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     // Create board element (+ reserves if needed by variant or mode)
  40     const lm = this.lastMove;
  41     const showLight = this.settings.highlight && this.vname != "Dark";
  42     const gameDiv = h(
  43       'div',
  44       {
  45         'class': {
  46           'game': true,
  47           'clearer': true,
  48         },
  49       },
  50       [...Array(sizeX).keys()].map(i => {
  51         let ci = (this.orientation=='w' ? i : sizeX-i-1);
  52         return h(
  53           'div',
  54           {
  55             'class': {
  56               'row': true,
  57             },
  58             style: { 'opacity': this.choices.length>0?"0.5":"1" },
  59           },
  60           [...Array(sizeY).keys()].map(j => {
  61             let cj = (this.orientation=='w' ? j : sizeY-j-1);
  62             let elems = [];
  63             if (this.vr.board[ci][cj] != V.EMPTY && (this.vname!="Dark"
  64               || this.analyze || (!!this.userColor
  65                 && this.vr.enlightened[this.userColor][ci][cj])))
  66             {
  67               elems.push(
  68                 h(
  69                   'img',
  70                   {
  71                     'class': {
  72                       'piece': true,
  73                       'ghost': !!this.selectedPiece
  74                         && this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
  75                     },
  76                     attrs: {
  77                       src: "/images/pieces/" +
  78                         V.getPpath(this.vr.board[ci][cj]) + ".svg",
  79                     },
  80                   }
  81                 )
  82               );
  83             }
  84             if (this.settings.hints && hintSquares[ci][cj])
  85             {
  86               elems.push(
  87                 h(
  88                   'img',
  89                   {
  90                     'class': {
  91                       'mark-square': true,
  92                     },
  93                     attrs: {
  94                       src: "/images/mark.svg",
  95                     },
  96                   }
  97                 )
  98               );
  99             }
 100             return h(
 101               'div',
 102               {
 103                 'class': {
 104                   'board': true,
 105                   ['board'+sizeY]: true,
 106                   'light-square': (i+j)%2==0,
 107                   'dark-square': (i+j)%2==1,
 108                   [this.settings.bcolor]: true,
 109                   'in-shadow': this.vname=="Dark" && !this.analyze
 110                     && (!this.userColor
 111                       || !this.vr.enlightened[this.userColor][ci][cj]),
 112                   'highlight': showLight && !!lm && lm.end.x == ci && lm.end.y == cj,
 113                   'incheck': showLight && incheckSq[ci][cj],
 114                 },
 115                 attrs: {
 116                   id: getSquareId({x:ci,y:cj}),
 117                 },
 118               },
 119               elems
 120             );
 121           })
 122         );
 123       })
 124     );
 125     let elementArray = [gameDiv];
 126     const playingColor = this.userColor || "w"; //default for an observer
 127     if (!!this.vr.reserve)
 128     {
 129       const shiftIdx = (playingColor=="w" ? 0 : 1);
 130       let myReservePiecesArray = [];
 131       for (let i=0; i<V.RESERVE_PIECES.length; i++)
 132       {
 133         myReservePiecesArray.push(h('div',
 134         {
 135           'class': {'board':true, ['board'+sizeY]:true},
 136           attrs: { id: getSquareId({x:sizeX+shiftIdx,y:i}) }
 137         },
 138         [
 139           h('img',
 140           {
 141             'class': {"piece":true, "reserve":true},
 142             attrs: {
 143               "src": "/images/pieces/" +
 144                 this.vr.getReservePpath(playingColor,i) + ".svg",
 145             }
 146           }),
 147           h('sup',
 148             {"class": { "reserve-count": true } },
 149             [ this.vr.reserve[playingColor][V.RESERVE_PIECES[i]] ]
 150           )
 151         ]));
 152       }
 153       let oppReservePiecesArray = [];
 154       const oppCol = V.GetOppCol(playingColor);
 155       for (let i=0; i<V.RESERVE_PIECES.length; i++)
 156       {
 157         oppReservePiecesArray.push(h('div',
 158         {
 159           'class': {'board':true, ['board'+sizeY]:true},
 160           attrs: { id: getSquareId({x:sizeX+(1-shiftIdx),y:i}) }
 161         },
 162         [
 163           h('img',
 164           {
 165             'class': {"piece":true, "reserve":true},
 166             attrs: {
 167               "src": "/images/pieces/" +
 168                 this.vr.getReservePpath(oppCol,i) + ".svg",
 169             }
 170           }),
 171           h('sup',
 172             {"class": { "reserve-count": true } },
 173             [ this.vr.reserve[oppCol][V.RESERVE_PIECES[i]] ]
 174           )
 175         ]));
 176       }
 177       let reserves = h('div',
 178         {
 179           'class':{
 180             'game': true,
 181             "reserve-div": true,
 182           },
 183         },
 184         [
 185           h('div',
 186             {
 187               'class': {
 188                 'row': true,
 189                 "reserve-row-1": true,
 190               },
 191             },
 192             myReservePiecesArray
 193           ),
 194           h('div',
 195             { 'class': { 'row': true }},
 196             oppReservePiecesArray
 197           )
 198         ]
 199       );
 200       elementArray.push(reserves);
 201     }
 202     const boardElt = document.querySelector(".game");
 203     if (this.choices.length > 0 && !!boardElt) //no choices to show at first drawing
 204     {
 205       const squareWidth = boardElt.offsetWidth / sizeY;
 206       const offset = [boardElt.offsetTop, boardElt.offsetLeft];
 207       const choices = h(
