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: [
  11     "vr",
  12     "lastMove",
  13     "analyze",
  14     "score",
  15     "incheck",
  16     "orientation",
  17     "userColor",
  18     "vname"
  19   ],
  20   data: function() {
  21     return {
  22       mobileBrowser: ("ontouchstart" in window),
  23       possibleMoves: [], //filled after each valid click/dragstart
  24       choices: [], //promotion pieces, or checkered captures... (as moves)
  25       selectedPiece: null, //moving piece (or clicked piece)
  26       start: null, //pixels coordinates + id of starting square (click or drag)
  27       click: "",
  28       settings: store.state.settings
  29     };
  30   },
  31   render(h) {
  32     if (!this.vr) {
  33       // Return empty div of class 'game' to avoid error when setting size
  34       return h("div", {
  35         class: {
  36           game: true
  37         }
  38       });
  39     }
  40     const [sizeX, sizeY] = [V.size.x, V.size.y];
  41     // Precompute hints squares to facilitate rendering
  42     let hintSquares = ArrayFun.init(sizeX, sizeY, false);
  43     this.possibleMoves.forEach(m => {
  44       hintSquares[m.end.x][m.end.y] = true;
  45     });
  46     // Also precompute in-check squares
  47     let incheckSq = ArrayFun.init(sizeX, sizeY, false);
  48     this.incheck.forEach(sq => {
  49       incheckSq[sq[0]][sq[1]] = true;
  50     });
  51
  52     const lm = this.lastMove;
  53     const showLight = (
  54       this.settings.highlight &&
  55       ["all","highlight"].includes(V.ShowMoves)
  56     );
  57     const orientation = !V.CanFlip ? "w" : this.orientation;
  58     // Ensure that squares colors do not change when board is flipped
  59     const lightSquareMod = (sizeX + sizeY) % 2;
  60     const showPiece = (x, y) => {
  61       return (
  62         this.vr.board[x][y] != V.EMPTY &&
  63         (!this.vr.enlightened || this.analyze || this.score != "*" ||
  64           (!!this.userColor && this.vr.enlightened[this.userColor][x][y]))
  65       );
  66     };
  67     const inHighlight = (x, y) => {
  68       return showLight && !!lm && (
  69         (lm.end.x == x && lm.end.y == y) ||
  70         (lm.start.x == x && lm.start.y == y));
  71     };
  72     const inShadow = (x, y) => {
  73       return (
  74         !this.analyze &&
  75         this.score == "*" &&
  76         this.vr.enlightened &&
  77         (!this.userColor || !this.vr.enlightened[this.userColor][x][y])
  78       );
  79     };
  80     // Create board element (+ reserves if needed by variant)
  81     let elementArray = [];
  82     const gameDiv = h(
  83       "div",
  84       {
  85         class: {
  86           game: true,
  87           clearer: true
  88         }
  89       },
  90       [...Array(sizeX).keys()].map(i => {
  91         const ci = orientation == "w" ? i : sizeX - i - 1;
  92         return h(
  93           "div",
  94           {
  95             class: {
  96               row: true
  97             },
  98             style: { opacity: this.choices.length > 0 ? "0.5" : "1" }
  99           },
 100           [...Array(sizeY).keys()].map(j => {
 101             const cj = orientation == "w" ? j : sizeY - j - 1;
 102             let elems = [];
 103             if (showPiece(ci, cj)) {
 104               elems.push(
 105                 h("img", {
 106                   class: {
 107                     piece: true,
 108                     ghost:
 109                       !!this.selectedPiece &&
 110                       this.selectedPiece.parentNode.id == "sq-" + ci + "-" + cj
 111                   },
 112                   attrs: {
 113                     src:
 114                       "/images/pieces/" +
 115                       this.vr.getPpath(this.vr.board[ci][cj], this.userColor, this.score) +
 116                       ".svg"
 117                   }
 118                 })
 119               );
 120             }
 121             if (this.settings.hints && hintSquares[ci][cj]) {
 122               elems.push(
 123                 h("img", {
 124                   class: {
 125                     "mark-square": true
 126                   },
 127                   attrs: {
 128                     src: "/images/mark.svg"
 129                   }
 130                 })
 131               );
 132             }
 133             const lightSquare = (ci + cj) % 2 == lightSquareMod;
 134             return h(
 135               "div",
 136               {
 137                 class: {
 138                   board: true,
