client/src/components/Board.vue

   1 <script>
   2 // This can work for squared boards (2 or 4 players), with some adaptations (TODO)
   3 // TODO: for 3 players, write a "board3.js"
   4
   5 import { getSquareId, getSquareFromId } from "@/utils/squareId";
   6 import { ArrayFun } from "@/utils/array";
   7
   8 export default {
   9   name: 'my-board',
  10   // Last move cannot be guessed from here, and is required to highlight squares
  11   // vr: object to check moves, print board...
  12   // mode: HH, HC or analyze
  13   // userColor: for mode HH or HC
  14   props: ["vr","lastMove","mode","orientation","userColor","vname"],
  15   data: function () {
  16     return {
  17       hints: (!localStorage["hints"] ? true : localStorage["hints"] === "1"),
  18       bcolor: localStorage["bcolor"] || "lichess", //lichess, chesscom or chesstempo
  19       possibleMoves: [], //filled after each valid click/dragstart
  20       choices: [], //promotion pieces, or checkered captures... (as moves)
  21       selectedPiece: null, //moving piece (or clicked piece)
  22       incheck: [],
  23       start: {}, //pixels coordinates + id of starting square (click or drag)
  24     };
  25   },
  26   render(h) {
  27     if (!this.vr)
  28       return;
  29     const [sizeX,sizeY] = [V.size.x,V.size.y];
  30     // Precompute hints squares to facilitate rendering
  31     let hintSquares = ArrayFun.init(sizeX, sizeY, false);
  32     this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
  33     // Also precompute in-check squares
  34     let incheckSq = ArrayFun.init(sizeX, sizeY, false);
  35     this.incheck.forEach(sq => { incheckSq[sq[0]][sq[1]] = true; });
  36     const squareWidth = 40; //TODO: compute this
  37     const choices = h(
  38       'div',
  39       {
  40         attrs: { "id": "choices" },
  41         'class': { 'row': true },
  42         style: {
  43           "display": this.choices.length>0?"block":"none",
  44           "top": "-" + ((sizeY/2)*squareWidth+squareWidth/2) + "px",
  45           "width": (this.choices.length * squareWidth) + "px",
  46           "height": squareWidth + "px",
  47         },
  48       },
  49       this.choices.map(m => { //a "choice" is a move
  50         return h('div',
  51           {
  52             'class': {
  53               'board': true,
  54               ['board'+sizeY]: true,
  55             },
  56             style: {
  57               'width': (100/this.choices.length) + "%",
  58               'padding-bottom': (100/this.choices.length) + "%",
  59             },
  60           },
  61           [h('img',
  62             {
  63               attrs: { "src": '/images/pieces/' +
  64                 V.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
  65               'class': { 'choice-piece': true },
  66               on: {
  67                 "click": e => { this.play(m); this.choices=[]; },
  68                 // NOTE: add 'touchstart' event to fix a problem on smartphones
  69                 "touchstart": e => { this.play(m); this.choices=[]; },
  70               },
  71             })
  72           ]
  73         );
  74       })
  75     );
  76     // Create board element (+ reserves if needed by variant or mode)
  77     const lm = this.lastMove;
  78     const showLight = this.hints && this.vname != "Dark";
  79     const gameDiv = h(
  80       'div',
  81       {
  82         'class': {
  83           'game': true,
  84           'clearer': true,
  85         },
  86       },
  87       [...Array(sizeX).keys()].map(i => {
  88         let ci = (this.orientation=='w' ? i : sizeX-i-1);
  89         return h(
  90           'div',
  91           {
  92             'class': {
  93               'row': true,
  94             },
  95             style: { 'opacity': this.choices.length>0?"0.5":"1" },
  96           },
  97           [...Array(sizeY).keys()].map(j => {
  98             let cj = (this.orientation=='w' ? j : sizeY-j-1);
  99             let elems = [];
 100             if (this.vr.board[ci][cj] != V.EMPTY && (this.vname!="Dark"
 101               || this.gameOver || this.mode == "analyze"
 102               || this.vr.enlightened[this.userColor][ci][cj]))
 103             {
 104               elems.push(
 105                 h(
 106                   'img',
 107                   {
 108                     'class': {
 109                       'piece': true,
 110                       'ghost': !!this.selectedPiece
 111                         && this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
 112                     },
 113                     attrs: {
 114                       src: require("@/assets/images/pieces/" +
 115                         V.getPpath(this.vr.board[ci][cj]) + ".svg"),
 116                     },
 117                   }
 118                 )
 119               );
 120             }
 121             if (this.hints && hintSquares[ci][cj])
