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     // Create board element (+ reserves if needed by variant)
  51     const lm = this.lastMove;
  52     const showLight = this.settings.highlight && V.ShowMoves == "all";
  53     const gameDiv = h(
  54       "div",
  55       {
  56         class: {
  57           game: true,
  58           clearer: true
  59         }
  60       },
  61       [...Array(sizeX).keys()].map(i => {
  62         let ci = this.orientation == "w" ? i : sizeX - i - 1;
  63         return h(
  64           "div",
  65           {
  66             class: {
  67               row: true
  68             },
  69             style: { opacity: this.choices.length > 0 ? "0.5" : "1" }
  70           },
  71           [...Array(sizeY).keys()].map(j => {
  72             let cj = this.orientation == "w" ? j : sizeY - j - 1;
  73             let elems = [];
  74             if (
  75               this.vr.board[ci][cj] != V.EMPTY &&
  76               (!this.vr.enlightened || this.analyze || this.score != "*" ||
  77                 (!!this.userColor &&
  78                   this.vr.enlightened[this.userColor][ci][cj]))
  79             ) {
  80               elems.push(
  81                 h("img", {
  82                   class: {
  83                     piece: true,
  84                     ghost:
  85                       !!this.selectedPiece &&
  86                       this.selectedPiece.parentNode.id == "sq-" + ci + "-" + cj
  87                   },
  88                   attrs: {
  89                     src:
  90                       "/images/pieces/" +
  91                       V.getPpath(this.vr.board[ci][cj]) +
  92                       ".svg"
  93                   }
  94                 })
  95               );
  96             }
  97             if (this.settings.hints && hintSquares[ci][cj]) {
  98               elems.push(
  99                 h("img", {
 100                   class: {
 101                     "mark-square": true
 102                   },
 103                   attrs: {
 104                     src: "/images/mark.svg"
 105                   }
 106                 })
 107               );
 108             }
 109             return h(
 110               "div",
 111               {
 112                 class: {
 113                   board: true,
 114                   ["board" + sizeY]: true,
 115                   "light-square": (i + j) % 2 == 0,
 116                   "dark-square": (i + j) % 2 == 1,
 117                   [this.settings.bcolor]: true,
 118                   "in-shadow":
 119                     !this.analyze &&
 120                     this.score == "*" &&
 121                     this.vr.enlightened &&
 122                     (!this.userColor ||
 123                       !this.vr.enlightened[this.userColor][ci][cj]),
 124                   highlight:
 125                     showLight && !!lm && lm.end.x == ci && lm.end.y == cj,
 126                   incheck: showLight && incheckSq[ci][cj]
 127                 },
 128                 attrs: {
 129                   id: getSquareId({ x: ci, y: cj })
 130                 }
 131               },
 132               elems
 133             );
 134           })
 135         );
 136       })
 137     );
 138     let elementArray = [gameDiv];
 139     const playingColor = this.userColor || "w"; //default for an observer
 140     if (this.vr.reserve) {
 141       const shiftIdx = playingColor == "w" ? 0 : 1;
 142       let myReservePiecesArray = [];
 143       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 144         myReservePiecesArray.push(
 145           h(
 146             "div",
 147             {
 148               class: { board: true, ["board" + sizeY]: true },
 149               attrs: { id: getSquareId({ x: sizeX + shiftIdx, y: i }) }
 150             },
 151             [
 152               h("img", {
 153                 class: { piece: true, reserve: true },
 154                 attrs: {
 155                   src:
 156                     "/images/pieces/" +
 157                     this.vr.getReservePpath(playingColor, i) +
 158                     ".svg"
 159                 }
 160               }),
 161               h("sup", { class: { "reserve-count": true } }, [
 162                 this.vr.reserve[playingColor][V.RESERVE_PIECES[i]]
 163               ])
