client/src/components/Board.vue

   1 <script>
   2 import { getSquareId, getSquareFromId } from "@/utils/squareId";
   3 import { ArrayFun } from "@/utils/array";
   4 import { store } from "@/store";
   5 export default {
   6   name: "my-board",
   7   // Last move cannot be guessed from here, and is required to highlight squares
   8   // vr: object to check moves, print board...
   9   // userColor is left undefined for an external observer
  10   props: [
  11     "vr",
  12     "lastMove",
  13     "analyze",
  14     "score",
  15     "incheck",
  16     "orientation",
  17     "userColor",
  18     "vname"
  19   ],
  20   data: function() {
  21     return {
  22       mobileBrowser: ("ontouchstart" in window),
  23       possibleMoves: [], //filled after each valid click/dragstart
  24       choices: [], //promotion pieces, or checkered captures... (as moves)
  25       selectedPiece: null, //moving piece (or clicked piece)
  26       start: {}, //pixels coordinates + id of starting square (click or drag)
  27       settings: store.state.settings
  28     };
  29   },
  30   render(h) {
  31     if (!this.vr) {
  32       // Return empty div of class 'game' to avoid error when setting size
  33       return h("div", {
  34         class: {
  35           game: true
  36         }
  37       });
  38     }
  39     const [sizeX, sizeY] = [V.size.x, V.size.y];
  40     // Precompute hints squares to facilitate rendering
  41     let hintSquares = ArrayFun.init(sizeX, sizeY, false);
  42     this.possibleMoves.forEach(m => {
  43       hintSquares[m.end.x][m.end.y] = true;
  44     });
  45     // Also precompute in-check squares
  46     let incheckSq = ArrayFun.init(sizeX, sizeY, false);
  47     this.incheck.forEach(sq => {
  48       incheckSq[sq[0]][sq[1]] = true;
  49     });
  50
  51     const lm = this.lastMove;
  52     const showLight = (
  53       this.settings.highlight &&
  54       ["all","highlight"].includes(V.ShowMoves)
  55     );
  56     const orientation = !V.CanFlip ? "w" : this.orientation;
  57     // Ensure that squares colors do not change when board is flipped
  58     const lightSquareMod = (sizeX + sizeY) % 2;
  59     const showPiece = (x, y) => {
  60       return (
  61         this.vr.board[x][y] != V.EMPTY &&
  62         (!this.vr.enlightened || this.analyze || this.score != "*" ||
  63           (!!this.userColor && this.vr.enlightened[this.userColor][x][y]))
  64       );
  65     };
  66     const inHighlight = (x, y) => {
  67       return showLight && !!lm && (
  68         (lm.end.x == x && lm.end.y == y) ||
  69         (lm.start.x == x && lm.start.y == y));
  70     };
  71     const inShadow = (x, y) => {
  72       return (
  73         !this.analyze &&
  74         this.score == "*" &&
  75         this.vr.enlightened &&
  76         (!this.userColor || !this.vr.enlightened[this.userColor][x][y])
  77       );
  78     };
  79     // Create board element (+ reserves if needed by variant)
  80     const gameDiv = h(
  81       "div",
  82       {
  83         class: {
  84           game: true,
  85           clearer: true
  86         }
  87       },
  88       [...Array(sizeX).keys()].map(i => {
  89         const ci = orientation == "w" ? i : sizeX - i - 1;
  90         return h(
  91           "div",
  92           {
  93             class: {
  94               row: true
  95             },
  96             style: { opacity: this.choices.length > 0 ? "0.5" : "1" }
  97           },
  98           [...Array(sizeY).keys()].map(j => {
  99             const cj = orientation == "w" ? j : sizeY - j - 1;
 100             let elems = [];
 101             if (showPiece(ci, cj)) {
 102               elems.push(
 103                 h("img", {
 104                   class: {
 105                     piece: true,
 106                     ghost:
 107                       !!this.selectedPiece &&
 108                       this.selectedPiece.parentNode.id == "sq-" + ci + "-" + cj
 109                   },
 110                   attrs: {
 111                     src:
