn : this.userColor);
 311         if (this.vr.canIplay(color,startSquare))
 312           this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 313         // Next line add moving piece just after current image
 314         // (required for Crazyhouse reserve)
 315         parent.insertBefore(this.selectedPiece, e.target.nextSibling);
 316       }
 317     },
 318     mousemove: function(e) {
 319       if (!this.selectedPiece)
 320         return;
 321       e = e || window.event;
 322       // If there is an active element, move it around
 323       if (!!this.selectedPiece)
 324       {
 325         const [offsetX,offsetY] = !!e.clientX
 326           ? [e.clientX,e.clientY] //desktop browser
 327           : [e.changedTouches[0].pageX, e.changedTouches[0].pageY]; //smartphone
 328         this.selectedPiece.style.left = (offsetX-this.start.x) + "px";
 329         this.selectedPiece.style.top = (offsetY-this.start.y) + "px";
 330       }
 331     },
 332     mouseup: function(e) {
 333       if (!this.selectedPiece)
 334         return;
 335       e = e || window.event;
 336       this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coords
 337       const [offsetX,offsetY] = !!e.clientX
 338         ? [e.clientX,e.clientY]
 339         : [e.changedTouches[0].pageX, e.changedTouches[0].pageY];
 340       let landing = document.elementFromPoint(offsetX, offsetY);
 341       this.selectedPiece.style.zIndex = 3000;
 342       // Next condition: classList.contains(piece) fails because of marks
 343       while (landing.tagName == "IMG")
 344         landing = landing.parentNode;
 345       if (this.start.id == landing.id)
 346       {
 347         // A click: selectedPiece and possibleMoves are already filled
 348         return;
 349       }
 350       // OK: process move attempt, landing is a square node
 351       let endSquare = getSquareFromId(landing.id);
 352       let moves = this.findMatchingMoves(endSquare);
 353       this.possibleMoves = [];
 354       if (moves.length > 1)
 355         this.choices = moves;
 356       else if (moves.length==1)
 357         this.play(moves[0]);
 358       // Else: impossible move
 359       this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 360       delete this.selectedPiece;
 361       this.selectedPiece = null;
 362     },
 363     findMatchingMoves: function(endSquare) {
 364       // Run through moves list and return the matching set (if promotions...)
 365       let moves = [];
 366       this.possibleMoves.forEach(function(m) {
 367         if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
 368           moves.push(m);
 369       });
 370       return moves;
 371     },
 372     play: function(move) {
 373       this.$emit('play-move', move);
 374     },
 375   },
 376 };
 377 </script>
 378
 379 <style lang="sass" scoped>
 380 .game.reserve-div
 381   margin-bottom: 18px
 382
 383 .reserve-count
 384   padding-left: 40%
 385
 386 .reserve-row-1
 387   margin-bottom: 15px
 388
 389 // NOTE: no variants with reserve of size != 8
 390
 391 .game
 392   width: 100%
 393   margin: 0
 394   .board
 395     cursor: pointer
 396
 397 #choices
 398   margin: 0
 399   position: absolute
 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.ghost
 414   position: absolute
 415   opacity: 0.4
 416   top: 0
 417
 418 .highlight
 419   background-color: #00cc66 !important
 420
 421 .incheck
 422   background-color: #cc3300 !important
 423
 424 .light-square.lichess
 425   background-color: #f0d9b5;
 426 .dark-square.lichess
 427   background-color: #b58863;
 428
 429 .light-square.chesscom
 430   background-color: #e5e5ca;
 431 .dark-square.chesscom
 432   background-color: #6f8f57;
 433
 434 .light-square.chesstempo
 435   background-color: #fdfdfd;
 436 .dark-square.chesstempo
 437   background-color: #88a0a8;
 438 </style>