client/src/variants/Rifle.js

   1 import { ChessRules, PiPo, Move } from "@/base_rules";
   2
   3 export class RifleRules extends ChessRules {
   4   getEpSquare(moveOrSquare) {
   5     if (typeof moveOrSquare !== "object" || moveOrSquare.appear.length > 0)
   6       return super.getEpSquare(moveOrSquare);
   7     // Capturing move: no en-passant
   8     return undefined;
   9   }
  10
  11   getBasicMove([sx, sy], [ex, ey], tr) {
  12     let mv = new Move({
  13       appear: [],
  14       vanish: [],
  15       start: {x:sx, y:sy},
  16       end: {x:ex, y:ey}
  17     });
  18     if (this.board[ex][ey] != V.EMPTY) {
  19       // No movement: just vanishing enemy piece
  20       mv.vanish = [
  21         new PiPo({
  22           x: ex,
  23           y: ey,
  24           c: this.getColor(ex, ey),
  25           p: this.getPiece(ex, ey)
  26         })
  27       ];
  28     }
  29     else {
  30       // Normal move
  31       mv.appear = [
  32         new PiPo({
  33           x: ex,
  34           y: ey,
  35           c: tr ? tr.c : this.getColor(sx, sy),
  36           p: tr ? tr.p : this.getPiece(sx, sy)
  37         })
  38       ];
  39       mv.vanish = [
  40         new PiPo({
  41           x: sx,
  42           y: sy,
  43           c: this.getColor(sx, sy),
  44           p: this.getPiece(sx, sy)
  45         })
  46       ];
  47     }
  48
  49     return mv;
  50   }
  51
  52   getEnpassantCaptures([x, y], shiftX) {
  53     let moves = [];
  54     const Lep = this.epSquares.length;
  55     const epSquare = this.epSquares[Lep - 1]; //always at least one element
  56     if (
  57       !!epSquare &&
  58       epSquare.x == x + shiftX &&
  59       Math.abs(epSquare.y - y) == 1
  60     ) {
  61       let enpassantMove = new Move({
  62         appear: [],
  63         vanish: [],
  64         start: {x:x, y:y},
  65         end: {x:x+shiftX, y:epSquare.y}
  66       });
  67       enpassantMove.vanish.push({
  68         x: x,
  69         y: epSquare.y,
  70         p: "p",
  71         c: this.getColor(x, epSquare.y)
  72       });
  73       moves.push(enpassantMove);
  74     }
  75     return moves;
  76   }
  77
  78   static get SEARCH_DEPTH() {
  79     return 2;
  80   }
  81 };