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       startArrow: null,
  28       movingArrow: { x: -1, y: -1 },
  29       arrows: [], //object of {start: x,y / end: x,y}
  30       circles: {}, //object of squares' ID --> true (TODO: use a set?)
  31       click: "",
  32       clickTime: 0,
  33       settings: store.state.settings
  34     };
  35   },
  36   render(h) {
  37     if (!this.vr) {
  38       // Return empty div of class 'game' to avoid error when setting size
  39       return h("div", {
  40         class: {
  41           game: true
  42         }
  43       });
  44     }
  45     const [sizeX, sizeY] = [V.size.x, V.size.y];
  46     // Precompute hints squares to facilitate rendering
  47     let hintSquares = ArrayFun.init(sizeX, sizeY, false);
  48     this.possibleMoves.forEach(m => {
  49       hintSquares[m.end.x][m.end.y] = true;
  50     });
  51     // Also precompute in-check squares
  52     let incheckSq = ArrayFun.init(sizeX, sizeY, false);
  53     this.incheck.forEach(sq => {
  54       incheckSq[sq[0]][sq[1]] = true;
  55     });
  56
  57     const lm = this.lastMove;
  58     const showLight = (
  59       this.settings.highlight &&
  60       ["all","highlight"].includes(V.ShowMoves)
  61     );
  62     const showCheck = (
  63       this.settings.highlight &&
  64       ["all","highlight","byrow"].includes(V.ShowMoves)
  65     );
  66     const orientation = !V.CanFlip ? "w" : this.orientation;
  67     // Ensure that squares colors do not change when board is flipped
  68     const lightSquareMod = (sizeX + sizeY) % 2;
  69     const showPiece = (x, y) => {
  70       return (
  71         this.vr.board[x][y] != V.EMPTY &&
  72         (!this.vr.enlightened || this.analyze || this.score != "*" ||
  73           (!!this.userColor && this.vr.enlightened[this.userColor][x][y]))
  74       );
  75     };
  76     const inHighlight = (x, y) => {
  77       return showLight && !!lm && (
  78         (lm.end.x == x && lm.end.y == y) ||
  79         (lm.start.x == x && lm.start.y == y));
  80     };
  81     const inShadow = (x, y) => {
  82       return (
  83         !this.analyze &&
  84         this.score == "*" &&
  85         this.vr.enlightened &&
  86         (!this.userColor || !this.vr.enlightened[this.userColor][x][y])
  87       );
  88     };
  89     // Create board element (+ reserves if needed by variant)
  90     let elementArray = [];
  91     const gameDiv = h(
  92       "div",
  93       {
  94         "class": {
  95           game: true,
  96           clearer: true
  97         }
  98       },
  99       [...Array(sizeX).keys()].map(i => {
 100         const ci = orientation == "w" ? i : sizeX - i - 1;
 101         return h(
 102           "div",
 103           {
 104             "class": {
 105               row: true
 106             },
 107             style: { opacity: this.choices.length > 0 ? "0.5" : "1" }
 108           },
 109           [...Array(sizeY).keys()].map(j => {
 110             const cj = orientation == "w" ? j : sizeY - j - 1;
 111             const squareId = "sq-" + ci + "-" + cj;
 112             let elems = [];
 113             if (showPiece(ci, cj)) {
 114               elems.push(
 115                 h("img", {
 116                   "class": {
 117                     piece: true,
 118                     ghost:
 119                       !!this.selectedPiece &&
 120                       this.selectedPiece.parentNode.id == squareId
 121                   },
 122                   attrs: {
 123                     src:
 124                       "/images/pieces/" +
 125                       this.vr.getPpath(
 126                         this.vr.board[ci][cj],
 127                         // Extra args useful for some variants:
 128                         this.userColor,
 129                         this.score,
 130                         this.orientation) +
 131                       V.IMAGE_EXTENSION
 132                   }
 133                 })
 134               );
 135             }
 136             if (this.settings.hints && hintSquares[ci][cj]) {
 137               elems.push(
 138                 h("img", {
 139                   "class": {
 140                     "mark-square": true
 141                   },
 142                   attrs: {
