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     "incheck",
  15     "orientation",
  16     "userColor",
  17     "vname"
  18   ],
  19   data: function() {
  20     return {
  21       possibleMoves: [], //filled after each valid click/dragstart
  22       choices: [], //promotion pieces, or checkered captures... (as moves)
  23       selectedPiece: null, //moving piece (or clicked piece)
  24       start: {}, //pixels coordinates + id of starting square (click or drag)
  25       settings: store.state.settings
  26     };
  27   },
  28   render(h) {
  29     if (!this.vr) {
  30       // Return empty div of class 'game' to avoid error when setting size
  31       return h("div", {
  32         class: {
  33           game: true
  34         }
  35       });
  36     }
  37     const [sizeX, sizeY] = [V.size.x, V.size.y];
  38     // Precompute hints squares to facilitate rendering
  39     let hintSquares = ArrayFun.init(sizeX, sizeY, false);
  40     this.possibleMoves.forEach(m => {
  41       hintSquares[m.end.x][m.end.y] = true;
  42     });
  43     // Also precompute in-check squares
  44     let incheckSq = ArrayFun.init(sizeX, sizeY, false);
  45     this.incheck.forEach(sq => {
  46       incheckSq[sq[0]][sq[1]] = true;
  47     });
  48
  49     // Create board element (+ reserves if needed by variant or mode)
  50     const lm = this.lastMove;
  51     const showLight = this.settings.highlight && this.vname != "Dark";
  52     const gameDiv = h(
  53       "div",
  54       {
  55         class: {
  56           game: true,
  57           clearer: true
  58         }
  59       },
  60       [...Array(sizeX).keys()].map(i => {
  61         let ci = this.orientation == "w" ? i : sizeX - i - 1;
  62         return h(
  63           "div",
  64           {
  65             class: {
  66               row: true
  67             },
  68             style: { opacity: this.choices.length > 0 ? "0.5" : "1" }
  69           },
  70           [...Array(sizeY).keys()].map(j => {
  71             let cj = this.orientation == "w" ? j : sizeY - j - 1;
  72             let elems = [];
  73             if (
  74               this.vr.board[ci][cj] != V.EMPTY &&
  75               (this.vname != "Dark" ||
  76                 this.analyze ||
  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.vname == "Dark" &&
 120                     !this.analyze &&
 121                     (!this.userColor ||
 122                       !this.vr.enlightened[this.userColor][ci][cj]),
 123                   highlight:
 124                     showLight && !!lm && lm.end.x == ci && lm.end.y == cj,
 125                   incheck: showLight && incheckSq[ci][cj]
 126                 },
 127                 attrs: {
 128                   id: getSquareId({ x: ci, y: cj })
 129                 }
 130               },
 131               elems
 132             );
 133           })
 134         );
 135       })
 136     );
 137     let elementArray = [gameDiv];
 138     const playingColor = this.userColor || "w"; //default for an observer
 139     if (this.vr.reserve) {
 140       const shiftIdx = playingColor == "w" ? 0 : 1;
 141       let myReservePiecesArray = [];
 142       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 143         myReservePiecesArray.push(
 144           h(
 145             "div",
 146             {
 147               class: { board: true, ["board" + sizeY]: true },
 148               attrs: { id: getSquareId({ x: sizeX + shiftIdx, y: i }) }
 149             },
 150             [
 151               h("img", {
 152                 class: { piece: true, reserve: true },
 153                 attrs: {
 154                   src:
 155                     "/images/pieces/" +
 156                     this.vr.getReservePpath(playingColor, i) +
 157                     ".svg"
 158                 }
 159               }),
 160               h("sup", { class: { "reserve-count": true } }, [
 161                 this.vr.reserve[playingColor][V.RESERVE_PIECES[i]]
 162               ])
 163             ]
 164           )
 165         );
 166       }
 167       let oppReservePiecesArray = [];
 168       const oppCol = V.GetOppCol(playingColor);
