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.col-lg-8
  10       Board(:vr="vr" :last-move="lastMove" :analyze="analyze"
  11         :user-color="game.mycolor" :orientation="orientation"
  12         :vname="game.vname" @play-move="play")
  13       .button-group
  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.col-lg-4
  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       switch (e.keyCode)
  97       {
  98         case 37:
  99           this.undo();
 100           break;
 101         case 39:
 102           this.play();
 103           break;
 104         case 28:
 105           this.gotoBegin();
 106           break;
 107         case 40:
 108           this.gotoEnd();
 109           break;
 110         case 32:
 111           e.preventDefault();
 112           this.flip();
 113           break;
 114       }
 115     },
 116     re_setVariables: function() {
 117       this.endgameMessage = "";
 118       this.orientation = this.game.mycolor || "w"; //default orientation for observed games
 119       this.score = this.game.score || "*"; //mutable (if initially "*")
 120       this.gameHasEnded = (this.score != "*");
 121       this.moves = JSON.parse(JSON.stringify(this.game.moves || []));
 122       // Post-processing: decorate each move with color + current FEN:
 123       // (to be able to jump to any position quickly)
 124       let vr_tmp = new V(this.game.fenStart); //vr is already at end of game
 125       this.moves.forEach(move => {
 126         // NOTE: this is doing manually what play() function below achieve,
 127         // but in a lighter "fast-forward" way
 128         move.color = vr_tmp.turn;
 129         move.notation = vr_tmp.getNotation(move);
 130         vr_tmp.play(move);
 131         move.fen = vr_tmp.getFen();
 132       });
 133       if (this.game.fenStart.indexOf(" b ") >= 0 ||
 134         (this.moves.length > 0 && this.moves[0].color == "b"))
 135       {
 136         // 'end' is required for Board component to check lastMove for e.p.
 137         this.moves.unshift({color: "w", notation: "...", end: {x:-1,y:-1}});
 138       }
 139       const L = this.moves.length;
 140       this.cursor = L-1;
 141       this.lastMove = (L > 0 ? this.moves[L-1]  : null);
 142     },
 143     gotoFenContent: function(event) {
 144       this.$router.push("/analyze/" + this.game.vname +
 145         "/?fen=" + event.target.innerText.replace(/ /g, "_"));
 146     },
 147     download: function() {
 148       const content = this.getPgn();
 149       // Prepare and trigger download link
 150       let downloadAnchor = document.getElementById("download");
 151       downloadAnchor.setAttribute("download", "game.pgn");
 152       downloadAnchor.href = "data:text/plain;charset=utf-8," + encodeURIComponent(content);
 153       downloadAnchor.click();
 154     },
 155     getPgn: function() {
 156       let pgn = "";
 157       pgn += '[Site "vchess.club"]\n';
 158       pgn += '[Variant "' + this.game.vname + '"]\n';
 159       pgn += '[Date "' + getDate(new Date()) + '"]\n';
 160       pgn += '[White "' + this.game.players[0].name + '"]\n';
 161       pgn += '[Black "' + this.game.players[1].name + '"]\n';
 162       pgn += '[Fen "' + this.game.fenStart + '"]\n';
 163       pgn += '[Result "' + this.score + '"]\n\n';
 164       let counter = 1;
 165       let i = 0;
 166       while (i < this.moves.length)
 167       {
 168         pgn += (counter++) + ".";
 169         for (let color of ["w","b"])
 170         {
 171           let move = "";
 172           while (i < this.moves.length && this.moves[i].color == color)
 173             move += this.moves[i++].notation + ",";
 174           move = move.slice(0,-1); //remove last comma
 175           pgn += move + (i < this.moves.length ? " " : "");
 176         }
 177       }
 178       return pgn + "\n";
 179     },
 180     getScoreMessage: function(score) {
 181       let eogMessage = "Undefined";
 182       switch (score)
 183       {
 184         case "1-0":
 185           eogMessage = this.st.tr["White win"];
 186           break;
 187         case "0-1":
 188           eogMessage = this.st.tr["Black win"];
 189           break;
 190         case "1/2":
 191           eogMessage = this.st.tr["Draw"];
 192           break;
 193         case "?":
 194           eogMessage = this.st.tr["Unfinished"];
 195           break;
 196       }
 197       return eogMessage;
 198     },
 199     showEndgameMsg: function(message) {
 200       this.endgameMessage = message;
 201       let modalBox = document.getElementById("modalEog");
 202       modalBox.checked = true;
 203       setTimeout(() => { modalBox.checked = false; }, 2000);
 204     },
 205     endGame: function(score, message, bubbleUp) {
 206       this.gameHasEnded = true;
 207       this.score = score;
 208       if (!message)
 209         message = this.getScoreMessage(score);
 210       this.showEndgameMsg(score + " . " + message);
 211       if (bubbleUp)
 212         this.$emit("gameover", score);
 213     },
 214     animateMove: function(move) {
 215       let startSquare = document.getElementById(getSquareId(move.start));
 216       let endSquare = document.getElementById(getSquareId(move.end));
 217       let rectStart = startSquare.getBoundingClientRect();
 218       let rectEnd = endSquare.getBoundingClientRect();
 219       let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
 220       let movingPiece =
 221         document.querySelector("#" + getSquareId(move.start) + " > img.piece");
 222       // HACK for animation (with positive translate, image slides "under background")
 223       // Possible improvement: just alter squares on the piece's way...