 143                     src: "/images/mark.svg"
 144                   }
 145                 })
 146               );
 147             }
 148             if (!!this.circles[squareId]) {
 149               elems.push(
 150                 h("img", {
 151                   "class": {
 152                     "circle-square": true
 153                   },
 154                   attrs: {
 155                     src: "/images/circle.svg"
 156                   }
 157                 })
 158               );
 159             }
 160             const lightSquare = (ci + cj) % 2 == lightSquareMod;
 161             return h(
 162               "div",
 163               {
 164                 "class": {
 165                   board: true,
 166                   ["board" + sizeY]: true,
 167                   "light-square": lightSquare,
 168                   "dark-square": !lightSquare,
 169                   [this.settings.bcolor]: true,
 170                   "in-shadow": inShadow(ci, cj),
 171                   "highlight-light": inHighlight(ci, cj) && lightSquare,
 172                   "highlight-dark": inHighlight(ci, cj) && !lightSquare,
 173                   "incheck-light":
 174                     showCheck && lightSquare && incheckSq[ci][cj],
 175                   "incheck-dark":
 176                     showCheck && !lightSquare && incheckSq[ci][cj]
 177                 },
 178                 attrs: {
 179                   id: getSquareId({ x: ci, y: cj })
 180                 }
 181               },
 182               elems
 183             );
 184           })
 185         );
 186       })
 187     );
 188     if (!!this.vr.reserve) {
 189       const playingColor = this.userColor || "w"; //default for an observer
 190       const shiftIdx = playingColor == "w" ? 0 : 1;
 191       let myReservePiecesArray = [];
 192       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 193         const qty = this.vr.reserve[playingColor][V.RESERVE_PIECES[i]];
 194         myReservePiecesArray.push(
 195           h(
 196             "div",
 197             {
 198               "class": { board: true, ["board" + sizeY]: true },
 199               attrs: { id: getSquareId({ x: sizeX + shiftIdx, y: i }) },
 200               style: { opacity: qty > 0 ? 1 : 0.35 }
 201             },
 202             [
 203               h("img", {
 204                 "class": { piece: true, reserve: true },
 205                 attrs: {
 206                   src:
 207                     "/images/pieces/" +
 208                     this.vr.getReservePpath(i, playingColor) +
 209                     ".svg"
 210                 }
 211               }),
 212               h("sup", { "class": { "reserve-count": true } }, [ qty ])
 213             ]
 214           )
 215         );
 216       }
 217       let oppReservePiecesArray = [];
 218       const oppCol = V.GetOppCol(playingColor);
 219       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 220         const qty = this.vr.reserve[oppCol][V.RESERVE_PIECES[i]];
 221         oppReservePiecesArray.push(
 222           h(
 223             "div",
 224             {
 225               "class": { board: true, ["board" + sizeY]: true },
 226               attrs: { id: getSquareId({ x: sizeX + (1 - shiftIdx), y: i }) },
 227               style: { opacity: qty > 0 ? 1 : 0.35 }
 228             },
 229             [
 230               h("img", {
 231                 "class": { piece: true, reserve: true },
 232                 attrs: {
 233                   src:
 234                     "/images/pieces/" +
 235                     this.vr.getReservePpath(i, oppCol) +
 236                     ".svg"
 237                 }
 238               }),
 239               h("sup", { "class": { "reserve-count": true } }, [ qty ])
 240             ]
 241           )
 242         );
 243       }
 244       const myReserveTop = (
 245         (playingColor == 'w' && orientation == 'b') ||
 246         (playingColor == 'b' && orientation == 'w')
 247       );
 248       // Center reserves, assuming same number of pieces for each side:
 249       const nbReservePieces = myReservePiecesArray.length;
 250       const marginLeft = ((100 - nbReservePieces * (100 / sizeY)) / 2) + "%";
 251       const reserveTop =
 252         h(
 253           "div",
 254           {
