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: ["vr","lastMove","analyze","incheck","orientation","userColor","vname"],
  11   data: function () {
  12     return {
  13       possibleMoves: [], //filled after each valid click/dragstart
  14       choices: [], //promotion pieces, or checkered captures... (as moves)
  15       selectedPiece: null, //moving piece (or clicked piece)
  16       start: {}, //pixels coordinates + id of starting square (click or drag)
  17       settings: store.state.settings,
  18     };
  19   },
  20   render(h) {
  21     if (!this.vr)
  22     {
  23       // Return empty div of class 'game' to avoid error when setting size
  24       return h("div",
  25         {
  26           "class": {
  27             "game": true,
  28           },
  29         });
  30     }
  31     const [sizeX,sizeY] = [V.size.x,V.size.y];
  32     // Precompute hints squares to facilitate rendering
  33     let hintSquares = ArrayFun.init(sizeX, sizeY, false);
  34     this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
  35     // Also precompute in-check squares
  36     let incheckSq = ArrayFun.init(sizeX, sizeY, false);
  37     this.incheck.forEach(sq => { incheckSq[sq[0]][sq[1]] = true; });
  38
  39     let boardElt = document.querySelector(".game");
  40     const squareWidth = (!!boardElt
  41       ? boardElt.offsetWidth / sizeY
  42       : 40); //arbitrary value (not relevant)
  43     const offset = (!!boardElt
  44       ? [boardElt.offsetTop, boardElt.offsetLeft]
  45       : [0, 0]);
  46     const choices = h(
  47       'div',
  48       {
  49         attrs: { "id": "choices" },
  50         'class': { 'row': true },
  51         style: {
  52           "display": (this.choices.length > 0 ? "block" : "none"),
  53           "top": (offset[0] + (sizeY/2)*squareWidth-squareWidth/2) + "px",
  54           "left": (offset[1] + squareWidth*(sizeY - this.choices.length)/2) + "px",
  55           "width": (this.choices.length * squareWidth) + "px",
  56           "height": squareWidth + "px",
  57         },
  58       },
  59       this.choices.map(m => { //a "choice" is a move
  60         return h('div',
  61           {
  62             'class': {
  63               'board': true,
  64               ['board'+sizeY]: true,
  65             },
  66             style: {
  67               'width': (100/this.choices.length) + "%",
  68               'padding-bottom': (100/this.choices.length) + "%",
  69             },
  70           },
  71           [h('img',
  72             {
  73               attrs: { "src": '/images/pieces/' +
  74                 V.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
  75               'class': { 'choice-piece': true },
  76               on: {
  77                 "click": e => { this.play(m); this.choices=[]; },
  78                 // NOTE: add 'touchstart' event to fix a problem on smartphones
  79                 "touchstart": e => { this.play(m); this.choices=[]; },
  80               },
  81             })
  82           ]
  83         );
  84       })
  85     );
  86     // Create board element (+ reserves if needed by variant or mode)
  87     const lm = this.lastMove;
  88     const showLight = this.settings.highlight && this.vname != "Dark";
  89     const gameDiv = h(
  90       'div',
  91       {
  92         'class': {
  93           'game': true,
  94           'clearer': true,
  95         },
  96       },
  97       [...Array(sizeX).keys()].map(i => {
  98         let ci = (this.orientation=='w' ? i : sizeX-i-1);
  99         return h(
 100           'div',
 101           {
 102             'class': {
 103               'row': true,
 104             },
 105             style: { 'opacity': this.choices.length>0?"0.5":"1" },
 106           },
 107           [...Array(sizeY).keys()].map(j => {
 108             let cj = (this.orientation=='w' ? j : sizeY-j-1);
 109             let elems = [];
 110             if (this.vr.board[ci][cj] != V.EMPTY && (this.vname!="Dark"
 111               || this.analyze || (!!this.userColor
 112                 && this.vr.enlightened[this.userColor][ci][cj])))
 113             {
 114               elems.push(
 115                 h(
 116                   'img',
 117                   {
 118                     'class': {
 119                       'piece': true,
 120                       'ghost': !!this.selectedPiece
 121                         && this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
 122                     },
 123                     attrs: {
 124                       src: "/images/pieces/" +
 125                         V.getPpath(this.vr.board[ci][cj]) + ".svg",
 126                     },
 127                   }
 128                 )
 129               );
 130             }
 131             if (this.settings.hints && hintSquares[ci][cj])
