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