 255             "class": {
 256               game: true,
 257               "reserve-div": true
 258             },
 259             style: {
 260               "margin-left": marginLeft
 261             }
 262           },
 263           [
 264             h(
 265               "div",
 266               {
 267                 "class": {
 268                   row: true,
 269                   "reserve-row": true
 270                 }
 271               },
 272               myReserveTop ? myReservePiecesArray : oppReservePiecesArray
 273             )
 274           ]
 275         );
 276       var reserveBottom =
 277         h(
 278           "div",
 279           {
 280             "class": {
 281               game: true,
 282               "reserve-div": true
 283             },
 284             style: {
 285               "margin-left": marginLeft
 286             }
 287           },
 288           [
 289             h(
 290               "div",
 291               {
 292                 "class": {
 293                   row: true,
 294                   "reserve-row": true
 295                 }
 296               },
 297               myReserveTop ? oppReservePiecesArray : myReservePiecesArray
 298             )
 299           ]
 300         );
 301       elementArray.push(reserveTop);
 302     }
 303     elementArray.push(gameDiv);
 304     if (!!this.vr.reserve) elementArray.push(reserveBottom);
 305     const boardElt = document.querySelector(".game");
 306     if (this.choices.length > 0 && !!boardElt) {
 307       // No choices to show at first drawing
 308       const squareWidth = boardElt.offsetWidth / sizeY;
 309       const offset = [boardElt.offsetTop, boardElt.offsetLeft];
 310       const maxNbeltsPerRow = Math.min(this.choices.length, sizeY);
 311       let topOffset = offset[0] + (sizeY / 2) * squareWidth - squareWidth / 2;
 312       let choicesHeight = squareWidth;
 313       if (this.choices.length >= sizeY) {
 314         // A second row is required (Eightpieces variant)
 315         topOffset -= squareWidth / 2;
 316         choicesHeight *= 2;
 317       }
 318       const choices = h(
 319         "div",
 320         {
 321           attrs: { id: "choices" },
 322           "class": { row: true },
 323           style: {
 324             top: topOffset + "px",
 325             left:
 326               offset[1] +
 327               (squareWidth * Math.max(sizeY - this.choices.length, 0)) / 2 +
 328               "px",
 329             width: (maxNbeltsPerRow * squareWidth) + "px",
 330             height: choicesHeight + "px"
 331           }
 332         },
 333         [ h(
 334           "div",
 335           {
 336             "class": { "full-width": true }
 337           },
 338           this.choices.map(m => {
 339             // A "choice" is a move
 340             const applyMove = (e) => {
 341               e.stopPropagation();
 342               // Force a delay between move is shown and clicked
 343               // (otherwise a "double-click" bug might occur)
 344               if (Date.now() - this.clickTime < 200) return;
 345               this.choices = [];
 346               this.play(m);
 347             };
 348             const onClick =
 349               this.mobileBrowser
 350                 ? { touchend: applyMove }
 351                 : { mouseup: applyMove };
 352             return h(
 353               "div",
 354               {
 355                 "class": {
 356                   board: true,
 357                   ["board" + sizeY]: true
 358                 },
 359                 style: {
 360                   width: (100 / maxNbeltsPerRow) + "%",
 361                   "padding-bottom": (100 / maxNbeltsPerRow) + "%"
 362                 }
 363               },
 364               [
 365                 h("img", {
 366                   attrs: {
 367                     src:
 368                       "/images/pieces/" +
 369                       // orientation: extra arg useful for some variants:
 370                       this.vr.getPPpath(m, this.orientation) +
 371                       V.IMAGE_EXTENSION
 372                   },
 373                   "class": { "choice-piece": true },
 374                   on: onClick
 375                 })
 376               ]
 377             );
