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   .float70 //TODO: use mini-css predefined styles
   9     Board(:vr="vr" :last-move="lastMove" :analyze="analyze"
  10       :user-color="game.mycolor" :orientation="orientation"
  11       :vname="game.vname" @play-move="play")
  12     .button-group
  13       button(@click="() => play()") Play
  14       button(@click="() => undo()") Undo
  15       button(@click="flip") Flip
  16       button(@click="gotoBegin") GotoBegin
  17       button(@click="gotoEnd") GotoEnd
  18     #fenDiv(v-if="showFen && !!vr")
  19       p {{ vr.getFen() }}
  20     #pgnDiv
  21       a#download(href="#")
  22       button(@click="download") {{ st.tr["Download PGN"] }}
  23   .float30 //TODO: should be optional (adjust widths dynamically)
  24     MoveList(v-if="showMoves"
  25       :moves="moves" :cursor="cursor" @goto-move="gotoMove")
  26 </template>
  27
  28 <script>
  29 import Board from "@/components/Board.vue";
  30 import MoveList from "@/components/MoveList.vue";
  31 import { store } from "@/store";
  32 import { getSquareId } from "@/utils/squareId";
  33 import { getDate } from "@/utils/datetime";
  34
  35 export default {
  36   name: 'my-base-game',
  37   components: {
  38     Board,
  39     MoveList,
  40   },
  41   // "vr": VariantRules object, describing the game state + rules
  42   props: ["vr","game"],
  43   data: function() {
  44     return {
  45       st: store.state,
  46       // NOTE: all following variables must be reset at the beginning of a game
  47       endgameMessage: "",
  48       orientation: "w",
  49       score: "*", //'*' means 'unfinished'
  50       moves: [],
  51       cursor: -1, //index of the move just played
  52       lastMove: null,
  53     };
  54   },
  55   watch: {
  56     // game initial FEN changes when a new game starts
  57     "game.fenStart": function() {
  58       this.re_setVariables();
  59     },
  60     // Received a new move to play:
  61     "game.moveToPlay": function() {
  62       this.play(this.game.moveToPlay, "receive", this.game.vname=="Dark");
  63     },
  64     "game.score": function() {
  65       this.endGame(this.game.score, this.game.scoreMsg);
  66     },
  67   },
  68   computed: {
  69     showMoves: function() {
  70       return true;
  71       //return window.innerWidth >= 768;
  72     },
  73     showFen: function() {
  74       return this.game.vname != "Dark" || this.score != "*";
  75     },
  76     analyze: function() {
  77       return this.game.mode == "analyze" || this.score != "*";
  78     },
  79   },
  80   created: function() {
  81     if (!!this.game.fenStart)
  82       this.re_setVariables();
  83   },
  84   methods: {
  85     re_setVariables: function() {
  86       this.endgameMessage = "";
  87       this.orientation = this.game.mycolor || "w"; //default orientation for observed games
  88       this.score = this.game.score || "*"; //mutable (if initially "*")
  89       this.moves = JSON.parse(JSON.stringify(this.game.moves || []));
  90       // Post-processing: decorate each move with color + current FEN:
  91       // (to be able to jump to any position quickly)
  92       let vr_tmp = new V(this.game.fenStart); //vr is already at end of game
  93       this.moves.forEach(move => {
  94         // NOTE: this is doing manually what play() function below achieve,
  95         // but in a lighter "fast-forward" way
  96         move.color = vr_tmp.turn;
  97         move.notation = vr_tmp.getNotation(move);
  98         vr_tmp.play(move);
  99         move.fen = vr_tmp.getFen();
 100       });
 101       const L = this.moves.length;
 102       this.cursor = L-1;
 103       this.lastMove = (L > 0 ? this.moves[L-1]  : null);
 104     },
 105     download: function() {
 106       const content = this.getPgn();
 107       // Prepare and trigger download link
 108       let downloadAnchor = document.getElementById("download");
 109       downloadAnchor.setAttribute("download", "game.pgn");
 110       downloadAnchor.href = "data:text/plain;charset=utf-8," + encodeURIComponent(content);
 111       downloadAnchor.click();
 112     },
 113     getPgn: function() {
 114       let pgn = "";
 115       pgn += '[Site "vchess.club"]\n';
 116       pgn += '[Variant "' + this.game.vname + '"]\n';
 117       pgn += '[Date "' + getDate(new Date()) + '"]\n';
 118       pgn += '[White "' + this.game.players[0].name + '"]\n';
 119       pgn += '[Black "' + this.game.players[1].name + '"]\n';
 120       pgn += '[Fen "' + this.game.fenStart + '"]\n';
 121       pgn += '[Result "' + this.score + '"]\n\n';
 122       let counter = 1;
 123       let i = 0;
 124       while (i < this.moves.length)
 125       {
 126         pgn += (counter++) + ".";
 127         for (let color of ["w","b"])
 128         {
 129           let move = "";
 130           while (i < this.moves.length && this.moves[i].color == color)
 131             move += this.moves[i++].notation + ",";
 132           move = move.slice(0,-1); //remove last comma
 133           pgn += move + (i < this.moves.length ? " " : "");
 134         }
 135       }
 136       return pgn + "\n";
 137     },
 138     getScoreMessage: function(score) {
 139       let eogMessage = "Undefined";
 140       switch (score)
 141       {
 142         case "1-0":
 143           eogMessage = this.st.tr["White win"];
 144           break;
 145         case "0-1":
 146           eogMessage = this.st.tr["Black win"];
 147           break;
 148         case "1/2":
 149           eogMessage = this.st.tr["Draw"];
 150           break;
 151         case "?":
 152           eogMessage = this.st.tr["Unfinished"];
 153           break;
 154       }
 155       return eogMessage;
 156     },
 157     showEndgameMsg: function(message) {
 158       this.endgameMessage = message;
 159       let modalBox = document.getElementById("modalEog");
 160       modalBox.checked = true;
 161       setTimeout(() => { modalBox.checked = false; }, 2000);
 162     },
 163     endGame: function(score, message) {
 164       this.score = score;
 165       if (!message)
 166         message = this.getScoreMessage(score);
 167       this.showEndgameMsg(score + " . " + message);
 168       this.$emit("gameover", score);
 169     },
 170     animateMove: function(move) {
 171       let startSquare = document.getElementById(getSquareId(move.start));
 172       let endSquare = document.getElementById(getSquareId(move.end));
 173       let rectStart = startSquare.getBoundingClientRect();
 174       let rectEnd = endSquare.getBoundingClientRect();
 175       let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
 176       let movingPiece =
 177         document.querySelector("#" + getSquareId(move.start) + " > img.piece");
 178       // HACK for animation (with positive translate, image slides "under background")
 179       // Possible improvement: just alter squares on the piece's way...
