9b6008be54
The CA was supposed to mark hexes next to healers as potential healing locations, but because of this bug that did not work.
205 lines
8 KiB
Lua
205 lines
8 KiB
Lua
--[=[
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Functions to support the retreat of injured units
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]=]
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local H = wesnoth.require "helper"
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local AH = wesnoth.require "ai/lua/ai_helper.lua"
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local BC = wesnoth.require "ai/lua/battle_calcs.lua"
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local LS = wesnoth.require "location_set"
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local retreat_functions = {}
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function retreat_functions.min_hp(unit)
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-- The minimum hp to retreat is a function of level and terrain defense
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-- We want to stay longer on good terrain and leave early on very bad terrain
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local hp_per_level = wesnoth.unit_defense(unit, wesnoth.get_terrain(unit.x, unit.y))/15
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local level = unit.level
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-- Leaders are considered to be higher level because of their value
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if unit.canrecruit then level = level+2 end
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local min_hp = hp_per_level*(level+2)
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-- Account for poison damage on next turn
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if unit.status.poisoned then min_hp = min_hp + 8 end
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-- Make sure that units are actually injured
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if min_hp > unit.max_hitpoints - 4 then
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min_hp = unit.max_hitpoints - 4
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end
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return min_hp
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end
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-- Given a set of units, return one from the set that should retreat and the location to retreat to
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-- Return nil if no unit needs to retreat
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function retreat_functions.retreat_injured_units(units)
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-- Split units into those that regenerate and those that do not
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local regen, non_regen = {}, {}
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for i,u in ipairs(units) do
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if u.hitpoints < retreat_functions.min_hp(u) then
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if wesnoth.unit_ability(u, 'regenerate') then
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table.insert(regen, u)
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else
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table.insert(non_regen, u)
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end
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end
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end
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-- First we retreat non-regenerating units to healing terrain, if they can get to a safe location
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local unit_nr, loc_nr, threat_nr
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if non_regen[1] then
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unit_nr, loc_nr, threat_nr = retreat_functions.get_retreat_injured_units(non_regen, false)
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if unit_nr and (threat_nr == 0) then
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return unit_nr, loc_nr, threat_nr
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end
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end
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-- Then we retreat regenerating units to terrain with high defense, if they can get to a safe location
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local unit_r, loc_r, threat_r
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if regen[1] then
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unit_r, loc_r, threat_r = retreat_functions.get_retreat_injured_units(regen, true)
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if unit_r and (threat_r == 0) then
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return unit_r, loc_r, threat_r
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end
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end
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-- The we retreat those that cannot get to a safe location (non-regenerating units first again)
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if unit_nr then
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return unit_nr, loc_nr, threat_nr
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end
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if unit_r then
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return unit_r, loc_r, threat_r
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end
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end
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function retreat_functions.get_healing_locations()
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local possible_healers = AH.get_live_units {
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{ "filter_side", {{"allied_with", {side = wesnoth.current.side} }} }
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}
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local healing_locs = LS.create()
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for i,u in ipairs(possible_healers) do
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-- Only consider healers that cannot move this turn
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if u.moves == 0 or u.side ~= wesnoth.current.side then
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local heal_amount = 0
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local cure = 0
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local abilities = wml.get_child(u.__cfg, "abilities") or {}
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for ability in wml.child_range(abilities, "heals") do
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heal_amount = ability.value or 0
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if ability.poison == "slowed" then
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cure = 1
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elseif ability.poison == "cured" then
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cure = 2
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end
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end
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if heal_amount + cure > 0 then
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for x, y in H.adjacent_tiles(u.x, u.y) do
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local old_values = healing_locs:get(x, y) or {0, 0}
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local best_heal = math.max(old_values[0] or heal_amount)
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local best_cure = math.max(old_values[1] or cure)
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healing_locs:insert(x, y, {best_heal, best_cure})
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end
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end
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end
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end
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return healing_locs
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end
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function retreat_functions.get_retreat_injured_units(healees, regenerates)
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-- Only retreat to safe locations
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local enemies = AH.get_attackable_enemies()
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local enemy_attack_map = BC.get_attack_map(enemies)
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local healing_locs = retreat_functions.get_healing_locations()
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local max_rating, best_loc, best_unit = -9e99, nil, nil
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for i,u in ipairs(healees) do
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local possible_locations = wesnoth.find_reach(u)
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-- TODO: avoid ally's villages (may be preferable to lower rating so they will
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-- be used if unit is very injured)
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if not regenerates then
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-- Unit cannot self heal, make the terrain do it for us if possible
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local location_subset = {}
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for j,loc in ipairs(possible_locations) do
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local heal_amount = wesnoth.get_terrain_info(wesnoth.get_terrain(loc[1], loc[2])).healing or 0
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if heal_amount == true then
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-- handle deprecated syntax
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-- TODO: remove this when removed from game
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heal_amount = 8
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end
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local curing = 0
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if heal_amount > 0 then
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curing = 2
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end
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local healer_values = healing_locs:get(loc[1], loc[2]) or {0, 0}
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heal_amount = math.max(heal_amount, healer_values[1])
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curing = math.max(curing, healer_values[2])
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table.insert(location_subset, {loc[1], loc[2], heal_amount, curing})
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end
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possible_locations = location_subset
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end
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local base_rating = - u.hitpoints + u.max_hitpoints / 2.
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if u.status.poisoned then base_rating = base_rating + 8 end
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if u.status.slowed then base_rating = base_rating + 4 end
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base_rating = base_rating * 1000
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for j,loc in ipairs(possible_locations) do
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local unit_in_way = wesnoth.get_unit(loc[1], loc[2])
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if (not AH.is_visible_unit(wesnoth.current.side, unit_in_way))
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or ((unit_in_way.moves > 0) and (unit_in_way.side == wesnoth.current.side))
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then
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local rating = base_rating
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local heal_score = 0
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if regenerates then
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heal_score = math.min(8, u.max_hitpoints - u.hitpoints)
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else
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if u.status.poisoned then
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if loc[4] > 0 then
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heal_score = math.min(8, u.hitpoints - 1)
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if loc[4] == 2 then
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-- This value is arbitrary, it just represents the ability to heal on the turn after
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heal_score = heal_score + 1
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end
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end
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else
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heal_score = math.min(loc[3], u.max_hitpoints - u.hitpoints)
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end
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end
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-- Huge penalty for each enemy that can reach location,
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-- this is the single most important point (and non-linear)
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local enemy_count = enemy_attack_map.units:get(loc[1], loc[2]) or 0
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rating = rating - enemy_count * 100000
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-- Penalty based on terrain defense for unit
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rating = rating - wesnoth.unit_defense(u, wesnoth.get_terrain(loc[1], loc[2]))/10
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if (loc[1] == u.x) and (loc[2] == u.y) and (not u.status.poisoned) then
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if enemy_count == 0 then
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-- Bonus if we can rest heal
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-- TODO: Always apply bonus if unit has healthy trait
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heal_score = heal_score + 2
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end
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elseif unit_in_way then
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-- Penalty if a unit has to move out of the way
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-- (based on hp of moving unit)
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rating = rating + unit_in_way.hitpoints - unit_in_way.max_hitpoints
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end
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rating = rating + heal_score^2
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if (rating > max_rating) then
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max_rating, best_loc, best_unit = rating, loc, u
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end
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end
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end
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end
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return best_unit, best_loc, enemy_attack_map.units:get(best_loc[1], best_loc[2]) or 0
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end
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return retreat_functions
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