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       clickTime: 0,
  29       settings: store.state.settings
  30     };
  31   },
  32   render(h) {
  33     if (!this.vr) {
  34       // Return empty div of class 'game' to avoid error when setting size
  35       return h("div", {
  36         class: {
  37           game: true
  38         }
  39       });
  40     }
  41     const [sizeX, sizeY] = [V.size.x, V.size.y];
  42     // Precompute hints squares to facilitate rendering
  43     let hintSquares = ArrayFun.init(sizeX, sizeY, false);
  44     this.possibleMoves.forEach(m => {
  45       hintSquares[m.end.x][m.end.y] = true;
  46     });
  47     // Also precompute in-check squares
  48     let incheckSq = ArrayFun.init(sizeX, sizeY, false);
  49     this.incheck.forEach(sq => {
  50       incheckSq[sq[0]][sq[1]] = true;
  51     });
  52
  53     const lm = this.lastMove;
  54     const showLight = (
  55       this.settings.highlight &&
  56       ["all","highlight"].includes(V.ShowMoves)
  57     );
  58     const showCheck = (
  59       this.settings.highlight &&
  60       ["all","highlight","byrow"].includes(V.ShowMoves)
  61     );
  62     const orientation = !V.CanFlip ? "w" : this.orientation;
  63     // Ensure that squares colors do not change when board is flipped
  64     const lightSquareMod = (sizeX + sizeY) % 2;
  65     const showPiece = (x, y) => {
  66       return (
  67         this.vr.board[x][y] != V.EMPTY &&
  68         (!this.vr.enlightened || this.analyze || this.score != "*" ||
  69           (!!this.userColor && this.vr.enlightened[this.userColor][x][y]))
  70       );
  71     };
  72     const inHighlight = (x, y) => {
  73       return showLight && !!lm && (
  74         (lm.end.x == x && lm.end.y == y) ||
  75         (lm.start.x == x && lm.start.y == y));
  76     };
  77     const inShadow = (x, y) => {
  78       return (
  79         !this.analyze &&
  80         this.score == "*" &&
  81         this.vr.enlightened &&
  82         (!this.userColor || !this.vr.enlightened[this.userColor][x][y])
  83       );
  84     };
  85     // Create board element (+ reserves if needed by variant)
  86     let elementArray = [];
  87     const gameDiv = h(
  88       "div",
  89       {
  90         class: {
  91           game: true,
  92           clearer: true
  93         }
  94       },
  95       [...Array(sizeX).keys()].map(i => {
  96         const ci = orientation == "w" ? i : sizeX - i - 1;
  97         return h(
  98           "div",
  99           {
 100             class: {
 101               row: true
 102             },
 103             style: { opacity: this.choices.length > 0 ? "0.5" : "1" }
 104           },
 105           [...Array(sizeY).keys()].map(j => {
 106             const cj = orientation == "w" ? j : sizeY - j - 1;
 107             let elems = [];
 108             if (showPiece(ci, cj)) {
 109               elems.push(
 110                 h("img", {
 111                   class: {
 112                     piece: true,
 113                     ghost:
 114                       !!this.selectedPiece &&
 115                       this.selectedPiece.parentNode.id == "sq-" + ci + "-" + cj
 116                   },
 117                   attrs: {
 118                     src:
 119                       "/images/pieces/" +
 120                       this.vr.getPpath(
 121                         this.vr.board[ci][cj],
 122                         // Extra args useful for some variants:
 123                         this.userColor,
 124                         this.score,
 125                         this.orientation) +
 126                       V.IMAGE_EXTENSION
 127                   }
 128                 })
 129               );
 130             }
 131             if (this.settings.hints && hintSquares[ci][cj]) {
 132               elems.push(
 133                 h("img", {
 134                   class: {
 135                     "mark-square": true
 136                   },
 137                   attrs: {
 138                     src: "/images/mark.svg"
 139                   }
 140                 })
 141               );
 142             }
 143             const lightSquare = (ci + cj) % 2 == lightSquareMod;
 144             return h(
 145               "div",
 146               {
 147                 class: {
 148                   board: true,
 149                   ["board" + sizeY]: true,
 150                   "light-square": lightSquare,
 151                   "dark-square": !lightSquare,
 152                   [this.settings.bcolor]: true,
 153                   "in-shadow": inShadow(ci, cj),
 154                   "highlight-light": inHighlight(ci, cj) && lightSquare,
 155                   "highlight-dark": inHighlight(ci, cj) && !lightSquare,
