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