std::vector<target> default_ai_context_impl::find_targets(const move_map& enemy_dstsrc)
{
log_scope2(log_ai, "finding targets...");
unit_map &units_ = resources::gameboard->units();
unit_map::iterator leader = units_.find_leader(get_side());
const gamemap &map_ = resources::gameboard->map();
std::vector<team> teams_ = resources::gameboard->teams();
const bool has_leader = leader != units_.end();
std::vector<target> targets;
//=== start getting targets
//if enemy units are in range of the leader, then we target the enemies who are in range.
if(has_leader) {
double threat = power_projection(leader->get_location(), enemy_dstsrc);
if(threat > 0.0) {
//find the location of enemy threats
std::set<map_location> threats;
map_location adj[6];
get_adjacent_tiles(leader->get_location(), adj);
for(size_t n = 0; n != 6; ++n) {
std::pair<move_map::const_iterator,move_map::const_iterator> itors = enemy_dstsrc.equal_range(adj[n]);
while(itors.first != itors.second) {
if(units_.count(itors.first->second)) {
threats.insert(itors.first->second);
}
++itors.first;
}
}
assert(threats.empty() == false);
const double value = threat/double(threats.size());
for(std::set<map_location>::const_iterator i = threats.begin(); i != threats.end(); ++i) {
LOG_AI << "found threat target... " << *i << " with value: " << value << "\n";
targets.push_back(target(*i,value,target::TYPE::THREAT));
}
}
}
double corner_distance = distance_between(map_location::ZERO(), map_location(map_.w(),map_.h()));
double village_value = get_village_value();
if(has_leader && village_value > 0.0) {
std::map<map_location,pathfind::paths> friends_possible_moves;
move_map friends_srcdst, friends_dstsrc;
calculate_possible_moves(friends_possible_moves, friends_srcdst, friends_dstsrc, false, true);
const std::vector<map_location>& villages = map_.villages();
for(std::vector<map_location>::const_iterator t =
villages.begin(); t != villages.end(); ++t) {
assert(map_.on_board(*t));
bool ally_village = false;
for (size_t i = 0; i != teams_.size(); ++i)
{
if (!current_team().is_enemy(i + 1) && teams_[i].owns_village(*t)) {
ally_village = true;
break;
}
}
if (ally_village)
{
//Support seems to cause the AI to just 'sit around' a lot, so
//only turn it on if it's explicitly enabled.
if(get_support_villages()) {
double enemy = power_projection(*t, enemy_dstsrc);
if (enemy > 0)
{
enemy *= 1.7;
double our = power_projection(*t, friends_dstsrc);
double value = village_value * our / enemy;
add_target(target(*t, value, target::TYPE::SUPPORT));
}
}
}
else
{
double leader_distance = distance_between(*t, leader->get_location());
double value = village_value * (1.0 - leader_distance / corner_distance);
LOG_AI << "found village target... " << *t
<< " with value: " << value
<< " distance: " << leader_distance << '\n';
targets.push_back(target(*t,value,target::TYPE::VILLAGE));
}
}
}
std::vector<goal_ptr>& goals = get_goals();
//find the enemy leaders and explicit targets
unit_map::const_iterator u;
if (get_leader_value()>0.0) {
for(u = units_.begin(); u != units_.end(); ++u) {
//is a visible enemy leader
if (u->can_recruit() && current_team().is_enemy(u->side())
&& !u->invisible(u->get_location(), *resources::gameboard)) {
assert(map_.on_board(u->get_location()));
LOG_AI << "found enemy leader (side: " << u->side() << ") target... " << u->get_location() << " with value: " << get_leader_value() << "\n";
targets.push_back(target(u->get_location(), get_leader_value(), target::TYPE::LEADER));
}
}
}
//explicit targets for this team
for(std::vector<goal_ptr>::iterator j = goals.begin();
j != goals.end(); ++j) {
if (!(*j)->active()) {
continue;
}
(*j)->add_targets(std::back_inserter(targets));
}
//=== end getting targets
std::vector<double> new_values;
for(std::vector<target>::iterator i = targets.begin();
i != targets.end(); ++i) {
new_values.push_back(i->value);
for(std::vector<target>::const_iterator j = targets.begin(); j != targets.end(); ++j) {
if(i->loc == j->loc) {
continue;
}
const double distance = std::abs(j->loc.x - i->loc.x) +
std::abs(j->loc.y - i->loc.y);
new_values.back() += j->value/(distance*distance);
}
}
assert(new_values.size() == targets.size());
for(size_t n = 0; n != new_values.size(); ++n) {
LOG_AI << "target value: " << targets[n].value << " -> " << new_values[n] << "\n";
targets[n].value = new_values[n];
}
return targets;
}
void aspect_attacks::do_attack_analysis(
const map_location& loc,
const move_map& srcdst, const move_map& dstsrc,
const move_map& fullmove_srcdst, const move_map& fullmove_dstsrc,
const move_map& enemy_srcdst, const move_map& enemy_dstsrc,
const map_location* tiles, bool* used_locations,
std::vector<map_location>& units,
std::vector<attack_analysis>& result,
attack_analysis& cur_analysis,
const team ¤t_team
) const
{
// This function is called fairly frequently, so interact with the user here.
