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       containerPos: null,
  26       selectedPiece: null, //moving piece (or clicked piece)
  27       start: null, //pixels coordinates + id of starting square (click or drag)
  28       startArrow: null,
  29       movingArrow: null,
  30       arrows: [], //object of {start: x,y / end: x,y}
  31       circles: {}, //object of squares' ID --> true (TODO: use a set?)
  32       click: "",
  33       clickTime: 0,
  34       settings: store.state.settings
  35     };
  36   },
  37   render(h) {
  38     if (!this.vr) {
  39       // Return empty div of class 'game' to avoid error when setting size
  40       return h(
  41         "div",
  42         { "class": { game: true } }
  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     let lm = this.lastMove;
  58     // Precompute lastMove highlighting squares
  59     const lmHighlights = {};
  60     if (!!lm) {
  61       if (!Array.isArray(lm)) lm = [lm];
  62       lm.forEach(m => {
  63         if (V.OnBoard(m.start.x, m.start.y))
  64           lmHighlights[m.start.x + sizeX * m.start.y] = true;
  65         if (V.OnBoard(m.end.x, m.end.y))
  66           lmHighlights[m.end.x + sizeX * m.end.y] = true;
  67       });
  68     }
  69     const showLight = (
  70       this.settings.highlight &&
  71       ["all", "highlight"].includes(V.ShowMoves)
  72     );
  73     const showCheck = (
  74       this.settings.highlight &&
  75       ["all", "highlight", "byrow"].includes(V.ShowMoves)
  76     );
  77     const orientation = !V.CanFlip ? "w" : this.orientation;
  78     // Ensure that squares colors do not change when board is flipped
  79     const lightSquareMod = (sizeX + sizeY) % 2;
  80     const showPiece = (x, y) => {
  81       return (
  82         this.vr.board[x][y] != V.EMPTY &&
  83         (!this.vr.enlightened || this.analyze || this.score != "*" ||
  84           (!!this.userColor && this.vr.enlightened[this.userColor][x][y]))
  85       );
  86     };
  87     const inHighlight = (x, y) => {
  88       return showLight && !!lmHighlights[x + sizeX * y];
  89     };
  90     const inShadow = (x, y) => {
  91       return (
  92         !this.analyze &&
  93         this.score == "*" &&
  94         this.vr.enlightened &&
  95         (!this.userColor || !this.vr.enlightened[this.userColor][x][y])
  96       );
  97     };
  98     // Create board element (+ reserves if needed by variant)
  99     let elementArray = [];
 100     const gameDiv = h(
 101       "div",
 102       {
 103         attrs: { id: "gamePosition" },
 104         "class": {
 105           game: true,
 106           clearer: true
 107         }
 108       },
 109       [...Array(sizeX).keys()].map(i => {
 110         const ci = orientation == "w" ? i : sizeX - i - 1;
 111         return h(
 112           "div",
 113           {
 114             "class": {
 115               row: true
 116             },
 117             style: { opacity: this.choices.length > 0 ? "0.5" : "1" }
 118           },
 119           [...Array(sizeY).keys()].map(j => {
 120             const cj = orientation == "w" ? j : sizeY - j - 1;
 121             const squareId = "sq-" + ci + "-" + cj;
 122             let elems = [];
 123             if (showPiece(ci, cj)) {
 124               let pieceSpecs = {
 125                 "class": {
 126                   piece: true,
 127                   ghost:
 128                     !!this.selectedPiece &&
 129                     this.selectedPiece.parentNode.id == squareId
 130                 },
 131                 attrs: {
 132                   src:
 133                     "/images/pieces/" +
 134                     this.vr.getPpath(
 135                       this.vr.board[ci][cj],
 136                       // Extra args useful for some variants:
 137                       this.userColor,
 138                       this.score,
 139                       this.orientation) +
 140                     V.IMAGE_EXTENSION
 141                 }
 142               };
 143               if (this.arrows.length == 0)
 144                 pieceSpecs["style"] = { position: "absolute" };
