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       currentSquare: null,
  18       settings: store.state.settings,
  19     };
  20   },
  21   render(h) {
  22     if (!this.vr)
  23     {
  24       // Return empty div of class 'game' to avoid error when setting size
  25       return h("div",
  26         {
  27           "class": {
  28             "game": true,
  29           },
  30         });
  31     }
  32     const [sizeX,sizeY] = [V.size.x,V.size.y];
  33     // Precompute hints squares to facilitate rendering
  34     let hintSquares = ArrayFun.init(sizeX, sizeY, false);
  35     this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
  36     // Also precompute in-check squares
  37     let incheckSq = ArrayFun.init(sizeX, sizeY, false);
  38     this.incheck.forEach(sq => { incheckSq[sq[0]][sq[1]] = true; });
  39
  40     let boardElt = document.querySelector(".game");
  41     const squareWidth = (!!boardElt
  42       ? boardElt.offsetWidth / sizeY
  43       : 40); //arbitrary value (not relevant)
  44     const offset = (!!boardElt
  45       ? [boardElt.offsetTop, boardElt.offsetLeft]
  46       : [0, 0]);
  47     const choices = h(
  48       'div',
  49       {
  50         attrs: { "id": "choices" },
  51         'class': { 'row': true },
  52         style: {
  53           "display": (this.choices.length > 0 ? "block" : "none"),
  54           "top": (offset[0] + (sizeY/2)*squareWidth-squareWidth/2) + "px",
  55           "left": (offset[1] + squareWidth*(sizeY - this.choices.length)/2) + "px",
  56           "width": (this.choices.length * squareWidth) + "px",
  57           "height": squareWidth + "px",
  58         },
  59       },
  60       this.choices.map(m => { //a "choice" is a move
  61         return h('div',
  62           {
  63             'class': {
  64               'board': true,
  65               ['board'+sizeY]: true,
  66             },
  67             style: {
  68               'width': (100/this.choices.length) + "%",
  69               'padding-bottom': (100/this.choices.length) + "%",
  70             },
  71           },
  72           [h('img',
  73             {
  74               attrs: { "src": '/images/pieces/' +
  75                 V.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
  76               'class': { 'choice-piece': true },
  77               on: {
  78                 "click": e => { this.play(m); this.choices=[]; },
  79                 // NOTE: add 'touchstart' event to fix a problem on smartphones
  80                 "touchstart": e => { this.play(m); this.choices=[]; },
  81               },
  82             })
  83           ]
  84         );
  85       })
  86     );
  87     // Create board element (+ reserves if needed by variant or mode)
  88     const lm = this.lastMove;
  89     const showLight = this.settings.highlight && this.vname != "Dark";
  90     const gameDiv = h(
  91       'div',
  92       {
  93         'class': {
  94           'game': true,
  95           'clearer': true,
  96         },
  97       },
  98       [...Array(sizeX).keys()].map(i => {
  99         let ci = (this.orientation=='w' ? i : sizeX-i-1);
 100         return h(
 101           'div',
 102           {
 103             'class': {
 104               'row': true,
 105             },
 106             style: { 'opacity': this.choices.length>0?"0.5":"1" },
 107           },
 108           [...Array(sizeY).keys()].map(j => {
 109             let cj = (this.orientation=='w' ? j : sizeY-j-1);
 110             let elems = [];
 111             if (this.vr.board[ci][cj] != V.EMPTY && (this.vname!="Dark"
 112               || this.analyze || (!!this.userColor
 113                 && this.vr.enlightened[this.userColor][ci][cj])))
 114             {
 115               elems.push(
 116                 h(
 117                   'img',
 118                   {
 119                     'class': {
 120                       'piece': true,
 121                       'ghost': !!this.selectedPiece
 122                         && this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
 123                     },
 124                     attrs: {
 125                       src: "/images/pieces/" +
 126                         V.getPpath(this.vr.board[ci][cj]) + ".svg",
 127                     },
 128                   }
 129                 )
 130               );
 131             }
 132             if (this.settings.hints && hintSquares[ci][cj])
 133             {
 134               elems.push(
 135                 h(
 136                   'img',
 137                   {
 138                     'class': {
