client/src/variants/Rifle.js

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