 145               elems.push(h("img", pieceSpecs));
 146             }
 147             if (this.settings.hints && hintSquares[ci][cj]) {
 148               elems.push(
 149                 h("img", {
 150                   "class": {
 151                     "mark-square": true
 152                   },
 153                   attrs: {
 154                     src: "/images/mark.svg"
 155                   }
 156                 })
 157               );
 158             }
 159             if (!!this.circles[squareId]) {
 160               elems.push(
 161                 h("img", {
 162                   "class": {
 163                     "circle-square": true
 164                   },
 165                   attrs: {
 166                     src: "/images/circle.svg"
 167                   }
 168                 })
 169               );
 170             }
 171             const lightSquare = (ci + cj) % 2 == lightSquareMod;
 172             return h(
 173               "div",
 174               {
 175                 "class": {
 176                   board: true,
 177                   ["board" + sizeY]: true,
 178                   "light-square":
 179                     !V.Notoodark && lightSquare && !V.Monochrome,
 180                   "dark-square":
 181                     !V.Notoodark && (!lightSquare || !!V.Monochrome),
 182                   "middle-square": V.Notoodark,
 183                   [this.settings.bcolor]: true,
 184                   "in-shadow": inShadow(ci, cj),
 185                   "highlight-light": inHighlight(ci, cj) && lightSquare,
 186                   "highlight-dark":
 187                     inHighlight(ci, cj) && (V.Monochrome || !lightSquare),
 188                   "incheck-light":
 189                     showCheck && lightSquare && incheckSq[ci][cj],
 190                   "incheck-dark":
 191                     showCheck && !lightSquare && incheckSq[ci][cj],
 192                   "hover-highlight": this.vr.hoverHighlight(ci, cj)
 193                 },
 194                 attrs: {
 195                   id: getSquareId({ x: ci, y: cj })
 196                 }
 197               },
 198               elems
 199             );
 200           })
 201         );
 202       })
 203     );
 204     if (!!this.vr.reserve) {
 205       const playingColor = this.userColor || "w"; //default for an observer
 206       const shiftIdx = playingColor == "w" ? 0 : 1;
 207       // Some variants have more than sizeY reserve pieces (Clorange: 10)
 208       const reserveSquareNb = Math.max(sizeY, V.RESERVE_PIECES.length);
 209       let myReservePiecesArray = [];
 210       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 211         const qty = this.vr.reserve[playingColor][V.RESERVE_PIECES[i]];
 212         myReservePiecesArray.push(
 213           h(
 214             "div",
 215             {
 216               "class": { board: true, ["board" + reserveSquareNb]: true },
 217               attrs: { id: getSquareId({ x: sizeX + shiftIdx, y: i }) },
 218               style: { opacity: qty > 0 ? 1 : 0.35 }
 219             },
 220             [
 221               h("img", {
 222                 // NOTE: class "reserve" not used currently
 223                 "class": { piece: true, reserve: true },
 224                 attrs: {
 225                   src:
 226                     "/images/pieces/" +
 227                     this.vr.getReservePpath(i, playingColor, orientation) +
 228                     ".svg"
 229                 }
 230               }),
 231               h(
 232                 "sup",
 233                 {
 234                   "class": { "reserve-count": true },
 235                   style: { top: "calc(100% + 5px)" }
 236                 },
 237                 [ qty ]
 238               )
 239             ]
 240           )
 241         );
 242       }
 243       let oppReservePiecesArray = [];
 244       const oppCol = V.GetOppCol(playingColor);
 245       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 246         const qty = this.vr.reserve[oppCol][V.RESERVE_PIECES[i]];
