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battle_calcs.attack_rating: bug fix for when AI side has no leader

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Check for AI side's leader's existence before trying to calculate
distance from leader.
This commit is contained in:
mattsc 2013-11-25 19:28:33 -08:00
parent a8171d07a0
commit ea915d36c2
1 changed files with 7 additions and 5 deletions
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12
data/ai/lua/battle_calcs.lua
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@ -859,11 +859,13 @@ function battle_calcs.attack_rating(attacker, defender, dst, cfg, cache)
-- Get a very small bonus for hexes in between defender and AI leader
-- 'relative_distances' is larger for attack hexes closer to the side leader (possible values: -1 .. 1)
local relative_distances =
H.distance_between(defender.x, defender.y, leader.x, leader.y)
- H.distance_between(dst[1], dst[2], leader.x, leader.y)
value_fraction = value_fraction + relative_distances * distance_leader_weight
--print(' relative_distances:', relative_distances, value_fraction)
if leader then
local relative_distances =
H.distance_between(defender.x, defender.y, leader.x, leader.y)
- H.distance_between(dst[1], dst[2], leader.x, leader.y)
value_fraction = value_fraction + relative_distances * distance_leader_weight
--print(' relative_distances:', relative_distances, value_fraction)
end
-- Add a very small penalty for attack hexes occupied by other units
-- Note: it must be checked previously that the unit on the hex can move away