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