client/src/components/BaseGame.vue

   1 <template lang="pug">
   2 div
   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="() => play()") Play
  15         button(@click="() => undo()") Undo
  16         button(@click="flip") Flip
  17         button(@click="gotoBegin") GotoBegin
  18         button(@click="gotoEnd") 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     };
  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() {
  63       this.play(this.game.moveToPlay, "receive", this.game.vname=="Dark");
  64     },
  65     "game.score": function(score) {
  66       if (score != "*")
  67         this.endGame(score, this.game.scoreMsg);
  68     },
  69   },
  70   computed: {
  71     showMoves: function() {
  72       return true;
  73       //return window.innerWidth >= 768;
  74     },
  75     showFen: function() {
  76       return this.game.vname != "Dark" || this.score != "*";
  77     },
  78     analyze: function() {
  79       return this.game.mode == "analyze" || this.score != "*";
  80     },
  81   },
  82   created: function() {
  83     if (!!this.game.fenStart)
  84       this.re_setVariables();
  85   },
  86   methods: {
  87     re_setVariables: function() {
  88       this.endgameMessage = "";
  89       this.orientation = this.game.mycolor || "w"; //default orientation for observed games
  90       this.score = this.game.score || "*"; //mutable (if initially "*")
  91       this.moves = JSON.parse(JSON.stringify(this.game.moves || []));
  92       // Post-processing: decorate each move with color + current FEN:
  93       // (to be able to jump to any position quickly)
  94       let vr_tmp = new V(this.game.fenStart); //vr is already at end of game
  95       this.moves.forEach(move => {
  96         // NOTE: this is doing manually what play() function below achieve,
  97         // but in a lighter "fast-forward" way
  98         move.color = vr_tmp.turn;
  99         move.notation = vr_tmp.getNotation(move);
 100         vr_tmp.play(move);
 101         move.fen = vr_tmp.getFen();
 102       });
 103       if (this.game.fenStart.indexOf(" b ") >= 0 ||
 104         (this.moves.length > 0 && this.moves[0].color == "b"))
 105       {
 106         // 'end' is required for Board component to check lastMove for e.p.
 107         this.moves.unshift({color: "w", notation: "...", end: {x:-1,y:-1}});
 108       }
 109       const L = this.moves.length;
 110       this.cursor = L-1;
 111       this.lastMove = (L > 0 ? this.moves[L-1]  : null);
 112     },
 113     gotoFenContent: function(event) {
 114       this.$router.push("/analyze/" + this.game.vname +
 115         "/?fen=" + event.target.innerText.replace(/ /g, "_"));
 116     },
 117     download: function() {
 118       const content = this.getPgn();
 119       // Prepare and trigger download link
 120       let downloadAnchor = document.getElementById("download");
 121       downloadAnchor.setAttribute("download", "game.pgn");
 122       downloadAnchor.href = "data:text/plain;charset=utf-8," + encodeURIComponent(content);
 123       downloadAnchor.click();
 124     },
 125     getPgn: function() {
 126       let pgn = "";
 127       pgn += '[Site "vchess.club"]\n';
 128       pgn += '[Variant "' + this.game.vname + '"]\n';
 129       pgn += '[Date "' + getDate(new Date()) + '"]\n';
 130       pgn += '[White "' + this.game.players[0].name + '"]\n';
 131       pgn += '[Black "' + this.game.players[1].name + '"]\n';
 132       pgn += '[Fen "' + this.game.fenStart + '"]\n';
 133       pgn += '[Result "' + this.score + '"]\n\n';
 134       let counter = 1;
 135       let i = 0;
 136       while (i < this.moves.length)
 137       {
 138         pgn += (counter++) + ".";
 139         for (let color of ["w","b"])
 140         {
 141           let move = "";
 142           while (i < this.moves.length && this.moves[i].color == color)
 143             move += this.moves[i++].notation + ",";
 144           move = move.slice(0,-1); //remove last comma
 145           pgn += move + (i < this.moves.length ? " " : "");
 146         }
 147       }
 148       return pgn + "\n";
 149     },
 150     getScoreMessage: function(score) {
 151       let eogMessage = "Undefined";
 152       switch (score)
 153       {
 154         case "1-0":
 155           eogMessage = this.st.tr["White win"];
 156           break;
 157         case "0-1":
 158           eogMessage = this.st.tr["Black win"];
 159           break;
 160         case "1/2":
 161           eogMessage = this.st.tr["Draw"];
 162           break;
 163         case "?":
 164           eogMessage = this.st.tr["Unfinished"];
 165           break;
 166       }
 167       return eogMessage;
 168     },
 169     showEndgameMsg: function(message) {
 170       this.endgameMessage = message;
 171       let modalBox = document.getElementById("modalEog");
 172       modalBox.checked = true;
 173       setTimeout(() => { modalBox.checked = false; }, 2000);
 174     },
 175     endGame: function(score, message) {
 176       this.score = score;
 177       if (!message)
 178         message = this.getScoreMessage(score);
 179       this.showEndgameMsg(score + " . " + message);
 180       this.$emit("gameover", score);
 181     },
 182     animateMove: function(move) {
 183       let startSquare = document.getElementById(getSquareId(move.start));
 184       let endSquare = document.getElementById(getSquareId(move.end));
 185       let rectStart = startSquare.getBoundingClientRect();
 186       let rectEnd = endSquare.getBoundingClientRect();
 187       let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
 188       let movingPiece =
 189         document.querySelector("#" + getSquareId(move.start) + " > img.piece");
 190       // HACK for animation (with positive translate, image slides "under background")
 191       // Possible improvement: just alter squares on the piece's way...