 169       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 170         oppReservePiecesArray.push(
 171           h(
 172             "div",
 173             {
 174               class: { board: true, ["board" + sizeY]: true },
 175               attrs: { id: getSquareId({ x: sizeX + (1 - shiftIdx), y: i }) }
 176             },
 177             [
 178               h("img", {
 179                 class: { piece: true, reserve: true },
 180                 attrs: {
 181                   src:
 182                     "/images/pieces/" +
 183                     this.vr.getReservePpath(oppCol, i) +
 184                     ".svg"
 185                 }
 186               }),
 187               h("sup", { class: { "reserve-count": true } }, [
 188                 this.vr.reserve[oppCol][V.RESERVE_PIECES[i]]
 189               ])
 190             ]
 191           )
 192         );
 193       }
 194       let reserves = h(
 195         "div",
 196         {
 197           class: {
 198             game: true,
 199             "reserve-div": true
 200           }
 201         },
 202         [
 203           h(
 204             "div",
 205             {
 206               class: {
 207                 row: true,
 208                 "reserve-row-1": true
 209               }
 210             },
 211             myReservePiecesArray
 212           ),
 213           h("div", { class: { row: true } }, oppReservePiecesArray)
 214         ]
 215       );
 216       elementArray.push(reserves);
 217     }
 218     const boardElt = document.querySelector(".game");
 219     if (this.choices.length > 0 && !!boardElt) {
 220       //no choices to show at first drawing
 221       const squareWidth = boardElt.offsetWidth / sizeY;
 222       const offset = [boardElt.offsetTop, boardElt.offsetLeft];
 223       const choices = h(
 224         "div",
 225         {
 226           attrs: { id: "choices" },
 227           class: { row: true },
 228           style: {
 229             top: offset[0] + (sizeY / 2) * squareWidth - squareWidth / 2 + "px",
 230             left:
 231               offset[1] +
 232               (squareWidth * (sizeY - this.choices.length)) / 2 +
 233               "px",
 234             width: this.choices.length * squareWidth + "px",
 235             height: squareWidth + "px"
 236           }
 237         },
 238         this.choices.map(m => {
 239           //a "choice" is a move
 240           return h(
 241             "div",
 242             {
 243               class: {
 244                 board: true,
 245                 ["board" + sizeY]: true
 246               },
 247               style: {
 248                 width: 100 / this.choices.length + "%",
 249                 "padding-bottom": 100 / this.choices.length + "%"
 250               }
 251             },
 252             [
 253               h("img", {
 254                 attrs: {
 255                   src:
 256                     "/images/pieces/" +
 257                     V.getPpath(m.appear[0].c + m.appear[0].p) +
 258                     ".svg"
 259                 },
 260                 class: { "choice-piece": true },
 261                 on: {
 262                   click: () => {
 263                     this.play(m);
 264                     this.choices = [];
 265                   }
 266                 }
 267               })
 268             ]
 269           );
 270         })
 271       );
 272       elementArray.unshift(choices);
 273     }
 274     let onEvents = {};
 275     // NOTE: click = mousedown + mouseup
 276     if ("ontouchstart" in window) {
 277       onEvents = {
 278         on: {
 279           touchstart: this.mousedown,
 280           touchmove: this.mousemove,
 281           touchend: this.mouseup
 282         }
 283       };
 284     } else {
 285       onEvents = {
 286         on: {
 287           mousedown: this.mousedown,
 288           mousemove: this.mousemove,
 289           mouseup: this.mouseup
 290         }
 291       };
 292     }
 293     return h("div", onEvents, elementArray);
 294   },
 295   methods: {
 296     mousedown: function(e) {
 297       // Abort if a piece is already being processed, or target is not a piece.
