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#include "locality_finder.hpp"
#include "../indexer/ftypes_matcher.hpp"
#include "../indexer/features_vector.hpp"
#include "../geometry/distance_on_sphere.hpp"
namespace search
{
double const MAX_RADIUS_CITY = 30000.0;
class DoLoader
{
public:
DoLoader(LocalityFinder const & finder, FeaturesVector const & loader, LocalityFinder::Cache & cache)
: m_finder(finder), m_loader(loader), m_cache(cache)
{
}
void operator() (uint32_t id) const
{
FeatureType ft;
m_loader.Get(id, ft);
if (ft.GetFeatureType() != feature::GEOM_POINT)
return;
using namespace ftypes;
switch (IsLocalityChecker::Instance().GetType(ft))
{
case CITY:
case TOWN:
break;
default: // cache only cities and towns at this moment
return;
}
if (m_cache.m_loaded.count(id) > 0)
return; // already loaded
uint32_t const population = ftypes::GetPopulation(ft);
if (population == 0)
return;
double const radius = ftypes::GetRadiusByPopulation(population);
m2::RectD const rect = MercatorBounds::RectByCenterXYAndSizeInMeters(ft.GetCenter(), radius);
if (!rect.IsIntersect(m_cache.m_rect))
return;
// read item
string name;
if (!ft.GetName(m_finder.m_lang, name))
if (!ft.GetName(0, name))
return;
LocalityItem item(rect, population, id, name);
m_cache.m_tree.Add(item, item.GetLimitRect());
m_cache.m_loaded.insert(id);
}
private:
LocalityFinder const & m_finder;
FeaturesVector const & m_loader;
LocalityFinder::Cache & m_cache;
};
class DoSelectLocality
{
public:
DoSelectLocality(string & name, m2::PointD const & p)
: m_name(name) , m_point(p), m_bestValue(numeric_limits<double>::max())
{
}
void operator() (LocalityItem const & item)
{
m2::PointD const c = item.m_rect.Center();
double const d = ms::DistanceOnEarth(MercatorBounds::YToLat(c.y),
MercatorBounds::XToLon(c.x),
MercatorBounds::YToLat(m_point.y),
MercatorBounds::XToLon(m_point.x));
double const value = ftypes::GetPopulationByRadius(d) / static_cast<double>(item.m_population);
if (value < m_bestValue)
{
m_bestValue = value;
m_name = item.m_name;
}
}
private:
string & m_name;
m2::PointD m_point;
double m_bestValue;
};
LocalityItem::LocalityItem(m2::RectD const & rect, uint32_t population, ID id, string const & name)
: m_rect(rect), m_name(name), m_population(population), m_id(id)
{
}
LocalityFinder::LocalityFinder(Index const * pIndex)
: m_pIndex(pIndex), m_lang(0)
{
}
void LocalityFinder::CorrectMinimalRect(m2::RectD & rect) const
{
m2::RectD const rlt = MercatorBounds::RectByCenterXYAndSizeInMeters(rect.LeftTop(), MAX_RADIUS_CITY);
m2::RectD const rrb = MercatorBounds::RectByCenterXYAndSizeInMeters(rect.RightBottom(), MAX_RADIUS_CITY);
rect = m2::RectD(MercatorBounds::ClampX(rlt.minX()),
MercatorBounds::ClampY(rrb.minY()),
MercatorBounds::ClampX(rrb.maxX()),
MercatorBounds::ClampY(rlt.maxY()));
}
void LocalityFinder::RecreateCache(Cache & cache, m2::RectD rect) const
{
vector<MwmInfo> mwmInfo;
m_pIndex->GetMwmInfo(mwmInfo);
cache.Clear();
CorrectMinimalRect(rect);
covering::CoveringGetter cov(rect, covering::ViewportWithLowLevels);
for (MwmSet::MwmId mwmId = 0; mwmId < mwmInfo.size(); ++mwmId)
{
typedef feature::DataHeader HeaderT;
Index::MwmLock mwmLock(*m_pIndex, mwmId);
MwmValue * pMwm = mwmLock.GetValue();
if (pMwm && pMwm->GetHeader().GetType() == HeaderT::world)
{
HeaderT const & header = pMwm->GetHeader();
int const scale = header.GetLastScale(); // scales::GetUpperWorldScale()
covering::IntervalsT const & interval = cov.Get(scale);
ScaleIndex<ModelReaderPtr> index(pMwm->m_cont.GetReader(INDEX_FILE_TAG), pMwm->m_factory);
FeaturesVector loader(pMwm->m_cont, header);
cache.m_rect = rect;
for (size_t i = 0; i < interval.size(); ++i)
{
DoLoader doLoader(*this, loader, cache);
index.ForEachInIntervalAndScale(doLoader, interval[i].first, interval[i].second, scale);
}
}
}
}
void LocalityFinder::SetViewportByIndex(m2::RectD const & rect, size_t idx)
{
ASSERT_LESS(idx, (size_t)MAX_VIEWPORT_COUNT, ());
RecreateCache(m_cache[idx], rect);
}
void LocalityFinder::GetLocalityInViewport(const m2::PointD & pt, string & name) const
{
for (size_t i = 0; i < MAX_VIEWPORT_COUNT; ++i)
m_cache[i].GetLocality(pt, name);
}
void LocalityFinder::GetLocalityCreateCache(const m2::PointD & pt, string & name) const
{
// search in temporary caches and find most unused cache
size_t minUsageIdx = 0;
size_t minUsage = numeric_limits<size_t>::max();
for (size_t idx = 0; idx < MAX_CACHE_TMP_COUNT; ++idx)
{
Cache const & cache = m_cache_tmp[idx];
cache.GetLocality(pt, name);
if (!name.empty())
return;
if (cache.m_usage < minUsage)
{
minUsage = cache.m_usage;
minUsageIdx = idx;
}
}
Cache & cache = m_cache_tmp[minUsageIdx];
RecreateCache(cache, MercatorBounds::RectByCenterXYAndSizeInMeters(pt, MAX_RADIUS_CITY));
cache.GetLocality(pt, name);
}
void LocalityFinder::ClearCacheAll()
{
for (size_t i = 0; i < MAX_VIEWPORT_COUNT; ++i)
ClearCache(i);
for (size_t i = 0; i < MAX_CACHE_TMP_COUNT; ++i)
m_cache_tmp[i].Clear();
}
void LocalityFinder::ClearCache(size_t idx)
{
ASSERT_LESS(idx, (size_t)MAX_VIEWPORT_COUNT, ());
m_cache[idx].Clear();
}
void LocalityFinder::Cache::Clear()
{
m_usage = 0;
m_tree.Clear();
m_loaded.clear();
}
void LocalityFinder::Cache::GetLocality(m2::PointD const & pt, string & name) const
{
if (!m_rect.IsPointInside(pt))
return;
++m_usage;
m_tree.ForEachInRect(m2::RectD(pt, pt), DoSelectLocality(name, pt));
}
}
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