 164             ]
 165           )
 166         );
 167       }
 168       let oppReservePiecesArray = [];
 169       const oppCol = V.GetOppCol(playingColor);
 170       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 171         oppReservePiecesArray.push(
 172           h(
 173             "div",
 174             {
 175               class: { board: true, ["board" + sizeY]: true },
 176               attrs: { id: getSquareId({ x: sizeX + (1 - shiftIdx), y: i }) }
 177             },
 178             [
 179               h("img", {
 180                 class: { piece: true, reserve: true },
 181                 attrs: {
 182                   src:
 183                     "/images/pieces/" +
 184                     this.vr.getReservePpath(oppCol, i) +
 185                     ".svg"
 186                 }
 187               }),
 188               h("sup", { class: { "reserve-count": true } }, [
 189                 this.vr.reserve[oppCol][V.RESERVE_PIECES[i]]
 190               ])
 191             ]
 192           )
 193         );
 194       }
 195       let reserves = h(
 196         "div",
 197         {
 198           class: {
 199             game: true,
 200             "reserve-div": true
 201           }
 202         },
 203         [
 204           h(
 205             "div",
 206             {
 207               class: {
 208                 row: true,
 209                 "reserve-row-1": true
 210               }
 211             },
 212             myReservePiecesArray
 213           ),
 214           h("div", { class: { row: true } }, oppReservePiecesArray)
 215         ]
 216       );
 217       elementArray.push(reserves);
 218     }
 219     const boardElt = document.querySelector(".game");
 220     if (this.choices.length > 0 && !!boardElt) {
 221       //no choices to show at first drawing
 222       const squareWidth = boardElt.offsetWidth / sizeY;
 223       const offset = [boardElt.offsetTop, boardElt.offsetLeft];
 224       const choices = h(
 225         "div",
 226         {
 227           attrs: { id: "choices" },
 228           class: { row: true },
 229           style: {
 230             top: offset[0] + (sizeY / 2) * squareWidth - squareWidth / 2 + "px",
 231             left:
 232               offset[1] +
 233               (squareWidth * (sizeY - this.choices.length)) / 2 +
 234               "px",
 235             width: this.choices.length * squareWidth + "px",
 236             height: squareWidth + "px"
 237           }
 238         },
 239         this.choices.map(m => {
 240           //a "choice" is a move
 241           return h(
 242             "div",
 243             {
 244               class: {
 245                 board: true,
 246                 ["board" + sizeY]: true
 247               },
 248               style: {
 249                 width: 100 / this.choices.length + "%",
 250                 "padding-bottom": 100 / this.choices.length + "%"
 251               }
 252             },
 253             [
 254               h("img", {
 255                 attrs: {
 256                   src:
 257                     "/images/pieces/" +
 258                     V.getPpath(m.appear[0].c + m.appear[0].p) +
 259                     ".svg"
 260                 },
 261                 class: { "choice-piece": true },
 262                 on: {
 263                   click: () => {
 264                     this.play(m);
 265                     this.choices = [];
 266                   }
 267                 }
 268               })
 269             ]
 270           );
 271         })
 272       );
 273       elementArray.unshift(choices);
 274     }
 275     let onEvents = {};
 276     // NOTE: click = mousedown + mouseup
 277     if ("ontouchstart" in window) {
 278       onEvents = {
 279         on: {
 280           touchstart: this.mousedown,
 281           touchmove: this.mousemove,
 282           touchend: this.mouseup
 283         }
 284       };
 285     } else {
 286       onEvents = {
 287         on: {
 288           mousedown: this.mousedown,
 289           mousemove: this.mousemove,
 290           mouseup: this.mouseup
 291         }
 292       };
 293     }
 294     return h("div", onEvents, elementArray);
 295   },
 296   methods: {
 297     mousedown: function(e) {
 298       // Abort if a piece is already being processed, or target is not a piece.
