Class: JustXiangqi::Ma

Inherits:
Piece
  • Object
show all
Defined in:
lib/just_xiangqi/pieces/ma.rb

Overview

Ma

The piece that can move in an l shape, but can be blocked by adjacent pieces.

Constant Summary collapse

MOVEMENT_MAP = 
{
  [0,-1] => [[-1,-2], [1,-2]],
  [1,0] => [[2,-1], [2,1]],
  [0,1] => [[-1,2], [1,2]],
  [-1,0] => [[-2,-1], [-2,1]]
}

Instance Method Summary collapse

Methods inherited from Piece

#initialize

Constructor Details

This class inherits a constructor from JustXiangqi::Piece

Instance Method Details

#destinations(square, game_state) ⇒ SquareSet

All the squares that the piece can move to and/or capture.

Parameters:

  • square (Square) —

    the origin square.

  • game_state (GameState) —

    the current game state.

Returns:



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# File 'lib/just_xiangqi/pieces/ma.rb', line 23

def destinations(square, game_state)
  _squares = MOVEMENT_MAP.map do |adjacent_map, destinations_map|
    adjacent = find_square_by_displacement(square, game_state, adjacent_map)
    
    if adjacent.nil? || adjacent.occupied?
      nil
    else
      find_valid_destinations(square, game_state, destinations_map)
    end
  end.flatten.compact

  SquareSet.new(squares: _squares)
end