 112                       "/images/pieces/" +
 113                       this.vr.getPpath(this.vr.board[ci][cj], this.userColor, this.score) +
 114                       ".svg"
 115                   }
 116                 })
 117               );
 118             }
 119             if (this.settings.hints && hintSquares[ci][cj]) {
 120               elems.push(
 121                 h("img", {
 122                   class: {
 123                     "mark-square": true
 124                   },
 125                   attrs: {
 126                     src: "/images/mark.svg"
 127                   }
 128                 })
 129               );
 130             }
 131             const lightSquare = (ci + cj) % 2 == lightSquareMod;
 132             return h(
 133               "div",
 134               {
 135                 class: {
 136                   board: true,
 137                   ["board" + sizeY]: true,
 138                   "light-square": lightSquare,
 139                   "dark-square": !lightSquare,
 140                   [this.settings.bcolor]: true,
 141                   "in-shadow": inShadow(ci, cj),
 142                   "highlight-light": inHighlight(ci, cj) && lightSquare,
 143                   "highlight-dark": inHighlight(ci, cj) && !lightSquare,
 144                   "incheck-light": showLight && lightSquare && incheckSq[ci][cj],
 145                   "incheck-dark": showLight && !lightSquare && incheckSq[ci][cj]
 146                 },
 147                 attrs: {
 148                   id: getSquareId({ x: ci, y: cj })
 149                 }
 150               },
 151               elems
 152             );
 153           })
 154         );
 155       })
 156     );
 157     let elementArray = [gameDiv];
 158     const playingColor = this.userColor || "w"; //default for an observer
 159     if (this.vr.reserve) {
 160       const shiftIdx = playingColor == "w" ? 0 : 1;
 161       let myReservePiecesArray = [];
 162       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 163         myReservePiecesArray.push(
 164           h(
 165             "div",
 166             {
 167               class: { board: true, ["board" + sizeY]: true },
 168               attrs: { id: getSquareId({ x: sizeX + shiftIdx, y: i }) }
 169             },
 170             [
 171               h("img", {
 172                 class: { piece: true, reserve: true },
 173                 attrs: {
 174                   src:
 175                     "/images/pieces/" +
 176                     this.vr.getReservePpath(i, playingColor) +
 177                     ".svg"
 178                 }
 179               }),
 180               h("sup", { class: { "reserve-count": true } }, [
 181                 this.vr.reserve[playingColor][V.RESERVE_PIECES[i]]
 182               ])
 183             ]
 184           )
 185         );
 186       }
 187       let oppReservePiecesArray = [];
 188       const oppCol = V.GetOppCol(playingColor);
 189       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 190         oppReservePiecesArray.push(
 191           h(
 192             "div",
 193             {
 194               class: { board: true, ["board" + sizeY]: true },
 195               attrs: { id: getSquareId({ x: sizeX + (1 - shiftIdx), y: i }) }
 196             },
 197             [
 198               h("img", {
 199                 class: { piece: true, reserve: true },
 200                 attrs: {
 201                   src:
 202                     "/images/pieces/" +
 203                     this.vr.getReservePpath(i, oppCol) +
 204                     ".svg"
 205                 }
 206               }),
 207               h("sup", { class: { "reserve-count": true } }, [
 208                 this.vr.reserve[oppCol][V.RESERVE_PIECES[i]]
 209               ])
 210             ]
 211           )
 212         );
 213       }
 214       let reserves = h(
 215         "div",
 216         {
 217           class: {
 218             game: true,
 219             "reserve-div": true
 220           }
 221         },
 222         [
 223           h(
