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: {}, //pixels coordinates + id of starting square (click or drag)
  27       settings: store.state.settings
  28     };
  29   },
  30   render(h) {
  31     if (!this.vr) {
  32       // Return empty div of class 'game' to avoid error when setting size
  33       return h("div", {
  34         class: {
  35           game: true
  36         }
  37       });
  38     }
  39     const [sizeX, sizeY] = [V.size.x, V.size.y];
  40     // Precompute hints squares to facilitate rendering
  41     let hintSquares = ArrayFun.init(sizeX, sizeY, false);
  42     this.possibleMoves.forEach(m => {
  43       hintSquares[m.end.x][m.end.y] = true;
  44     });
  45     // Also precompute in-check squares
  46     let incheckSq = ArrayFun.init(sizeX, sizeY, false);
  47     this.incheck.forEach(sq => {
  48       incheckSq[sq[0]][sq[1]] = true;
  49     });
  50
  51     const lm = this.lastMove;
  52     const showLight = (
  53       this.settings.highlight &&
  54       ["all","highlight"].includes(V.ShowMoves)
  55     );
  56     const orientation = !V.CanFlip ? "w" : this.orientation;
  57     // Ensure that squares colors do not change when board is flipped
  58     const lightSquareMod = (sizeX + sizeY) % 2;
  59     const showPiece = (x, y) => {
  60       return (
  61         this.vr.board[x][y] != V.EMPTY &&
  62         (!this.vr.enlightened || this.analyze || this.score != "*" ||
  63           (!!this.userColor && this.vr.enlightened[this.userColor][x][y]))
  64       );
  65     };
  66     const inHighlight = (x, y) => {
  67       return showLight && !!lm && (
  68         (lm.end.x == x && lm.end.y == y) ||
  69         (lm.start.x == x && lm.start.y == y));
  70     };
  71     const inShadow = (x, y) => {
  72       return (
  73         !this.analyze &&
  74         this.score == "*" &&
  75         this.vr.enlightened &&
  76         (!this.userColor || !this.vr.enlightened[this.userColor][x][y])
  77       );
  78     };
  79     // Create board element (+ reserves if needed by variant)
  80     let elementArray = [];
  81     const gameDiv = h(
  82       "div",
  83       {
  84         class: {
  85           game: true,
  86           clearer: true
  87         }
  88       },
  89       [...Array(sizeX).keys()].map(i => {
  90         const ci = orientation == "w" ? i : sizeX - i - 1;
  91         return h(
  92           "div",
  93           {
  94             class: {
  95               row: true
  96             },
  97             style: { opacity: this.choices.length > 0 ? "0.5" : "1" }
  98           },
  99           [...Array(sizeY).keys()].map(j => {
 100             const cj = orientation == "w" ? j : sizeY - j - 1;
 101             let elems = [];
 102             if (showPiece(ci, cj)) {
 103               elems.push(
 104                 h("img", {
 105                   class: {
 106                     piece: true,
 107                     ghost:
 108                       !!this.selectedPiece &&
 109                       this.selectedPiece.parentNode.id == "sq-" + ci + "-" + cj
 110                   },
 111                   attrs: {
 112                     src:
 113                       "/images/pieces/" +
 114                       this.vr.getPpath(this.vr.board[ci][cj], this.userColor, this.score) +
 115                       ".svg"
 116                   }
 117                 })
 118               );
 119             }
 120             if (this.settings.hints && hintSquares[ci][cj]) {
 121               elems.push(
 122                 h("img", {
 123                   class: {
 124                     "mark-square": true
 125                   },
 126                   attrs: {
 127                     src: "/images/mark.svg"
 128                   }
 129                 })
 130               );
 131             }
 132             const lightSquare = (ci + cj) % 2 == lightSquareMod;
 133             return h(
 134               "div",
 135               {
 136                 class: {
 137                   board: true,
 138                   ["board" + sizeY]: true,
 139                   "light-square": lightSquare,
 140                   "dark-square": !lightSquare,