 139                   ["board" + sizeY]: true,
 140                   "light-square": lightSquare,
 141                   "dark-square": !lightSquare,
 142                   [this.settings.bcolor]: true,
 143                   "in-shadow": inShadow(ci, cj),
 144                   "highlight-light": inHighlight(ci, cj) && lightSquare,
 145                   "highlight-dark": inHighlight(ci, cj) && !lightSquare,
 146                   "incheck-light": showLight && lightSquare && incheckSq[ci][cj],
 147                   "incheck-dark": showLight && !lightSquare && incheckSq[ci][cj]
 148                 },
 149                 attrs: {
 150                   id: getSquareId({ x: ci, y: cj })
 151                 }
 152               },
 153               elems
 154             );
 155           })
 156         );
 157       })
 158     );
 159     if (!!this.vr.reserve) {
 160       const playingColor = this.userColor || "w"; //default for an observer
 161       const shiftIdx = playingColor == "w" ? 0 : 1;
 162       let myReservePiecesArray = [];
 163       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 164         const qty = this.vr.reserve[playingColor][V.RESERVE_PIECES[i]];
 165         myReservePiecesArray.push(
 166           h(
 167             "div",
 168             {
 169               class: { board: true, ["board" + sizeY]: true },
 170               attrs: { id: getSquareId({ x: sizeX + shiftIdx, y: i }) },
 171               style: { opacity: qty > 0 ? 1 : 0.35 }
 172             },
 173             [
 174               h("img", {
 175                 class: { piece: true, reserve: true },
 176                 attrs: {
 177                   src:
 178                     "/images/pieces/" +
 179                     this.vr.getReservePpath(i, playingColor) +
 180                     ".svg"
 181                 }
 182               }),
 183               h("sup", { class: { "reserve-count": true } }, [ qty ])
 184             ]
 185           )
 186         );
 187       }
 188       let oppReservePiecesArray = [];
 189       const oppCol = V.GetOppCol(playingColor);
 190       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 191         const qty = this.vr.reserve[oppCol][V.RESERVE_PIECES[i]];
 192         oppReservePiecesArray.push(
 193           h(
 194             "div",
 195             {
 196               class: { board: true, ["board" + sizeY]: true },
 197               attrs: { id: getSquareId({ x: sizeX + (1 - shiftIdx), y: i }) },
 198               style: { opacity: qty > 0 ? 1 : 0.35 }
 199             },
 200             [
 201               h("img", {
 202                 class: { piece: true, reserve: true },
 203                 attrs: {
 204                   src:
 205                     "/images/pieces/" +
 206                     this.vr.getReservePpath(i, oppCol) +
 207                     ".svg"
 208                 }
 209               }),
 210               h("sup", { class: { "reserve-count": true } }, [ qty ])
 211             ]
 212           )
 213         );
 214       }
 215       const myReserveTop = (
 216         (playingColor == 'w' && orientation == 'b') ||
 217         (playingColor == 'b' && orientation == 'w')
 218       );
 219       // Center reserves, assuming same number of pieces for each side:
 220       const nbReservePieces = myReservePiecesArray.length;
 221       const marginLeft = ((100 - nbReservePieces * (100 / sizeY)) / 2) + "%";
 222       const reserveTop =
 223         h(
 224           "div",
 225           {
 226             class: {
 227               game: true,
 228               "reserve-div": true
 229             },
 230             style: {
 231               "margin-left": marginLeft
 232             }
 233           },
 234           [
 235             h(
 236               "div",
 237               {
 238                 class: {
 239                   row: true,
 240                   "reserve-row": true
 241                 }
 242               },
 243               myReserveTop ? myReservePiecesArray : oppReservePiecesArray
 244             )
 245           ]
 246         );
 247       var reserveBottom =
 248         h(
 249           "div",
 250           {
 251             class: {
 252               game: true,
 253               "reserve-div": true
 254             },
 255             style: {
 256               "margin-left": marginLeft
 257             }
 258           },
 259           [
 260             h(
 261               "div",
 262               {
 263                 class: {
 264                   row: true,