 378           })
 379         ) ]
 380       );
 381       elementArray.unshift(choices);
 382     }
 383     if (
 384       !this.mobileBrowser &&
 385       (this.arrows.length > 0 || this.movingArrow.x >= 0)
 386     ) {
 387       let svgArrows = [];
 388       this.arrows.forEach(a => {
 389         svgArrows.push(
 390           h(
 391             "path",
 392             {
 393               "class": { "svg-arrow": true },
 394               attrs: {
 395                 d: (
 396                   "M" + a.start.x + "," + a.start.y + " " +
 397                   "L" + a.end.x + "," + a.end.y
 398                 )
 399               }
 400             }
 401           )
 402         );
 403       });
 404       if (this.movingArrow.x >= 0) {
 405         svgArrows.push(
 406           h(
 407             "path",
 408             {
 409               "class": { "svg-arrow": true },
 410               attrs: {
 411                 d: (
 412                   "M" + this.startArrow.x + "," + this.startArrow.y + " " +
 413                   "L" + this.movingArrow.x + "," + this.movingArrow.y
 414                 )
 415               }
 416             }
 417           )
 418         );
 419       }
 420       // Add SVG element for drawing arrows
 421       elementArray.push(
 422         h(
 423           "svg",
 424           {
 425             attrs: {
 426               id: "arrowCanvas",
 427               stroke: "none"
 428             }
 429           },
 430           [
 431             h(
 432               "defs",
 433               {},
 434               [
 435                 h(
 436                   "marker",
 437                   {
 438                     attrs: {
 439                       id: "arrow",
 440                       markerWidth: "2",
 441                       markerHeight: "2",
 442                       markerUnits: "strokeWidth",
 443                       refX: "0",
 444                       refY: "1",
 445                       orient: "auto"
 446                     }
 447                   },
 448                   [
 449                     h(
 450                       "path",
 451                       {
 452                         attrs: {
 453                           d: "M0,0 L0,2 L2,1 z",
 454                           style: "fill: blue"
 455                         }
 456                       }
 457                     )
 458                   ]
 459                 )
 460               ]
 461             )
 462           ].concat(svgArrows)
 463         )
 464       );
 465     }
 466     let onEvents = {};
 467     // NOTE: click = mousedown + mouseup
 468     if (this.mobileBrowser) {
 469       onEvents = {
 470         on: {
 471           touchstart: this.mousedown,
 472           touchmove: this.mousemove,
 473           touchend: this.mouseup
 474         }
 475       };
 476     } else {
 477       onEvents = {
 478         on: {
 479           mousedown: this.mousedown,
 480           mousemove: this.mousemove,
 481           mouseup: this.mouseup,
 482           contextmenu: this.blockContextMenu
 483         }
 484       };
 485     }
 486     return h("div", onEvents, elementArray);
 487   },
 488   methods: {
 489     blockContextMenu: function(e) {
 490       e.preventDefault();
 491       e.stopPropagation();
 492       return false;
 493     },
 494     cancelResetArrows: function() {
 495       this.startArrow = null;
 496       this.arrows = [];
 497       this.circles = {};
 498     },
 499     mousedown: function(e) {
 500       if (!([1, 3].includes(e.which))) return;
 501       e.preventDefault();
 502       if (e.which != 3)
 503         // Cancel current drawing and circles, if any
 504         this.cancelResetArrows();
 505       if (e.which == 1 || this.mobileBrowser) {
 506         // Mouse left button
 507         if (!this.start) {
 508           // NOTE: classList[0] is enough: 'piece' is the first assigned class
 509           const withPiece = (e.target.classList[0] == "piece");
 510           // Emit the click event which could be used by some variants
 511           this.$emit(
 512             "click-square",
 513             getSquareFromId(withPiece ? e.target.parentNode.id : e.target.id)
 514           );
 515           // Start square must contain a piece.
