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mobil2.cc
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mobil2.cc
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#include "drake/automotive/mobil_planner2.h"
#include <algorithm>
#include <cmath>
#include <limits>
#include <utility>
#include <vector>
#include <fstream> ////////////////////// added ////////////////////////////////
// spec
#include <unistd.h>
#include "drake/automotive/maliput/api/junction.h"
#include "drake/automotive/maliput/api/segment.h"
#include "drake/common/cond.h"
#include "drake/common/drake_assert.h"
#include "drake/common/symbolic_formula.h"
#include "drake/math/saturate.h"
namespace drake {
using maliput::api::GeoPosition;
using maliput::api::Lane;
using maliput::api::LanePosition;
using maliput::api::RoadGeometry;
using maliput::api::RoadPosition;
using math::saturate;
using automotive::pose_selector::RoadOdometry;
using systems::BasicVector;
using systems::rendering::FrameVelocity;
using systems::rendering::PoseBundle;
using systems::rendering::PoseVector;
namespace automotive {
namespace {
static constexpr int kIdmParamsIndex{0};
static constexpr int kMobilParamsIndex{1};
static constexpr double kDefaultLargeAccel{1e6}; // m/s^2
} // namespace
// flags to help plan overtake on single lane
bool overtake_to_left = false;
bool overtake_to_right = false;
bool overtake = false;
const Lane* old_ego_lane = nullptr;
int car_id = -1;
template <typename T>
MobilPlanner2<T>::MobilPlanner2(const RoadGeometry& road, bool initial_with_s)
: road_(road),
with_s_(initial_with_s),
ego_pose_index_{
this->DeclareVectorInputPort(PoseVector<T>()).get_index()},
ego_velocity_index_{
this->DeclareVectorInputPort(FrameVelocity<T>()).get_index()},
ego_acceleration_index_{
this->DeclareVectorInputPort(BasicVector<T>(1)).get_index()},
traffic_index_{this->DeclareAbstractInputPort().get_index()},
lane_index_{this->DeclareAbstractOutputPort(
systems::Value<LaneDirection>(LaneDirection()))
.get_index()} {
// Validate the provided RoadGeometry.
DRAKE_DEMAND(road_.num_junctions() > 0);
DRAKE_DEMAND(road_.junction(0)->num_segments() > 0);
DRAKE_DEMAND(road_.junction(0)->segment(0)->num_lanes() > 0);
this->DeclareNumericParameter(IdmPlannerParameters<T>());
this->DeclareNumericParameter(MobilPlannerParameters<T>());
}
template <typename T>
const systems::InputPortDescriptor<T>& MobilPlanner2<T>::ego_pose_input() const {
return systems::System<T>::get_input_port(ego_pose_index_);
}
template <typename T>
const systems::InputPortDescriptor<T>& MobilPlanner2<T>::ego_velocity_input()
const {
return systems::System<T>::get_input_port(ego_velocity_index_);
}
template <typename T>
const systems::InputPortDescriptor<T>& MobilPlanner2<T>::ego_acceleration_input()
const {
return systems::System<T>::get_input_port(ego_acceleration_index_);
}
template <typename T>
const systems::InputPortDescriptor<T>& MobilPlanner2<T>::traffic_input() const {
return systems::System<T>::get_input_port(traffic_index_);
}
template <typename T>
const systems::OutputPortDescriptor<T>& MobilPlanner2<T>::lane_output() const {
return systems::System<T>::get_output_port(lane_index_);
}
template <typename T>
void MobilPlanner2<T>::DoCalcOutput(const systems::Context<T>& context,
systems::SystemOutput<T>* output) const {
// Obtain the parameters.
const IdmPlannerParameters<T>& idm_params =
this->template GetNumericParameter<IdmPlannerParameters>(context,
kIdmParamsIndex);
const MobilPlannerParameters<T>& mobil_params =
this->template GetNumericParameter<MobilPlannerParameters>(
context, kMobilParamsIndex);
// Obtain the input/output data structures.
