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