client/src/variants/Atomic_OLD.js

   1 import { ChessRules } from "@/base_rules";
   2 export const VariantRules = class AtomicRules extends ChessRules
   3 {
   4     getPotentialMovesFrom([x,y])
   5     {
   6         let moves = super.getPotentialMovesFrom([x,y]);
   7
   8         // Handle explosions
   9         moves.forEach(m => {
  10             if (m.vanish.length > 1 && m.appear.length <= 1) //avoid castles
  11             {
  12                 // Explosion! TODO(?): drop moves which explode our king here
  13                 let steps = [ [-1,-1],[-1,0],[-1,1],[0,-1],[0,1],[1,-1],[1,0],[1,1] ];
  14                 for (let step of steps)
  15                 {
  16                     let x = m.end.x + step[0];
  17                     let y = m.end.y + step[1];
  18                     if (V.OnBoard(x,y) && this.board[x][y] != V.EMPTY
  19                         && this.getPiece(x,y) != V.PAWN)
  20                     {
  21                         m.vanish.push(
  22                             new PiPo({p:this.getPiece(x,y),c:this.getColor(x,y),x:x,y:y}));
  23                     }
  24                 }
  25                 m.end = {x:m.appear[0].x, y:m.appear[0].y};
  26                 m.appear.pop(); //Nothin appears in this case
  27             }
  28         });
  29
  30         return moves;
  31     }
  32
  33     getPotentialKingMoves([x,y])
  34     {
  35         // King cannot capture:
  36         let moves = [];
  37         const steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
  38         for (let step of steps)
  39         {
  40             const i = x + step[0];
  41             const j = y + step[1];
  42             if (V.OnBoard(i,j) && this.board[i][j] == V.EMPTY)
  43                 moves.push(this.getBasicMove([x,y], [i,j]));
  44         }
  45         return moves.concat(this.getCastleMoves([x,y]));
  46     }
  47
  48     isAttacked(sq, colors)
  49     {
  50         if (this.getPiece(sq[0],sq[1]) == V.KING && this.isAttackedByKing(sq, colors))
  51             return false; //king cannot take...
  52         return (this.isAttackedByPawn(sq, colors)
  53             || this.isAttackedByRook(sq, colors)
  54             || this.isAttackedByKnight(sq, colors)
  55             || this.isAttackedByBishop(sq, colors)
  56             || this.isAttackedByQueen(sq, colors));
  57     }
  58
  59     updateVariables(move)
  60     {
  61         super.updateVariables(move);
  62         const color = move.vanish[0].c;
  63         if (move.appear.length == 0) //capture
  64         {
  65             const firstRank = {"w": 7, "b": 0};
  66             for (let c of ["w","b"])
  67             {
  68                 // Did we explode king of color c ? (TODO: remove move earlier)
  69                 if (Math.abs(this.kingPos[c][0]-move.end.x) <= 1
  70                     && Math.abs(this.kingPos[c][1]-move.end.y) <= 1)
  71                 {
  72                     this.kingPos[c] = [-1,-1];
  73                     this.castleFlags[c] = [false,false];
  74                 }
  75                 else
  76                 {
  77                     // Now check if init rook(s) exploded
  78                     if (Math.abs(move.end.x-firstRank[c]) <= 1)
  79                     {
  80                         if (Math.abs(move.end.y-this.INIT_COL_ROOK[c][0]) <= 1)
  81                             this.castleFlags[c][0] = false;
  82                         if (Math.abs(move.end.y-this.INIT_COL_ROOK[c][1]) <= 1)
  83                             this.castleFlags[c][1] = false;
  84                     }
  85                 }
  86             }
  87         }
  88     }
  89
  90     unupdateVariables(move)
  91     {
  92         super.unupdateVariables(move);
  93         const c = move.vanish[0].c;
  94         const oppCol = V.GetOppCol(c);
  95         if ([this.kingPos[c][0],this.kingPos[oppCol][0]].some(e => { return e < 0; }))
  96         {
  97             // There is a chance that last move blowed some king away..
  98             for (let psq of move.vanish)
  99             {
 100                 if (psq.p == 'k')
 101                     this.kingPos[psq.c==c ? c : oppCol] = [psq.x, psq.y];
 102             }
 103         }
 104     }
 105
 106     underCheck(color)
 107     {
 108         const oppCol = V.GetOppCol(color);
 109         let res = undefined;
 110         // If our king disappeared, move is not valid
 111         if (this.kingPos[color][0] < 0)
 112             res = true;
 113         // If opponent king disappeared, move is valid
 114         else if (this.kingPos[oppCol][0] < 0)
 115             res = false;
 116         // Otherwise, if we remain under check, move is not valid
 117         else
 118             res = this.isAttacked(this.kingPos[color], [oppCol]);
 119         return res;
 120     }
 121
 122     getCheckSquares(color)
 123     {
 124         let res = [ ];
 125         if (this.kingPos[color][0] >= 0 //king might have exploded
 126             && this.isAttacked(this.kingPos[color], [V.GetOppCol(color)]))
 127         {
 128             res = [ JSON.parse(JSON.stringify(this.kingPos[color])) ]
 129         }
 130         return res;
 131     }
 132
 133     checkGameEnd()
 134     {
 135         const color = this.turn;
 136         const kp = this.kingPos[color];
 137         if (kp[0] < 0) //king disappeared
 138             return color == "w" ? "0-1" : "1-0";
 139         if (!this.isAttacked(kp, [V.GetOppCol(color)]))
 140             return "1/2";
 141         return color == "w" ? "0-1" : "1-0"; //checkmate
 142     }
 143 }