client/src/variants/Minixiangqi.js

   1 import { ChessRules, PiPo, Move } from "@/base_rules";
   2 import { XiangqiRules } from "@/variants/Xiangqi"
   3
   4 export class MinixiangqiRules extends XiangqiRules {
   5
   6   static get Lines() {
   7     let lines = [];
   8     // Draw all inter-squares lines, shifted:
   9     for (let i = 0; i < V.size.x; i++)
  10       lines.push([[i+0.5, 0.5], [i+0.5, V.size.y-0.5]]);
  11     for (let j = 0; j < V.size.y; j++)
  12       lines.push([[0.5, j+0.5], [V.size.x-0.5, j+0.5]]);
  13     // Add palaces:
  14     lines.push([[0.5, 2.5], [2.5, 4.5]]);
  15     lines.push([[0.5, 4.5], [2.5, 2.5]]);
  16     lines.push([[4.5, 2.5], [6.5, 4.5]]);
  17     lines.push([[4.5, 4.5], [6.5, 2.5]]);
  18     return lines;
  19   }
  20
  21   // No elephants or advisors
  22   static get PIECES() {
  23     return [V.PAWN, V.ROOK, V.KNIGHT, V.KING, V.CANNON];
  24   }
  25
  26   getPpath(b) {
  27     return "Xiangqi/" + b;
  28   }
  29
  30   static get size() {
  31     return { x: 7, y: 7};
  32   }
  33
  34   getPotentialPawnMoves([x, y]) {
  35     const c = this.getColor(x, y);
  36     const shiftX = (c == 'w' ? -1 : 1);
  37     const lastRank = (c == 'w' && x == 0 || c == 'b' && x == 6);
  38     let steps = [];
  39     if (!lastRank) steps.push([shiftX, 0]);
  40     if (y > 0) steps.push([0, -1]);
  41     if (y < 9) steps.push([0, 1]);
  42     return super.getSlideNJumpMoves([x, y], steps, "oneStep");
  43   }
  44
  45   insidePalace(x, y, c) {
  46     return (
  47       (y >= 2 && y <= 4) &&
  48       (
  49         (c == 'w' && x >= 4) ||
  50         (c == 'b' && x <= 2)
  51       )
  52     );
  53   }
  54
  55   static get VALUES() {
  56     return {
  57       p: 2,
  58       r: 9,
  59       n: 4,
  60       c: 4.5,
  61       k: 1000
  62     };
  63   }
  64
  65   // Back to ChessRules method:
  66   evalPosition() {
  67     let evaluation = 0;
  68     for (let i = 0; i < V.size.x; i++) {
  69       for (let j = 0; j < V.size.y; j++) {
  70         if (this.board[i][j] != V.EMPTY)
  71           evaluation += (c == 'w' ? 1 : -1) * V.VALUES[this.getPiece(i, j)];
  72       }
  73     }
  74     return evaluation;
  75   }
  76
  77   // Also no randomization here
  78   static GenRandInitFen() {
  79     return "rcnkncr/p1ppp1p/7/7/7/P1PPP1P/RCNKNCR w 0";
  80   }
  81
  82 };