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
  36   get noAnimate() {
  37     return true;
  38   }
  39
  40   doClick(coords) {
  41     if (
  42       this.playerColor != this.turn ||
  43       (
  44         this.board[coords.x][coords.y] != "" &&
  45         (!this.options["swap"] || this.movesCount >= 2)
  46       )
  47     ) {
  48       return null;
  49     }
  50     let res = new Move({
  51       start: {x: coords.x, y: coords.y},
  52       appear: [
  53         new PiPo({
  54           x: coords.x,
  55           y: coords.y,
  56           c: this.turn,
  57           p: 'p'
  58         })
  59       ],
  60       vanish: []
  61     });
  62     if (this.board[coords.x][coords.y] != "") {
  63       res.vanish.push(
  64         new PiPo({
  65           x: coords.x,
  66           y: coords.y,
  67           c: C.GetOppCol(this.turn),
  68           p: 'p'
  69         })
  70       );
  71     }
  72     return res;
  73   }
  74
  75   genRandInitFen() {
  76     // NOTE: size.x == size.y (square boards)
  77     const emptyCount = C.FenEmptySquares(this.size.x);
  78     return (emptyCount + "/").repeat(this.size.x).slice(0, -1) + " w 0";
  79   }
  80
  81   getSvgChessboard() {
  82     // NOTE: with small margin seems nicer
  83     let width = 173.2 * this.size.y + 173.2 * (this.size.y-1) / 2 + 30,
  84         height = 50 + Math.floor(150 * this.size.x) + 30,
  85         min_x = -86.6 - 15,
  86         min_y = -100 - 15;
  87     if (this.size.ratio < 1) {
  88       // Rotate by 30 degrees to display vertically
  89       [width, height] = [height, width];
  90       [min_x, min_y] = [min_y, min_x];
  91     }
  92     let board = `
  93       <svg
  94         viewBox="${min_x} ${min_y} ${width} ${height}"
  95         class="chessboard_SVG">
  96       <defs>
  97         <g id="hexa">
  98           <polygon
  99             style="stroke:#000000;stroke-width:1"
 100             points="0,-100.0 86.6,-50.0 86.6,50.0 0,100.0 -86.6,50.0 -86.6,-50.0"
 101           />
 102         </g>
 103       </defs>`;
 104     board += "<g";
 105     if (this.size.ratio < 1)
 106       board += ` transform="rotate(30)"`
 107     board += ">";
 108     for (let i=0; i < this.size.x; i++) {
 109       for (let j=0; j < this.size.y; j++) {
 110         board += `
 111           <use
 112             href="#hexa"
 113             class="neutral-square"
 114             id="${this.coordsToId({x: i, y: j})}"
 115             x="${173.2*j + 86.6*i}"
 116             y="${150*i}"
 117           />`;
 118       }
 119     }
 120     board += `</g><g style="fill:none;stroke-width:10"`;
 121     if (this.size.ratio < 1)
 122       board += ` transform="rotate(30)"`
 123     // Goals: up/down/left/right
 124     board += `><polyline style="stroke:red" points="`
 125     for (let i=0; i<=2*this.size.y; i++)
 126       board += ((i-1)*86.6) + ',' + (i % 2 == 0 ? -50 : -100) + ' ';
 127     board += `"/><polyline style="stroke:red" points="`;
 128     for (let i=1; i<=2*this.size.y; i++) {
 129       const jShift = 200 * Math.floor((this.size.y+1)/2) +
 130                      100 * (Math.floor(this.size.y/2) - 1) +
 131                      (i % 2 == 0 ? -50 : 0) +
 132                      (this.size.y % 2 == 0 ? 50 : 0);
 133       board += ((i+this.size.y-2)*86.6) + ',' + jShift + ' ';
 134     }
 135     board += `"/><polyline style="stroke:blue" points="`;
 136     let sumY = -100;
 137     for (let i=0; i<=2*this.size.x; i++) {
 138       board += ((Math.floor(i/2)-1) * 86.6) + ',' +
 139                (sumY += (i % 2 == 0 ? 50 : 100)) + ' ';
 140     }
 141     board += `"/><polyline style="stroke:blue" points="`;
 142     sumY = -100;
 143     for (let i=0; i<2*this.size.x; i++) {
 144       board += (173.2*this.size.x + (Math.floor(i/2)-1) * 86.6) + ',' +