 192       const squares = document.getElementsByClassName("board");
 193       for (let i=0; i<squares.length; i++)
 194       {
 195         let square = squares.item(i);
 196         if (square.id != getSquareId(move.start))
 197           square.style.zIndex = "-1";
 198       }
 199       movingPiece.style.transform = "translate(" + translation.x + "px," +
 200         translation.y + "px)";
 201       movingPiece.style.transitionDuration = "0.2s";
 202       movingPiece.style.zIndex = "3000";
 203       setTimeout( () => {
 204         for (let i=0; i<squares.length; i++)
 205           squares.item(i).style.zIndex = "auto";
 206         movingPiece.style = {}; //required e.g. for 0-0 with KR swap
 207         this.play(move);
 208       }, 250);
 209     },
 210     play: function(move, receive, noanimate) {
 211       const navigate = !move;
 212       // Forbid playing outside analyze mode when cursor isn't at moves.length-1
 213       // (except if we receive opponent's move, human or computer)
 214       if (!navigate && !this.analyze && !receive
 215         && this.cursor < this.moves.length-1)
 216       {
 217         return;
 218       }
 219       if (navigate)
 220       {
 221         if (this.cursor == this.moves.length-1)
 222           return; //no more moves
 223         move = this.moves[this.cursor+1];
 224       }
 225       if (!!receive && !noanimate) //opponent move, variant != "Dark"
 226       {
 227         if (this.cursor < this.moves.length-1)
 228           this.gotoEnd(); //required to play the move
 229         return this.animateMove(move);
 230       }
 231       if (!navigate)
 232       {
 233         move.color = this.vr.turn;
 234         move.notation = this.vr.getNotation(move);
 235       }
 236       // Not programmatic, or animation is over
 237       this.vr.play(move);
 238       this.cursor++;
 239       this.lastMove = move;
 240       if (this.st.settings.sound == 2)
 241         new Audio("/sounds/move.mp3").play().catch(err => {});
 242       if (!navigate)
 243       {
 244         move.fen = this.vr.getFen();
 245         if (this.score == "*" || this.analyze)
 246         {
 247           // Stack move on movesList at current cursor
 248           if (this.cursor == this.moves.length)
 249             this.moves.push(move);
 250           else
 251             this.moves = this.moves.slice(0,this.cursor).concat([move]);
 252         }
 253       }
 254       if (!this.analyze)
 255         this.$emit("newmove", move); //post-processing (e.g. computer play)
 256       // Is opponent in check?
 257       this.incheck = this.vr.getCheckSquares(this.vr.turn);
 258       const score = this.vr.getCurrentScore();
 259       if (score != "*")
 260       {
 261         if (!this.analyze)
 262           this.endGame(score);
 263         else
 264         {
 265           // Just show score on screen (allow undo)
 266           const message = this.getScoreMessage(score);
 267           this.showEndgameMsg(score + " . " + message);
 268         }
 269       }
 270     },
 271     undo: function(move) {
 272       const navigate = !move;
 273       if (navigate)
 274       {
 275         if (this.cursor < 0)
 276           return; //no more moves
 277         move = this.moves[this.cursor];
 278       }
 279       this.vr.undo(move);
 280       this.cursor--;
 281       this.lastMove = (this.cursor >= 0 ? this.moves[this.cursor] : undefined);
 282       if (this.st.settings.sound == 2)
 283         new Audio("/sounds/undo.mp3").play().catch(err => {});
 284       this.incheck = this.vr.getCheckSquares(this.vr.turn);
 285       if (!navigate)
 286         this.moves.pop();
 287     },
 288     gotoMove: function(index) {
 289       this.vr.re_init(this.moves[index].fen);
 290       this.cursor = index;
 291       this.lastMove = this.moves[index];
 292     },
 293     gotoBegin: function() {
 294       this.vr.re_init(this.game.fenStart);
 295       this.cursor = -1;
 296       this.lastMove = null;
 297     },
 298     gotoEnd: function() {
 299       this.gotoMove(this.moves.length-1);
 300     },
 301     flip: function() {
 302       this.orientation = V.GetNextCol(this.orientation);
 303     },
 304   },
 305 };
 306 </script>