 122             {
 123               elems.push(
 124                 h(
 125                   'img',
 126                   {
 127                     'class': {
 128                       'mark-square': true,
 129                     },
 130                     attrs: {
 131                       src: "/images/mark.svg",
 132                     },
 133                   }
 134                 )
 135               );
 136             }
 137             return h(
 138               'div',
 139               {
 140                 'class': {
 141                   'board': true,
 142                   ['board'+sizeY]: true,
 143                   'light-square': (i+j)%2==0,
 144                   'dark-square': (i+j)%2==1,
 145                   [this.bcolor]: true,
 146                   'in-shadow': this.vname=="Dark" && !this.gameOver
 147                     && this.mode != "analyze"
 148                     && !this.vr.enlightened[this.userColor][ci][cj],
 149                   'highlight': showLight && !!lm && lm.end.x == ci && lm.end.y == cj,
 150                   'incheck': showLight && incheckSq[ci][cj],
 151                 },
 152                 attrs: {
 153                   id: getSquareId({x:ci,y:cj}),
 154                 },
 155               },
 156               elems
 157             );
 158           })
 159         );
 160       })
 161     );
 162     let elementArray = [choices, gameDiv];
 163     if (!!this.vr.reserve)
 164     {
 165       const shiftIdx = (this.userColor=="w" ? 0 : 1);
 166       let myReservePiecesArray = [];
 167       for (let i=0; i<V.RESERVE_PIECES.length; i++)
 168       {
 169         myReservePiecesArray.push(h('div',
 170         {
 171           'class': {'board':true, ['board'+sizeY]:true},
 172           attrs: { id: getSquareId({x:sizeX+shiftIdx,y:i}) }
 173         },
 174         [
 175           h('img',
 176           {
 177             'class': {"piece":true, "reserve":true},
 178             attrs: {
 179               "src": "/images/pieces/" +
 180                 this.vr.getReservePpath(this.userColor,i) + ".svg",
 181             }
 182           }),
 183           h('sup',
 184             {"class": { "reserve-count": true } },
 185             [ this.vr.reserve[this.userColor][V.RESERVE_PIECES[i]] ]
 186           )
 187         ]));
 188       }
 189       let oppReservePiecesArray = [];
 190       const oppCol = V.GetOppCol(this.userColor);
 191       for (let i=0; i<V.RESERVE_PIECES.length; i++)
 192       {
 193         oppReservePiecesArray.push(h('div',
 194         {
 195           'class': {'board':true, ['board'+sizeY]:true},
 196           attrs: { id: getSquareId({x:sizeX+(1-shiftIdx),y:i}) }
 197         },
 198         [
 199           h('img',
 200           {
 201             'class': {"piece":true, "reserve":true},
 202             attrs: {
 203               "src": "/images/pieces/" +
 204                 this.vr.getReservePpath(oppCol,i) + ".svg",
 205             }
 206           }),
 207           h('sup',
 208             {"class": { "reserve-count": true } },
 209             [ this.vr.reserve[oppCol][V.RESERVE_PIECES[i]] ]
 210           )
 211         ]));
 212       }
 213       let reserves = h('div',
 214         {
 215           'class':{
 216             'game': true,
 217             "reserve-div": true,
 218           },
 219         },
 220         [
 221           h('div',
 222             {
 223               'class': {
 224                 'row': true,
 225                 "reserve-row-1": true,
 226               },
 227             },
 228             myReservePiecesArray
 229           ),
 230           h('div',
 231             { 'class': { 'row': true }},
 232             oppReservePiecesArray
 233           )
 234         ]
 235       );
 236       elementArray.push(reserves);
 237     }
 238     return h(
 239       'div',
 240       {
 241         'class': {
 242           "col-sm-12": true,
 243           "col-md-10": true,
 244           "col-md-offset-1": true,
 245           "col-lg-8": true,
 246           "col-lg-offset-2": true,
 247         },
 248         // NOTE: click = mousedown + mouseup
 249         on: {
 250           mousedown: this.mousedown,
 251           mousemove: this.mousemove,
 252           mouseup: this.mouseup,
 253           touchstart: this.mousedown,
 254           touchmove: this.mousemove,
 255           touchend: this.mouseup,
 256         },
 257       },
 258       elementArray
 259     );
 260   },
 261   methods: {
 262     mousedown: function(e) {
 263       e = e || window.event;
 264       let ingame = false;
 265       let elem = e.target;
 266       while (!ingame && elem !== null)
 267       {
 268         if (elem.classList.contains("game"))
 269         {
 270           ingame = true;
 271           break;
 272         }
 273         elem = elem.parentElement;
 274       }
 275       if (!ingame) //let default behavior (click on button...)