 516           if (!withPiece) return;
 517           let parent = e.target.parentNode; //surrounding square
 518           // Show possible moves if current player allowed to play
 519           const startSquare = getSquareFromId(parent.id);
 520           this.possibleMoves = [];
 521           const color = this.analyze ? this.vr.turn : this.userColor;
 522           if (this.vr.canIplay(color, startSquare))
 523             this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 524           // For potential drag'n drop, remember start coordinates
 525           // (to center the piece on mouse cursor)
 526           const rect = parent.getBoundingClientRect();
 527           this.start = {
 528             x: rect.x + rect.width / 2,
 529             y: rect.y + rect.width / 2,
 530             id: parent.id
 531           };
 532           // Add the moving piece to the board, just after current image
 533           this.selectedPiece = e.target.cloneNode();
 534           Object.assign(
 535             this.selectedPiece.style,
 536             {
 537               position: "absolute",
 538               top: 0,
 539               display: "inline-block",
 540               zIndex: 3000
 541             }
 542           );
 543           parent.insertBefore(this.selectedPiece, e.target.nextSibling);
 544         } else {
 545           this.processMoveAttempt(e);
 546         }
 547       } else {
 548         // e.which == 3 : mouse right button
 549         let elem = e.target;
 550         // Next loop because of potential marks
 551         while (elem.tagName == "IMG") elem = elem.parentNode;
 552         // To center the arrow in square:
 553         const rect = elem.getBoundingClientRect();
 554         this.startArrow = {
 555           x: rect.x + rect.width / 2,
 556           y: rect.y + rect.width / 2,
 557           id: elem.id
 558         };
 559       }
 560     },
 561     mousemove: function(e) {
 562       if (!this.selectedPiece && !this.startArrow) return;
 563       e.preventDefault();
 564       if (!!this.selectedPiece) {
 565         // There is an active element: move it around
 566         const [offsetX, offsetY] =
 567           this.mobileBrowser
 568             ? [e.changedTouches[0].pageX, e.changedTouches[0].pageY]
 569             : [e.clientX, e.clientY];
 570         Object.assign(
 571           this.selectedPiece.style,
 572           {
 573             left: offsetX - this.start.x + "px",
 574             top: offsetY - this.start.y + "px"
 575           }
 576         );
 577       }
 578       else {
 579         let elem = e.target;
 580         // Next loop because of potential marks
 581         while (elem.tagName == "IMG") elem = elem.parentNode;
 582         // To center the arrow in square:
 583         if (elem.id != this.startArrow.id) {
 584           const rect = elem.getBoundingClientRect();
 585           this.movingArrow = {
 586             x: rect.x + rect.width / 2,
 587             y: rect.y + rect.width / 2
 588           };
 589         }
 590       }
 591     },
 592     mouseup: function(e) {
 593       if (!([1, 3].includes(e.which))) return;
 594       e.preventDefault();
 595       if (e.which == 1) {
 596         if (!this.selectedPiece) return;
 597         // Drag'n drop. Selected piece is no longer needed:
 598         this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 599         delete this.selectedPiece;
 600         this.selectedPiece = null;
 601         this.processMoveAttempt(e);
 602       } else {
 603         // Mouse right button (e.which == 3)
 604         this.movingArrow = { x: -1, y: -1 };
 605         this.processArrowAttempt(e);
 606       }
 607     },
 608     processMoveAttempt: function(e) {
 609       // Obtain the move from start and end squares
 610       const [offsetX, offsetY] =
 611         this.mobileBrowser
 612           ? [e.changedTouches[0].pageX, e.changedTouches[0].pageY]
 613           : [e.clientX, e.clientY];
 614       let landing = document.elementFromPoint(offsetX, offsetY);
 615       // Next condition: classList.contains(piece) fails because of marks
 616       while (landing.tagName == "IMG") landing = landing.parentNode;
 617       if (this.start.id == landing.id) {
 618         if (this.click == landing.id) {
 619           // Second click on same square: cancel current move
 620           this.possibleMoves = [];
 621           this.start = null;
 622           this.click = "";
 623         } else this.click = landing.id;
 624         return;
 625       }
 626       this.start = null;
 627       // OK: process move attempt, landing is a square node
 628       let endSquare = getSquareFromId(landing.id);
 629       let moves = this.findMatchingMoves(endSquare);
 630       this.possibleMoves = [];
 631       if (moves.length > 1) {
 632         this.clickTime = Date.now();
 633         this.choices = moves;
 634       } else if (moves.length == 1) this.play(moves[0]);
 635       // else: forbidden move attempt
 636     },
 637     processArrowAttempt: function(e) {
 638       // Obtain the arrow from start and end squares
 639       const [offsetX, offsetY] = [e.clientX, e.clientY];
 640       let landing = document.elementFromPoint(offsetX, offsetY);
 641       // Next condition: classList.contains(piece) fails because of marks
 642       while (landing.tagName == "IMG") landing = landing.parentNode;
 643       if (this.startArrow.id == landing.id)
 644         // Draw (or erase) a circle
 645         this.$set(this.circles, landing.id, !this.circles[landing.id]);
 646       else {
 647         // OK: add arrow, landing is a new square
 648         const rect = landing.getBoundingClientRect();
 649         this.arrows.push({
 650           start: {
 651             x: this.startArrow.x,
 652             y: this.startArrow.y
 653           },
 654           end: {
 655             x: rect.x + rect.width / 2,
 656             y: rect.y + rect.width / 2
 657           }
 658         });
 659       }
 660       this.startArrow = null;
 661     },
 662     findMatchingMoves: function(endSquare) {
 663       // Run through moves list and return the matching set (if promotions...)