 141                   [this.settings.bcolor]: true,
 142                   "in-shadow": inShadow(ci, cj),
 143                   "highlight-light": inHighlight(ci, cj) && lightSquare,
 144                   "highlight-dark": inHighlight(ci, cj) && !lightSquare,
 145                   "incheck-light": showLight && lightSquare && incheckSq[ci][cj],
 146                   "incheck-dark": showLight && !lightSquare && incheckSq[ci][cj]
 147                 },
 148                 attrs: {
 149                   id: getSquareId({ x: ci, y: cj })
 150                 }
 151               },
 152               elems
 153             );
 154           })
 155         );
 156       })
 157     );
 158     if (!!this.vr.reserve) {
 159       const playingColor = this.userColor || "w"; //default for an observer
 160       const shiftIdx = playingColor == "w" ? 0 : 1;
 161       let myReservePiecesArray = [];
 162       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 163         const qty = this.vr.reserve[playingColor][V.RESERVE_PIECES[i]];
 164         myReservePiecesArray.push(
 165           h(
 166             "div",
 167             {
 168               class: { board: true, ["board" + sizeY]: true },
 169               attrs: { id: getSquareId({ x: sizeX + shiftIdx, y: i }) },
 170               style: { opacity: qty > 0 ? 1 : 0.35 }
 171             },
 172             [
 173               h("img", {
 174                 class: { piece: true, reserve: true },
 175                 attrs: {
 176                   src:
 177                     "/images/pieces/" +
 178                     this.vr.getReservePpath(i, playingColor) +
 179                     ".svg"
 180                 }
 181               }),
 182               h("sup", { class: { "reserve-count": true } }, [ qty ])
 183             ]
 184           )
 185         );
 186       }
 187       let oppReservePiecesArray = [];
 188       const oppCol = V.GetOppCol(playingColor);
 189       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 190         const qty = this.vr.reserve[oppCol][V.RESERVE_PIECES[i]];
 191         oppReservePiecesArray.push(
 192           h(
 193             "div",
 194             {
 195               class: { board: true, ["board" + sizeY]: true },
 196               attrs: { id: getSquareId({ x: sizeX + (1 - shiftIdx), y: i }) },
 197               style: { opacity: qty > 0 ? 1 : 0.35 }
 198             },
 199             [
 200               h("img", {
 201                 class: { piece: true, reserve: true },
 202                 attrs: {
 203                   src:
 204                     "/images/pieces/" +
 205                     this.vr.getReservePpath(i, oppCol) +
 206                     ".svg"
 207                 }
 208               }),
 209               h("sup", { class: { "reserve-count": true } }, [ qty ])
 210             ]
 211           )
 212         );
 213       }
 214       const myReserveTop = (
 215         (playingColor == 'w' && orientation == 'b') ||
 216         (playingColor == 'b' && orientation == 'w')
 217       );
 218       // Center reserves, assuming same number of pieces for each side:
 219       const nbReservePieces = myReservePiecesArray.length;
 220       const marginLeft = ((100 - nbReservePieces * (100 / sizeY)) / 2) + "%";
 221       const reserveTop =
 222         h(
 223           "div",
 224           {
 225             class: {
 226               game: true,
 227               "reserve-div": true
 228             },
 229             style: {
 230               "margin-left": marginLeft
 231             }
 232           },
 233           [
 234             h(
 235               "div",
 236               {
 237                 class: {
 238                   row: true,
 239                   "reserve-row": true
 240                 }
 241               },
 242               myReserveTop ? myReservePiecesArray : oppReservePiecesArray
 243             )
 244           ]
 245         );
 246       var reserveBottom =
 247         h(
 248           "div",
 249           {
 250             class: {
 251               game: true,
 252               "reserve-div": true
 253             },