 265                   "reserve-row": true
 266                 }
 267               },
 268               myReserveTop ? oppReservePiecesArray : myReservePiecesArray
 269             )
 270           ]
 271         );
 272       elementArray.push(reserveTop);
 273     }
 274     elementArray.push(gameDiv);
 275     if (!!this.vr.reserve) elementArray.push(reserveBottom);
 276     const boardElt = document.querySelector(".game");
 277     if (this.choices.length > 0 && !!boardElt) {
 278       //no choices to show at first drawing
 279       const squareWidth = boardElt.offsetWidth / sizeY;
 280       const offset = [boardElt.offsetTop, boardElt.offsetLeft];
 281       const choices = h(
 282         "div",
 283         {
 284           attrs: { id: "choices" },
 285           class: { row: true },
 286           style: {
 287             top: offset[0] + (sizeY / 2) * squareWidth - squareWidth / 2 + "px",
 288             left:
 289               offset[1] +
 290               (squareWidth * (sizeY - this.choices.length)) / 2 +
 291               "px",
 292             width: this.choices.length * squareWidth + "px",
 293             height: squareWidth + "px"
 294           }
 295         },
 296         this.choices.map(m => {
 297           //a "choice" is a move
 298           return h(
 299             "div",
 300             {
 301               class: {
 302                 board: true,
 303                 ["board" + sizeY]: true
 304               },
 305               style: {
 306                 width: 100 / this.choices.length + "%",
 307                 "padding-bottom": 100 / this.choices.length + "%"
 308               }
 309             },
 310             [
 311               h("img", {
 312                 attrs: {
 313                   src:
 314                     "/images/pieces/" +
 315                     this.vr.getPpath(m.appear[0].c + m.appear[0].p) +
 316                     ".svg"
 317                 },
 318                 class: { "choice-piece": true },
 319                 on: {
 320                   click: () => {
 321                     this.play(m);
 322                     this.choices = [];
 323                   }
 324                 }
 325               })
 326             ]
 327           );
 328         })
 329       );
 330       elementArray.unshift(choices);
 331     }
 332     let onEvents = {};
 333     // NOTE: click = mousedown + mouseup
 334     if (this.mobileBrowser) {
 335       onEvents = {
 336         on: {
 337           touchstart: this.mousedown,
 338           touchmove: this.mousemove,
 339           touchend: this.mouseup
 340         }
 341       };
 342     } else {
 343       onEvents = {
 344         on: {
 345           mousedown: this.mousedown,
 346           mousemove: this.mousemove,
 347           mouseup: this.mouseup
 348         }
 349       };
 350     }
 351     return h("div", onEvents, elementArray);
 352   },
 353   methods: {
 354     mousedown: function(e) {
 355       e.preventDefault();
 356       if (!this.start) {
 357         // Start square must contain a piece.
 358         // NOTE: classList[0] is enough: 'piece' is the first assigned class
 359         if (e.target.classList[0] != "piece") return;
 360         let parent = e.target.parentNode; //surrounding square
 361         // Show possible moves if current player allowed to play
 362         const startSquare = getSquareFromId(parent.id);
 363         this.possibleMoves = [];
 364         const color = this.analyze ? this.vr.turn : this.userColor;
 365         if (this.vr.canIplay(color, startSquare))
 366           this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 367         // For potential drag'n drop, remember start coordinates
 368         // (to center the piece on mouse cursor)
 369         let rect = parent.getBoundingClientRect();
 370         this.start = {
 371           x: rect.x + rect.width / 2,
 372           y: rect.y + rect.width / 2,
 373           id: parent.id
 374         };
 375         // Add the moving piece to the board, just after current image
 376         this.selectedPiece = e.target.cloneNode();
 377         Object.assign(
 378           this.selectedPiece.style,
 379           {
 380             position: "absolute",
 381             top: 0,
 382             display: "inline-block",
 383             zIndex: 3000
 384           }
 385         );
 386         parent.insertBefore(this.selectedPiece, e.target.nextSibling);
 387       } else {
 388         this.processMoveAttempt(e);
 389       }
 390     },
 391     mousemove: function(e) {