 208         'div',
 209         {
 210           attrs: { "id": "choices" },
 211           'class': { 'row': true },
 212           style: {
 213             "top": (offset[0] + (sizeY/2)*squareWidth-squareWidth/2) + "px",
 214             "left": (offset[1] + squareWidth*(sizeY - this.choices.length)/2) + "px",
 215             "width": (this.choices.length * squareWidth) + "px",
 216             "height": squareWidth + "px",
 217           },
 218         },
 219         this.choices.map(m => { //a "choice" is a move
 220           return h('div',
 221             {
 222               'class': {
 223                 'board': true,
 224                 ['board'+sizeY]: true,
 225               },
 226               style: {
 227                 'width': (100/this.choices.length) + "%",
 228                 'padding-bottom': (100/this.choices.length) + "%",
 229               },
 230             },
 231             [h('img',
 232               {
 233                 attrs: { "src": '/images/pieces/' +
 234                   V.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
 235                 'class': { 'choice-piece': true },
 236                 on: {
 237                   "click": e => { this.play(m); this.choices=[]; },
 238                 },
 239               })
 240             ]
 241           );
 242         })
 243       );
 244       elementArray.unshift(choices);
 245     }
 246     let onEvents = {};
 247     // NOTE: click = mousedown + mouseup
 248     if ('ontouchstart' in window)
 249     {
 250       onEvents = {
 251         on: {
 252           touchstart: this.mousedown,
 253           touchmove: this.mousemove,
 254           touchend: this.mouseup,
 255         },
 256       };
 257     }
 258     else
 259     {
 260       onEvents = {
 261         on: {
 262           mousedown: this.mousedown,
 263           mousemove: this.mousemove,
 264           mouseup: this.mouseup,
 265         },
 266       };
 267     }
 268     return h(
 269       'div',
 270       onEvents,
 271       elementArray
 272     );
 273   },
 274   methods: {
 275     mousedown: function(e) {
 276       // Abort if a piece is already being processed, or target is not a piece.
 277       // NOTE: just looking at classList[0] because piece is the first assigned class
 278       if (!!this.selectedPiece || e.target.classList[0] != "piece")
 279         return;
 280       e.preventDefault(); //disable native drag & drop
 281       let parent = e.target.parentNode; //the surrounding square
 282       // Next few lines to center the piece on mouse cursor
 283       let rect = parent.getBoundingClientRect();
 284       this.start = {
 285         x: rect.x + rect.width/2,
 286         y: rect.y + rect.width/2,
 287         id: parent.id,
 288       };
 289       this.selectedPiece = e.target.cloneNode();
 290       let spStyle = this.selectedPiece.style
 291       spStyle.position = "absolute";
 292       spStyle.top = 0;
 293       spStyle.display = "inline-block";
 294       spStyle.zIndex = 3000;
 295       const startSquare = getSquareFromId(parent.id);
 296       this.possibleMoves = [];
 297       const color = (this.analyze ? this.vr.turn : this.userColor);
 298       if (this.vr.canIplay(color,startSquare))
 299         this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 300       // Next line add moving piece just after current image
 301       // (required for Crazyhouse reserve)
 302       parent.insertBefore(this.selectedPiece, e.target.nextSibling);
 303     },
 304     mousemove: function(e) {
 305       if (!this.selectedPiece)
 306         return;
 307       // There is an active element: move it around
 308       const [offsetX,offsetY] = !!e.clientX
 309         ? [e.clientX,e.clientY] //desktop browser
 310         : [e.changedTouches[0].pageX, e.changedTouches[0].pageY]; //smartphone
 311       this.selectedPiece.style.left = (offsetX-this.start.x) + "px";
 312       this.selectedPiece.style.top = (offsetY-this.start.y) + "px";
 313     },
 314     mouseup: function(e) {
 315       if (!this.selectedPiece)
 316         return;
 317       // There is an active element: obtain the move from start and end squares
 318       this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coords
 319       const [offsetX,offsetY] = !!e.clientX
 320         ? [e.clientX,e.clientY]
 321         : [e.changedTouches[0].pageX, e.changedTouches[0].pageY];
 322       let landing = document.elementFromPoint(offsetX, offsetY);
 323       this.selectedPiece.style.zIndex = 3000;
 324       // Next condition: classList.contains(piece) fails because of marks
 325       while (landing.tagName == "IMG")
 326         landing = landing.parentNode;
 327       if (this.start.id == landing.id) //one or multi clicks on same piece
 328         return;
 329       // OK: process move attempt, landing is a square node
 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" scoped>
 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 .game
 371   width: 100%
 372   margin: 0
 373   .board
 374     cursor: pointer
 375
 376 #choices
 377   margin: 0
 378   position: absolute
 379   z-index: 300
 380   overflow-y: inherit
 381   background-color: rgba(0,0,0,0)
 382   img
 383     cursor: pointer
 384     background-color: #e6ee9c
 385     &:hover
 386       background-color: skyblue
 387     &.choice-piece
 388       width: 100%
 389       height: auto
 390       display: block
 391
 392 img.ghost
 393   position: absolute
 394   opacity: 0.4
 395   top: 0
 396
 397 .highlight
 398   background-color: #00cc66 !important
 399
 400 .incheck
 401   background-color: #cc3300 !important
 402
 403 .light-square.lichess
 404   background-color: #f0d9b5;
 405 .dark-square.lichess
 406   background-color: #b58863;
 407
 408 .light-square.chesscom
 409   background-color: #e5e5ca;
 410 .dark-square.chesscom
 411   background-color: #6f8f57;
 412
 413 .light-square.chesstempo
 414   background-color: #fdfdfd;
 415 .dark-square.chesstempo
 416   background-color: #88a0a8;
 417 </style>