 298       // NOTE: just looking at classList[0] because piece is the first assigned class
 299       if (!!this.selectedPiece || e.target.classList[0] != "piece") return;
 300       e.preventDefault(); //disable native drag & drop
 301       let parent = e.target.parentNode; //the surrounding square
 302       // Next few lines to center the piece on mouse cursor
 303       let rect = parent.getBoundingClientRect();
 304       this.start = {
 305         x: rect.x + rect.width / 2,
 306         y: rect.y + rect.width / 2,
 307         id: parent.id
 308       };
 309       this.selectedPiece = e.target.cloneNode();
 310       let spStyle = this.selectedPiece.style;
 311       spStyle.position = "absolute";
 312       spStyle.top = 0;
 313       spStyle.display = "inline-block";
 314       spStyle.zIndex = 3000;
 315       const startSquare = getSquareFromId(parent.id);
 316       this.possibleMoves = [];
 317       const color = this.analyze ? this.vr.turn : this.userColor;
 318       if (this.vr.canIplay(color, startSquare))
 319         this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 320       // Next line add moving piece just after current image
 321       // (required for Crazyhouse reserve)
 322       parent.insertBefore(this.selectedPiece, e.target.nextSibling);
 323     },
 324     mousemove: function(e) {
 325       if (!this.selectedPiece) return;
 326       // There is an active element: move it around
 327       const [offsetX, offsetY] = e.clientX
 328         ? [e.clientX, e.clientY] //desktop browser
 329         : [e.changedTouches[0].pageX, e.changedTouches[0].pageY]; //smartphone
 330       this.selectedPiece.style.left = offsetX - this.start.x + "px";
 331       this.selectedPiece.style.top = offsetY - this.start.y + "px";
 332     },
 333     mouseup: function(e) {
 334       if (!this.selectedPiece) return;
 335       // There is an active element: obtain the move from start and end squares
 336       this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coords
 337       const [offsetX, offsetY] = e.clientX
 338         ? [e.clientX, e.clientY]
 339         : [e.changedTouches[0].pageX, e.changedTouches[0].pageY];
 340       let landing = document.elementFromPoint(offsetX, offsetY);
 341       this.selectedPiece.style.zIndex = 3000;
 342       // Next condition: classList.contains(piece) fails because of marks
 343       while (landing.tagName == "IMG") landing = landing.parentNode;
 344       if (this.start.id == landing.id)
 345         //one or multi clicks on same piece
 346         return;
 347       // OK: process move attempt, landing is a square node
 348       let endSquare = getSquareFromId(landing.id);
 349       let moves = this.findMatchingMoves(endSquare);
 350       this.possibleMoves = [];
 351       if (moves.length > 1) this.choices = moves;
 352       else if (moves.length == 1) this.play(moves[0]);
 353       // Else: impossible move
 354       this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 355       delete this.selectedPiece;
 356       this.selectedPiece = null;
 357     },
 358     findMatchingMoves: function(endSquare) {
 359       // Run through moves list and return the matching set (if promotions...)
 360       let moves = [];
 361       this.possibleMoves.forEach(function(m) {
 362         if (endSquare[0] == m.end.x && endSquare[1] == m.end.y) moves.push(m);
 363       });
 364       return moves;
 365     },
 366     play: function(move) {
 367       this.$emit("play-move", move);
 368     }
 369   }
 370 };
 371 </script>
 372
 373 <style lang="sass" scoped>
 374 .game.reserve-div
 375   margin-bottom: 18px
 376
 377 .reserve-count
 378   padding-left: 40%
 379
 380 .reserve-row-1
 381   margin-bottom: 15px
 382
 383 // NOTE: no variants with reserve of size != 8
 384
 385 .game
 386   width: 100%
 387   margin: 0
 388   .board
 389     cursor: pointer
 390
 391 #choices
 392   margin: 0
 393   position: absolute
 394   z-index: 300
 395   overflow-y: inherit
 396   background-color: rgba(0,0,0,0)
 397   img
 398     cursor: pointer
 399     background-color: #e6ee9c
 400     &:hover
 401       background-color: skyblue
 402     &.choice-piece
 403       width: 100%
 404       height: auto
 405       display: block
 406
 407 img.ghost
 408   position: absolute
 409   opacity: 0.4
 410   top: 0
 411
 412 .highlight
 413   background-color: #00cc66 !important
 414
 415 .incheck
 416   background-color: #cc3300 !important
 417
 418 .light-square.lichess
 419   background-color: #f0d9b5;
 420 .dark-square.lichess
 421   background-color: #b58863;
 422
 423 .light-square.chesscom
 424   background-color: #e5e5ca;
 425 .dark-square.chesscom
 426   background-color: #6f8f57;
 427
 428 .light-square.chesstempo
 429   background-color: #fdfdfd;
 430 .dark-square.chesstempo
 431   background-color: #88a0a8;
 432 </style>