def blocked_passage?
    # Retorna falso se o jogador e o alvo estiverem nas
    #mesmas coordenadas x e y, pois, nesta versão do Ruby,
    #o atan2 retorna um erro
    return false if pos?(@target.x, @target.y)
    radians = Math.atan2(@target.x - @x, @target.y - @y)
    speed_x = Math.sin(radians)
    speed_y = Math.cos(radians)
    range_x = (@target.x - @x).abs
    range_y = (@target.y - @y).abs
    direction = projectile_direction
    result = false
    x = @x
    y = @y
    while true
      # Soma valores decimais
      x += speed_x
      y += speed_y
      x2 = x.to_i
      y2 = y.to_i
      if distance_x_from(x2).abs > range_x || distance_y_from(y2).abs > range_y
        break
      elsif !$game_map.valid?(x2, y2) || !map_passable?(x2, y2, direction)
        result = true
        break
      end
    end
    result
  end

  def projectile_direction
    sx = distance_x_from(@target.x)
    sy = distance_y_from(@target.y)
    if sx.abs > sy.abs
      direction = sx > 0 ? 4 : 6
    elsif sy != 0
      direction = sy > 0 ? 8 : 2
    end
    direction
  end