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 for highlights.
   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":
 157                     showCheck && lightSquare && incheckSq[ci][cj],
 158                   "incheck-dark":
 159                     showCheck && !lightSquare && incheckSq[ci][cj]
 160                 },
 161                 attrs: {
 162                   id: getSquareId({ x: ci, y: cj })
 163                 }
 164               },
 165               elems
 166             );
 167           })
 168         );
 169       })
 170     );
 171     if (!!this.vr.reserve) {
 172       const playingColor = this.userColor || "w"; //default for an observer
 173       const shiftIdx = playingColor == "w" ? 0 : 1;
 174       let myReservePiecesArray = [];
 175       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 176         const qty = this.vr.reserve[playingColor][V.RESERVE_PIECES[i]];
 177         myReservePiecesArray.push(
 178           h(
 179             "div",
 180             {
 181               "class": { board: true, ["board" + sizeY]: true },
 182               attrs: { id: getSquareId({ x: sizeX + shiftIdx, y: i }) },
 183               style: { opacity: qty > 0 ? 1 : 0.35 }
 184             },
 185             [
 186               h("img", {
 187                 "class": { piece: true, reserve: true },
 188                 attrs: {
 189                   src:
 190                     "/images/pieces/" +
 191                     this.vr.getReservePpath(i, playingColor) +
 192                     ".svg"
 193                 }
 194               }),
 195               h("sup", { "class": { "reserve-count": true } }, [ qty ])
 196             ]
 197           )
 198         );
 199       }
 200       let oppReservePiecesArray = [];
 201       const oppCol = V.GetOppCol(playingColor);
 202       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 203         const qty = this.vr.reserve[oppCol][V.RESERVE_PIECES[i]];
 204         oppReservePiecesArray.push(
 205           h(
 206             "div",
 207             {
 208               "class": { board: true, ["board" + sizeY]: true },
 209               attrs: { id: getSquareId({ x: sizeX + (1 - shiftIdx), y: i }) },
 210               style: { opacity: qty > 0 ? 1 : 0.35 }
 211             },
 212             [
 213               h("img", {
 214                 "class": { piece: true, reserve: true },
 215                 attrs: {
 216                   src:
 217                     "/images/pieces/" +
 218                     this.vr.getReservePpath(i, oppCol) +
 219                     ".svg"
 220                 }
 221               }),
 222               h("sup", { "class": { "reserve-count": true } }, [ qty ])
 223             ]
 224           )
 225         );
 226       }
 227       const myReserveTop = (
 228         (playingColor == 'w' && orientation == 'b') ||
 229         (playingColor == 'b' && orientation == 'w')
 230       );
 231       // Center reserves, assuming same number of pieces for each side:
 232       const nbReservePieces = myReservePiecesArray.length;
 233       const marginLeft = ((100 - nbReservePieces * (100 / sizeY)) / 2) + "%";
 234       const reserveTop =
 235         h(
 236           "div",
 237           {
 238             "class": {
 239               game: true,
 240               "reserve-div": true
 241             },
 242             style: {
 243               "margin-left": marginLeft
 244             }
 245           },
 246           [
 247             h(
 248               "div",
 249               {
 250                 "class": {
 251                   row: true,
 252                   "reserve-row": true
 253                 }
 254               },
 255               myReserveTop ? myReservePiecesArray : oppReservePiecesArray
 256             )
 257           ]
 258         );
 259       var reserveBottom =
 260         h(
 261           "div",
 262           {
 263             "class": {
 264               game: true,
 265               "reserve-div": true
 266             },
 267             style: {
 268               "margin-left": marginLeft
 269             }
 270           },
 271           [
 272             h(
 273               "div",
 274               {
 275                 "class": {
 276                   row: true,
 277                   "reserve-row": true
 278                 }
 279               },
 280               myReserveTop ? oppReservePiecesArray : myReservePiecesArray
 281             )
 282           ]
 283         );
 284       elementArray.push(reserveTop);
 285     }
 286     elementArray.push(gameDiv);
 287     if (!!this.vr.reserve) elementArray.push(reserveBottom);
 288     const boardElt = document.querySelector(".game");
 289     if (this.choices.length > 0 && !!boardElt) {
 290       // No choices to show at first drawing