 276         return;
 277       e.preventDefault(); //disable native drag & drop
 278       if (!this.selectedPiece && e.target.classList.contains("piece"))
 279       {
 280         // Next few lines to center the piece on mouse cursor
 281         let rect = e.target.parentNode.getBoundingClientRect();
 282         this.start = {
 283           x: rect.x + rect.width/2,
 284           y: rect.y + rect.width/2,
 285           id: e.target.parentNode.id
 286         };
 287         this.selectedPiece = e.target.cloneNode();
 288         this.selectedPiece.style.position = "absolute";
 289         this.selectedPiece.style.top = 0;
 290         this.selectedPiece.style.display = "inline-block";
 291         this.selectedPiece.style.zIndex = 3000;
 292         const startSquare = getSquareFromId(e.target.parentNode.id);
 293         this.possibleMoves = [];
 294         const color = this.mode=="analyze" || this.gameOver
 295           ? this.vr.turn
 296           : this.userColor;
 297         if (this.vr.canIplay(color,startSquare))
 298           this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
 299         // Next line add moving piece just after current image
 300         // (required for Crazyhouse reserve)
 301         e.target.parentNode.insertBefore(this.selectedPiece, e.target.nextSibling);
 302       }
 303     },
 304     mousemove: function(e) {
 305       if (!this.selectedPiece)
 306         return;
 307       e = e || window.event;
 308       // If there is an active element, move it around
 309       if (!!this.selectedPiece)
 310       {
 311         const [offsetX,offsetY] = !!e.clientX
 312           ? [e.clientX,e.clientY] //desktop browser
 313           : [e.changedTouches[0].pageX, e.changedTouches[0].pageY]; //smartphone
 314         this.selectedPiece.style.left = (offsetX-this.start.x) + "px";
 315         this.selectedPiece.style.top = (offsetY-this.start.y) + "px";
 316       }
 317     },
 318     mouseup: function(e) {
 319       if (!this.selectedPiece)
 320         return;
 321       e = e || window.event;
 322       // Read drop target (or parentElement, parentNode... if type == "img")
 323       this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coords
 324       const [offsetX,offsetY] = !!e.clientX
 325         ? [e.clientX,e.clientY]
 326         : [e.changedTouches[0].pageX, e.changedTouches[0].pageY];
 327       let landing = document.elementFromPoint(offsetX, offsetY);
 328       this.selectedPiece.style.zIndex = 3000;
 329       // Next condition: classList.contains(piece) fails because of marks
 330       while (landing.tagName == "IMG")
 331         landing = landing.parentNode;
 332       if (this.start.id == landing.id)
 333       {
 334         // A click: selectedPiece and possibleMoves are already filled
 335         return;
 336       }
 337       // OK: process move attempt
 338       let endSquare = getSquareFromId(landing.id);
 339       let moves = this.findMatchingMoves(endSquare);
 340       this.possibleMoves = [];
 341       if (moves.length > 1)
 342         this.choices = moves;
 343       else if (moves.length==1)
 344         this.play(moves[0]);
 345       // Else: impossible move
 346       this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 347       delete this.selectedPiece;
 348       this.selectedPiece = null;
 349     },
 350     findMatchingMoves: function(endSquare) {
 351       // Run through moves list and return the matching set (if promotions...)
 352       let moves = [];
 353       this.possibleMoves.forEach(function(m) {
 354         if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
 355           moves.push(m);
 356       });
 357       return moves;
 358     },
 359     play: function(move) {
 360       this.$emit('play-move', move);
 361     },
 362   },
 363 };
 364 </script>
 365
 366 <style lang="sass">
 367 // TODO: styles to see pieces!
 368 </style>