 247         oppReservePiecesArray.push(
 248           h(
 249             "div",
 250             {
 251               "class": { board: true, ["board" + reserveSquareNb]: true },
 252               attrs: { id: getSquareId({ x: sizeX + (1 - shiftIdx), y: i }) },
 253               style: { opacity: qty > 0 ? 1 : 0.35 }
 254             },
 255             [
 256               h("img", {
 257                 "class": { piece: true, reserve: true },
 258                 attrs: {
 259                   src:
 260                     "/images/pieces/" +
 261                     this.vr.getReservePpath(i, oppCol, orientation) +
 262                     ".svg"
 263                 }
 264               }),
 265               h(
 266                 "sup",
 267                 {
 268                   "class": { "reserve-count": true },
 269                   style: { top: "calc(100% + 5px)" }
 270                 },
 271                 [ qty ]
 272               )
 273             ]
 274           )
 275         );
 276       }
 277       const myReserveTop = (
 278         (playingColor == 'w' && orientation == 'b') ||
 279         (playingColor == 'b' && orientation == 'w')
 280       );
 281       // Center reserves, assuming same number of pieces for each side:
 282       const nbReservePieces = myReservePiecesArray.length;
 283       const marginLeft =
 284         ((100 - nbReservePieces * (100 / reserveSquareNb)) / 2) + "%";
 285       const reserveTop =
 286         h(
 287           "div",
 288           {
 289             "class": {
 290               game: true,
 291               "reserve-div": true
 292             },
 293             style: {
 294               "margin-left": marginLeft
 295             }
 296           },
 297           [
 298             h(
 299               "div",
 300               {
 301                 "class": {
 302                   row: true,
 303                   "reserve-row": true
 304                 }
 305               },
 306               myReserveTop ? myReservePiecesArray : oppReservePiecesArray
 307             )
 308           ]
 309         );
 310       var reserveBottom =
 311         h(
 312           "div",
 313           {
 314             "class": {
 315               game: true,
 316               "reserve-div": true
 317             },
 318             style: {
 319               "margin-left": marginLeft
 320             }
 321           },
 322           [
 323             h(
 324               "div",
 325               {
 326                 "class": {
 327                   row: true,
 328                   "reserve-row": true
 329                 }
 330               },
 331               myReserveTop ? oppReservePiecesArray : myReservePiecesArray
 332             )
 333           ]
 334         );
 335       elementArray.push(reserveTop);
 336     }
 337     elementArray.push(gameDiv);
 338     if (!!this.vr.reserve) elementArray.push(reserveBottom);
 339     const boardElt = document.getElementById("gamePosition");
 340     // boardElt might be undefine (at first drawing)
 341     if (this.choices.length > 0 && !!boardElt) {
 342       const squareWidth = boardElt.offsetWidth / sizeY;
 343       const offset = [boardElt.offsetTop, boardElt.offsetLeft];
 344       const maxNbeltsPerRow = Math.min(this.choices.length, sizeY);
 345       let topOffset = offset[0] + (sizeY / 2) * squareWidth - squareWidth / 2;
 346       let choicesHeight = squareWidth;
 347       if (this.choices.length >= sizeY) {
 348         // A second row is required (Eightpieces variant)
 349         topOffset -= squareWidth / 2;
 350         choicesHeight *= 2;
 351       }
 352       const choices = h(
 353         "div",
 354         {
 355           attrs: { id: "choices" },
 356           "class": { row: true },
 357           style: {
 358             top: topOffset + "px",
 359             left:
 360               offset[1] +
 361               (squareWidth * Math.max(sizeY - this.choices.length, 0)) / 2 +
 362               "px",
 363             width: (maxNbeltsPerRow * squareWidth) + "px",
 364             height: choicesHeight + "px"
 365           }
