client/src/variants/Titan.js

   1 import { ChessRules } from "@/base_rules";
   2
   3 export class TitanRules extends ChessRules {
   4   // Idea: yellow = bishop, orange = knight (for white)
   5   // and, red = bishop + purple = knight (black side)
   6   // (avoid using a bigger board, or complicated drawings)
   7
   8   // Decode if normal piece, or + bishop or knight
   9   getPiece(i, j) {
  10     const piece = this.board[i][j].charAt(1);
  11     if (ChessRules.PIECES.includes(piece)) return piece;
  12     // Augmented piece:
  13     switch (piece) {
  14       case 'a':
  15       case 'c':
  16         return 'b';
  17       case 'j':
  18       case 'l':
  19         return 'k';
  20       case 'm':
  21       case 'o':
  22         return 'n';
  23       case 's':
  24       case 't':
  25         return 'q';
  26       case 'u':
  27       case 'v':
  28         return 'r';
  29     }
  30   }
  31
  32   // TODO: subtelty, castle forbidden if
  33
  34   // Code: a/c = bishop + knight/bishop j/l for king,
  35   // m/o for knight, s/t for queen, u/v for rook
  36   static get AUGMENTED_PIECES() {
  37     return [
  38       'a',
  39       'c',
  40       'j',
  41       'l',
  42       'm',
  43       'o',
  44       's',
  45       't',
  46       'u',
  47       'v'
  48     ];
  49   }
  50
  51   // Decode above notation into additional piece
  52   getExtraPiece(symbol) {
  53     if (['a','j','m','s','u'].includes(symbol))
  54       return 'n';
  55     return 'b';
  56   }
  57
  58   // If piece not in usual list, bishop or knight appears.
  59   getPotentialMovesFrom([x, y]) {
  60     let moves = super.getPotentialMovesFrom(sq);
  61     const color = this.turn;
  62
  63 // treat castle case here (both pieces appear!)
  64     if (
  65       V.AUGMENTED_PIECES.includes(this.board[x][y][1]) &&
  66       ((color == 'w' && x == 7) || (color == "b" && x == 0))
  67     ) {
  68       const newPiece = this.getExtraPiece(this.board[x][y][1]);
  69       moves.forEach(m => {
  70         m.appear.push(
  71           new PiPo({
  72             p: newPiece,
  73             c: color,
  74             x: x,
  75             y: y
  76           })
  77         );
  78       });
  79     }
  80     return moves;
  81   }
  82
  83   // TODO: special case of move 1 = choose squares, knight first, then bishop
  84   // (just click ?)
  85 };