const PoseVector<T>* const ego_pose =
this->template EvalVectorInput<PoseVector>(context, ego_pose_index_);
DRAKE_ASSERT(ego_pose != nullptr);
const FrameVelocity<T>* const ego_velocity =
this->template EvalVectorInput<FrameVelocity>(context,
ego_velocity_index_);
DRAKE_ASSERT(ego_velocity != nullptr);
const BasicVector<T>* const ego_accel_command =
this->template EvalVectorInput<BasicVector>(context,
ego_acceleration_index_);
DRAKE_ASSERT(ego_accel_command != nullptr);
const PoseBundle<T>* const traffic_poses =
this->template EvalInputValue<PoseBundle<T>>(context, traffic_index_);
DRAKE_ASSERT(traffic_poses != nullptr);
LaneDirection* lane_direction =
&output->GetMutableData(lane_index_)
->template GetMutableValue<LaneDirection>();
DRAKE_ASSERT(lane_direction != nullptr);
ImplDoCalcLane(*ego_pose, *ego_velocity, *traffic_poses, *ego_accel_command,
idm_params, mobil_params, lane_direction);
}
void reset_overtake_flags()
{
overtake_to_right = false;
overtake_to_left = false;
overtake = false;
old_ego_lane = nullptr;
car_id = -1;
}
template <typename T>
bool MobilPlanner2<T>::overtake_condition(const PoseVector<T>& ego_pose,
const FrameVelocity<T>& ego_velocity,
const PoseBundle<T>& traffic_poses, const BasicVector<T>& ego_accel_command,
const IdmPlannerParameters<T>& idm_params,
const MobilPlannerParameters<T>& mobil_params,
LaneDirection* lane_direction, const RoadGeometry& road_n) const
{
const RoadPosition traffic_position =
pose_selector::CalcRoadPosition(road_n, traffic_poses.get_pose(car_id));
const double& s_traffic = traffic_position.pos.s(); // other car s coor
const RoadPosition& ego_position =
pose_selector::CalcRoadPosition(road_n, ego_pose.get_isometry());
const double& s_ego = ego_position.pos.s(); // ego car position s-coor
if(s_ego > s_traffic) return true;
return false;
}
template <typename T>
void MobilPlanner2<T>::ImplDoCalcLane(
const PoseVector<T>& ego_pose, const FrameVelocity<T>& ego_velocity,
const PoseBundle<T>& traffic_poses, const BasicVector<T>& ego_accel_command,
const IdmPlannerParameters<T>& idm_params,
const MobilPlannerParameters<T>& mobil_params,
LaneDirection* lane_direction) const {
DRAKE_DEMAND(idm_params.IsValid());
DRAKE_DEMAND(mobil_params.IsValid());
const RoadPosition& ego_position =
pose_selector::CalcRoadPosition(road_, ego_pose.get_isometry());
// Prepare a list of (possibly nullptr) Lanes to evaluate.
std::pair<const Lane*, const Lane*> lanes = std::make_pair(
ego_position.lane->to_left(), ego_position.lane->to_right());
const Lane* lane = ego_position.lane;
if (lanes.first != nullptr || lanes.second != nullptr) {
const std::pair<T, T> incentives =
ComputeIncentives(lanes, idm_params, mobil_params, ego_pose,
ego_velocity, traffic_poses, ego_accel_command[0]);
// Switch to the lane with the highest incentive score greater than zero,
// staying in the same lane if under the threshold.