 291       const squareWidth = boardElt.offsetWidth / sizeY;
 292       const offset = [boardElt.offsetTop, boardElt.offsetLeft];
 293       const maxNbeltsPerRow = Math.min(this.choices.length, sizeY);
 294       let topOffset = offset[0] + (sizeY / 2) * squareWidth - squareWidth / 2;
 295       let choicesHeight = squareWidth;
 296       if (this.choices.length >= sizeY) {
 297         // A second row is required (Eightpieces variant)
 298         topOffset -= squareWidth / 2;
 299         choicesHeight *= 2;
 300       }
 301       const choices = h(
 302         "div",
 303         {
 304           attrs: { id: "choices" },
 305           "class": { row: true },
 306           style: {
 307             top: topOffset + "px",
 308             left:
 309               offset[1] +
 310               (squareWidth * Math.max(sizeY - this.choices.length, 0)) / 2 +
 311               "px",
 312             width: (maxNbeltsPerRow * squareWidth) + "px",
 313             height: choicesHeight + "px"
 314           }
 315         },
 316         [ h(
 317           "div",
 318           {
 319             "class": { "full-width": true }
 320           },
 321           this.choices.map(m => {
 322             // A "choice" is a move
 323             const applyMove = (e) => {
 324               e.stopPropagation();
 325               // Force a delay between move is shown and clicked
 326               // (otherwise a "double-click" bug might occur)
 327               if (Date.now() - this.clickTime < 200) return;
 328               this.choices = [];
 329               this.play(m);
 330             };
 331             const onClick =
 332               this.mobileBrowser
 333                 ? { touchend: applyMove }
 334                 : { mouseup: applyMove };
 335             return h(
 336               "div",
 337               {
 338                 "class": {
 339                   board: true,
 340                   ["board" + sizeY]: true
 341                 },
 342                 style: {
 343                   width: (100 / maxNbeltsPerRow) + "%",
 344                   "padding-bottom": (100 / maxNbeltsPerRow) + "%"
 345                 }
 346               },
 347               [
 348                 h("img", {
 349                   attrs: {
 350                     src:
 351                       "/images/pieces/" +
 352                       // orientation: extra arg useful for some variants:
 353                       this.vr.getPPpath(m, this.orientation) +
 354                       V.IMAGE_EXTENSION
 355                   },
 356                   "class": { "choice-piece": true },
 357                   on: onClick
 358                 })
 359               ]
 360             );
 361           })
 362         ) ]
 363       );
 364       elementArray.unshift(choices);
 365     }
 366     let onEvents = {};
 367     // NOTE: click = mousedown + mouseup
 368     if (this.mobileBrowser) {
 369       onEvents = {
 370         on: {
 371           touchstart: this.mousedown,
 372           touchmove: this.mousemove,
 373           touchend: this.mouseup
 374         }
 375       };
 376     } else {
 377       onEvents = {
 378         on: {
 379           mousedown: this.mousedown,
 380           mousemove: this.mousemove,
 381           mouseup: this.mouseup
 382         }
 383       };
 384     }
 385     return h("div", onEvents, elementArray);
 386   },
 387   methods: {
 388     mousedown: function(e) {
 389       e.preventDefault();
 390       if (!this.start) {
 391         // Start square must contain a piece.
 392         // NOTE: classList[0] is enough: 'piece' is the first assigned class
 393         if (e.target.classList[0] != "piece") return;
 394         let parent = e.target.parentNode; //surrounding square
 395         // Show possible moves if current player allowed to play
 396         const startSquare = getSquareFromId(parent.id);
 397         this.possibleMoves = [];
 398         const color = this.analyze ? this.vr.turn : this.userColor;
 399         if (this.vr.canIplay(color, startSquare))
 400           this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 401         // For potential drag'n drop, remember start coordinates
 402         // (to center the piece on mouse cursor)
 403         let rect = parent.getBoundingClientRect();
 404         this.start = {
 405           x: rect.x + rect.width / 2,
 406           y: rect.y + rect.width / 2,
 407           id: parent.id
 408         };
 409         // Add the moving piece to the board, just after current image
 410         this.selectedPiece = e.target.cloneNode();
 411         Object.assign(
 412           this.selectedPiece.style,
 413           {
 414             position: "absolute",
 415             top: 0,
 416             display: "inline-block",