 299       // NOTE: just looking at classList[0] because piece is the first assigned class
 300       if (!!this.selectedPiece || e.target.classList[0] != "piece") return;
 301       e.preventDefault(); //disable native drag & drop
 302       let parent = e.target.parentNode; //the surrounding square
 303       // Next few lines to center the piece on mouse cursor
 304       let rect = parent.getBoundingClientRect();
 305       this.start = {
 306         x: rect.x + rect.width / 2,
 307         y: rect.y + rect.width / 2,
 308         id: parent.id
 309       };
 310       this.selectedPiece = e.target.cloneNode();
 311       let spStyle = this.selectedPiece.style;
 312       spStyle.position = "absolute";
 313       spStyle.top = 0;
 314       spStyle.display = "inline-block";
 315       spStyle.zIndex = 3000;
 316       const startSquare = getSquareFromId(parent.id);
 317       this.possibleMoves = [];
 318       const color = this.analyze ? this.vr.turn : this.userColor;
 319       if (this.vr.canIplay(color, startSquare))
 320         this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 321       // Next line add moving piece just after current image
 322       // (required for Crazyhouse reserve)
 323       parent.insertBefore(this.selectedPiece, e.target.nextSibling);
 324     },
 325     mousemove: function(e) {
 326       if (!this.selectedPiece) return;
 327       // There is an active element: move it around
 328       const [offsetX, offsetY] = e.clientX
 329         ? [e.clientX, e.clientY] //desktop browser
 330         : [e.changedTouches[0].pageX, e.changedTouches[0].pageY]; //smartphone
 331       this.selectedPiece.style.left = offsetX - this.start.x + "px";
 332       this.selectedPiece.style.top = offsetY - this.start.y + "px";
 333     },
 334     mouseup: function(e) {
 335       if (!this.selectedPiece) return;
 336       // There is an active element: obtain the move from start and end squares
 337       this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coords
 338       const [offsetX, offsetY] = e.clientX
 339         ? [e.clientX, e.clientY]
 340         : [e.changedTouches[0].pageX, e.changedTouches[0].pageY];
 341       let landing = document.elementFromPoint(offsetX, offsetY);
 342       this.selectedPiece.style.zIndex = 3000;
 343       // Next condition: classList.contains(piece) fails because of marks
 344       while (landing.tagName == "IMG") landing = landing.parentNode;
 345       if (this.start.id == landing.id)
 346         //one or multi clicks on same piece
 347         return;
 348       // OK: process move attempt, landing is a square node
 349       let endSquare = getSquareFromId(landing.id);
 350       let moves = this.findMatchingMoves(endSquare);
 351       this.possibleMoves = [];
 352       if (moves.length > 1) this.choices = moves;
 353       else if (moves.length == 1) this.play(moves[0]);
 354       // Else: impossible move
 355       this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 356       delete this.selectedPiece;
 357       this.selectedPiece = null;
 358     },
 359     findMatchingMoves: function(endSquare) {
 360       // Run through moves list and return the matching set (if promotions...)
 361       let moves = [];
 362       this.possibleMoves.forEach(function(m) {
 363         if (endSquare[0] == m.end.x && endSquare[1] == m.end.y) moves.push(m);
 364       });
 365       return moves;
 366     },
 367     play: function(move) {
 368       this.$emit("play-move", move);
 369     }
 370   }
 371 };
 372 </script>
 373
 374 <style lang="sass" scoped>
 375 .game.reserve-div
 376   margin-bottom: 18px
 377
 378 .reserve-count
 379   padding-left: 40%
 380
 381 .reserve-row-1
 382   margin-bottom: 15px
 383
 384 // NOTE: no variants with reserve of size != 8
 385
 386 .game
 387   width: 100%
 388   margin: 0
 389   .board
 390     cursor: pointer
 391
 392 #choices
 393   margin: 0
 394   position: absolute
 395   z-index: 300
 396   overflow-y: inherit
 397   background-color: rgba(0,0,0,0)
 398   img
 399     cursor: pointer
 400     background-color: #e6ee9c
 401     &:hover
 402       background-color: skyblue
 403     &.choice-piece
 404       width: 100%
 405       height: auto
 406       display: block
 407
 408 img.ghost
 409   position: absolute
 410   opacity: 0.4
 411   top: 0
 412
 413 .highlight
 414   background-color: #00cc66 !important
 415
 416 .incheck
 417   background-color: #cc3300 !important
 418
 419 .light-square.lichess
 420   background-color: #f0d9b5;
 421 .dark-square.lichess
 422   background-color: #b58863;
 423
 424 .light-square.chesscom
 425   background-color: #e5e5ca;
 426 .dark-square.chesscom
 427   background-color: #6f8f57;
 428
 429 .light-square.chesstempo
 430   background-color: #fdfdfd;
 431 .dark-square.chesstempo
 432   background-color: #88a0a8;
 433 </style>