Module: Natural20::Cover

Included in:
AttackAction, CommandlineUI, BattleMap, Firebolt, MagicMissile, SpellAttackHelper
Defined in:
lib/natural_20/utils/cover.rb

Instance Method Summary collapse

Instance Method Details

#cover_calculation(map, source, target, entity_1_pos: nil, entity_2_pos: nil, naturally_stealthy: false) ⇒ Integer

Parameters:

Returns:

  • (Integer) 


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# File 'lib/natural_20/utils/cover.rb', line 8

def cover_calculation(map, source, target, entity_1_pos: nil, entity_2_pos: nil, naturally_stealthy: false)
  source_squares = entity_1_pos ? map.entity_squares_at_pos(source, *entity_1_pos) : map.entity_squares(source)
  target_squares = entity_2_pos ? map.entity_squares_at_pos(target, *entity_2_pos) : map.entity_squares(target)
  source_position = map.position_of(source)
  source_melee_square = source.melee_squares(map, target_position: source_position, adjacent_only: true)

  source_squares.map do |source_pos|
    target_squares.map do |target_pos|
      cover_characteristics = map.line_of_sight?(*source_pos, *target_pos, nil, true, naturally_stealthy)
      next 0 unless cover_characteristics

      max_ac = 0

      # check if any objects in the area provide cover
      objs = map.objects_at(*target_pos)
      objs.each do |object|
        max_ac = [max_ac, object.cover_ac].max if object.can_hide?
      end

      cover_characteristics.each do |cover|
        cover_type, pos = cover

        next if cover_type == :none
        next if source_melee_square.include?(pos)

        max_ac = [max_ac, 2].max if cover_type == :half
        max_ac = [max_ac, 5].max if cover_type == :three_quarter

        return 1 if cover_type.is_a?(Integer) && naturally_stealthy && (cover_type - target.size_identifier) >= 1
      end
      max_ac
    end.min
  end.min || 0
end