// TODO: testing nature of execution path related to this function/////////
// std::ofstream myfile;
// myfile.open ("~/Desktop/drake-distro/drake/automotive/z.txt");
// myfile << "Writing this to a file.\n";
// myfile.close();
///////////////////////////////////////////////////////////////////////////
// if an old lane has been assigned, then ego has switched it's initial
// lane and is done with half the overtake procedure
// It then only needs to go back to it's initial lane
if(old_ego_lane != nullptr)
{
if(ego_position.lane->id().id != old_ego_lane->id().id) //done switching
if(overtake_to_right == true || overtake_to_left == true)
overtake = true;
}
// Find the car directly ahead of the ego car
// value checks ensure this computation is done only once
// Runtime of find procedure is O(number of cars)
if((overtake_to_left == true || overtake_to_right == true) && car_id == -1)
{
const double& s_ego = ego_position.pos.s(); // ego car position s-coor
//double min = 10000; // arbitrary large value
// finding car ahead (this work is done only once per overtake sequence)
for (int i = 0; i < traffic_poses.get_num_poses(); ++i)
{
const RoadPosition traffic_position =
pose_selector::CalcRoadPosition(road_, traffic_poses.get_pose(i));
if (traffic_position.lane->id().id != ego_position.lane->id().id)
continue; // since the lane can't have the car we're looking for
const double& s_traffic = traffic_position.pos.s(); // other car
//const double s_diff = s_traffic - s_ego;
// if(s_diff > 0 && s_diff < min)
// {
// car_id = i;
// min = s_diff;
// }
if( (traffic_position.lane->id().id == ego_position.lane->id().id) &&
(s_ego != s_traffic) )
car_id = i;
}
// // after for-loop, car_id has the car directly ahead of the ego
}
// decision making
const T threshold = mobil_params.threshold();
if(overtake == false)
{
if(incentives.first >= incentives.second)
{
if (incentives.first > threshold) // true indicates lane change
{
lane = lanes.first;
overtake_to_right = true; // went left; so to overtake, go right
old_ego_lane = ego_position.lane; // save the old lane info
}
else
lane = ego_position.lane;
}
else
{
if (incentives.second > threshold) // true indicates lane change
{
lane = lanes.second;
overtake_to_left = true; // went right; so to overtake, go left
old_ego_lane = ego_position.lane; // save the old lane info
}
else
lane = ego_position.lane;
}
}
else // overtake flag is set, so let ego switch lane and then get ahead
{
if(car_id != -1)
{
if(overtake_to_right == true)
{
if(overtake_condition(ego_pose, ego_velocity, traffic_poses,
ego_accel_command, idm_params, mobil_params,
lane_direction, road_)
== true) //go right when you can
{
lane = lanes.second;
if(old_ego_lane->id().id == ego_position.lane->id().id)
reset_overtake_flags(); // done overtaking
}
else // otherwise, stay in your current lane till you overtake
lane = ego_position.lane;
}
else //if(overtake_to_left == true)
{
if(overtake_condition(ego_pose, ego_velocity, traffic_poses,
ego_accel_command, idm_params, mobil_params,
lane_direction, road_)
== true) //go left when you can
{
lane = lanes.first;
if(old_ego_lane->id().id == ego_position.lane->id().id)
reset_overtake_flags(); // done overtaking
}
else // otherwise, stay in your current lane till you overtake
lane = ego_position.lane;
}
} // if
} // else outer
} // end lane null ptr check
*lane_direction = LaneDirection(lane, with_s_);
// N.B. Assumes neighboring lanes are all confluent (i.e. with_s points in the
// same direction).
}
template <typename T>
const std::pair<T, T> MobilPlanner2<T>::ComputeIncentives(
const std::pair<const Lane*, const Lane*> lanes,
const IdmPlannerParameters<T>& idm_params,
const MobilPlannerParameters<T>& mobil_params,
const PoseVector<T>& ego_pose, const FrameVelocity<T>& ego_velocity,
const PoseBundle<T>& traffic_poses, const T& ego_acceleration) const {
// Initially disincentivize both neighboring lane options. N.B. The first and
// second elements correspond to the left and right lanes, respectively.
std::pair<T, T> incentives(-kDefaultLargeAccel, -kDefaultLargeAccel);
const RoadPosition& ego_position =
pose_selector::CalcRoadPosition(road_, ego_pose.get_isometry());
DRAKE_DEMAND(ego_position.lane != nullptr);
RoadOdometry<T> leading_odometry{};
RoadOdometry<T> trailing_odometry{};
std::tie(leading_odometry, trailing_odometry) =
pose_selector::FindClosestPair(road_, ego_pose, traffic_poses);
// Current acceleration of the ego car.
const RoadOdometry<T>& ego_odometry =
RoadOdometry<T>(ego_position, ego_velocity);
// Current acceleration of the trailing car.
const T trailing_this_old_accel =
EvaluateIdm(idm_params, trailing_odometry, ego_odometry);
// New acceleration of the trailing car if the ego were to change lanes.
