variants/Antiking2/class.js

   1 import ChessRules from "/base_rules.js";
   2 import AbstractAntikingRules from "/variants/_Antiking/class.js";
   3 import {Random} from "/utils/alea.js";
   4
   5 export default class Antiking2Rules extends AbstractAntikingRules {
   6
   7   static get Options() {
   8     return {
   9       select: C.Options.select,
  10       styles: A.Options.styles.concat("cylinder")
  11     };
  12   }
  13
  14   genRandInitFen(seed) {
  15     const baseFen = super.genRandInitFen(seed);
  16     // Just add an antiking on 3rd ranks
  17     let akPos = [3, 3];
  18     if (this.options.randomness >= 1) {
  19       akPos[0] = Random.randInt(this.size.y);
  20       if (this.options.randomness == 2)
  21         akPos[1] = Random.randInt(this.size.y);
  22       else
  23         akPos[1] = akPos[0];
  24     }
  25     const antikingLine = (color) => {
  26       const [idx, symbol] = (color == 'w' ? [0, 'a'] : [1, 'A']);
  27       return (
  28         (akPos[idx] > 0 ? akPos[idx] : "") + symbol +
  29         (akPos[idx] < this.size.y - 1
  30           ? C.FenEmptySquares(this.size.y - 1 - akPos[idx])
  31           : "")
  32       );
  33     };
  34     return (
  35       baseFen.replace("p/8", "p/" + antikingLine('b'))
  36              .replace("8/P", antikingLine('w') + "/P")
  37     );
  38   }
  39
  40 };