 366         },
 367         [ h(
 368           "div",
 369           {
 370             "class": { "full-width": true }
 371           },
 372           this.choices.map(m => {
 373             // A "choice" is a move
 374             const applyMove = (e) => {
 375               e.stopPropagation();
 376               // Force a delay between move is shown and clicked
 377               // (otherwise a "double-click" bug might occur)
 378               if (Date.now() - this.clickTime < 200) return;
 379               this.choices = [];
 380               this.play(m);
 381             };
 382             const onClick =
 383               this.mobileBrowser
 384                 ? { touchend: applyMove }
 385                 : { mouseup: applyMove };
 386             return h(
 387               "div",
 388               {
 389                 "class": {
 390                   board: true,
 391                   ["board" + sizeY]: true
 392                 },
 393                 style: {
 394                   width: (100 / maxNbeltsPerRow) + "%",
 395                   "padding-bottom": (100 / maxNbeltsPerRow) + "%"
 396                 }
 397               },
 398               [
 399                 h("img", {
 400                   attrs: {
 401                     src:
 402                       "/images/pieces/" +
 403                       // orientation: extra arg useful for some variants:
 404                       this.vr.getPPpath(m, this.orientation) +
 405                       V.IMAGE_EXTENSION
 406                   },
 407                   "class": { "choice-piece": true },
 408                   on: onClick
 409                 })
 410               ]
 411             );
 412           })
 413         ) ]
 414       );
 415       elementArray.unshift(choices);
 416     }
 417     let onEvents = {};
 418     // NOTE: click = mousedown + mouseup
 419     if (this.mobileBrowser) {
 420       onEvents = {
 421         on: {
 422           touchstart: this.mousedown,
 423           touchmove: this.mousemove,
 424           touchend: this.mouseup
 425         }
 426       };
 427     } else {
 428       onEvents = {
 429         on: {
 430           mousedown: this.mousedown,
 431           mousemove: this.mousemove,
 432           mouseup: this.mouseup,
 433           contextmenu: this.blockContextMenu
 434         }
 435       };
 436     }
 437     return (
 438       h(
 439         "div",
 440         Object.assign({ attrs: { id: "rootBoardElement" } }, onEvents),
 441         elementArray
 442       )
 443     );
 444   },
 445   updated: function() {
 446     this.re_setDrawings();
 447   },
 448   methods: {
 449     blockContextMenu: function(e) {
 450       e.preventDefault();
 451       e.stopPropagation();
 452       return false;
 453     },
 454     cancelResetArrows: function() {
 455       this.startArrow = null;
 456       this.arrows = [];
 457       this.circles = {};
 458       const curCanvas = document.getElementById("arrowCanvas");
 459       if (!!curCanvas) curCanvas.parentNode.removeChild(curCanvas);
 460     },
 461     coordsToXY: function(coords, top, left, squareWidth) {
 462       return {
 463         // [1] for x and [0] for y because conventions in rules are inversed.
 464         x: (
 465           left + window.scrollX +
 466           (
 467             squareWidth *
 468             (this.orientation == 'w' ? coords[1] : (V.size.y - coords[1]))
 469           )
 470         ),
 471         y: (
 472           top + window.scrollY +
 473           (
 474             squareWidth *
 475             (this.orientation == 'w' ? coords[0] : (V.size.x - coords[0]))
 476           )
 477         )
 478       };
 479     },
 480     computeEndArrow: function(start, end, top, left, squareWidth) {
 481       const endCoords = this.coordsToXY(end, top, left, squareWidth);
 482       const delta = [endCoords.x - start.x, endCoords.y - start.y];
 483       const dist = Math.sqrt(delta[0] * delta[0] + delta[1] * delta[1]);
 484       // Simple heuristic for now, just remove 1/3 square.
 485       // TODO: should depend on the orientation.
