part of 'generator.dart';

class Requirement {
  final int vx, vy;
  final DirectionSet smooth;

  Requirement(this.vx, this.vy, this.smooth);

  Requirement flip() {
    return Requirement(vx, vy, smooth.flip());
  }

  Requirement rotateLeft() {
    return Requirement(vy, vx, smooth.rotateLeft());
  }

  Requirement rotateRight() {
    return Requirement(vy, vx, smooth.rotateRight());
  }

  Requirement unReorient(int r) {
    assert(r >= 0 && r < 8);
    Requirement o = this;
    if (r % 2 == 1) {
      o = o.flip();
      r -= 1;
    }
    while (r >= 2) {
      o = o.rotateLeft();
      r -= 2;
    }
    return o;
  }
}