variants/Coregal/class.js

   1 import { ChessRules, Move, PiPo } from "@/base_rules";
   2 import { ArrayFun } from "@/utils/array";
   3 import { randInt, sample } from "@/utils/alea";
   4
   5 export class CoregalRules extends ChessRules {
   6
   7 //TODO: CSS royal queen symbol
   8
   9   genRandInitBaseFen() {
  10     const s = FenUtil.setupPieces(
  11       ['r', 'n', 'b', 'l', 'k', 'b', 'n', 'r'],
  12       {
  13         randomness: this.options["randomness"],
  14         between: [{p1: 'k', p2: 'r'}, {p1: 'l', p2: 'r'}],
  15         diffCol: ['b'],
  16         flags: ['r', 'k', 'l'] //TODO: add 'k' to all 'flags' calls ??!
  17       }
  18     );
  19     return {
  20       fen: s.b.join("") + "/pppppppp/8/8/8/8/PPPPPPPP/" +
  21            s.w.join("").toUpperCase(),
  22       o: {flags: s.flags}
  23     };
  24   }
  25
  26   pieces() {
  27     let res = super.pieces();
  28     res['l'] = JSON.parse(JSON.stringify(res['q']));
  29     res['l']["class"] = "royal_queen";
  30     return res;
  31   }
  32
  33   setFlags(fenflags) {
  34     // white pieces positions, then black pieces positions
  35     this.castleFlags = { w: [...Array(4)], b: [...Array(4)] };
  36     for (let i = 0; i < 8; i++) {
  37       this.castleFlags[i < 4 ? "w" : "b"][i % 4] =
  38         parseInt(fenflags.charAt(i), 10);
  39     }
  40   }
  41
  42   isKing(x, y, p) {
  43     if (!p)
  44       p = this.getPiece(x, y);
  45     ['k', 'l'].includes(p); //no cannibal mode
  46   }
  47
  48   getCastleMoves([x, y]) {
  49     // Relative position of the selected piece: left or right ?
  50     // If left: small castle left, large castle right.
  51     // If right: usual situation.
  52     const c = this.getColor(x, y);
  53     const relPos = (this.castleFlags[c][1] == y ? "left" : "right");
  54
  55     const finalSquares = [
  56       relPos == "left" ? [1, 2] : [2, 3],
  57       relPos == "right" ? [6, 5] : [5, 4]
  58     ];
  59     const saveFlags = JSON.stringify(this.castleFlags[c]);
  60     // Alter flags to follow base_rules semantic
  61     this.castleFlags[c] = [0, 3].map(i => this.castleFlags[c][i]);
  62     const moves = super.getCastleMoves([x, y], finalSquares);
  63     this.castleFlags[c] = JSON.parse(saveFlags);
  64     return moves;
  65   }
  66
  67 };