 254             style: {
 255               "margin-left": marginLeft
 256             }
 257           },
 258           [
 259             h(
 260               "div",
 261               {
 262                 class: {
 263                   row: true,
 264                   "reserve-row": true
 265                 }
 266               },
 267               myReserveTop ? oppReservePiecesArray : myReservePiecesArray
 268             )
 269           ]
 270         );
 271       elementArray.push(reserveTop);
 272     }
 273     elementArray.push(gameDiv);
 274     if (!!this.vr.reserve) elementArray.push(reserveBottom);
 275     const boardElt = document.querySelector(".game");
 276     if (this.choices.length > 0 && !!boardElt) {
 277       //no choices to show at first drawing
 278       const squareWidth = boardElt.offsetWidth / sizeY;
 279       const offset = [boardElt.offsetTop, boardElt.offsetLeft];
 280       const choices = h(
 281         "div",
 282         {
 283           attrs: { id: "choices" },
 284           class: { row: true },
 285           style: {
 286             top: offset[0] + (sizeY / 2) * squareWidth - squareWidth / 2 + "px",
 287             left:
 288               offset[1] +
 289               (squareWidth * (sizeY - this.choices.length)) / 2 +
 290               "px",
 291             width: this.choices.length * squareWidth + "px",
 292             height: squareWidth + "px"
 293           }
 294         },
 295         this.choices.map(m => {
 296           //a "choice" is a move
 297           return h(
 298             "div",
 299             {
 300               class: {
 301                 board: true,
 302                 ["board" + sizeY]: true
 303               },
 304               style: {
 305                 width: 100 / this.choices.length + "%",
 306                 "padding-bottom": 100 / this.choices.length + "%"
 307               }
 308             },
 309             [
 310               h("img", {
 311                 attrs: {
 312                   src:
 313                     "/images/pieces/" +
 314                     this.vr.getPpath(m.appear[0].c + m.appear[0].p) +
 315                     ".svg"
 316                 },
 317                 class: { "choice-piece": true },
 318                 on: {
 319                   click: () => {
 320                     this.play(m);
 321                     this.choices = [];
 322                   }
 323                 }
 324               })
 325             ]
 326           );
 327         })
 328       );
 329       elementArray.unshift(choices);
 330     }
 331     let onEvents = {};
 332     // NOTE: click = mousedown + mouseup
 333     if (this.mobileBrowser) {
 334       onEvents = {
 335         on: {
 336           touchstart: this.mousedown,
 337           touchmove: this.mousemove,
 338           touchend: this.mouseup
 339         }
 340       };
 341     } else {
 342       onEvents = {
 343         on: {
 344           mousedown: this.mousedown,
 345           mousemove: this.mousemove,
 346           mouseup: this.mouseup
 347         }
 348       };
 349     }
 350     return h("div", onEvents, elementArray);
 351   },
 352   methods: {
 353     mousedown: function(e) {
 354       // Abort if a piece is already being processed, or target is not a piece.
 355       // NOTE: just looking at classList[0] because piece is the first assigned class
 356       if (!!this.selectedPiece || e.target.classList[0] != "piece") return;
 357       e.preventDefault(); //disable native drag & drop
 358       let parent = e.target.parentNode; //the surrounding square
 359       // Next few lines to center the piece on mouse cursor
 360       let rect = parent.getBoundingClientRect();
 361       this.start = {
 362         x: rect.x + rect.width / 2,
 363         y: rect.y + rect.width / 2,
 364         id: parent.id
 365       };
 366       this.selectedPiece = e.target.cloneNode();
 367       let spStyle = this.selectedPiece.style;
 368       spStyle.position = "absolute";
 369       spStyle.top = 0;
 370       spStyle.display = "inline-block";
 371       spStyle.zIndex = 3000;
 372       const startSquare = getSquareFromId(parent.id);