ai::manager::raise_user_interact();
const int default_attack_depth = 5;
if(cur_analysis.movements.size() >= size_t(default_attack_depth)) {
//std::cerr << "ANALYSIS " << cur_analysis.movements.size() << " >= " << get_attack_depth() << "\n";
return;
}
gamemap &map_ = *resources::game_map;
unit_map &units_ = *resources::units;
std::vector<team> &teams_ = *resources::teams;
const size_t max_positions = 1000;
if(result.size() > max_positions && !cur_analysis.movements.empty()) {
LOG_AI << "cut analysis short with number of positions\n";
return;
}
for(size_t i = 0; i != units.size(); ++i) {
const map_location current_unit = units[i];
unit_map::iterator unit_itor = units_.find(current_unit);
assert(unit_itor != units_.end());
// See if the unit has the backstab ability.
// Units with backstab will want to try to have a
// friendly unit opposite the position they move to.
//
// See if the unit has the slow ability -- units with slow only attack first.
bool backstab = false, slow = false;
std::vector<attack_type>& attacks = unit_itor->attacks();
for(std::vector<attack_type>::iterator a = attacks.begin(); a != attacks.end(); ++a) {
a->set_specials_context(map_location(), map_location(), units_, true, NULL);
if(a->get_special_bool("backstab")) {
backstab = true;
}
if(a->get_special_bool("slow")) {
slow = true;
}
}
if(slow && cur_analysis.movements.empty() == false) {
continue;
}
// Check if the friendly unit is surrounded,
// A unit is surrounded if it is flanked by enemy units
// and at least one other enemy unit is nearby
// or if the unit is totaly surrounded by enemies
// with max. one tile to escape.
bool is_surrounded = false;
bool is_flanked = false;
int enemy_units_around = 0;
int accessible_tiles = 0;
map_location adj[6];
get_adjacent_tiles(current_unit, adj);
size_t tile;
for(tile = 0; tile != 3; ++tile) {
const unit_map::const_iterator tmp_unit = units_.find(adj[tile]);
bool possible_flanked = false;
if(map_.on_board(adj[tile]))
{
accessible_tiles++;
if (tmp_unit != units_.end() && current_team.is_enemy(tmp_unit->side()))
{
enemy_units_around++;
possible_flanked = true;
}
}
const unit_map::const_iterator tmp_opposite_unit = units_.find(adj[tile + 3]);
if(map_.on_board(adj[tile + 3]))
{
accessible_tiles++;
if (tmp_opposite_unit != units_.end() && current_team.is_enemy(tmp_opposite_unit->side()))
{
enemy_units_around++;
if(possible_flanked)
{
is_flanked = true;
}
}
}
}
if((is_flanked && enemy_units_around > 2) || enemy_units_around >= accessible_tiles - 1)
is_surrounded = true;
double best_vulnerability = 0.0, best_support = 0.0;
int best_rating = 0;
int cur_position = -1;
// Iterate over positions adjacent to the unit, finding the best rated one.
for(int j = 0; j != 6; ++j) {
// If in this planned attack, a unit is already in this location.
if(used_locations[j]) {
continue;
}
// See if the current unit can reach that position.