const T trailing_this_new_accel =
EvaluateIdm(idm_params, trailing_odometry, leading_odometry);
// Acceleration delta of the trailing car in the ego car's current lane.
const T trailing_delta_accel_this =
trailing_this_new_accel - trailing_this_old_accel;
// Compute the incentive for the left lane.
if (lanes.first != nullptr) {
const OdometryPair& odometries = pose_selector::FindClosestPair(
road_, ego_pose, traffic_poses, lanes.first);
ComputeIncentiveOutOfLane(idm_params, mobil_params, odometries,
ego_odometry, ego_acceleration,
trailing_delta_accel_this, &incentives.first);
}
// Compute the incentive for the right lane.
if (lanes.second != nullptr) {
const OdometryPair& odometries = pose_selector::FindClosestPair(
road_, ego_pose, traffic_poses, lanes.second);
ComputeIncentiveOutOfLane(idm_params, mobil_params, odometries,
ego_odometry, ego_acceleration,
trailing_delta_accel_this, &incentives.second);
}
return incentives;
}
template <typename T>
void MobilPlanner2<T>::ComputeIncentiveOutOfLane(
const IdmPlannerParameters<T>& idm_params,
const MobilPlannerParameters<T>& mobil_params,
const OdometryPair& odometries, const RoadOdometry<T>& ego_odometry,
const T& ego_old_accel, const T& trailing_delta_accel_this,
T* incentive) const {
RoadOdometry<T> leading_odometry{};
RoadOdometry<T> trailing_odometry{};
std::tie(leading_odometry, trailing_odometry) = odometries;
// Acceleration of the ego car if it were to move to the neighboring lane.
const T ego_new_accel =
EvaluateIdm(idm_params, ego_odometry, leading_odometry);
// Original acceleration of the trailing car in the neighboring lane.
const T trailing_old_accel =
EvaluateIdm(idm_params, trailing_odometry, leading_odometry);
// Acceleration of the trailing car in the neighboring lane if the ego moves
// here.
const T trailing_new_accel =
EvaluateIdm(idm_params, trailing_odometry, ego_odometry);
// Acceleration delta of the trailing car in the neighboring (other) lane.
const T trailing_delta_accel_other = trailing_new_accel - trailing_old_accel;
const T ego_delta_accel = ego_new_accel - ego_old_accel;
// Do not switch to this lane if it discomforts the trailing car too much.
if (trailing_new_accel < -mobil_params.max_deceleration()) return;
// Compute the incentive as a weighted sum of the net accelerations for
// the ego and each immediate neighbor.
*incentive = ego_delta_accel +
mobil_params.p() *
(trailing_delta_accel_other + trailing_delta_accel_this);
}
template <typename T>
const T MobilPlanner2<T>::EvaluateIdm(
const IdmPlannerParameters<T>& idm_params,
const RoadOdometry<T>& ego_odometry,
const RoadOdometry<T>& lead_car_odometry) const {
const T& s_ego = ego_odometry.pos.s();
const T& s_dot_ego = pose_selector::GetSVelocity(ego_odometry);
const T& s_lead = lead_car_odometry.pos.s();
const T& s_dot_lead = pose_selector::GetSVelocity(lead_car_odometry);
const T delta = s_lead - s_ego;
// Saturate the net_distance at distance_lower_bound away from the ego car to
// prevent the IDM equation from producing near-singular solutions.
// TODO(jadecastro): Move this to IdmPlanner::Evaluate().
const T net_distance =
cond(delta >= T(0.), std::max(delta - idm_params.bloat_diameter(),
idm_params.distance_lower_limit()),
std::min(delta + idm_params.bloat_diameter(),
-idm_params.distance_lower_limit()));
DRAKE_DEMAND(std::abs(net_distance) >= idm_params.distance_lower_limit());
const T closing_velocity = s_dot_ego - s_dot_lead;
return IdmPlanner<T>::Evaluate(idm_params, s_dot_ego, net_distance,
closing_velocity);
}
// These instantiations must match the API documentation in mobil_planner.h.
template class MobilPlanner2<double>;
} // namespace automotive
} // namespace drake