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#include "routing/edge_estimator.hpp"
#include "traffic/traffic_info.hpp"
#include "base/assert.hpp"
#include <algorithm>
#include <unordered_map>
using namespace routing;
using namespace std;
using namespace traffic;
namespace
{
double constexpr kKMPH2MPS = 1000.0 / (60 * 60);
double TimeBetweenSec(m2::PointD const & from, m2::PointD const & to, double speedMPS)
{
CHECK_GREATER(speedMPS, 0.0,
("from:", MercatorBounds::ToLatLon(from), "to:", MercatorBounds::ToLatLon(to)));
double const distanceM = MercatorBounds::DistanceOnEarth(from, to);
return distanceM / speedMPS;
}
double CalcTrafficFactor(SpeedGroup speedGroup)
{
double constexpr kImpossibleDrivingFactor = 1e4;
if (speedGroup == SpeedGroup::TempBlock)
return kImpossibleDrivingFactor;
double const percentage =
0.01 * static_cast<double>(kSpeedGroupThresholdPercentage[static_cast<size_t>(speedGroup)]);
CHECK_GREATER(percentage, 0.0, ("Speed group:", speedGroup));
return 1.0 / percentage;
}
double GetPedestrianClimbPenalty(double tangent)
{
if (tangent < 0)
return 1.0 + 2.0 * (-tangent);
return 1.0 + 5.0 * tangent;
}
double GetBicycleClimbPenalty(double tangent)
{
if (tangent <= 0)
return 1.0;
return 1.0 + 10.0 * tangent;
}
double GetCarClimbPenalty(double /* tangent */) { return 1.0; }
template <typename GetClimbPenalty>
double CalcClimbSegmentWeight(Segment const & segment, RoadGeometry const & road,
GetClimbPenalty && getClimbPenalty)
{
Junction const & from = road.GetJunction(segment.GetPointId(false /* front */));
Junction const & to = road.GetJunction(segment.GetPointId(true /* front */));
double const distance = MercatorBounds::DistanceOnEarth(from.GetPoint(), to.GetPoint());
double const speedMPS = road.GetSpeed() * kKMPH2MPS;
CHECK_GREATER(speedMPS, 0.0, ());
double const timeSec = distance / speedMPS;
if (my::AlmostEqualAbs(distance, 0.0, 0.1))
return timeSec;
double const altitudeDiff =
static_cast<double>(to.GetAltitude()) - static_cast<double>(from.GetAltitude());
return timeSec * getClimbPenalty(altitudeDiff / distance);
}
} // namespace
namespace routing
{
// EdgeEstimator -----------------------------------------------------------------------------------
EdgeEstimator::EdgeEstimator(double maxSpeedKMpH, double offroadSpeedKMpH)
: m_maxSpeedMPS(maxSpeedKMpH * kKMPH2MPS), m_offroadSpeedMPS(offroadSpeedKMpH * kKMPH2MPS)
{
CHECK_GREATER(m_offroadSpeedMPS, 0.0, ());
CHECK_GREATER_OR_EQUAL(m_maxSpeedMPS, m_offroadSpeedMPS, ());
}
double EdgeEstimator::CalcHeuristic(m2::PointD const & from, m2::PointD const & to) const
{
return TimeBetweenSec(from, to, m_maxSpeedMPS);
}
double EdgeEstimator::CalcLeapWeight(m2::PointD const & from, m2::PointD const & to) const
{
// Let us assume for the time being that
// leap edges will be added with a half of max speed.
// @TODO(bykoianko) It's necessary to gather statistics to calculate better factor(s) instead of
// one below.