if (tiles[j] != current_unit) {
typedef std::multimap<map_location,map_location>::const_iterator Itor;
std::pair<Itor,Itor> its = dstsrc.equal_range(tiles[j]);
while(its.first != its.second) {
if(its.first->second == current_unit)
break;
++its.first;
}
// If the unit can't move to this location.
if(its.first == its.second || units_.find(tiles[j]) != units_.end()) {
continue;
}
}
unit_ability_list abil = unit_itor->get_abilities("leadership",tiles[j]);
int best_leadership_bonus = abil.highest("value").first;
double leadership_bonus = static_cast<double>(best_leadership_bonus+100)/100.0;
if (leadership_bonus > 1.1) {
LOG_AI << unit_itor->name() << " is getting leadership " << leadership_bonus << "\n";
}
// Check to see whether this move would be a backstab.
int backstab_bonus = 1;
double surround_bonus = 1.0;
if(tiles[(j+3)%6] != current_unit) {
const unit_map::const_iterator itor = units_.find(tiles[(j+3)%6]);
// Note that we *could* also check if a unit plans to move there
// before we're at this stage, but we don't because, since the
// attack calculations don't actually take backstab into account (too complicated),
// this could actually make our analysis look *worse* instead of better.
// So we only check for 'concrete' backstab opportunities.
// That would also break backstab_check, since it assumes
// the defender is in place.
if(itor != units_.end() &&
backstab_check(tiles[j], loc, units_, teams_)) {
if(backstab) {
backstab_bonus = 2;
}
// No surround bonus if target is skirmisher
if (!itor->get_ability_bool("skirmisher"))
surround_bonus = 1.2;
}
}
// See if this position is the best rated we've seen so far.
int rating = static_cast<int>(rate_terrain(*unit_itor, tiles[j]) * backstab_bonus * leadership_bonus);
if(cur_position >= 0 && rating < best_rating) {
continue;
}
// Find out how vulnerable we are to attack from enemy units in this hex.
//FIXME: suokko's r29531 multiplied this by a constant 1.5. ?
const double vulnerability = power_projection(tiles[j],enemy_dstsrc);//?
// Calculate how much support we have on this hex from allies.
const double support = power_projection(tiles[j], fullmove_dstsrc);//?
// If this is a position with equal defense to another position,
// but more vulnerability then we don't want to use it.
#ifdef SUOKKO
//FIXME: this code was in sukko's r29531 Correct?
// scale vulnerability to 60 hp unit
if(cur_position >= 0 && rating < best_rating
&& (vulnerability/surround_bonus*30.0)/unit_itor->second.hitpoints() -
(support*surround_bonus*30.0)/unit_itor->second.max_hitpoints()
> best_vulnerability - best_support) {
continue;
}
#else
if(cur_position >= 0 && rating == best_rating && vulnerability/surround_bonus - support*surround_bonus >= best_vulnerability - best_support) {
continue;
}
#endif
cur_position = j;
best_rating = rating;
#ifdef SUOKKO
//FIXME: this code was in sukko's r29531 Correct?
best_vulnerability = (vulnerability/surround_bonus*30.0)/unit_itor->second.hitpoints();
best_support = (support*surround_bonus*30.0)/unit_itor->second.max_hitpoints();
#else
best_vulnerability = vulnerability/surround_bonus;
best_support = support*surround_bonus;
#endif
}
if(cur_position != -1) {
units.erase(units.begin() + i);
cur_analysis.movements.push_back(std::pair<map_location,map_location>(current_unit,tiles[cur_position]));
cur_analysis.vulnerability += best_vulnerability;
cur_analysis.support += best_support;
cur_analysis.is_surrounded = is_surrounded;
cur_analysis.analyze(map_, units_, *this, dstsrc, srcdst, enemy_dstsrc, get_aggression());
result.push_back(cur_analysis);
used_locations[cur_position] = true;
do_attack_analysis(loc,srcdst,dstsrc,fullmove_srcdst,fullmove_dstsrc,enemy_srcdst,enemy_dstsrc,
tiles,used_locations,
units,result,cur_analysis, current_team);
used_locations[cur_position] = false;
cur_analysis.vulnerability -= best_vulnerability;
cur_analysis.support -= best_support;
cur_analysis.movements.pop_back();
units.insert(units.begin() + i, current_unit);
}
}
}