 180       const squares = document.getElementsByClassName("board");
 181       for (let i=0; i<squares.length; i++)
 182       {
 183         let square = squares.item(i);
 184         if (square.id != getSquareId(move.start))
 185           square.style.zIndex = "-1";
 186       }
 187       movingPiece.style.transform = "translate(" + translation.x + "px," +
 188         translation.y + "px)";
 189       movingPiece.style.transitionDuration = "0.2s";
 190       movingPiece.style.zIndex = "3000";
 191       setTimeout( () => {
 192         for (let i=0; i<squares.length; i++)
 193           squares.item(i).style.zIndex = "auto";
 194         movingPiece.style = {}; //required e.g. for 0-0 with KR swap
 195         this.play(move);
 196       }, 250);
 197     },
 198     play: function(move, receive, noanimate) {
 199       const navigate = !move;
 200       // Forbid playing outside analyze mode when cursor isn't at moves.length-1
 201       // (except if we receive opponent's move, human or computer)
 202       if (!navigate && !this.analyze && !receive
 203         && this.cursor < this.moves.length-1)
 204       {
 205         return;
 206       }
 207       if (navigate)
 208       {
 209         if (this.cursor == this.moves.length-1)
 210           return; //no more moves
 211         move = this.moves[this.cursor+1];
 212       }
 213       if (!!receive && !noanimate) //opponent move, variant != "Dark"
 214       {
 215         if (this.cursor < this.moves.length-1)
 216           this.gotoEnd(); //required to play the move
 217         return this.animateMove(move);
 218       }
 219       if (!navigate)
 220       {
 221         move.color = this.vr.turn;
 222         move.notation = this.vr.getNotation(move);
 223       }
 224       // Not programmatic, or animation is over
 225       this.vr.play(move);
 226       this.cursor++;
 227       this.lastMove = move;
 228       if (this.st.settings.sound == 2)
 229         new Audio("/sounds/move.mp3").play().catch(err => {});
 230       if (!navigate)
 231       {
 232         move.fen = this.vr.getFen();
 233         if (this.score == "*" || this.analyze)
 234         {
 235           // Stack move on movesList at current cursor
 236           if (this.cursor == this.moves.length)
 237             this.moves.push(move);
 238           else
 239             this.moves = this.moves.slice(0,this.cursor).concat([move]);
 240         }
 241       }
 242       if (!this.analyze)
 243         this.$emit("newmove", move); //post-processing (e.g. computer play)
 244       // Is opponent in check?
 245       this.incheck = this.vr.getCheckSquares(this.vr.turn);
 246       const score = this.vr.getCurrentScore();
 247       if (score != "*")
 248       {
 249         if (!this.analyze)
 250           this.endGame(score);
 251         else
 252         {
 253           // Just show score on screen (allow undo)
 254           const message = this.getScoreMessage(score);
 255           this.showEndgameMsg(score + " . " + message);
 256         }
 257       }
 258     },
 259     undo: function(move) {
 260       const navigate = !move;
 261       if (navigate)
 262       {
 263         if (this.cursor < 0)
 264           return; //no more moves
 265         move = this.moves[this.cursor];
 266       }
 267       this.vr.undo(move);
 268       this.cursor--;
 269       this.lastMove = (this.cursor >= 0 ? this.moves[this.cursor] : undefined);
 270       if (this.st.settings.sound == 2)
 271         new Audio("/sounds/undo.mp3").play().catch(err => {});
 272       this.incheck = this.vr.getCheckSquares(this.vr.turn);
 273       if (!navigate)
 274         this.moves.pop();
 275     },
 276     gotoMove: function(index) {
 277       this.vr.re_init(this.moves[index].fen);
 278       this.cursor = index;
 279       this.lastMove = this.moves[index];
 280     },
 281     gotoBegin: function() {
 282       this.vr.re_init(this.game.fenStart);
 283       this.cursor = -1;
 284       this.lastMove = null;
 285     },
 286     gotoEnd: function() {
 287       this.gotoMove(this.moves.length-1);
 288     },
 289     flip: function() {
 290       this.orientation = V.GetNextCol(this.orientation);
 291     },
 292   },
 293 };
 294 </script>