 139                       'mark-square': true,
 140                     },
 141                     attrs: {
 142                       src: "/images/mark.svg",
 143                     },
 144                   }
 145                 )
 146               );
 147             }
 148             return h(
 149               'div',
 150               {
 151                 'class': {
 152                   'board': true,
 153                   ['board'+sizeY]: true,
 154                   'light-square': (i+j)%2==0,
 155                   'dark-square': (i+j)%2==1,
 156                   [this.settings.bcolor]: true,
 157                   'in-shadow': this.vname=="Dark" && !this.analyze
 158                     && (!this.userColor
 159                       || !this.vr.enlightened[this.userColor][ci][cj]),
 160                   'highlight': showLight && !!lm && lm.end.x == ci && lm.end.y == cj,
 161                   'incheck': showLight && incheckSq[ci][cj],
 162                 },
 163                 attrs: {
 164                   id: getSquareId({x:ci,y:cj}),
 165                 },
 166               },
 167               elems
 168             );
 169           })
 170         );
 171       })
 172     );
 173     const playingColor = this.userColor || "w"; //default for an observer
 174     let elementArray = [choices, gameDiv];
 175     if (!!this.vr.reserve)
 176     {
 177       const shiftIdx = (playingColor=="w" ? 0 : 1);
 178       let myReservePiecesArray = [];
 179       for (let i=0; i<V.RESERVE_PIECES.length; i++)
 180       {
 181         myReservePiecesArray.push(h('div',
 182         {
 183           'class': {'board':true, ['board'+sizeY]:true},
 184           attrs: { id: getSquareId({x:sizeX+shiftIdx,y:i}) }
 185         },
 186         [
 187           h('img',
 188           {
 189             'class': {"piece":true, "reserve":true},
 190             attrs: {
 191               "src": "/images/pieces/" +
 192                 this.vr.getReservePpath(playingColor,i) + ".svg",
 193             }
 194           }),
 195           h('sup',
 196             {"class": { "reserve-count": true } },
 197             [ this.vr.reserve[playingColor][V.RESERVE_PIECES[i]] ]
 198           )
 199         ]));
 200       }
 201       let oppReservePiecesArray = [];
 202       const oppCol = V.GetOppCol(playingColor);
 203       for (let i=0; i<V.RESERVE_PIECES.length; i++)
 204       {
 205         oppReservePiecesArray.push(h('div',
 206         {
 207           'class': {'board':true, ['board'+sizeY]:true},
 208           attrs: { id: getSquareId({x:sizeX+(1-shiftIdx),y:i}) }
 209         },
 210         [
 211           h('img',
 212           {
 213             'class': {"piece":true, "reserve":true},
 214             attrs: {
 215               "src": "/images/pieces/" +
 216                 this.vr.getReservePpath(oppCol,i) + ".svg",
 217             }
 218           }),
 219           h('sup',
 220             {"class": { "reserve-count": true } },
 221             [ this.vr.reserve[oppCol][V.RESERVE_PIECES[i]] ]
 222           )
 223         ]));
 224       }
 225       let reserves = h('div',
 226         {
 227           'class':{
 228             'game': true,
 229             "reserve-div": true,
 230           },
 231         },
 232         [
 233           h('div',
 234             {
 235               'class': {
 236                 'row': true,
 237                 "reserve-row-1": true,
 238               },
 239             },
 240             myReservePiecesArray
 241           ),
 242           h('div',
 243             { 'class': { 'row': true }},
 244             oppReservePiecesArray
 245           )
 246         ]
 247       );
 248       elementArray.push(reserves);
 249     }
 250     return h(
 251       'div',
 252       {
 253         // NOTE: click = mousedown + mouseup
 254         on: {
 255           mousedown: this.mousedown,
 256           mousemove: this.mousemove,
 257           mouseup: this.mouseup,
 258           touchstart: this.mousedown,
 259           touchmove: this.mousemove,
 260           touchend: this.mouseup,
 261         },
 262       },
 263       elementArray
 264     );
 265   },
 266   methods: {
 267     mousedown: function(e) {
 268       e = e || window.event;
 269       let ingame = false;
 270       let elem = e.target;
 271       while (!ingame && elem !== null)
 272       {
 273         if (elem.classList.contains("game"))
 274         {
 275           ingame = true;
 276           break;
 277         }
 278         elem = elem.parentElement;
 279       }
 280       if (!ingame) //let default behavior (click on button...)