 156                   "incheck-light": showCheck && lightSquare && incheckSq[ci][cj],
 157                   "incheck-dark": showCheck && !lightSquare && incheckSq[ci][cj]
 158                 },
 159                 attrs: {
 160                   id: getSquareId({ x: ci, y: cj })
 161                 }
 162               },
 163               elems
 164             );
 165           })
 166         );
 167       })
 168     );
 169     if (!!this.vr.reserve) {
 170       const playingColor = this.userColor || "w"; //default for an observer
 171       const shiftIdx = playingColor == "w" ? 0 : 1;
 172       let myReservePiecesArray = [];
 173       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 174         const qty = this.vr.reserve[playingColor][V.RESERVE_PIECES[i]];
 175         myReservePiecesArray.push(
 176           h(
 177             "div",
 178             {
 179               class: { board: true, ["board" + sizeY]: true },
 180               attrs: { id: getSquareId({ x: sizeX + shiftIdx, y: i }) },
 181               style: { opacity: qty > 0 ? 1 : 0.35 }
 182             },
 183             [
 184               h("img", {
 185                 class: { piece: true, reserve: true },
 186                 attrs: {
 187                   src:
 188                     "/images/pieces/" +
 189                     this.vr.getReservePpath(i, playingColor) +
 190                     ".svg"
 191                 }
 192               }),
 193               h("sup", { class: { "reserve-count": true } }, [ qty ])
 194             ]
 195           )
 196         );
 197       }
 198       let oppReservePiecesArray = [];
 199       const oppCol = V.GetOppCol(playingColor);
 200       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 201         const qty = this.vr.reserve[oppCol][V.RESERVE_PIECES[i]];
 202         oppReservePiecesArray.push(
 203           h(
 204             "div",
 205             {
 206               class: { board: true, ["board" + sizeY]: true },
 207               attrs: { id: getSquareId({ x: sizeX + (1 - shiftIdx), y: i }) },
 208               style: { opacity: qty > 0 ? 1 : 0.35 }
 209             },
 210             [
 211               h("img", {
 212                 class: { piece: true, reserve: true },
 213                 attrs: {
 214                   src:
 215                     "/images/pieces/" +
 216                     this.vr.getReservePpath(i, oppCol) +
 217                     ".svg"
 218                 }
 219               }),
 220               h("sup", { class: { "reserve-count": true } }, [ qty ])
 221             ]
 222           )
 223         );
 224       }
 225       const myReserveTop = (
 226         (playingColor == 'w' && orientation == 'b') ||
 227         (playingColor == 'b' && orientation == 'w')
 228       );
 229       // Center reserves, assuming same number of pieces for each side:
 230       const nbReservePieces = myReservePiecesArray.length;
 231       const marginLeft = ((100 - nbReservePieces * (100 / sizeY)) / 2) + "%";
 232       const reserveTop =
 233         h(
 234           "div",
 235           {
 236             class: {
 237               game: true,
 238               "reserve-div": true
 239             },
 240             style: {
 241               "margin-left": marginLeft
 242             }
 243           },
 244           [
 245             h(
 246               "div",
 247               {
 248                 class: {
 249                   row: true,
 250                   "reserve-row": true
 251                 }
 252               },
 253               myReserveTop ? myReservePiecesArray : oppReservePiecesArray
 254             )
 255           ]
 256         );
 257       var reserveBottom =
 258         h(
 259           "div",
 260           {
 261             class: {
 262               game: true,
 263               "reserve-div": true
 264             },
 265             style: {
 266               "margin-left": marginLeft
 267             }
 268           },
 269           [
 270             h(
 271               "div",
 272               {
 273                 class: {
 274                   row: true,
 275                   "reserve-row": true
 276                 }
 277               },
 278               myReserveTop ? oppReservePiecesArray : myReservePiecesArray
 279             )
 280           ]
 281         );
 282       elementArray.push(reserveTop);
 283     }
 284     elementArray.push(gameDiv);
 285     if (!!this.vr.reserve) elementArray.push(reserveBottom);
 286     const boardElt = document.querySelector(".game");
 287     if (this.choices.length > 0 && !!boardElt) {
 288       // No choices to show at first drawing
 289       const squareWidth = boardElt.offsetWidth / sizeY;
