Method findAtTile

library/modules/Buildings.cpp:368–413

}

df::building *Buildings::findAtTile(df::coord pos)
{
    auto occ = Maps::getTileOccupancy(pos);
    if (!occ || !occ->bits.building)
        return NULL;

    // Try cache lookup in case it works:
    auto cached = locationToBuilding.find(pos);
    if (cached != locationToBuilding.end())
    {
        auto building = df::building::find(cached->second);

        if (building && building->z == pos.z &&
            building->isSettingOccupancy() &&
            containsTile(building, pos))
        {
            return building;
        }
    }

    // The authentic method, i.e. how the game generally does this:
    auto &vec = df::building::get_vector();
    for (size_t i = 0; i < vec.size(); i++)
    {
        auto bld = vec[i];

        if (pos.z != bld->z ||
            pos.x < bld->x1 || pos.x > bld->x2 ||
            pos.y < bld->y1 || pos.y > bld->y2)
            continue;

        if (!bld->isSettingOccupancy())
            continue;

        if (bld->room.extents && bld->isExtentShaped())
        {
            auto etile = getExtentTile(bld->room, pos);
            if (!etile || !*etile)
                continue;
        }

        return bld;
    }

    return NULL;
}

static unordered_map<int32_t, df::coord> corner1;
static unordered_map<int32_t, df::coord> corner2;