client/src/components/BaseGame.vue

   1 <template lang="pug">
   2 div#baseGame(tabindex=-1 @click="() => focusBg()" @keydown="handleKeys")
   3   input#modalEog.modal(type="checkbox")
   4   div(role="dialog" aria-labelledby="eogMessage")
   5     .card.smallpad.small-modal.text-center
   6       label.modal-close(for="modalEog")
   7       h3#eogMessage.section {{ endgameMessage }}
   8   .row
   9     #boardContainer.col-sm-12.col-md-9
  10       Board(:vr="vr" :last-move="lastMove" :analyze="game.mode=='analyze'"
  11         :user-color="game.mycolor" :orientation="orientation"
  12         :vname="game.vname" @play-move="play")
  13       #controls
  14         button(@click="gotoBegin") <<
  15         button(@click="() => undo()") <
  16         button(@click="flip") &#8645;
  17         button(@click="() => play()") >
  18         button(@click="gotoEnd") >>
  19       #pgnDiv
  20         a#download(href="#")
  21         button(@click="download") {{ st.tr["Download PGN"] }}
  22         button(v-if="game.mode!='analyze'" @click="analyzePosition")
  23           | {{ st.tr["Analyze"] }}
  24     .col-sm-12.col-md-3
  25       MoveList(v-if="showMoves" :score="game.score" :message="game.scoreMsg"
  26         :firstNum="firstMoveNumber" :moves="moves" :cursor="cursor"
  27         @goto-move="gotoMove")
  28 </template>
  29
  30 <script>
  31 import Board from "@/components/Board.vue";
  32 import MoveList from "@/components/MoveList.vue";
  33 import { store } from "@/store";
  34 import { getSquareId } from "@/utils/squareId";
  35 import { getDate } from "@/utils/datetime";
  36
  37 export default {
  38   name: 'my-base-game',
  39   components: {
  40     Board,
  41     MoveList,
  42   },
  43   // "vr": VariantRules object, describing the game state + rules
  44   props: ["vr","game"],
  45   data: function() {
  46     return {
  47       st: store.state,
  48       // NOTE: all following variables must be reset at the beginning of a game
  49       endgameMessage: "",
  50       orientation: "w",
  51       score: "*", //'*' means 'unfinished'
  52       moves: [],
  53       cursor: -1, //index of the move just played
  54       lastMove: null,
  55       firstMoveNumber: 0, //for printing
  56     };
  57   },
  58   watch: {
  59     // game initial FEN changes when a new game starts
  60     "game.fenStart": function() {
  61       this.re_setVariables();
  62     },
  63     // Received a new move to play:
  64     "game.moveToPlay": function(newMove) {
  65       if (!!newMove) //if stop + launch new game, get undefined move
  66         this.play(newMove, "receive");
  67     },
  68   },
  69   computed: {
  70     showMoves: function() {
  71       return this.game.vname != "Dark" || this.game.mode=="analyze";
  72     },
  73   },
  74   created: function() {
  75     if (!!this.game.fenStart)
  76       this.re_setVariables();
  77   },
  78   methods: {
  79     focusBg: function() {
  80       // TODO: small blue border appears...
  81       document.getElementById("baseGame").focus();
  82     },
  83     handleKeys: function(e) {
  84       if ([32,37,38,39,40].includes(e.keyCode))
  85         e.preventDefault();
  86       switch (e.keyCode)
  87       {
  88         case 37:
  89           this.undo();
  90           break;
  91         case 39:
  92           this.play();
  93           break;
  94         case 38:
  95           this.gotoBegin();
  96           break;
  97         case 40:
  98           this.gotoEnd();
  99           break;
 100         case 32:
 101           this.flip();
 102           break;
 103       }
 104     },
 105     re_setVariables: function() {
 106       this.endgameMessage = "";
 107       this.orientation = this.game.mycolor || "w"; //default orientation for observed games
 108       this.moves = JSON.parse(JSON.stringify(this.game.moves || []));
 109       // Post-processing: decorate each move with color + current FEN:
 110       // (to be able to jump to any position quickly)
 111       let vr_tmp = new V(this.game.fenStart); //vr is already at end of game
 112       this.firstMoveNumber =
 113         Math.floor(V.ParseFen(this.game.fenStart).movesCount / 2);
 114       this.moves.forEach(move => {
 115         // NOTE: this is doing manually what play() function below achieve,
 116         // but in a lighter "fast-forward" way
 117         move.color = vr_tmp.turn;
 118         move.notation = vr_tmp.getNotation(move);
 119         vr_tmp.play(move);
 120         move.fen = vr_tmp.getFen();
 121       });
 122       if (this.game.fenStart.indexOf(" b ") >= 0 ||
 123         (this.moves.length > 0 && this.moves[0].color == "b"))
 124       {
 125         // 'end' is required for Board component to check lastMove for e.p.