 281         return;
 282       e.preventDefault(); //disable native drag & drop
 283       if (!this.selectedPiece && e.target.classList.contains("piece"))
 284       {
 285         let parent = e.target.parentNode;
 286         // Mark selected square
 287         this.currentSquare = parent;
 288         this.currentSquare.classList.add("selected");
 289         // Next few lines to center the piece on mouse cursor
 290         let rect = parent.getBoundingClientRect();
 291         this.start = {
 292           x: rect.x + rect.width/2,
 293           y: rect.y + rect.width/2,
 294           id: parent.id
 295         };
 296         this.selectedPiece = e.target.cloneNode();
 297         this.selectedPiece.style.position = "absolute";
 298         this.selectedPiece.style.top = 0;
 299         this.selectedPiece.style.display = "inline-block";
 300         this.selectedPiece.style.zIndex = 3000;
 301         const startSquare = getSquareFromId(parent.id);
 302         this.possibleMoves = [];
 303         const color = (this.analyze ? this.vr.turn : this.userColor);
 304         if (this.vr.canIplay(color,startSquare))
 305           this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 306         // Next line add moving piece just after current image
 307         // (required for Crazyhouse reserve)
 308         parent.insertBefore(this.selectedPiece, e.target.nextSibling);
 309       }
 310     },
 311     mousemove: function(e) {
 312       if (!this.selectedPiece)
 313         return;
 314       e = e || window.event;
 315       // If there is an active element, move it around
 316       if (!!this.selectedPiece)
 317       {
 318         // Mousemove => drag & drop, no need to keep initial square highlighted
 319         if (!!this.currentSquare)
 320         {
 321           this.currentSquare.classList.remove("selected");
 322           this.currentSquare = null;
 323         }
 324         const [offsetX,offsetY] = !!e.clientX
 325           ? [e.clientX,e.clientY] //desktop browser
 326           : [e.changedTouches[0].pageX, e.changedTouches[0].pageY]; //smartphone
 327         this.selectedPiece.style.left = (offsetX-this.start.x) + "px";
 328         this.selectedPiece.style.top = (offsetY-this.start.y) + "px";
 329       }
 330     },
 331     mouseup: function(e) {
 332       if (!this.selectedPiece)
 333         return;
 334       e = e || window.event;
 335       // Read drop target (or iterate parentNode if type == "img")
 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       // Reset initial square color (if not mousemove: smartphone)
 351       if (!!this.currentSquare)
 352       {
 353         this.currentSquare.classList.remove("selected");
 354         this.currentSquare = null;
 355       }
 356       // OK: process move attempt
 357       let endSquare = getSquareFromId(landing.id);
 358       let moves = this.findMatchingMoves(endSquare);
 359       this.possibleMoves = [];
 360       if (moves.length > 1)
 361         this.choices = moves;
 362       else if (moves.length==1)
 363         this.play(moves[0]);
 364       // Else: impossible move
 365       this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 366       delete this.selectedPiece;
 367       this.selectedPiece = null;
 368     },
 369     findMatchingMoves: function(endSquare) {
 370       // Run through moves list and return the matching set (if promotions...)
 371       let moves = [];
 372       this.possibleMoves.forEach(function(m) {
 373         if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
 374           moves.push(m);
 375       });
 376       return moves;
 377     },
 378     play: function(move) {
 379       this.$emit('play-move', move);
 380     },
 381   },
 382 };
 383 </script>
 384
 385 <style lang="sass" scoped>
 386 .game.reserve-div
 387   margin-bottom: 18px
 388
 389 .reserve-count
 390   padding-left: 40%
 391
 392 .reserve-row-1
 393   margin-bottom: 15px
 394
 395 // NOTE: no variants with reserve of size != 8
 396
 397 .game
 398   width: 100%
 399   margin: 0
 400   .board
 401     cursor: pointer
 402
 403 #choices
 404   margin: 0
 405   position: absolute
 406   z-index: 300
 407   overflow-y: inherit
 408   background-color: rgba(0,0,0,0)
 409   img
 410     cursor: pointer
 411     background-color: #e6ee9c
 412     &:hover
 413       background-color: skyblue
 414     &.choice-piece
 415       width: 100%
 416       height: auto
 417       display: block
 418
 419 img.ghost
 420   position: absolute
 421   opacity: 0.4
 422   top: 0
 423
 424 .highlight
 425   background-color: #00cc66 !important
 426
 427 .incheck
 428   background-color: #cc3300 !important
 429
 430 .selected
 431   background-color: #f7acf7 !important
 432
 433 .light-square.lichess
 434   background-color: #f0d9b5;
 435 .dark-square.lichess
 436   background-color: #b58863;
 437
 438 .light-square.chesscom
 439   background-color: #e5e5ca;
 440 .dark-square.chesscom
 441   background-color: #6f8f57;
 442
 443 .light-square.chesstempo
 444   background-color: #fdfdfd;
 445 .dark-square.chesstempo
 446   background-color: #88a0a8;
 447 </style>