 290       const offset = [boardElt.offsetTop, boardElt.offsetLeft];
 291       const maxNbeltsPerRow = Math.min(this.choices.length, sizeY);
 292       let topOffset = offset[0] + (sizeY / 2) * squareWidth - squareWidth / 2;
 293       let choicesHeight = squareWidth;
 294       if (this.choices.length >= sizeY) {
 295         // A second row is required (Eightpieces variant)
 296         topOffset -= squareWidth / 2;
 297         choicesHeight *= 2;
 298       }
 299       const choices = h(
 300         "div",
 301         {
 302           attrs: { id: "choices" },
 303           class: { row: true },
 304           style: {
 305             top: topOffset + "px",
 306             left:
 307               offset[1] +
 308               (squareWidth * Math.max(sizeY - this.choices.length, 0)) / 2 +
 309               "px",
 310             width: (maxNbeltsPerRow * squareWidth) + "px",
 311             height: choicesHeight + "px"
 312           }
 313         },
 314         [ h(
 315           "div",
 316           { },
 317           this.choices.map(m => {
 318             // A "choice" is a move
 319             const applyMove = (e) => {
 320               e.stopPropagation();
 321               // Force a delay between move is shown and clicked
 322               // (otherwise a "double-click" bug might occur)
 323               if (Date.now() - this.clickTime < 200) return;
 324               this.choices = [];
 325               this.play(m);
 326             };
 327             const onClick =
 328               this.mobileBrowser
 329                 ? { touchend: applyMove }
 330                 : { mouseup: applyMove };
 331             return h(
 332               "div",
 333               {
 334                 class: {
 335                   board: true,
 336                   ["board" + sizeY]: true
 337                 },
 338                 style: {
 339                   width: (100 / maxNbeltsPerRow) + "%",
 340                   "padding-bottom": (100 / maxNbeltsPerRow) + "%"
 341                 }
 342               },
 343               [
 344                 h("img", {
 345                   attrs: {
 346                     src:
 347                       "/images/pieces/" +
 348                       // orientation: extra arg useful for some variants:
 349                       this.vr.getPPpath(m, this.orientation) +
 350                       V.IMAGE_EXTENSION
 351                   },
 352                   class: { "choice-piece": true },
 353                   on: onClick
 354                 })
 355               ]
 356             );
 357           })
 358         ) ]
 359       );
 360       elementArray.unshift(choices);
 361     }
 362     let onEvents = {};
 363     // NOTE: click = mousedown + mouseup
 364     if (this.mobileBrowser) {
 365       onEvents = {
 366         on: {
 367           touchstart: this.mousedown,
 368           touchmove: this.mousemove,
 369           touchend: this.mouseup
 370         }
 371       };
 372     } else {
 373       onEvents = {
 374         on: {
 375           mousedown: this.mousedown,
 376           mousemove: this.mousemove,
 377           mouseup: this.mouseup
 378         }
 379       };
 380     }
 381     return h("div", onEvents, elementArray);
 382   },
 383   methods: {
 384     mousedown: function(e) {
 385       e.preventDefault();
 386       if (!this.start) {
 387         // Start square must contain a piece.
 388         // NOTE: classList[0] is enough: 'piece' is the first assigned class
 389         if (e.target.classList[0] != "piece") return;
 390         let parent = e.target.parentNode; //surrounding square
 391         // Show possible moves if current player allowed to play
 392         const startSquare = getSquareFromId(parent.id);
 393         this.possibleMoves = [];
 394         const color = this.analyze ? this.vr.turn : this.userColor;
 395         if (this.vr.canIplay(color, startSquare))
 396           this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 397         // For potential drag'n drop, remember start coordinates
 398         // (to center the piece on mouse cursor)
 399         let rect = parent.getBoundingClientRect();
 400         this.start = {
 401           x: rect.x + rect.width / 2,
 402           y: rect.y + rect.width / 2,
 403           id: parent.id
 404         };
 405         // Add the moving piece to the board, just after current image
 406         this.selectedPiece = e.target.cloneNode();
 407         Object.assign(
 408           this.selectedPiece.style,
 409           {
 410             position: "absolute",
 411             top: 0,
 412             display: "inline-block",
 413             zIndex: 3000
 414           }
 415         );