 224             "div",
 225             {
 226               class: {
 227                 row: true,
 228                 "reserve-row-1": true
 229               }
 230             },
 231             myReservePiecesArray
 232           ),
 233           h("div", { class: { row: true } }, oppReservePiecesArray)
 234         ]
 235       );
 236       elementArray.push(reserves);
 237     }
 238     const boardElt = document.querySelector(".game");
 239     if (this.choices.length > 0 && !!boardElt) {
 240       //no choices to show at first drawing
 241       const squareWidth = boardElt.offsetWidth / sizeY;
 242       const offset = [boardElt.offsetTop, boardElt.offsetLeft];
 243       const choices = h(
 244         "div",
 245         {
 246           attrs: { id: "choices" },
 247           class: { row: true },
 248           style: {
 249             top: offset[0] + (sizeY / 2) * squareWidth - squareWidth / 2 + "px",
 250             left:
 251               offset[1] +
 252               (squareWidth * (sizeY - this.choices.length)) / 2 +
 253               "px",
 254             width: this.choices.length * squareWidth + "px",
 255             height: squareWidth + "px"
 256           }
 257         },
 258         this.choices.map(m => {
 259           //a "choice" is a move
 260           return h(
 261             "div",
 262             {
 263               class: {
 264                 board: true,
 265                 ["board" + sizeY]: true
 266               },
 267               style: {
 268                 width: 100 / this.choices.length + "%",
 269                 "padding-bottom": 100 / this.choices.length + "%"
 270               }
 271             },
 272             [
 273               h("img", {
 274                 attrs: {
 275                   src:
 276                     "/images/pieces/" +
 277                     this.vr.getPpath(m.appear[0].c + m.appear[0].p) +
 278                     ".svg"
 279                 },
 280                 class: { "choice-piece": true },
 281                 on: {
 282                   click: () => {
 283                     this.play(m);
 284                     this.choices = [];
 285                   }
 286                 }
 287               })
 288             ]
 289           );
 290         })
 291       );
 292       elementArray.unshift(choices);
 293     }
 294     let onEvents = {};
 295     // NOTE: click = mousedown + mouseup
 296     if (this.mobileBrowser) {
 297       onEvents = {
 298         on: {
 299           touchstart: this.mousedown,
 300           touchmove: this.mousemove,
 301           touchend: this.mouseup
 302         }
 303       };
 304     } else {
 305       onEvents = {
 306         on: {
 307           mousedown: this.mousedown,
 308           mousemove: this.mousemove,
 309           mouseup: this.mouseup
 310         }
 311       };
 312     }
 313     return h("div", onEvents, elementArray);
 314   },
 315   methods: {
 316     mousedown: function(e) {
 317       // Abort if a piece is already being processed, or target is not a piece.
 318       // NOTE: just looking at classList[0] because piece is the first assigned class
 319       if (!!this.selectedPiece || e.target.classList[0] != "piece") return;
 320       e.preventDefault(); //disable native drag & drop
 321       let parent = e.target.parentNode; //the surrounding square
 322       // Next few lines to center the piece on mouse cursor
 323       let rect = parent.getBoundingClientRect();
 324       this.start = {
 325         x: rect.x + rect.width / 2,
 326         y: rect.y + rect.width / 2,
 327         id: parent.id
 328       };
 329       this.selectedPiece = e.target.cloneNode();
 330       let spStyle = this.selectedPiece.style;
 331       spStyle.position = "absolute";
 332       spStyle.top = 0;
 333       spStyle.display = "inline-block";
 334       spStyle.zIndex = 3000;
 335       const startSquare = getSquareFromId(parent.id);
 336       this.possibleMoves = [];
 337       const color = this.analyze ? this.vr.turn : this.userColor;
