map_location pathfind::find_vacant_tile(const gamemap& map,
const unit_map& units,
const map_location& loc,
pathfind::VACANT_TILE_TYPE vacancy,
const unit* pass_check)
{
if (!map.on_board(loc)) return map_location();
std::set<map_location> pending_tiles_to_check, tiles_checked;
pending_tiles_to_check.insert(loc);
// Iterate out 50 hexes from loc
for (int distance = 0; distance < 50; ++distance) {
if (pending_tiles_to_check.empty())
return map_location();
//Copy over the hexes to check and clear the old set
std::set<map_location> tiles_checking;
tiles_checking.swap(pending_tiles_to_check);
//Iterate over all the hexes we need to check
foreach (const map_location &loc, tiles_checking)
{
//If this area is not a castle but should, skip it.
if (vacancy == pathfind::VACANT_CASTLE && !map.is_castle(loc)) continue;
const bool pass_check_and_unreachable = pass_check
&& pass_check->movement_cost(map[loc]) == unit_movement_type::UNREACHABLE;
//If the unit can't reach the tile and we have searched
//an area of at least radius 10 (arbitrary), skip the tile.
//Neccessary for cases such as an unreachable
//starting hex surrounded by 6 other unreachable hexes, in which case
//the algorithm would not even search distance==1
//even if there's a reachable hex for distance==2.
if (pass_check_and_unreachable && distance > 10) continue;
//If the hex is empty and we do either no pass check or the hex is reachable, return it.
if (units.find(loc) == units.end() && !pass_check_and_unreachable) return loc;
map_location adjs[6];
get_adjacent_tiles(loc,adjs);
foreach (const map_location &loc, adjs)
{
if (!map.on_board(loc)) continue;
// Add the tile to be checked if it hasn't already been and
// isn't being checked.
if (tiles_checked.find(loc) == tiles_checked.end() &&
tiles_checking.find(loc) == tiles_checking.end())
{
pending_tiles_to_check.insert(loc);
}
}
}
tiles_checked.swap(tiles_checking);
}
return map_location();
}
map_location find_vacant_tile(const gamemap& map,
const unit_map& units,
const map_location& loc,
VACANT_TILE_TYPE vacancy,
const unit* pass_check)
{
std::set<map_location> pending_tiles_to_check;
std::set<map_location> tiles_checked;
pending_tiles_to_check.insert( loc );
// Iterate out 50 hexes from loc
for (int distance = 0; distance < 50; ++distance) {
if (pending_tiles_to_check.empty())
return map_location();
//Copy over the hexes to check and clear the old set
std::set<map_location> tiles_checking = pending_tiles_to_check;
std::set<map_location>::const_iterator tc_itor = tiles_checking.begin();
pending_tiles_to_check.clear();
//Iterate over all the hexes we need to check
for ( ; tc_itor != tiles_checking.end(); ++tc_itor )
{
//If the unit cannot reach this area or it's not a castle but should, skip it.
if ((vacancy == VACANT_CASTLE && !map.is_castle(*tc_itor))
|| (pass_check && pass_check->movement_cost(map[*tc_itor])
== unit_movement_type::UNREACHABLE))
continue;
//If the hex is empty, return it.
if (map.on_board(*tc_itor) && units.find(*tc_itor) == units.end())
return (*tc_itor);
map_location adjs[6];
get_adjacent_tiles(*tc_itor,adjs);
for (int i = 0; i != 6; ++i)
{
//Add the tile to be checked if it hasn't already been and isn't already
//pending to be checked
if (pending_tiles_to_check.find(adjs[i]) == pending_tiles_to_check.end() &&
tiles_checked.find(adjs[i]) == tiles_checked.end() &&
tiles_checking.find(adjs[i]) == tiles_checking.end())
{
pending_tiles_to_check.insert(adjs[i]);
}
}
}
tiles_checked = tiles_checking;
}
return map_location();
}
map_location pathfind::find_vacant_tile(const gamemap& map,
const unit_map& units,
const map_location& loc,
pathfind::VACANT_TILE_TYPE vacancy,
const unit* pass_check)
{
if (!map.on_board(loc)) return map_location();
std::set<map_location> pending_tiles_to_check, tiles_checked;
pending_tiles_to_check.insert(loc);
// Iterate out 50 hexes from loc
for (int distance = 0; distance < 50; ++distance) {
if (pending_tiles_to_check.empty())
return map_location();
//Copy over the hexes to check and clear the old set
std::set<map_location> tiles_checking;
tiles_checking.swap(pending_tiles_to_check);
//Iterate over all the hexes we need to check
foreach (const map_location &loc, tiles_checking)
{
//If the unit cannot reach this area or it's not a castle but should, skip it.
if ((vacancy == pathfind::VACANT_CASTLE && !map.is_castle(loc))
|| (pass_check && pass_check->movement_cost(map[loc])
== unit_movement_type::UNREACHABLE))
continue;
//If the hex is empty, return it.
if (units.find(loc) == units.end())
return loc;
map_location adjs[6];
get_adjacent_tiles(loc,adjs);
foreach (const map_location &loc, adjs)
{
if (!map.on_board(loc)) continue;
// Add the tile to be checked if it hasn't already been and
// isn't being checked.
if (tiles_checked.find(loc) == tiles_checked.end() &&
tiles_checking.find(loc) == tiles_checking.end())
{
pending_tiles_to_check.insert(loc);
}
}
}
tiles_checked.swap(tiles_checking);
}
return map_location();
}