 132             {
 133               elems.push(
 134                 h(
 135                   'img',
 136                   {
 137                     'class': {
 138                       'mark-square': true,
 139                     },
 140                     attrs: {
 141                       src: "/images/mark.svg",
 142                     },
 143                   }
 144                 )
 145               );
 146             }
 147             return h(
 148               'div',
 149               {
 150                 'class': {
 151                   'board': true,
 152                   ['board'+sizeY]: true,
 153                   'light-square': (i+j)%2==0,
 154                   'dark-square': (i+j)%2==1,
 155                   [this.settings.bcolor]: true,
 156                   'in-shadow': this.vname=="Dark" && !this.analyze
 157                     && (!this.userColor
 158                       || !this.vr.enlightened[this.userColor][ci][cj]),
 159                   'highlight': showLight && !!lm && lm.end.x == ci && lm.end.y == cj,
 160                   'incheck': showLight && incheckSq[ci][cj],
 161                 },
 162                 attrs: {
 163                   id: getSquareId({x:ci,y:cj}),
 164                 },
 165               },
 166               elems
 167             );
 168           })
 169         );
 170       })
 171     );
 172     const playingColor = this.userColor || "w"; //default for an observer
 173     let elementArray = [choices, gameDiv];
 174     if (!!this.vr.reserve)
 175     {
 176       const shiftIdx = (playingColor=="w" ? 0 : 1);
 177       let myReservePiecesArray = [];
 178       for (let i=0; i<V.RESERVE_PIECES.length; i++)
 179       {
 180         myReservePiecesArray.push(h('div',
 181         {
 182           'class': {'board':true, ['board'+sizeY]:true},
 183           attrs: { id: getSquareId({x:sizeX+shiftIdx,y:i}) }
 184         },
 185         [
 186           h('img',
 187           {
 188             'class': {"piece":true, "reserve":true},
 189             attrs: {
 190               "src": "/images/pieces/" +
 191                 this.vr.getReservePpath(playingColor,i) + ".svg",
 192             }
 193           }),
 194           h('sup',
 195             {"class": { "reserve-count": true } },
 196             [ this.vr.reserve[playingColor][V.RESERVE_PIECES[i]] ]
 197           )
 198         ]));
 199       }
 200       let oppReservePiecesArray = [];
 201       const oppCol = V.GetOppCol(playingColor);
 202       for (let i=0; i<V.RESERVE_PIECES.length; i++)
 203       {
 204         oppReservePiecesArray.push(h('div',
 205         {
 206           'class': {'board':true, ['board'+sizeY]:true},
 207           attrs: { id: getSquareId({x:sizeX+(1-shiftIdx),y:i}) }
 208         },
 209         [
 210           h('img',
 211           {
 212             'class': {"piece":true, "reserve":true},
 213             attrs: {
 214               "src": "/images/pieces/" +
 215                 this.vr.getReservePpath(oppCol,i) + ".svg",
 216             }
 217           }),
 218           h('sup',
 219             {"class": { "reserve-count": true } },
 220             [ this.vr.reserve[oppCol][V.RESERVE_PIECES[i]] ]
 221           )
 222         ]));
 223       }
 224       let reserves = h('div',
 225         {
 226           'class':{
 227             'game': true,
 228             "reserve-div": true,
 229           },
 230         },
 231         [
 232           h('div',
 233             {
 234               'class': {
 235                 'row': true,
 236                 "reserve-row-1": true,
 237               },
 238             },
 239             myReservePiecesArray
 240           ),
 241           h('div',
 242             { 'class': { 'row': true }},
 243             oppReservePiecesArray
 244           )
 245         ]
 246       );
 247       elementArray.push(reserves);
 248     }
 249     return h(
 250       'div',
 251       {
 252         // NOTE: click = mousedown + mouseup
 253         on: {
 254           mousedown: this.mousedown,
 255           mousemove: this.mousemove,
 256           mouseup: this.mouseup,
 257           touchstart: this.mousedown,
 258           touchmove: this.mousemove,
 259           touchend: this.mouseup,
 260         },
 261       },
 262       elementArray
 263     );
 264   },
 265   methods: {
 266     mousedown: function(e) {
 267       e = e || window.event;
 268       let ingame = false;
 269       let elem = e.target;
 270       while (!ingame && elem !== null)
 271       {
 272         if (elem.classList.contains("game"))
 273         {
 274           ingame = true;
 275           break;
 276         }
 277         elem = elem.parentElement;
 278       }
 279       if (!ingame) //let default behavior (click on button...)
