variants/Hex/class.js

   1 import ChessRules from "/base_rules.js";
   2 import PiPo from "/utils/PiPo.js";
   3 import Move from "/utils/Move.js";
   4
   5 export default class HexRules extends ChessRules {
   6
   7   static get Options() {
   8     return {
   9       input: [
  10         {
  11           label: "Board size",
  12           variable: "bsize",
  13           type: "number",
  14           defaut: 11
  15         },
  16         {
  17           label: "Swap",
  18           variable: "swap",
  19           type: "checkbox",
  20           defaut: true
  21         }
  22       ]
  23     };
  24   }
  25
  26   get hasFlags() {
  27     return false;
  28   }
  29   get hasEnpassant() {
  30     return false;
  31   }
  32   get hasReserve() {
  33     return false;
  34   }
  35   get noAnimate() {
  36     return true;
  37   }
  38   get clickOnly() {
  39     return true;
  40   }
  41
  42   doClick(coords) {
  43     if (
  44       this.playerColor != this.turn ||
  45       (
  46         this.board[coords.x][coords.y] != "" &&
  47         (!this.options["swap"] || this.movesCount >= 2)
  48       )
  49     ) {
  50       return null;
  51     }
  52     let res = new Move({
  53       start: {x: coords.x, y: coords.y},
  54       appear: [
  55         new PiPo({
  56           x: coords.x,
  57           y: coords.y,
  58           c: this.turn,
  59           p: 'p'
  60         })
  61       ],
  62       vanish: []
  63     });
  64     if (this.board[coords.x][coords.y] != "") {
  65       res.vanish.push(
  66         new PiPo({
  67           x: coords.x,
  68           y: coords.y,
  69           c: C.GetOppCol(this.turn),
  70           p: 'p'
  71         })
  72       );
  73     }
  74     return res;
  75   }
  76
  77   genRandInitBaseFen() {
  78     // NOTE: size.x == size.y (square boards)
  79     const emptyCount = C.FenEmptySquares(this.size.x);
  80     return {
  81       fen: (emptyCount + "/").repeat(this.size.x).slice(0, -1) + " w 0",
  82       o: {}
  83     };
  84   }
  85
  86   getSvgChessboard() {
  87     // NOTE: with small margin seems nicer
  88     let width = 173.2 * this.size.y + 173.2 * (this.size.y-1) / 2 + 30,
  89         height = 50 + Math.floor(150 * this.size.x) + 30,
  90         min_x = -86.6 - 15,
  91         min_y = -100 - 15;
  92     if (this.size.ratio < 1) {
  93       // Rotate by 30 degrees to display vertically
  94       [width, height] = [height, width];
  95       [min_x, min_y] = [min_y, min_x];
  96     }
  97     let board = `
  98       <svg
  99         viewBox="${min_x} ${min_y} ${width} ${height}"
 100         class="chessboard_SVG">
 101       <defs>
 102         <g id="hexa">
 103           <polygon
 104             style="stroke:#000000;stroke-width:1"
 105             points="0,-100.0 86.6,-50.0 86.6,50.0 0,100.0 -86.6,50.0 -86.6,-50.0"
 106           />
 107         </g>
 108       </defs>`;
 109     board += "<g";
 110     if (this.size.ratio < 1)
 111       board += ` transform="rotate(30)"`
 112     board += ">";
 113     for (let i=0; i < this.size.x; i++) {
 114       for (let j=0; j < this.size.y; j++) {
 115         board += `
 116           <use
 117             href="#hexa"
 118             class="neutral-square"
 119             id="${this.coordsToId({x: i, y: j})}"
 120             x="${173.2*j + 86.6*i}"
 121             y="${150*i}"
 122           />`;
 123       }
 124     }
 125     board += `</g><g style="fill:none;stroke-width:10"`;
 126     if (this.size.ratio < 1)
 127       board += ` transform="rotate(30)"`
 128     // Goals: up/down/left/right
 129     board += `><polyline style="stroke:red" points="`
 130     for (let i=0; i<=2*this.size.y; i++)
 131       board += ((i-1)*86.6) + ',' + (i % 2 == 0 ? -50 : -100) + ' ';
 132     board += `"/><polyline style="stroke:red" points="`;
 133     for (let i=1; i<=2*this.size.y; i++) {
 134       const jShift = 200 * Math.floor((this.size.y+1)/2) +
