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