 145                (sumY += (i % 2 == 0 ? 50 : 100)) + ' ';
 146     }
 147     board += `"/></g></svg>`;
 148     return board;
 149   }
 150
 151   setupPieces() {
 152     for (let i=0; i<this.size.x; i++) {
 153       for (let j=0; j<this.size.y; j++) {
 154         if (this.board[i][j] != "") {
 155           const sqColor = (this.getColor(i, j) == 'w' ? "white" : "black");
 156           const elt = document.getElementById(this.coordsToId({x: i, y: j}));
 157           elt.classList.remove("neutral-square");
 158           elt.classList.add("bg-" + sqColor);
 159         }
 160       }
 161     }
 162   }
 163
 164   initMouseEvents() {
 165     const mousedown = (e) => {
 166       if (e.touches && e.touches.length > 1)
 167         e.preventDefault();
 168       const cd = this.idToCoords(e.target.id);
 169       if (cd) {
 170         const move = this.doClick(cd);
 171         if (move)
 172           this.playPlusVisual(move);
 173       }
 174     };
 175
 176     if ('onmousedown' in window) {
 177       document.addEventListener("mousedown", mousedown);
 178       document.addEventListener("wheel",
 179         (e) => this.rescale(e.deltaY < 0 ? "up" : "down"));
 180     }
 181     if ('ontouchstart' in window)
 182       document.addEventListener("touchstart", mousedown, {passive: false});
 183   }
 184
 185   get size() {
 186     const baseRatio = 1.6191907514450865; //2801.2 / 1730, "widescreen"
 187     const rotate = window.innerWidth < window.innerHeight; //"vertical screen"
 188     return {
 189       x: this.options["bsize"],
 190       y: this.options["bsize"],
 191       ratio: (rotate ? 1 / baseRatio : baseRatio)
 192     };
 193   }
 194
 195   play(move) {
 196     this.playOnBoard(move);
 197     this.movesCount++;
 198     this.turn = C.GetOppCol(this.turn);
 199   }
 200
 201   getCurrentScore(move) {
 202     const oppCol = C.GetOppCol(this.turn);
 203     // Search for connecting path of opp color:
 204     let explored = {}, component;
 205     let min, max;
 206     const getIndex = (x, y) => x + "." + y;
 207     // Explore one connected component:
 208     const neighborsSearch = ([x, y], index) => {
 209       // Let's say "white" connects on x and "black" on y
 210       const z = (oppCol == 'w' ? x : y);
 211       if (z < min)
 212         min = z;
 213       if (z > max)
 214         max = z;
 215       explored[index] = true;
 216       component[index] = true;
 217       for (let [dx, dy] of super.pieces()['k'].moves[0].steps) {
 218         const [nx, ny] = [x + dx, y + dy];
 219         const nidx = getIndex(nx, ny);
 220         if (
 221           this.onBoard(nx, ny) &&
 222           this.getColor(nx, ny) == oppCol &&
 223           !component[nidx]
 224         ) {
 225           neighborsSearch([nx, ny], nidx);
 226         }
 227       }
 228     };
 229     // Explore all components:
 230     for (let i=0; i<this.size.x; i++) {
 231       for (let j=0; j<this.size.y; j++) {
 232         const index = getIndex(i, j);
 233         if (this.getColor(i, j) == oppCol && !explored[index]) {
 234           component = {};
 235           [min, max] = [this.size.x, 0];
 236           neighborsSearch([i, j], index);
 237           if (max - min == this.size.x - 1)
 238             return (oppCol == "w" ? "1-0" : "0-1");
 239         }
 240       }
 241     }
 242     return "*";
 243   }
 244
 245   playVisual(move) {
 246     move.vanish.forEach(v => {
 247       let elt = document.getElementById(this.coordsToId({x: v.x, y: v.y}));
 248       elt.classList.remove("bg-" + (v.c == 'w' ? "white" : "black"));
 249     });
 250     move.appear.forEach(a => {
 251       let elt = document.getElementById(this.coordsToId({x: a.x, y: a.y}));
 252       elt.classList.add("bg-" + (a.c == 'w' ? "white" : "black"));
 253     });
 254   }
 255
 256 };