 486       const fracSqWidth = squareWidth / 3;
 487       return {
 488         x: endCoords.x - delta[0] * fracSqWidth / dist,
 489         y: endCoords.y - delta[1] * fracSqWidth / dist
 490       };
 491     },
 492     drawCurrentArrow: function() {
 493       const boardElt = document.getElementById("gamePosition");
 494       const squareWidth = boardElt.offsetWidth / V.size.y;
 495       const bPos = boardElt.getBoundingClientRect();
 496       const aStart =
 497         this.coordsToXY(
 498           [this.startArrow[0] + 0.5, this.startArrow[1] + 0.5],
 499           bPos.top, bPos.left, squareWidth);
 500       const aEnd =
 501         this.computeEndArrow(
 502           aStart, [this.movingArrow[0] + 0.5, this.movingArrow[1] + 0.5],
 503           bPos.top, bPos.left, squareWidth);
 504       let currentArrow = document.getElementById("currentArrow");
 505       const d =
 506         "M" + aStart.x + "," + aStart.y + " " + "L" + aEnd.x + "," + aEnd.y;
 507       const arrowWidth = squareWidth / 4;
 508       if (!!currentArrow) currentArrow.setAttribute("d", d);
 509       else {
 510         let domArrow =
 511           document.createElementNS("http://www.w3.org/2000/svg", "path");
 512         domArrow.classList.add("svg-arrow");
 513         domArrow.id = "currentArrow";
 514         domArrow.setAttribute("d", d);
 515         domArrow.style = "stroke-width:" + arrowWidth + "px";
 516         document.getElementById("arrowCanvas")
 517           .insertAdjacentElement("beforeend", domArrow);
 518       }
 519     },
 520     addArrow: function(arrow) {
 521       this.arrows.push(arrow);
 522       // Also add to DOM:
 523       const boardElt = document.getElementById("gamePosition");
 524       const squareWidth = boardElt.offsetWidth / V.size.y;
 525       const bPos = boardElt.getBoundingClientRect();
 526       const newArrow =
 527         this.getSvgArrow(arrow, bPos.top, bPos.left, squareWidth);
 528       document.getElementById("arrowCanvas")
 529         .insertAdjacentElement("beforeend", newArrow);
 530     },
 531     getSvgArrow: function(arrow, top, left, squareWidth) {
 532       const aStart =
 533         this.coordsToXY(
 534           [arrow.start[0] + 0.5, arrow.start[1] + 0.5],
 535           top, left, squareWidth);
 536       const aEnd =
 537         this.computeEndArrow(
 538           aStart, [arrow.end[0] + 0.5, arrow.end[1] + 0.5],
 539           top, left, squareWidth);
 540       const arrowWidth = squareWidth / 4;
 541       let path =
 542         document.createElementNS("http://www.w3.org/2000/svg", "path");
 543       path.classList.add("svg-arrow");
 544       path.setAttribute(
 545         "d",
 546         "M" + aStart.x + "," + aStart.y + " " + "L" + aEnd.x + "," + aEnd.y
 547       );
 548       path.style = "stroke-width:" + arrowWidth + "px";
 549       return path;
 550     },
 551     re_setDrawings: function() {
 552       // Remove current canvas, if any
 553       const curCanvas = document.getElementById("arrowCanvas");
 554       if (!!curCanvas) curCanvas.parentNode.removeChild(curCanvas);
 555       // Add some drawing on board (for some variants + arrows and circles)
 556       const boardElt = document.getElementById("gamePosition");
 557       const squareWidth = boardElt.offsetWidth / V.size.y;
 558       const bPos = boardElt.getBoundingClientRect();
 559       let svgArrows = [];
 560       this.arrows.forEach(a => {
 561         svgArrows.push(this.getSvgArrow(a, bPos.top, bPos.left, squareWidth));
 562       });
 563       let vLines = [];
 564       if (!!V.Lines) {
 565         V.Lines.forEach(line => {
 566           const lStart =
 567             this.coordsToXY(line[0], bPos.top, bPos.left, squareWidth);
 568           const lEnd =
 569             this.coordsToXY(line[1], bPos.top, bPos.left, squareWidth);
 570           let path =
 571             document.createElementNS("http://www.w3.org/2000/svg", "path");
 572           if (line[0][0] == line[1][0] || line[0][1] == line[1][1])
 573             path.classList.add("svg-line");
 574           else
 575             // "Diagonals" are drawn with a lighter color (TODO: generalize)
 576             path.classList.add("svg-diag");
 577           path.setAttribute(
 578             "d",
 579             "M" + lStart.x + "," + lStart.y + " " +
 580               "L" + lEnd.x + "," + lEnd.y
 581           );
 582           vLines.push(path);
 583         });
 584       }
 585       let arrowCanvas =
 586         document.createElementNS("http://www.w3.org/2000/svg", "svg");
 587       arrowCanvas.id = "arrowCanvas";
 588       arrowCanvas.setAttribute("stroke", "none");
 589       let defs =
 590         document.createElementNS("http://www.w3.org/2000/svg", "defs");