 126         this.moves.unshift({color: "w", notation: "...", end: {x:-1,y:-1}});
 127       }
 128       const L = this.moves.length;
 129       this.cursor = L-1;
 130       this.lastMove = (L > 0 ? this.moves[L-1]  : null);
 131     },
 132     analyzePosition: function() {
 133       const newUrl = "/analyze/" + this.game.vname +
 134         "/?fen=" + this.vr.getFen().replace(/ /g, "_");
 135       //window.open("#" + newUrl); //to open in a new tab
 136       this.$router.push(newUrl); //better
 137     },
 138     download: function() {
 139       const content = this.getPgn();
 140       // Prepare and trigger download link
 141       let downloadAnchor = document.getElementById("download");
 142       downloadAnchor.setAttribute("download", "game.pgn");
 143       downloadAnchor.href = "data:text/plain;charset=utf-8," + encodeURIComponent(content);
 144       downloadAnchor.click();
 145     },
 146     getPgn: function() {
 147       let pgn = "";
 148       pgn += '[Site "vchess.club"]\n';
 149       pgn += '[Variant "' + this.game.vname + '"]\n';
 150       pgn += '[Date "' + getDate(new Date()) + '"]\n';
 151       pgn += '[White "' + this.game.players[0].name + '"]\n';
 152       pgn += '[Black "' + this.game.players[1].name + '"]\n';
 153       pgn += '[Fen "' + this.game.fenStart + '"]\n';
 154       pgn += '[Result "' + this.game.score + '"]\n\n';
 155       let counter = 1;
 156       let i = 0;
 157       while (i < this.moves.length)
 158       {
 159         pgn += (counter++) + ".";
 160         for (let color of ["w","b"])
 161         {
 162           let move = "";
 163           while (i < this.moves.length && this.moves[i].color == color)
 164             move += this.moves[i++].notation + ",";
 165           move = move.slice(0,-1); //remove last comma
 166           pgn += move + (i < this.moves.length ? " " : "");
 167         }
 168       }
 169       return pgn + "\n";
 170     },
 171     getScoreMessage: function(score) {
 172       let eogMessage = "Undefined";
 173       switch (score)
 174       {
 175         case "1-0":
 176           eogMessage = this.st.tr["White win"];
 177           break;
 178         case "0-1":
 179           eogMessage = this.st.tr["Black win"];
 180           break;
 181         case "1/2":
 182           eogMessage = this.st.tr["Draw"];
 183           break;
 184         case "?":
 185           eogMessage = this.st.tr["Unfinished"];
 186           break;
 187       }
 188       return eogMessage;
 189     },
 190     showEndgameMsg: function(message) {
 191       this.endgameMessage = message;
 192       let modalBox = document.getElementById("modalEog");
 193       modalBox.checked = true;
 194       setTimeout(() => { modalBox.checked = false; }, 2000);
 195     },
 196     animateMove: function(move, callback) {
 197       let startSquare = document.getElementById(getSquareId(move.start));
 198       let endSquare = document.getElementById(getSquareId(move.end));
 199       let rectStart = startSquare.getBoundingClientRect();
 200       let rectEnd = endSquare.getBoundingClientRect();
 201       let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
 202       let movingPiece =
 203         document.querySelector("#" + getSquareId(move.start) + " > img.piece");
 204       // HACK for animation (with positive translate, image slides "under background")
 205       // Possible improvement: just alter squares on the piece's way...
 206       const squares = document.getElementsByClassName("board");
 207       for (let i=0; i<squares.length; i++)
 208       {
 209         let square = squares.item(i);
 210         if (square.id != getSquareId(move.start))
 211           square.style.zIndex = "-1";
 212       }
 213       movingPiece.style.transform = "translate(" + translation.x + "px," +
 214         translation.y + "px)";
 215       movingPiece.style.transitionDuration = "0.2s";
 216       movingPiece.style.zIndex = "3000";
 217       setTimeout( () => {
 218         for (let i=0; i<squares.length; i++)
 219           squares.item(i).style.zIndex = "auto";
 220         movingPiece.style = {}; //required e.g. for 0-0 with KR swap
 221         callback();
 222       }, 250);
 223     },
 224     play: function(move, receive) {
 225       // NOTE: navigate and receive are mutually exclusive
 226       const navigate = !move;
 227       // Forbid playing outside analyze mode, except if move is received.
