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           const applyMove = (e) => {
 299             e.stopPropagation();
 300             this.play(m);
 301             this.choices = [];
 302           };
 303           const onClick =
 304             this.mobileBrowser
 305               ? { touchend: applyMove }
 306               : { mouseup: applyMove };
 307           return h(
 308             "div",
 309             {
 310               class: {
 311                 board: true,
 312                 ["board" + sizeY]: true
 313               },
 314               style: {
 315                 width: 100 / this.choices.length + "%",
 316                 "padding-bottom": 100 / this.choices.length + "%"
 317               }
 318             },
 319             [
 320               h("img", {
 321                 attrs: {
 322                   src:
 323                     "/images/pieces/" +
 324                     this.vr.getPpath(m.appear[0].c + m.appear[0].p) +
 325                     ".svg"
 326                 },
 327                 class: { "choice-piece": true },
 328                 on: onClick
 329               })
 330             ]
 331           );
 332         })
 333       );
 334       elementArray.unshift(choices);
 335     }
 336     let onEvents = {};
 337     // NOTE: click = mousedown + mouseup
 338     if (this.mobileBrowser) {
 339       onEvents = {
 340         on: {
 341           touchstart: this.mousedown,
 342           touchmove: this.mousemove,
 343           touchend: this.mouseup
 344         }
 345       };
 346     } else {
 347       onEvents = {
 348         on: {
 349           mousedown: this.mousedown,
 350           mousemove: this.mousemove,
 351           mouseup: this.mouseup
 352         }
 353       };
 354     }
 355     return h("div", onEvents, elementArray);
 356   },
 357   methods: {
 358     mousedown: function(e) {
 359       e.preventDefault();
 360       if (!this.start) {
 361         // Start square must contain a piece.
 362         // NOTE: classList[0] is enough: 'piece' is the first assigned class
 363         if (e.target.classList[0] != "piece") return;
 364         let parent = e.target.parentNode; //surrounding square
 365         // Show possible moves if current player allowed to play
 366         const startSquare = getSquareFromId(parent.id);
 367         this.possibleMoves = [];
 368         const color = this.analyze ? this.vr.turn : this.userColor;
 369         if (this.vr.canIplay(color, startSquare))
 370           this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 371         // For potential drag'n drop, remember start coordinates
 372         // (to center the piece on mouse cursor)
 373         let rect = parent.getBoundingClientRect();
 374         this.start = {
 375           x: rect.x + rect.width / 2,
 376           y: rect.y + rect.width / 2,
 377           id: parent.id
 378         };
 379         // Add the moving piece to the board, just after current image
 380         this.selectedPiece = e.target.cloneNode();
 381         Object.assign(
 382           this.selectedPiece.style,
 383           {
 384             position: "absolute",
 385             top: 0,
 386             display: "inline-block",
 387             zIndex: 3000
 388           }
 389         );
 390         parent.insertBefore(this.selectedPiece, e.target.nextSibling);
 391       } else {
 392         this.processMoveAttempt(e);
 393       }
 394     },
 395     mousemove: function(e) {
 396       if (!this.selectedPiece) return;
 397       e.preventDefault();
 398       // There is an active element: move it around
 399       const [offsetX, offsetY] =
 400         this.mobileBrowser
 401           ? [e.changedTouches[0].pageX, e.changedTouches[0].pageY]
 402           : [e.clientX, e.clientY];
 403       Object.assign(
 404         this.selectedPiece.style,
 405         {
 406           left: offsetX - this.start.x + "px",
 407           top: offsetY - this.start.y + "px"
 408         }
 409       );
 410     },