 280         return;
 281       e.preventDefault(); //disable native drag & drop
 282       if (!this.selectedPiece && e.target.classList.contains("piece"))
 283       {
 284         let parent = e.target.parentNode;
 285         // Next few lines to center the piece on mouse cursor
 286         let rect = parent.getBoundingClientRect();
 287         this.start = {
 288           x: rect.x + rect.width/2,
 289           y: rect.y + rect.width/2,
 290           id: parent.id
 291         };
 292         this.selectedPiece = e.target.cloneNode();
 293         let spStyle = this.selectedPiece.style
 294         spStyle.position = "absolute";
 295         spStyle.top = 0;
 296         spStyle.display = "inline-block";
 297         spStyle.zIndex = 3000;
 298         const startSquare = getSquareFromId(parent.id);
 299         this.possibleMoves = [];
 300         const color = (this.analyze ? this.vr.turn : this.userColor);
 301         if (this.vr.canIplay(color,startSquare))
 302           this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 303         // Next line add moving piece just after current image
 304         // (required for Crazyhouse reserve)
 305         parent.insertBefore(this.selectedPiece, e.target.nextSibling);
 306       }
 307     },
 308     mousemove: function(e) {
 309       if (!this.selectedPiece)
 310         return;
 311       e = e || window.event;
 312       // If there is an active element, move it around
 313       if (!!this.selectedPiece)
 314       {
 315         const [offsetX,offsetY] = !!e.clientX
 316           ? [e.clientX,e.clientY] //desktop browser
 317           : [e.changedTouches[0].pageX, e.changedTouches[0].pageY]; //smartphone
 318         this.selectedPiece.style.left = (offsetX-this.start.x) + "px";
 319         this.selectedPiece.style.top = (offsetY-this.start.y) + "px";
 320       }
 321     },
 322     mouseup: function(e) {
 323       if (!this.selectedPiece)
 324         return;
 325       e = e || window.event;
 326       this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coords
 327       const [offsetX,offsetY] = !!e.clientX
 328         ? [e.clientX,e.clientY]
 329         : [e.changedTouches[0].pageX, e.changedTouches[0].pageY];
 330       let landing = document.elementFromPoint(offsetX, offsetY);
 331       this.selectedPiece.style.zIndex = 3000;
 332       // Next condition: classList.contains(piece) fails because of marks
 333       while (landing.tagName == "IMG")
 334         landing = landing.parentNode;
 335       if (this.start.id == landing.id)
 336       {
 337         // A click: selectedPiece and possibleMoves are already filled
 338         return;
 339       }
 340       // OK: process move attempt, landing is a square node
 341       let endSquare = getSquareFromId(landing.id);
 342       let moves = this.findMatchingMoves(endSquare);
 343       this.possibleMoves = [];
 344       if (moves.length > 1)
 345         this.choices = moves;
 346       else if (moves.length==1)
 347         this.play(moves[0]);
 348       // Else: impossible move
 349       this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 350       delete this.selectedPiece;
 351       this.selectedPiece = null;
 352     },
 353     findMatchingMoves: function(endSquare) {
 354       // Run through moves list and return the matching set (if promotions...)
 355       let moves = [];
 356       this.possibleMoves.forEach(function(m) {
 357         if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
 358           moves.push(m);
 359       });
 360       return moves;
 361     },
 362     play: function(move) {
 363       this.$emit('play-move', move);
 364     },
 365   },
 366 };
 367 </script>
 368
 369 <style lang="sass" scoped>
 370 .game.reserve-div
 371   margin-bottom: 18px
 372
 373 .reserve-count
 374   padding-left: 40%
 375
 376 .reserve-row-1
 377   margin-bottom: 15px
 378
 379 // NOTE: no variants with reserve of size != 8
 380
 381 .game
 382   width: 100%
 383   margin: 0
 384   .board
 385     cursor: pointer
 386
 387 #choices
 388   margin: 0
 389   position: absolute
 390   z-index: 300
 391   overflow-y: inherit
 392   background-color: rgba(0,0,0,0)
 393   img
 394     cursor: pointer
 395     background-color: #e6ee9c
 396     &:hover
 397       background-color: skyblue
 398     &.choice-piece
 399       width: 100%
 400       height: auto
 401       display: block
 402
 403 img.ghost
 404   position: absolute
 405   opacity: 0.4
 406   top: 0
 407
 408 .highlight
 409   background-color: #00cc66 !important
 410
 411 .incheck
 412   background-color: #cc3300 !important
 413
 414 .light-square.lichess
 415   background-color: #f0d9b5;
 416 .dark-square.lichess
 417   background-color: #b58863;
 418
 419 .light-square.chesscom
 420   background-color: #e5e5ca;
 421 .dark-square.chesscom
 422   background-color: #6f8f57;
 423
 424 .light-square.chesstempo
 425   background-color: #fdfdfd;
 426 .dark-square.chesstempo
 427   background-color: #88a0a8;
 428 </style>