 664       return (
 665         this.possibleMoves.filter(m => {
 666           return (endSquare[0] == m.end.x && endSquare[1] == m.end.y);
 667         })
 668       );
 669     },
 670     play: function(move) {
 671       this.$emit("play-move", move);
 672     }
 673   }
 674 };
 675 </script>
 676
 677 <style lang="sass" scoped>
 678 // NOTE: no variants with reserve of size != 8
 679 .game.reserve-div
 680   margin-bottom: 18px
 681 .reserve-count
 682   padding-left: 40%
 683 .reserve-row
 684   margin-bottom: 15px
 685
 686 .full-width
 687   width: 100%
 688
 689 .game
 690   user-select: none
 691   width: 100%
 692   margin: 0
 693   .board
 694     cursor: pointer
 695
 696 #choices
 697   user-select: none
 698   margin: 0
 699   position: absolute
 700   z-index: 300
 701   overflow-y: inherit
 702   background-color: rgba(0,0,0,0)
 703   img
 704     cursor: pointer
 705     background-color: #e6ee9c
 706     &:hover
 707       background-color: skyblue
 708     &.choice-piece
 709       width: 100%
 710       height: auto
 711       display: block
 712
 713 img.ghost
 714   position: absolute
 715   opacity: 0.5
 716   top: 0
 717
 718 #arrowCanvas
 719   pointer-events: none
 720   position: absolute
 721   top: 0
 722   left: 0
 723   width: 100%
 724   height: 100%
 725
 726 .svg-arrow
 727   opacity: 0.65
 728   stroke: #5f0e78
 729   stroke-width: 10px
 730   fill: none
 731   marker-end: url(#arrow)
 732
 733 .incheck-light
 734   background-color: rgba(204, 51, 0, 0.7) !important
 735 .incheck-dark
 736   background-color: rgba(204, 51, 0, 0.9) !important
 737
 738 .light-square.lichess
 739   background-color: #f0d9b5;
 740 .dark-square.lichess
 741   background-color: #b58863;
 742
 743 .light-square.chesscom
 744   background-color: #e5e5ca;
 745 .dark-square.chesscom
 746   background-color: #6f8f57;
 747
 748 .light-square.chesstempo
 749   background-color: #dfdfdf;
 750 .dark-square.chesstempo
 751   background-color: #7287b6;
 752
 753 // TODO: no predefined highlight colors, but layers. How?
 754
 755 .light-square.lichess.highlight-light
 756   background-color: #cdd26a
 757 .dark-square.lichess.highlight-dark
 758   background-color: #aaa23a
 759
 760 .light-square.chesscom.highlight-light
 761   background-color: #f7f783
 762 .dark-square.chesscom.highlight-dark
 763   background-color: #bacb44
 764
 765 .light-square.chesstempo.highlight-light
 766   background-color: #9f9fff
 767 .dark-square.chesstempo.highlight-dark
 768   background-color: #557fff
 769
 770 </style>