 411     mouseup: function(e) {
 412       if (!this.selectedPiece) return;
 413       e.preventDefault();
 414       // Drag'n drop. Selected piece is no longer needed:
 415       this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 416       delete this.selectedPiece;
 417       this.selectedPiece = null;
 418       this.processMoveAttempt(e);
 419     },
 420     processMoveAttempt: function(e) {
 421       // Obtain the move from start and end squares
 422       const [offsetX, offsetY] =
 423         this.mobileBrowser
 424           ? [e.changedTouches[0].pageX, e.changedTouches[0].pageY]
 425           : [e.clientX, e.clientY];
 426       let landing = document.elementFromPoint(offsetX, offsetY);
 427       // Next condition: classList.contains(piece) fails because of marks
 428       while (landing.tagName == "IMG") landing = landing.parentNode;
 429       if (this.start.id == landing.id) {
 430         if (this.click == landing.id) {
 431           // Second click on same square: cancel current move
 432           this.possibleMoves = [];
 433           this.start = null;
 434           this.click = "";
 435         } else this.click = landing.id;
 436         return;
 437       }
 438       this.start = null;
 439       // OK: process move attempt, landing is a square node
 440       let endSquare = getSquareFromId(landing.id);
 441       let moves = this.findMatchingMoves(endSquare);
 442       this.possibleMoves = [];
 443       if (moves.length > 1) this.choices = moves;
 444       else if (moves.length == 1) this.play(moves[0]);
 445       // else: forbidden move attempt
 446     },
 447     findMatchingMoves: function(endSquare) {
 448       // Run through moves list and return the matching set (if promotions...)
 449       return (
 450         this.possibleMoves.filter(m => {
 451           return (endSquare[0] == m.end.x && endSquare[1] == m.end.y);
 452         })
 453       );
 454     },
 455     play: function(move) {
 456       this.$emit("play-move", move);
 457     }
 458   }
 459 };
 460 </script>
 461
 462 <style lang="sass" scoped>
 463 .game.reserve-div
 464   margin-bottom: 18px
 465
 466 .reserve-count
 467   padding-left: 40%
 468
 469 .reserve-row
 470   margin-bottom: 15px
 471
 472 // NOTE: no variants with reserve of size != 8
 473
 474 .game
 475   user-select: none
 476   width: 100%
 477   margin: 0
 478   .board
 479     cursor: pointer
 480
 481 #choices
 482   user-select: none
 483   margin: 0
 484   position: absolute
 485   z-index: 300
 486   overflow-y: inherit
 487   background-color: rgba(0,0,0,0)
 488   img
 489     cursor: pointer
 490     background-color: #e6ee9c
 491     &:hover
 492       background-color: skyblue
 493     &.choice-piece
 494       width: 100%
 495       height: auto
 496       display: block
 497
 498 img.ghost
 499   position: absolute
 500   opacity: 0.5
 501   top: 0
 502
 503 .incheck-light
 504   background-color: rgba(204, 51, 0, 0.7) !important
 505 .incheck-dark
 506   background-color: rgba(204, 51, 0, 0.9) !important
 507
 508 .light-square.lichess
 509   background-color: #f0d9b5;
 510 .dark-square.lichess
 511   background-color: #b58863;
 512
 513 .light-square.chesscom
 514   background-color: #e5e5ca;
 515 .dark-square.chesscom
 516   background-color: #6f8f57;
 517
 518 .light-square.chesstempo
 519   background-color: #dfdfdf;
 520 .dark-square.chesstempo
 521   background-color: #7287b6;
 522
 523 // TODO: no predefined highlight colors, but layers. How?
 524
 525 .light-square.lichess.highlight-light
 526   background-color: #cdd26a !important
 527 .dark-square.lichess.highlight-dark
 528   background-color: #aaa23a !important
 529
 530 .light-square.chesscom.highlight-light
 531   background-color: #f7f783 !important
 532 .dark-square.chesscom.highlight-dark
 533   background-color: #bacb44 !important
 534
 535 .light-square.chesstempo.highlight-light
 536   background-color: #9f9fff !important
 537 .dark-square.chesstempo.highlight-dark
 538   background-color: #557fff !important
 539
 540 </style>