 224       const squares = document.getElementsByClassName("board");
 225       for (let i=0; i<squares.length; i++)
 226       {
 227         let square = squares.item(i);
 228         if (square.id != getSquareId(move.start))
 229           square.style.zIndex = "-1";
 230       }
 231       movingPiece.style.transform = "translate(" + translation.x + "px," +
 232         translation.y + "px)";
 233       movingPiece.style.transitionDuration = "0.2s";
 234       movingPiece.style.zIndex = "3000";
 235       setTimeout( () => {
 236         for (let i=0; i<squares.length; i++)
 237           squares.item(i).style.zIndex = "auto";
 238         movingPiece.style = {}; //required e.g. for 0-0 with KR swap
 239         this.play(move);
 240       }, 250);
 241     },
 242     play: function(move, receive, noanimate) {
 243       const navigate = !move;
 244       // Forbid playing outside analyze mode when cursor isn't at moves.length-1
 245       // (except if we receive opponent's move, human or computer)
 246       if (!navigate && !this.analyze && !receive
 247         && this.cursor < this.moves.length-1)
 248       {
 249         return;
 250       }
 251       if (navigate)
 252       {
 253         if (this.cursor == this.moves.length-1)
 254           return; //no more moves
 255         move = this.moves[this.cursor+1];
 256       }
 257       if (!!receive && !noanimate) //opponent move, variant != "Dark"
 258       {
 259         if (this.cursor < this.moves.length-1)
 260           this.gotoEnd(); //required to play the move
 261         return this.animateMove(move);
 262       }
 263       if (!navigate)
 264       {
 265         move.color = this.vr.turn;
 266         move.notation = this.vr.getNotation(move);
 267       }
 268       // Not programmatic, or animation is over
 269       this.vr.play(move);
 270       this.cursor++;
 271       this.lastMove = move;
 272       if (this.st.settings.sound == 2)
 273         new Audio("/sounds/move.mp3").play().catch(err => {});
 274       if (!navigate)
 275       {
 276         move.fen = this.vr.getFen();
 277         if (this.score == "*" || this.analyze)
 278         {
 279           // Stack move on movesList at current cursor
 280           if (this.cursor == this.moves.length)
 281             this.moves.push(move);
 282           else
 283             this.moves = this.moves.slice(0,this.cursor).concat([move]);
 284         }
 285       }
 286       if (!this.analyze)
 287         this.$emit("newmove", move); //post-processing (e.g. computer play)
 288       // Is opponent in check?
 289       this.incheck = this.vr.getCheckSquares(this.vr.turn);
 290       const score = this.vr.getCurrentScore();
 291       if (score != "*")
 292       {
 293         if (!this.analyze)
 294           this.endGame(score, undefined, true);
 295         else
 296         {
 297           // Just show score on screen (allow undo)
 298           const message = this.getScoreMessage(score);
 299           this.showEndgameMsg(score + " . " + message);
 300         }
 301       }
 302     },
 303     undo: function(move) {
 304       const navigate = !move;
 305       if (navigate)
 306       {
 307         if (this.cursor < 0)
 308           return; //no more moves
 309         move = this.moves[this.cursor];
 310       }
 311       this.vr.undo(move);
 312       this.cursor--;
 313       this.lastMove = (this.cursor >= 0 ? this.moves[this.cursor] : undefined);
 314       if (this.st.settings.sound == 2)
 315         new Audio("/sounds/undo.mp3").play().catch(err => {});
 316       this.incheck = this.vr.getCheckSquares(this.vr.turn);
 317       if (!navigate)
 318         this.moves.pop();
 319     },
 320     gotoMove: function(index) {
 321       this.vr.re_init(this.moves[index].fen);
 322       this.cursor = index;
 323       this.lastMove = this.moves[index];
 324     },
 325     gotoBegin: function() {
 326       this.vr.re_init(this.game.fenStart);
 327       this.cursor = -1;
 328       this.lastMove = null;
 329     },
 330     gotoEnd: function() {
 331       this.gotoMove(this.moves.length-1);
 332     },
 333     flip: function() {
 334       this.orientation = V.GetNextCol(this.orientation);
 335     },
 336   },
 337 };
 338 </script>