 338       if (this.vr.canIplay(color, startSquare))
 339         this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 340       // Next line add moving piece just after current image
 341       // (required for Crazyhouse reserve)
 342       parent.insertBefore(this.selectedPiece, e.target.nextSibling);
 343     },
 344     mousemove: function(e) {
 345       if (!this.selectedPiece) return;
 346       // There is an active element: move it around
 347       const [offsetX, offsetY] =
 348         this.mobileBrowser
 349           ? [e.changedTouches[0].pageX, e.changedTouches[0].pageY]
 350           : [e.clientX, e.clientY];
 351       this.selectedPiece.style.left = offsetX - this.start.x + "px";
 352       this.selectedPiece.style.top = offsetY - this.start.y + "px";
 353     },
 354     mouseup: function(e) {
 355       if (!this.selectedPiece) return;
 356       // There is an active element: obtain the move from start and end squares
 357       this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coords
 358       const [offsetX, offsetY] =
 359         this.mobileBrowser
 360           ? [e.changedTouches[0].pageX, e.changedTouches[0].pageY]
 361           : [e.clientX, e.clientY];
 362       let landing = document.elementFromPoint(offsetX, offsetY);
 363       this.selectedPiece.style.zIndex = 3000;
 364       // Next condition: classList.contains(piece) fails because of marks
 365       while (landing.tagName == "IMG") landing = landing.parentNode;
 366       if (this.start.id == landing.id)
 367         // One or multi clicks on same piece
 368         return;
 369       // OK: process move attempt, landing is a square node
 370       let endSquare = getSquareFromId(landing.id);
 371       let moves = this.findMatchingMoves(endSquare);
 372       this.possibleMoves = [];
 373       if (moves.length > 1) this.choices = moves;
 374       else if (moves.length == 1) this.play(moves[0]);
 375       // Else: impossible move
 376       this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 377       delete this.selectedPiece;
 378       this.selectedPiece = null;
 379     },
 380     findMatchingMoves: function(endSquare) {
 381       // Run through moves list and return the matching set (if promotions...)
 382       let moves = [];
 383       this.possibleMoves.forEach(function(m) {
 384         if (endSquare[0] == m.end.x && endSquare[1] == m.end.y) moves.push(m);
 385       });
 386       return moves;
 387     },
 388     play: function(move) {
 389       this.$emit("play-move", move);
 390     }
 391   }
 392 };
 393 </script>
 394
 395 <style lang="sass" scoped>
 396 .game.reserve-div
 397   margin-bottom: 18px
 398
 399 .reserve-count
 400   padding-left: 40%
 401
 402 .reserve-row-1
 403   margin-bottom: 15px
 404
 405 // NOTE: no variants with reserve of size != 8
 406
 407 .game
 408   width: 100%
 409   margin: 0
 410   .board
 411     cursor: pointer
 412
 413 #choices
 414   margin: 0
 415   position: absolute
 416   z-index: 300
 417   overflow-y: inherit
 418   background-color: rgba(0,0,0,0)
 419   img
 420     cursor: pointer
 421     background-color: #e6ee9c
 422     &:hover
 423       background-color: skyblue
 424     &.choice-piece
 425       width: 100%
 426       height: auto
 427       display: block
 428
 429 img.ghost
 430   position: absolute
 431   opacity: 0.4
 432   top: 0
 433
 434 .highlight-light
 435   background-color: rgba(0, 204, 102, 0.7) !important
 436 .highlight-dark
 437   background-color: rgba(0, 204, 102, 0.9) !important
 438
 439 .incheck-light
 440   background-color: rgba(204, 51, 0, 0.7) !important
 441 .incheck-dark
 442   background-color: rgba(204, 51, 0, 0.9) !important
 443
 444 .light-square.lichess
 445   background-color: #f0d9b5;
 446 .dark-square.lichess
 447   background-color: #b58863;
 448
 449 .light-square.chesscom
 450   background-color: #e5e5ca;
 451 .dark-square.chesscom
 452   background-color: #6f8f57;
 453
 454 .light-square.chesstempo
 455   background-color: #fdfdfd;
 456 .dark-square.chesstempo
 457   background-color: #88a0a8;
 458 </style>