return TimeBetweenSec(from, to, m_maxSpeedMPS / 2.0);
}
double EdgeEstimator::CalcOffroadWeight(m2::PointD const & from, m2::PointD const & to) const
{
return TimeBetweenSec(from, to, m_offroadSpeedMPS);
}
// PedestrianEstimator -----------------------------------------------------------------------------
class PedestrianEstimator final : public EdgeEstimator
{
public:
PedestrianEstimator(double maxSpeedKMpH, double offroadSpeedKMpH)
: EdgeEstimator(maxSpeedKMpH, offroadSpeedKMpH)
{
}
// EdgeEstimator overrides:
double GetUTurnPenalty() const override { return 0.0 /* seconds */; }
bool LeapIsAllowed(NumMwmId /* mwmId */) const override { return false; }
double CalcSegmentWeight(Segment const & segment, RoadGeometry const & road) const override
{
return CalcClimbSegmentWeight(segment, road, GetPedestrianClimbPenalty);
}
};
// BicycleEstimator --------------------------------------------------------------------------------
class BicycleEstimator final : public EdgeEstimator
{
public:
BicycleEstimator(double maxSpeedKMpH, double offroadSpeedKMpH)
: EdgeEstimator(maxSpeedKMpH, offroadSpeedKMpH)
{
}
// EdgeEstimator overrides:
double GetUTurnPenalty() const override { return 20.0 /* seconds */; }
bool LeapIsAllowed(NumMwmId /* mwmId */) const override { return false; }
double CalcSegmentWeight(Segment const & segment, RoadGeometry const & road) const override
{
return CalcClimbSegmentWeight(segment, road, GetBicycleClimbPenalty);
}
};
// CarEstimator ------------------------------------------------------------------------------------
class CarEstimator final : public EdgeEstimator
{
public:
CarEstimator(shared_ptr<TrafficStash> trafficStash, double maxSpeedKMpH, double offroadSpeedKMpH);
// EdgeEstimator overrides:
double CalcSegmentWeight(Segment const & segment, RoadGeometry const & road) const override;
double GetUTurnPenalty() const override;
bool LeapIsAllowed(NumMwmId mwmId) const override;
private:
shared_ptr<TrafficStash> m_trafficStash;
};
CarEstimator::CarEstimator(shared_ptr<TrafficStash> trafficStash, double maxSpeedKMpH,
double offroadSpeedKMpH)
: EdgeEstimator(maxSpeedKMpH, offroadSpeedKMpH), m_trafficStash(move(trafficStash))
{
}
double CarEstimator::CalcSegmentWeight(Segment const & segment, RoadGeometry const & road) const
{
// Current time estimation are too optimistic.
// Need more accurate tuning: traffic lights, traffic jams, road models and so on.
// Add some penalty to make estimation of a more realistic.
// TODO: make accurate tuning, remove penalty.
double constexpr kTimePenalty = 1.8;
double result = CalcClimbSegmentWeight(segment, road, GetCarClimbPenalty);
if (m_trafficStash)
{
SpeedGroup const speedGroup = m_trafficStash->GetSpeedGroup(segment);
ASSERT_LESS(speedGroup, SpeedGroup::Count, ());
double const trafficFactor = CalcTrafficFactor(speedGroup);
result *= trafficFactor;
if (speedGroup != SpeedGroup::Unknown && speedGroup != SpeedGroup::G5)
result *= kTimePenalty;
}
return result;
}
double CarEstimator::GetUTurnPenalty() const
{
// Adds 2 minutes penalty for U-turn. The value is quite arbitrary
// and needs to be properly selected after a number of real-world
// experiments.
return 2 * 60; // seconds
}
bool CarEstimator::LeapIsAllowed(NumMwmId mwmId) const { return !m_trafficStash->Has(mwmId); }
// EdgeEstimator -----------------------------------------------------------------------------------
// static
shared_ptr<EdgeEstimator> EdgeEstimator::Create(VehicleType vehicleType, double maxSpeedKMpH,
double offroadSpeedKMpH,
shared_ptr<TrafficStash> trafficStash)
{
switch (vehicleType)
{
case VehicleType::Pedestrian:
case VehicleType::Transit:
return make_shared<PedestrianEstimator>(maxSpeedKMpH, offroadSpeedKMpH);
case VehicleType::Bicycle: return make_shared<BicycleEstimator>(maxSpeedKMpH, offroadSpeedKMpH);
case VehicleType::Car:
return make_shared<CarEstimator>(trafficStash, maxSpeedKMpH, offroadSpeedKMpH);
case VehicleType::Count:
CHECK(false, ("Can't create EdgeEstimator for", vehicleType));
return nullptr;
}
}
// static
shared_ptr<EdgeEstimator> EdgeEstimator::Create(VehicleType vehicleType,
VehicleModelInterface const & vehicleModel,
shared_ptr<TrafficStash> trafficStash)
{
return Create(vehicleType, vehicleModel.GetMaxSpeed(), vehicleModel.GetOffroadSpeed(),
trafficStash);
}
} // namespace routing
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