 392       if (!this.selectedPiece) return;
 393       e.preventDefault();
 394       // There is an active element: move it around
 395       const [offsetX, offsetY] =
 396         this.mobileBrowser
 397           ? [e.changedTouches[0].pageX, e.changedTouches[0].pageY]
 398           : [e.clientX, e.clientY];
 399       Object.assign(
 400         this.selectedPiece.style,
 401         {
 402           left: offsetX - this.start.x + "px",
 403           top: offsetY - this.start.y + "px"
 404         }
 405       );
 406     },
 407     mouseup: function(e) {
 408       if (!this.selectedPiece) return;
 409       e.preventDefault();
 410       // Drag'n drop. Selected piece is no longer needed:
 411       this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 412       delete this.selectedPiece;
 413       this.selectedPiece = null;
 414       this.processMoveAttempt(e);
 415     },
 416     processMoveAttempt: function(e) {
 417       // Obtain the move from start and end squares
 418       const [offsetX, offsetY] =
 419         this.mobileBrowser
 420           ? [e.changedTouches[0].pageX, e.changedTouches[0].pageY]
 421           : [e.clientX, e.clientY];
 422       let landing = document.elementFromPoint(offsetX, offsetY);
 423       // Next condition: classList.contains(piece) fails because of marks
 424       while (landing.tagName == "IMG") landing = landing.parentNode;
 425       if (this.start.id == landing.id) {
 426         if (this.click == landing.id) {
 427           // Second click on same square: cancel current move
 428           this.possibleMoves = [];
 429           this.start = null;
 430           this.click = "";
 431         } else this.click = landing.id;
 432         return;
 433       }
 434       this.start = null;
 435       // OK: process move attempt, landing is a square node
 436       let endSquare = getSquareFromId(landing.id);
 437       let moves = this.findMatchingMoves(endSquare);
 438       this.possibleMoves = [];
 439       if (moves.length > 1) this.choices = moves;
 440       else if (moves.length == 1) this.play(moves[0]);
 441       // else: forbidden move attempt
 442     },
 443     findMatchingMoves: function(endSquare) {
 444       // Run through moves list and return the matching set (if promotions...)
 445       return (
 446         this.possibleMoves.filter(m => {
 447           return (endSquare[0] == m.end.x && endSquare[1] == m.end.y);
 448         })
 449       );
 450     },
 451     play: function(move) {
 452       this.$emit("play-move", move);
 453     }
 454   }
 455 };
 456 </script>
 457
 458 <style lang="sass" scoped>
 459 .game.reserve-div
 460   margin-bottom: 18px
 461
 462 .reserve-count
 463   padding-left: 40%
 464
 465 .reserve-row
 466   margin-bottom: 15px
 467
 468 // NOTE: no variants with reserve of size != 8
 469
 470 .game
 471   user-select: none
 472   width: 100%
 473   margin: 0
 474   .board
 475     cursor: pointer
 476
 477 #choices
 478   user-select: none
 479   margin: 0
 480   position: absolute
 481   z-index: 300
 482   overflow-y: inherit
 483   background-color: rgba(0,0,0,0)
 484   img
 485     cursor: pointer
 486     background-color: #e6ee9c
 487     &:hover
 488       background-color: skyblue
 489     &.choice-piece
 490       width: 100%
 491       height: auto
 492       display: block
 493
 494 img.ghost
 495   position: absolute
 496   opacity: 0.5
 497   top: 0
 498
 499 .incheck-light
 500   background-color: rgba(204, 51, 0, 0.7) !important
 501 .incheck-dark
 502   background-color: rgba(204, 51, 0, 0.9) !important
 503
 504 .light-square.lichess
 505   background-color: #f0d9b5;
 506 .dark-square.lichess
 507   background-color: #b58863;
 508
 509 .light-square.chesscom
 510   background-color: #e5e5ca;
 511 .dark-square.chesscom
 512   background-color: #6f8f57;
 513
 514 .light-square.chesstempo
 515   background-color: #dfdfdf;
 516 .dark-square.chesstempo
 517   background-color: #7287b6;
 518
 519 // TODO: no predefined highlight colors, but layers. How?
 520
 521 .light-square.lichess.highlight-light
 522   background-color: #cdd26a !important
 523 .dark-square.lichess.highlight-dark
 524   background-color: #aaa23a !important
 525
 526 .light-square.chesscom.highlight-light
 527   background-color: #f7f783 !important
 528 .dark-square.chesscom.highlight-dark
 529   background-color: #bacb44 !important
 530
 531 .light-square.chesstempo.highlight-light
 532   background-color: #9f9fff !important
 533 .dark-square.chesstempo.highlight-dark
 534   background-color: #557fff !important
 535
 536 </style>