 591       const arrowWidth = squareWidth / 4;
 592       let marker =
 593         document.createElementNS("http://www.w3.org/2000/svg", "marker");
 594       marker.id = "arrow";
 595       marker.setAttribute("markerWidth", (2 * arrowWidth) + "px");
 596       marker.setAttribute("markerHeight", (3 * arrowWidth) + "px");
 597       marker.setAttribute("markerUnits", "userSpaceOnUse");
 598       marker.setAttribute("refX", "0");
 599       marker.setAttribute("refY", (1.5 * arrowWidth) + "px");
 600       marker.setAttribute("orient", "auto");
 601       let head =
 602         document.createElementNS("http://www.w3.org/2000/svg", "path");
 603       head.classList.add("arrow-head");
 604       head.setAttribute(
 605         "d",
 606         "M0,0 L0," + (3 * arrowWidth) + " L" +
 607           (2 * arrowWidth) + "," + (1.5 * arrowWidth) + " z"
 608       );
 609       marker.appendChild(head);
 610       defs.appendChild(marker);
 611       arrowCanvas.appendChild(defs);
 612       svgArrows.concat(vLines).forEach(av => arrowCanvas.appendChild(av));
 613       document.getElementById("rootBoardElement").appendChild(arrowCanvas);
 614     },
 615     mousedown: function(e) {
 616       e.preventDefault();
 617       if (!this.mobileBrowser && e.which != 3)
 618         // Cancel current drawing and circles, if any
 619         this.cancelResetArrows();
 620       if (this.mobileBrowser || e.which == 1) {
 621         // Mouse left button
 622         if (!this.start) {
 623           this.containerPos =
 624             document.getElementById("boardContainer").getBoundingClientRect();
 625           // NOTE: classList[0] is enough: 'piece' is the first assigned class
 626           const withPiece = (e.target.classList[0] == "piece");
 627           // Emit the click event which could be used by some variants
 628           this.$emit(
 629             "click-square",
 630             getSquareFromId(withPiece ? e.target.parentNode.id : e.target.id)
 631           );
 632           // Start square must contain a piece.
 633           if (!withPiece) return;
 634           let parent = e.target.parentNode; //surrounding square
 635           // Show possible moves if current player allowed to play
 636           const startSquare = getSquareFromId(parent.id);
 637           this.possibleMoves = [];
 638           const color = this.analyze ? this.vr.turn : this.userColor;
 639           if (this.vr.canIplay(color, startSquare))
 640             this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 641           // For potential drag'n drop, remember start coordinates
 642           // (to center the piece on mouse cursor)
 643           const rect = parent.getBoundingClientRect();
 644           this.start = {
 645             x: rect.x + rect.width / 2,
 646             y: rect.y + rect.width / 2,
 647             id: parent.id
 648           };
 649           // Add the moving piece to the board, just after current image
 650           this.selectedPiece = e.target.cloneNode();
 651           Object.assign(
 652             this.selectedPiece.style,
 653             {
 654               position: "absolute",
 655               top: 0,
 656               display: "inline-block",
 657               zIndex: 3000
 658             }
 659           );
 660           parent.insertBefore(this.selectedPiece, e.target.nextSibling);
 661         } else {
 662           this.processMoveAttempt(e);
 663         }
 664       } else if (e.which == 3) {
 665         // Mouse right button
 666         this.containerPos =
 667           document.getElementById("gamePosition").getBoundingClientRect();
 668         let elem = e.target;
 669         // Next loop because of potential marks
 670         while (elem.tagName == "IMG") elem = elem.parentNode;
 671         this.startArrow = getSquareFromId(elem.id);
 672       }
 673     },
 674     mousemove: function(e) {
 675       if (!this.selectedPiece && !this.startArrow) return;
 676       // Cancel if off boardContainer
 677       const [offsetX, offsetY] =
 678         this.mobileBrowser
 679           ? [e.changedTouches[0].clientX, e.changedTouches[0].clientY]
 680           : [e.clientX, e.clientY];
 681       if (
 682         offsetX < this.containerPos.left ||
 683         offsetX > this.containerPos.right ||
 684         offsetY < this.containerPos.top ||
 685         offsetY > this.containerPos.bottom
 686       ) {
 687         if (!!this.selectedPiece) {
 688           this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 689           delete this.selectedPiece;
 690           this.selectedPiece = null;
 691           this.start = null;
 692           this.possibleMoves = []; //in case of
 693           this.click = "";
 694           let selected = document.querySelector(".ghost");