 228       // Sufficient condition because Board already knows which turn it is.
 229       if (!navigate && this.game.mode!="analyze" && !receive
 230         && this.cursor < this.moves.length-1)
 231       {
 232         return;
 233       }
 234       const doPlayMove = () => {
 235         if (!!receive && this.cursor < this.moves.length-1)
 236           this.gotoEnd(); //required to play the move
 237         if (navigate)
 238         {
 239           if (this.cursor == this.moves.length-1)
 240             return; //no more moves
 241           move = this.moves[this.cursor+1];
 242         }
 243         else
 244         {
 245           move.color = this.vr.turn;
 246           move.notation = this.vr.getNotation(move);
 247         }
 248         this.vr.play(move);
 249         this.cursor++;
 250         this.lastMove = move;
 251         if (this.st.settings.sound == 2)
 252           new Audio("/sounds/move.mp3").play().catch(err => {});
 253         if (!navigate)
 254         {
 255           move.fen = this.vr.getFen();
 256           // Stack move on movesList at current cursor
 257           if (this.cursor == this.moves.length)
 258             this.moves.push(move);
 259           else
 260             this.moves = this.moves.slice(0,this.cursor).concat([move]);
 261         }
 262         if (!navigate && this.game.mode != "analyze")
 263           this.$emit("newmove", move); //post-processing (e.g. computer play)
 264         // Is opponent in check?
 265         this.incheck = this.vr.getCheckSquares(this.vr.turn);
 266         const score = this.vr.getCurrentScore();
 267         if (score != "*")
 268         {
 269           const message = this.getScoreMessage(score);
 270           if (this.game.mode != "analyze")
 271             this.$emit("gameover", score, message);
 272           else //just show score on screen (allow undo)
 273             this.showEndgameMsg(score + " . " + message);
 274         }
 275       };
 276       if (!!receive && this.game.vname != "Dark")
 277         this.animateMove(move, doPlayMove);
 278       else
 279         doPlayMove();
 280     },
 281     undo: function(move) {
 282       const navigate = !move;
 283       if (navigate)
 284       {
 285         if (this.cursor < 0)
 286           return; //no more moves
 287         move = this.moves[this.cursor];
 288       }
 289       this.vr.undo(move);
 290       this.cursor--;
 291       this.lastMove = (this.cursor >= 0 ? this.moves[this.cursor] : undefined);
 292       if (this.st.settings.sound == 2)
 293         new Audio("/sounds/undo.mp3").play().catch(err => {});
 294       this.incheck = this.vr.getCheckSquares(this.vr.turn);
 295       if (!navigate)
 296         this.moves.pop();
 297     },
 298     gotoMove: function(index) {
 299       this.vr.re_init(this.moves[index].fen);
 300       this.cursor = index;
 301       this.lastMove = this.moves[index];
 302     },
 303     gotoBegin: function() {
 304       if (this.cursor == -1)
 305         return;
 306       this.vr.re_init(this.game.fenStart);
 307       if (this.moves.length > 0 && this.moves[0].notation == "...")
 308       {
 309         this.cursor = 0;
 310         this.lastMove = this.moves[0];
 311       }
 312       else
 313       {
 314         this.cursor = -1;
 315         this.lastMove = null;
 316       }
 317     },
 318     gotoEnd: function() {
 319       if (this.cursor == this.moves.length - 1)
 320         return;
 321       this.gotoMove(this.moves.length-1);
 322     },
 323     flip: function() {
 324       this.orientation = V.GetNextCol(this.orientation);
 325     },
 326   },
 327 };
 328 </script>
 329
 330 <style lang="sass">
 331 #modal-eog+div .card
 332   overflow: hidden
 333 #pgnDiv
 334   text-align: center
 335   margin-left: auto
 336   margin-right: auto
 337 @media screen and (min-width: 768px)
 338   #controls
 339     width: 400px
 340 @media screen and (max-width: 767px)
 341   .game
 342     width: 100%
 343 #controls
 344   margin-top: 10px
 345   button
 346     display: inline-block
 347     width: 20%
 348     margin: 0
 349 #boardContainer
 350   //margin-top: 5px
 351   >div
 352     margin-left: auto
 353     margin-right: auto
 354 </style>