public/javascripts/variants/Antiking.js

   1 class AntikingRules extends ChessRules
   2 {
   3     // Path to pieces
   4     static getPpath(b)
   5     {
   6         return b[1]=='a' ? "Antiking/"+b : b;
   7     }
   8
   9     static get ANTIKING() { return 'a'; }
  10
  11     initVariables(fen)
  12     {
  13         super.initVariables(fen);
  14         this.antikingPos = {'w':[-1,-1], 'b':[-1,-1]};
  15         const position = fen.split(" ")[0].split("/");
  16         for (let i=0; i<position.length; i++)
  17         {
  18             let k = 0;
  19             for (let j=0; j<position[i].length; j++)
  20             {
  21                 switch (position[i].charAt(j))
  22                 {
  23                     case 'a':
  24                         this.antikingPos['b'] = [i,k];
  25                         break;
  26                     case 'A':
  27                         this.antikingPos['w'] = [i,k];
  28                         break;
  29                     default:
  30                         let num = parseInt(position[i].charAt(j));
  31                         if (!isNaN(num))
  32                             k += (num-1);
  33                 }
  34                 k++;
  35             }
  36         }
  37     }
  38
  39     canTake([x1,y1], [x2,y2])
  40     {
  41         const piece1 = this.getPiece(x1,y1);
  42         const piece2 = this.getPiece(x2,y2);
  43         const color1 = this.getColor(x1,y1);
  44         const color2 = this.getColor(x2,y2);
  45         return !["a","A"].includes(piece2) &&
  46             ((piece1 != "a" && color1 != color2) || (piece1 == "a" && color1 == color2));
  47     }
  48
  49     getPotentialMovesFrom([x,y])
  50     {
  51         switch (this.getPiece(x,y))
  52         {
  53             case VariantRules.ANTIKING:
  54                 return this.getPotentialAntikingMoves([x,y]);
  55             default:
  56                 return super.getPotentialMovesFrom([x,y]);
  57         }
  58     }
  59
  60     getPotentialAntikingMoves(sq)
  61     {
  62         return this.getSlideNJumpMoves(sq, VariantRules.steps[VariantRules.QUEEN], "oneStep");
  63     }
  64
  65     isAttacked(sq, colors)
  66     {
  67         return (super.isAttacked(sq, colors) || this.isAttackedByAntiking(sq, colors));
  68     }
  69
  70     isAttackedByKing([x,y], colors)
  71     {
  72         if (this.getPiece(x,y) == VariantRules.ANTIKING)
  73             return false; //antiking is not attacked by king
  74         return this.isAttackedBySlideNJump([x,y], colors,
  75             VariantRules.KING, VariantRules.steps[VariantRules.QUEEN], "oneStep");
  76     }
  77
  78     isAttackedByAntiking([x,y], colors)
  79     {
  80         if (this.getPiece(x,y) == VariantRules.KING)
  81             return false; //king is not attacked by antiking
  82         return this.isAttackedBySlideNJump([x,y], colors,
  83             VariantRules.ANTIKING, VariantRules.steps[VariantRules.QUEEN], "oneStep");
  84     }
  85
  86     underCheck(move)
  87     {
  88         const c = this.turn;
  89         const oppCol = this.getOppCol(c);
  90         this.play(move)
  91         let res = this.isAttacked(this.kingPos[c], oppCol)
  92             || !this.isAttacked(this.antikingPos[c], oppCol);
  93         this.undo(move);
  94         return res;
  95     }
  96
  97     getCheckSquares(move)
  98     {
  99         let res = super.getCheckSquares(move);
 100         this.play(move);
 101         const c = this.turn;
 102         if (!this.isAttacked(this.antikingPos[c], this.getOppCol(c)))
 103             res.push(JSON.parse(JSON.stringify(this.antikingPos[c])));
 104         this.undo(move);
 105         return res;
 106     }
 107
 108     updateVariables(move)
 109     {
 110         super.updateVariables(move);
 111         const piece = this.getPiece(move.start.x,move.start.y);
 112         const c = this.getColor(move.start.x,move.start.y);
 113         // Update antiking position
 114         if (piece == VariantRules.ANTIKING)
 115         {
 116             this.antikingPos[c][0] = move.appear[0].x;
 117             this.antikingPos[c][1] = move.appear[0].y;
 118         }
 119     }
 120
 121     unupdateVariables(move)
 122     {
 123         super.unupdateVariables(move);
 124         const c = this.getColor(move.start.x,move.start.y);
 125         if (this.getPiece(move.start.x,move.start.y) == VariantRules.ANTIKING)
 126             this.antikingPos[c] = [move.start.x, move.start.y];
 127     }
 128
 129     checkGameEnd()
 130     {
 131         const color = this.turn;
 132         const oppCol = this.getOppCol(color);
 133         if (!this.isAttacked(this.kingPos[color], oppCol)
 134             && this.isAttacked(this.antikingPos[color], oppCol))
 135         {
 136             return "1/2";
 137         }
 138         return color == "w" ? "0-1" : "1-0";
 139     }
 140
 141     // Pieces values (TODO: use Object.assign() + ChessRules.VALUES ?)
 142     static get VALUES() {
 143         return {
 144             'p': 1,
 145             'r': 5,
 146             'n': 3,
 147             'b': 3,
 148             'q': 9,
 149             'k': 1000,
 150             'a': 1000
 151         };
 152     }
 153
 154     static GenRandInitFen()
 155     {
 156         let randFen = ChessRules.GenRandInitFen();
 157         // Black side
 158         let antikingPos = _.random(7);
 159         let ranks23 = "pppppppp/" + (antikingPos>0?antikingPos:"") + "A" + (antikingPos<7?7-antikingPos:"");
 160         randFen = randFen.replace("pppppppp/8", ranks23);
 161         // White side
 162         antikingPos = _.random(7);
 163         ranks23 = (antikingPos>0?antikingPos:"") + "a" + (antikingPos<7?7-antikingPos:"") + "/PPPPPPPP";
 164         randFen = randFen.replace("8/PPPPPPPP", ranks23);
 165         return randFen;
 166     }
 167 }