 695           if (!!selected) selected.classList.remove("ghost");
 696         }
 697         else {
 698           this.startArrow = null;
 699           this.movingArrow = null;
 700           const currentArrow = document.getElementById("currentArrow");
 701           if (!!currentArrow)
 702             currentArrow.parentNode.removeChild(currentArrow);
 703         }
 704         return;
 705       }
 706       e.preventDefault();
 707       if (!!this.selectedPiece) {
 708         // There is an active element: move it around
 709         Object.assign(
 710           this.selectedPiece.style,
 711           {
 712             left: offsetX - this.start.x + "px",
 713             top: offsetY - this.start.y + "px"
 714           }
 715         );
 716       }
 717       else {
 718         let elem = e.target;
 719         // Next loop because of potential marks
 720         while (elem.tagName == "IMG") elem = elem.parentNode;
 721         // To center the arrow in square:
 722         const movingCoords = getSquareFromId(elem.id);
 723         if (
 724           movingCoords[0] != this.startArrow[0] ||
 725           movingCoords[1] != this.startArrow[1]
 726         ) {
 727           this.movingArrow = movingCoords;
 728           this.drawCurrentArrow();
 729         }
 730       }
 731     },
 732     mouseup: function(e) {
 733       e.preventDefault();
 734       if (this.mobileBrowser || e.which == 1) {
 735         if (!this.selectedPiece) return;
 736         // Drag'n drop. Selected piece is no longer needed:
 737         this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 738         delete this.selectedPiece;
 739         this.selectedPiece = null;
 740         this.processMoveAttempt(e);
 741       } else if (e.which == 3) {
 742         if (!this.startArrow) return;
 743         // Mouse right button
 744         this.movingArrow = null;
 745         this.processArrowAttempt(e);
 746       }
 747     },
 748     // Called by BaseGame after partially undoing multi-moves:
 749     resetCurrentAttempt: function() {
 750       this.possibleMoves = [];
 751       this.start = null;
 752       this.click = "";
 753       this.selectedPiece = null;
 754     },
 755     processMoveAttempt: function(e) {
 756       // Obtain the move from start and end squares
 757       const [offsetX, offsetY] =
 758         this.mobileBrowser
 759           ? [e.changedTouches[0].clientX, e.changedTouches[0].clientY]
 760           : [e.clientX, e.clientY];
 761       let landing = document.elementFromPoint(offsetX, offsetY);
 762       // Next condition: classList.contains(piece) fails because of marks
 763       while (landing.tagName == "IMG") landing = landing.parentNode;
 764       if (this.start.id == landing.id) {
 765         if (this.click == landing.id) {
 766           // Second click on same square: cancel current move
 767           this.possibleMoves = [];
 768           this.start = null;
 769           this.click = "";
 770         } else this.click = landing.id;
 771         return;
 772       }
 773       this.start = null;
 774       // OK: process move attempt, landing is a square node
 775       let endSquare = getSquareFromId(landing.id);
 776       let moves = this.findMatchingMoves(endSquare);
 777       this.possibleMoves = [];
 778       if (moves.length > 1) {
 779         this.clickTime = Date.now();
 780         this.choices = moves;
 781       } else if (moves.length == 1) this.play(moves[0]);
 782       // else: forbidden move attempt
 783     },
 784     processArrowAttempt: function(e) {
 785       // Obtain the arrow from start and end squares
 786       const [offsetX, offsetY] = [e.clientX, e.clientY];
 787       let landing = document.elementFromPoint(offsetX, offsetY);
 788       // Next condition: classList.contains(piece) fails because of marks
 789       while (landing.tagName == "IMG") landing = landing.parentNode;
 790       const landingCoords = getSquareFromId(landing.id);
 791       if (
 792         this.startArrow[0] == landingCoords[0] &&
 793         this.startArrow[1] == landingCoords[1]
 794       ) {
 795         // Draw (or erase) a circle
 796         this.$set(this.circles, landing.id, !this.circles[landing.id]);
 797       }
 798       else {
 799         // OK: add arrow, landing is a new square
 800         const currentArrow = document.getElementById("currentArrow");
 801         currentArrow.parentNode.removeChild(currentArrow);
 802         this.addArrow({
 803           start: this.startArrow,
 804           end: landingCoords
 805         });
 806       }
 807       this.startArrow = null;
 808     },
 809     findMatchingMoves: function(endSquare) {
 810       // Run through moves list and return the matching set (if promotions...)
