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   genRandInitFen() {
  78     // NOTE: size.x == size.y (square boards)
  79     const emptyCount = C.FenEmptySquares(this.size.x);
  80     return (emptyCount + "/").repeat(this.size.x).slice(0, -1) + " w 0";
  81   }
  82
  83   getSvgChessboard() {
  84     // NOTE: with small margin seems nicer
  85     let width = 173.2 * this.size.y + 173.2 * (this.size.y-1) / 2 + 30,
  86         height = 50 + Math.floor(150 * this.size.x) + 30,
  87         min_x = -86.6 - 15,
  88         min_y = -100 - 15;
  89     if (this.size.ratio < 1) {
  90       // Rotate by 30 degrees to display vertically
  91       [width, height] = [height, width];
  92       [min_x, min_y] = [min_y, min_x];
  93     }
  94     let board = `
  95       <svg
  96         viewBox="${min_x} ${min_y} ${width} ${height}"
  97         class="chessboard_SVG">
  98       <defs>
  99         <g id="hexa">
 100           <polygon
 101             style="stroke:#000000;stroke-width:1"
 102             points="0,-100.0 86.6,-50.0 86.6,50.0 0,100.0 -86.6,50.0 -86.6,-50.0"
 103           />
 104         </g>
 105       </defs>`;
 106     board += "<g";
 107     if (this.size.ratio < 1)
 108       board += ` transform="rotate(30)"`
 109     board += ">";
 110     for (let i=0; i < this.size.x; i++) {
 111       for (let j=0; j < this.size.y; j++) {
 112         board += `
 113           <use
 114             href="#hexa"
 115             class="neutral-square"
 116             id="${this.coordsToId({x: i, y: j})}"
 117             x="${173.2*j + 86.6*i}"
 118             y="${150*i}"
 119           />`;
 120       }
 121     }
 122     board += `</g><g style="fill:none;stroke-width:10"`;
 123     if (this.size.ratio < 1)
 124       board += ` transform="rotate(30)"`
 125     // Goals: up/down/left/right
 126     board += `><polyline style="stroke:red" points="`
 127     for (let i=0; i<=2*this.size.y; i++)
 128       board += ((i-1)*86.6) + ',' + (i % 2 == 0 ? -50 : -100) + ' ';
 129     board += `"/><polyline style="stroke:red" points="`;
 130     for (let i=1; i<=2*this.size.y; i++) {
 131       const jShift = 200 * Math.floor((this.size.y+1)/2) +
 132                      100 * (Math.floor(this.size.y/2) - 1) +
 133                      (i % 2 == 0 ? -50 : 0) +
 134                      (this.size.y % 2 == 0 ? 50 : 0);
 135       board += ((i+this.size.y-2)*86.6) + ',' + jShift + ' ';
 136     }
 137     board += `"/><polyline style="stroke:blue" points="`;
 138     let sumY = -100;
 139     for (let i=0; i<=2*this.size.x; i++) {
 140       board += ((Math.floor(i/2)-1) * 86.6) + ',' +
 141                (sumY += (i % 2 == 0 ? 50 : 100)) + ' ';
 142     }
 143     board += `"/><polyline style="stroke:blue" points="`;
 144     sumY = -100;
 145     for (let i=0; i<2*this.size.x; i++) {
 146       board += (173.2*this.size.x + (Math.floor(i/2)-1) * 86.6) + ',' +
 147                (sumY += (i % 2 == 0 ? 50 : 100)) + ' ';
 148     }
 149     board += `"/></g></svg>`;
 150     return board;
 151   }
 152
 153   setupPieces() {
 154     for (let i=0; i<this.size.x; i++) {
 155       for (let j=0; j<this.size.y; j++) {
 156         if (this.board[i][j] != "") {
 157           const sqColor = (this.getColor(i, j) == 'w' ? "white" : "black");
 158           const elt = document.getElementById(this.coordsToId({x: i, y: j}));
 159           elt.classList.remove("neutral-square");
 160           elt.classList.add("bg-" + sqColor);
 161         }
 162       }
 163     }
 164   }
 165
 166   get size() {
 167     const baseRatio = 1.6191907514450865; //2801.2 / 1730, "widescreen"
 168     const rotate = window.innerWidth < window.innerHeight; //"vertical screen"
 169     return {
 170       x: this.options["bsize"],
 171       y: this.options["bsize"],
 172       ratio: (rotate ? 1 / baseRatio : baseRatio)
 173     };
 174   }
 175
 176   play(move) {
 177     this.playOnBoard(move);
 178     this.movesCount++;
 179     this.turn = C.GetOppCol(this.turn);
 180   }
 181
 182   getCurrentScore(move) {
 183     const oppCol = C.GetOppCol(this.turn);
 184     // Search for connecting path of opp color:
 185     let explored = {}, component;
 186     let min, max;
 187     const getIndex = (x, y) => x + "." + y;
 188     // Explore one connected component:
 189     const neighborsSearch = ([x, y], index) => {
 190       // Let's say "white" connects on x and "black" on y
 191       const z = (oppCol == 'w' ? x : y);
 192       if (z < min)
 193         min = z;
 194       if (z > max)
 195         max = z;
 196       explored[index] = true;
 197       component[index] = true;
 198       for (let [dx, dy] of super.pieces()['k'].moves[0].steps) {
 199         const [nx, ny] = [x + dx, y + dy];
 200         const nidx = getIndex(nx, ny);
 201         if (
 202           this.onBoard(nx, ny) &&
 203           this.getColor(nx, ny) == oppCol &&
 204           !component[nidx]
 205         ) {
 206           neighborsSearch([nx, ny], nidx);
 207         }
 208       }
 209     };
 210     // Explore all components:
 211     for (let i=0; i<this.size.x; i++) {
 212       for (let j=0; j<this.size.y; j++) {
 213         const index = getIndex(i, j);
 214         if (this.getColor(i, j) == oppCol && !explored[index]) {
 215           component = {};
 216           [min, max] = [this.size.x, 0];
 217           neighborsSearch([i, j], index);
 218           if (max - min == this.size.x - 1)
 219             return (oppCol == "w" ? "1-0" : "0-1");
 220         }
 221       }
 222     }
 223     return "*";
 224   }
 225
 226   playVisual(move) {
 227     move.vanish.forEach(v => {
 228       let elt = document.getElementById(this.coordsToId({x: v.x, y: v.y}));
 229       elt.classList.remove("bg-" + (v.c == 'w' ? "white" : "black"));
 230     });
 231     move.appear.forEach(a => {
 232       let elt = document.getElementById(this.coordsToId({x: a.x, y: a.y}));
 233       elt.classList.add("bg-" + (a.c == 'w' ? "white" : "black"));
 234     });
 235   }
 236
 237 };