variants/Coregal/class.js

   1 import ChessRules from "/base_rules.js";
   2
   3 export default class CoregalRules extends ChessRules {
   4
   5   genRandInitBaseFen() {
   6     const s = FenUtil.setupPieces(
   7       ['r', 'n', 'b', 'l', 'k', 'b', 'n', 'r'],
   8       {
   9         randomness: this.options["randomness"],
  10         between: [{p1: 'k', p2: 'r'}, {p1: 'l', p2: 'r'}],
  11         diffCol: ['b'],
  12         // 'k' and 'l' useful only to get relative position
  13         flags: ['r', 'k', 'l']
  14       }
  15     );
  16     return {
  17       fen: s.b.join("") + "/pppppppp/8/8/8/8/PPPPPPPP/" +
  18            s.w.join("").toUpperCase(),
  19       // TODO: re-arrange flags, use another init variable "relPos" (in o)
  20       // (maybe after FEN parsing, easier?)
  21       o: {flags: s.flags + s.flags} //second set for royal queen
  22     };
  23   }
  24
  25   pieces() {
  26     let res = super.pieces();
  27     res['l'] = JSON.parse(JSON.stringify(res['q']));
  28     // TODO: CSS royal queen symbol (with cross?)
  29     res['l']["class"] = "royal_queen";
  30     return res;
  31   }
  32
  33   // TODO: something like that indeed (+ flags to FEN)
  34   setFlags(fenflags) {
  35     this.castleFlags = {
  36       'k': { 'w': [...Array(4)], b: [...Array(4)] },
  37       'l': { 'w': [...Array(4)], b: [...Array(4)] }
  38     };
  39     for (let i = 0; i < 8; i++) {
  40       this.castleFlags[i < 4 ? "k" : "l"][i % 4 < 2 ? "w" : "b"] =
  41         parseInt(fenflags.charAt(i), 10);
  42     }
  43   }
  44
  45   isKing(x, y, p) {
  46     if (!p)
  47       p = this.getPiece(x, y);
  48     ['k', 'l'].includes(p); //no cannibal mode
  49   }
  50
  51   getCastleMoves([x, y]) {
  52     const c = this.getColor(x, y),
  53           p = this.getPiece(x, y);
  54     // Relative position of the selected piece: left or right ?
  55     // If left: small castle left, large castle right.
  56     // If right: usual situation.
  57     const finalSquares = [
  58       this.relPos[c][p] == "left" ? [1, 2] : [2, 3],
  59       this.relPos[c][p] == "right" ? [6, 5] : [5, 4]
  60     ];
  61     const moves =
  62       super.getCastleMoves([x, y], finalSquares, null, this.castleFlags[p]);
  63     return moves;
  64   }
  65
  66   // TODO: updateFlags (just pass castleFlags arg)
  67
  68 };