 811       return (
 812         this.possibleMoves.filter(m => {
 813           return (endSquare[0] == m.end.x && endSquare[1] == m.end.y);
 814         })
 815       );
 816     },
 817     play: function(move) {
 818       this.$emit("play-move", move);
 819     }
 820   }
 821 };
 822 </script>
 823
 824 <style lang="sass">
 825 // SVG dynamically added, so not scoped
 826 #arrowCanvas
 827   pointer-events: none
 828   position: absolute
 829   top: 0
 830   left: 0
 831   width: 100%
 832   height: 100%
 833
 834 .svg-arrow
 835   opacity: 0.65
 836   stroke: #5f0e78
 837   fill: none
 838   marker-end: url(#arrow)
 839
 840 .svg-line
 841   stroke: black
 842
 843 .svg-diag
 844   stroke: grey
 845
 846 .arrow-head
 847   fill: #5f0e78
 848 </style>
 849
 850 <style lang="sass" scoped>
 851 @import "@/styles/_board_squares_img.sass";
 852
 853 //.game.reserve-div
 854   // TODO: would be cleaner to restrict width so that it doesn't overflow
 855   // Commented out because pieces would disappear over the board otherwise:
 856   //overflow: hidden
 857 .reserve-count
 858   width: 100%
 859   text-align: center
 860   display: inline-block
 861   position: absolute
 862 .reserve-row
 863   margin-bottom: 15px
 864
 865 .full-width
 866   width: 100%
 867
 868 .game
 869   user-select: none
 870   width: 100%
 871   margin: 0
 872   .board
 873     cursor: pointer
 874
 875 #choices
 876   user-select: none
 877   margin: 0
 878   position: absolute
 879   z-index: 300
 880   overflow-y: inherit
 881   background-color: rgba(0,0,0,0)
 882   img
 883     cursor: pointer
 884     background-color: #e6ee9c
 885     &:hover
 886       background-color: skyblue
 887     &.choice-piece
 888       width: 100%
 889       height: auto
 890       display: block
 891
 892 img.ghost
 893   // NOTE: no need to set z-index here, since opacity is low
 894   position: absolute
 895   opacity: 0.5
 896   top: 0
 897
 898 .incheck-light
 899   background-color: rgba(204, 51, 0, 0.7) !important
 900 .incheck-dark
 901   background-color: rgba(204, 51, 0, 0.9) !important
 902
 903 // TODO: no predefined highlight colors, but layers. How?
 904
 905 .hover-highlight:hover
 906   // TODO: color dependant on board theme, or inner border...
 907   background-color: #C571E6
 908
 909 .light-square.lichess.highlight-light
 910   background-color: #cdd26a
 911 .dark-square.lichess.highlight-dark
 912   background-color: #aaa23a
 913
 914 .light-square.chesscom.highlight-light
 915   background-color: #f7f783
 916 .dark-square.chesscom.highlight-dark
 917   background-color: #bacb44
 918
 919 .light-square.chesstempo.highlight-light
 920   background-color: #9f9fff
 921 .dark-square.chesstempo.highlight-dark
 922   background-color: #557fff
 923
 924 .light-square.orangecc.highlight-light
 925   background-color: #fef273
 926 .dark-square.orangecc.highlight-dark
 927   background-color: #e8c525
 928 </style>