 416         parent.insertBefore(this.selectedPiece, e.target.nextSibling);
 417       } else {
 418         this.processMoveAttempt(e);
 419       }
 420     },
 421     mousemove: function(e) {
 422       if (!this.selectedPiece) return;
 423       e.preventDefault();
 424       // There is an active element: move it around
 425       const [offsetX, offsetY] =
 426         this.mobileBrowser
 427           ? [e.changedTouches[0].pageX, e.changedTouches[0].pageY]
 428           : [e.clientX, e.clientY];
 429       Object.assign(
 430         this.selectedPiece.style,
 431         {
 432           left: offsetX - this.start.x + "px",
 433           top: offsetY - this.start.y + "px"
 434         }
 435       );
 436     },
 437     mouseup: function(e) {
 438       if (!this.selectedPiece) return;
 439       e.preventDefault();
 440       // Drag'n drop. Selected piece is no longer needed:
 441       this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 442       delete this.selectedPiece;
 443       this.selectedPiece = null;
 444       this.processMoveAttempt(e);
 445     },
 446     processMoveAttempt: function(e) {
 447       // Obtain the move from start and end squares
 448       const [offsetX, offsetY] =
 449         this.mobileBrowser
 450           ? [e.changedTouches[0].pageX, e.changedTouches[0].pageY]
 451           : [e.clientX, e.clientY];
 452       let landing = document.elementFromPoint(offsetX, offsetY);
 453       // Next condition: classList.contains(piece) fails because of marks
 454       while (landing.tagName == "IMG") landing = landing.parentNode;
 455       if (this.start.id == landing.id) {
 456         if (this.click == landing.id) {
 457           // Second click on same square: cancel current move
 458           this.possibleMoves = [];
 459           this.start = null;
 460           this.click = "";
 461         } else this.click = landing.id;
 462         return;
 463       }
 464       this.start = null;
 465       // OK: process move attempt, landing is a square node
 466       let endSquare = getSquareFromId(landing.id);
 467       let moves = this.findMatchingMoves(endSquare);
 468       this.possibleMoves = [];
 469       if (moves.length > 1) {
 470         this.clickTime = Date.now();
 471         this.choices = moves;
 472       } else if (moves.length == 1) this.play(moves[0]);
 473       // else: forbidden move attempt
 474     },
 475     findMatchingMoves: function(endSquare) {
 476       // Run through moves list and return the matching set (if promotions...)
 477       return (
 478         this.possibleMoves.filter(m => {
 479           return (endSquare[0] == m.end.x && endSquare[1] == m.end.y);
 480         })
 481       );
 482     },
 483     play: function(move) {
 484       this.$emit("play-move", move);
 485     }
 486   }
 487 };
 488 </script>
 489
 490 <style lang="sass" scoped>
 491 .game.reserve-div
 492   margin-bottom: 18px
 493
 494 .reserve-count
 495   padding-left: 40%
 496
 497 .reserve-row
 498   margin-bottom: 15px
 499
 500 // NOTE: no variants with reserve of size != 8
 501
 502 .game
 503   user-select: none
 504   width: 100%
 505   margin: 0
 506   .board
 507     cursor: pointer
 508
 509 #choices
 510   user-select: none
 511   margin: 0
 512   position: absolute
 513   z-index: 300
 514   overflow-y: inherit
 515   background-color: rgba(0,0,0,0)
 516   img
 517     cursor: pointer
 518     background-color: #e6ee9c
 519     &:hover
 520       background-color: skyblue
 521     &.choice-piece
 522       width: 100%
 523       height: auto
 524       display: block
 525
 526 img.ghost
 527   position: absolute
 528   opacity: 0.5
 529   top: 0
 530
 531 .incheck-light
 532   background-color: rgba(204, 51, 0, 0.7) !important
 533 .incheck-dark
 534   background-color: rgba(204, 51, 0, 0.9) !important
 535
 536 .light-square.lichess
 537   background-color: #f0d9b5;
 538 .dark-square.lichess
 539   background-color: #b58863;
 540
 541 .light-square.chesscom
 542   background-color: #e5e5ca;
 543 .dark-square.chesscom
 544   background-color: #6f8f57;
 545
 546 .light-square.chesstempo
 547   background-color: #dfdfdf;
 548 .dark-square.chesstempo
 549   background-color: #7287b6;
 550
 551 // TODO: no predefined highlight colors, but layers. How?
 552
 553 .light-square.lichess.highlight-light
 554   background-color: #cdd26a
 555 .dark-square.lichess.highlight-dark
 556   background-color: #aaa23a
 557
 558 .light-square.chesscom.highlight-light
 559   background-color: #f7f783
 560 .dark-square.chesscom.highlight-dark
 561   background-color: #bacb44
 562
 563 .light-square.chesstempo.highlight-light
 564   background-color: #9f9fff
 565 .dark-square.chesstempo.highlight-dark
 566   background-color: #557fff
 567
 568 </style>