 417             zIndex: 3000
 418           }
 419         );
 420         parent.insertBefore(this.selectedPiece, e.target.nextSibling);
 421       } else {
 422         this.processMoveAttempt(e);
 423       }
 424     },
 425     mousemove: function(e) {
 426       if (!this.selectedPiece) return;
 427       e.preventDefault();
 428       // There is an active element: move it around
 429       const [offsetX, offsetY] =
 430         this.mobileBrowser
 431           ? [e.changedTouches[0].pageX, e.changedTouches[0].pageY]
 432           : [e.clientX, e.clientY];
 433       Object.assign(
 434         this.selectedPiece.style,
 435         {
 436           left: offsetX - this.start.x + "px",
 437           top: offsetY - this.start.y + "px"
 438         }
 439       );
 440     },
 441     mouseup: function(e) {
 442       if (!this.selectedPiece) return;
 443       e.preventDefault();
 444       // Drag'n drop. Selected piece is no longer needed:
 445       this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 446       delete this.selectedPiece;
 447       this.selectedPiece = null;
 448       this.processMoveAttempt(e);
 449     },
 450     processMoveAttempt: function(e) {
 451       // Obtain the move from start and end squares
 452       const [offsetX, offsetY] =
 453         this.mobileBrowser
 454           ? [e.changedTouches[0].pageX, e.changedTouches[0].pageY]
 455           : [e.clientX, e.clientY];
 456       let landing = document.elementFromPoint(offsetX, offsetY);
 457       // Next condition: classList.contains(piece) fails because of marks
 458       while (landing.tagName == "IMG") landing = landing.parentNode;
 459       if (this.start.id == landing.id) {
 460         if (this.click == landing.id) {
 461           // Second click on same square: cancel current move
 462           this.possibleMoves = [];
 463           this.start = null;
 464           this.click = "";
 465         } else this.click = landing.id;
 466         return;
 467       }
 468       this.start = null;
 469       // OK: process move attempt, landing is a square node
 470       let endSquare = getSquareFromId(landing.id);
 471       let moves = this.findMatchingMoves(endSquare);
 472       this.possibleMoves = [];
 473       if (moves.length > 1) {
 474         this.clickTime = Date.now();
 475         this.choices = moves;
 476       } else if (moves.length == 1) this.play(moves[0]);
 477       // else: forbidden move attempt
 478     },
 479     findMatchingMoves: function(endSquare) {
 480       // Run through moves list and return the matching set (if promotions...)
 481       return (
 482         this.possibleMoves.filter(m => {
 483           return (endSquare[0] == m.end.x && endSquare[1] == m.end.y);
 484         })
 485       );
 486     },
 487     play: function(move) {
 488       this.$emit("play-move", move);
 489     }
 490   }
 491 };
 492 </script>
 493
 494 <style lang="sass" scoped>
 495 // NOTE: no variants with reserve of size != 8
 496 .game.reserve-div
 497   margin-bottom: 18px
 498 .reserve-count
 499   padding-left: 40%
 500 .reserve-row
 501   margin-bottom: 15px
 502
 503 .full-width
 504   width: 100%
 505
 506 .game
 507   user-select: none
 508   width: 100%
 509   margin: 0
 510   .board
 511     cursor: pointer
 512
 513 #choices
 514   user-select: none
 515   margin: 0
 516   position: absolute
 517   z-index: 300
 518   overflow-y: inherit
 519   background-color: rgba(0,0,0,0)
 520   img
 521     cursor: pointer
 522     background-color: #e6ee9c
 523     &:hover
 524       background-color: skyblue
 525     &.choice-piece
 526       width: 100%
 527       height: auto
 528       display: block
 529
 530 img.ghost
 531   position: absolute
 532   opacity: 0.5
 533   top: 0
 534
 535 .incheck-light
 536   background-color: rgba(204, 51, 0, 0.7) !important
 537 .incheck-dark
 538   background-color: rgba(204, 51, 0, 0.9) !important
 539
 540 .light-square.lichess
 541   background-color: #f0d9b5;
 542 .dark-square.lichess
 543   background-color: #b58863;
 544
 545 .light-square.chesscom
 546   background-color: #e5e5ca;
 547 .dark-square.chesscom
 548   background-color: #6f8f57;
 549
 550 .light-square.chesstempo
 551   background-color: #dfdfdf;
 552 .dark-square.chesstempo
 553   background-color: #7287b6;
 554
 555 // TODO: no predefined highlight colors, but layers. How?
 556
 557 .light-square.lichess.highlight-light
 558   background-color: #cdd26a
 559 .dark-square.lichess.highlight-dark
 560   background-color: #aaa23a
 561
 562 .light-square.chesscom.highlight-light
 563   background-color: #f7f783
 564 .dark-square.chesscom.highlight-dark
 565   background-color: #bacb44
 566
 567 .light-square.chesstempo.highlight-light
 568   background-color: #9f9fff
 569 .dark-square.chesstempo.highlight-dark
 570   background-color: #557fff
 571
 572 </style>