 135                      100 * (Math.floor(this.size.y/2) - 1) +
 136                      (i % 2 == 0 ? -50 : 0) +
 137                      (this.size.y % 2 == 0 ? 50 : 0);
 138       board += ((i+this.size.y-2)*86.6) + ',' + jShift + ' ';
 139     }
 140     board += `"/><polyline style="stroke:blue" points="`;
 141     let sumY = -100;
 142     for (let i=0; i<=2*this.size.x; i++) {
 143       board += ((Math.floor(i/2)-1) * 86.6) + ',' +
 144                (sumY += (i % 2 == 0 ? 50 : 100)) + ' ';
 145     }
 146     board += `"/><polyline style="stroke:blue" points="`;
 147     sumY = -100;
 148     for (let i=0; i<2*this.size.x; i++) {
 149       board += (173.2*this.size.x + (Math.floor(i/2)-1) * 86.6) + ',' +
 150                (sumY += (i % 2 == 0 ? 50 : 100)) + ' ';
 151     }
 152     board += `"/></g></svg>`;
 153     return board;
 154   }
 155
 156   setupPieces() {
 157     for (let i=0; i<this.size.x; i++) {
 158       for (let j=0; j<this.size.y; j++) {
 159         if (this.board[i][j] != "") {
 160           const sqColor = (this.getColor(i, j) == 'w' ? "white" : "black");
 161           const elt = document.getElementById(this.coordsToId({x: i, y: j}));
 162           elt.classList.remove("neutral-square");
 163           elt.classList.add("bg-" + sqColor);
 164         }
 165       }
 166     }
 167   }
 168
 169   get size() {
 170     const baseRatio = 1.6191907514450865; //2801.2 / 1730, "widescreen"
 171     const rc =
 172       document.getElementById(this.containerId).getBoundingClientRect();
 173     const rotate = rc.width < rc.height; //"vertical screen"
 174     return {
 175       x: this.options["bsize"],
 176       y: this.options["bsize"],
 177       ratio: (rotate ? 1 / baseRatio : baseRatio)
 178     };
 179   }
 180
 181   play(move) {
 182     this.playOnBoard(move);
 183     this.movesCount++;
 184     this.turn = C.GetOppCol(this.turn);
 185   }
 186
 187   getCurrentScore(move) {
 188     const oppCol = C.GetOppCol(this.turn);
 189     // Search for connecting path of opp color:
 190     let explored = {}, component;
 191     let min, max;
 192     const getIndex = (x, y) => x + "." + y;
 193     // Explore one connected component:
 194     const neighborsSearch = ([x, y], index) => {
 195       // Let's say "white" connects on x and "black" on y
 196       const z = (oppCol == 'w' ? x : y);
 197       if (z < min)
 198         min = z;
 199       if (z > max)
 200         max = z;
 201       explored[index] = true;
 202       component[index] = true;
 203       for (let [dx, dy] of super.pieces()['k'].moves[0].steps) {
 204         const [nx, ny] = [x + dx, y + dy];
 205         const nidx = getIndex(nx, ny);
 206         if (
 207           this.onBoard(nx, ny) &&
 208           this.getColor(nx, ny) == oppCol &&
 209           !component[nidx]
 210         ) {
 211           neighborsSearch([nx, ny], nidx);
 212         }
 213       }
 214     };
 215     // Explore all components:
 216     for (let i=0; i<this.size.x; i++) {
 217       for (let j=0; j<this.size.y; j++) {
 218         const index = getIndex(i, j);
 219         if (this.getColor(i, j) == oppCol && !explored[index]) {
 220           component = {};
 221           [min, max] = [this.size.x, 0];
 222           neighborsSearch([i, j], index);
 223           if (max - min == this.size.x - 1)
 224             return (oppCol == "w" ? "1-0" : "0-1");
 225         }
 226       }
 227     }
 228     return "*";
 229   }
 230
 231   playVisual(move) {
 232     move.vanish.forEach(v => {
 233       let elt = document.getElementById(this.coordsToId({x: v.x, y: v.y}));
 234       elt.classList.remove("bg-" + (v.c == 'w' ? "white" : "black"));
 235     });
 236     move.appear.forEach(a => {
 237       let elt = document.getElementById(this.coordsToId({x: a.x, y: a.y}));
 238       elt.classList.add("bg-" + (a.c == 'w' ? "white" : "black"));
 239     });
 240   }
 241
 242 };