 373       this.possibleMoves = [];
 374       const color = this.analyze ? this.vr.turn : this.userColor;
 375       if (this.vr.canIplay(color, startSquare))
 376         this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 377       // Next line add moving piece just after current image
 378       // (required for Crazyhouse reserve)
 379       parent.insertBefore(this.selectedPiece, e.target.nextSibling);
 380     },
 381     mousemove: function(e) {
 382       if (!this.selectedPiece) return;
 383       // There is an active element: move it around
 384       const [offsetX, offsetY] =
 385         this.mobileBrowser
 386           ? [e.changedTouches[0].pageX, e.changedTouches[0].pageY]
 387           : [e.clientX, e.clientY];
 388       this.selectedPiece.style.left = offsetX - this.start.x + "px";
 389       this.selectedPiece.style.top = offsetY - this.start.y + "px";
 390     },
 391     mouseup: function(e) {
 392       if (!this.selectedPiece) return;
 393       // There is an active element: obtain the move from start and end squares
 394       this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coords
 395       const [offsetX, offsetY] =
 396         this.mobileBrowser
 397           ? [e.changedTouches[0].pageX, e.changedTouches[0].pageY]
 398           : [e.clientX, e.clientY];
 399       let landing = document.elementFromPoint(offsetX, offsetY);
 400       this.selectedPiece.style.zIndex = 3000;
 401       // Next condition: classList.contains(piece) fails because of marks
 402       while (landing.tagName == "IMG") landing = landing.parentNode;
 403       if (this.start.id == landing.id)
 404         // One or multi clicks on same piece
 405         return;
 406       // OK: process move attempt, landing is a square node
 407       let endSquare = getSquareFromId(landing.id);
 408       let moves = this.findMatchingMoves(endSquare);
 409       this.possibleMoves = [];
 410       if (moves.length > 1) this.choices = moves;
 411       else if (moves.length == 1) this.play(moves[0]);
 412       // Else: impossible move
 413       this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 414       delete this.selectedPiece;
 415       this.selectedPiece = null;
 416     },
 417     findMatchingMoves: function(endSquare) {
 418       // Run through moves list and return the matching set (if promotions...)
 419       let moves = [];
 420       this.possibleMoves.forEach(function(m) {
 421         if (endSquare[0] == m.end.x && endSquare[1] == m.end.y) moves.push(m);
 422       });
 423       return moves;
 424     },
 425     play: function(move) {
 426       this.$emit("play-move", move);
 427     }
 428   }
 429 };
 430 </script>
 431
 432 <style lang="sass" scoped>
 433 .game.reserve-div
 434   margin-bottom: 18px
 435
 436 .reserve-count
 437   padding-left: 40%
 438
 439 .reserve-row
 440   margin-bottom: 15px
 441
 442 // NOTE: no variants with reserve of size != 8
 443
 444 .game
 445   width: 100%
 446   margin: 0
 447   .board
 448     cursor: pointer
 449
 450 #choices
 451   margin: 0
 452   position: absolute
 453   z-index: 300
 454   overflow-y: inherit
 455   background-color: rgba(0,0,0,0)
 456   img
 457     cursor: pointer
 458     background-color: #e6ee9c
 459     &:hover
 460       background-color: skyblue
 461     &.choice-piece
 462       width: 100%
 463       height: auto
 464       display: block
 465
 466 img.ghost
 467   position: absolute
 468   opacity: 0.4
 469   top: 0
 470
 471 .highlight-light
 472   background-color: rgba(0, 204, 102, 0.7) !important
 473 .highlight-dark
 474   background-color: rgba(0, 204, 102, 0.9) !important
 475
 476 .incheck-light
 477   background-color: rgba(204, 51, 0, 0.7) !important
 478 .incheck-dark
 479   background-color: rgba(204, 51, 0, 0.9) !important
 480
 481 .light-square.lichess
 482   background-color: #f0d9b5;
 483 .dark-square.lichess
 484   background-color: #b58863;
 485
 486 .light-square.chesscom
 487   background-color: #e5e5ca;
 488 .dark-square.chesscom
 489   background-color: #6f8f57;
 490
 491 .light-square.chesstempo
 492   background-color: #fdfdfd;
 493 .dark-square.chesstempo
 494   background-color: #88a0a8;
 495 </style>