CGraphSlamEngine_impl.h

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2019, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */

#pragma once

#include <mrpt/config/CConfigFile.h>
#include <mrpt/io/CFileInputStream.h>
#include <mrpt/maps/CSimplePointsMap.h>
#include <mrpt/obs/CObservationOdometry.h>
#include <mrpt/opengl/CAxis.h>
#include <mrpt/opengl/CPlanarLaserScan.h>
#include <mrpt/system/filesystem.h>

namespace mrpt::graphslam
{
template <class GRAPH_T>
const std::string CGraphSlamEngine<GRAPH_T>::header_sep = std::string(80, '-');
template <class GRAPH_T>
const std::string CGraphSlamEngine<GRAPH_T>::report_sep = std::string(2, '\n');

template <class GRAPH_T>
CGraphSlamEngine<GRAPH_T>::CGraphSlamEngine(
    const std::string& config_file, const std::string& rawlog_fname,
    const std::string& fname_GT, mrpt::graphslam::CWindowManager* win_manager,
    mrpt::graphslam::deciders::CNodeRegistrationDecider<GRAPH_T>* node_reg,
    mrpt::graphslam::deciders::CEdgeRegistrationDecider<GRAPH_T>* edge_reg,
    mrpt::graphslam::optimizers::CGraphSlamOptimizer<GRAPH_T>* optimizer)
    : m_node_reg(node_reg),
      m_edge_reg(edge_reg),
      m_optimizer(optimizer),
      m_enable_visuals(win_manager != nullptr),
      m_config_fname(config_file),
      m_rawlog_fname(rawlog_fname),
      m_fname_GT(fname_GT),
      m_GT_poses_step(1),
      m_win_manager(win_manager),
      m_paused_message("Program is paused. Press \"p/P\" to resume."),
      m_text_index_paused_message(345),  // just a large number.
      m_odometry_color(0, 0, 255),
      m_GT_color(0, 255, 0),
      m_estimated_traj_color(255, 165, 0),
      m_optimized_map_color(255, 0, 0),
      m_current_constraint_type_color(255, 255, 255),
      m_robot_model_size(1),
      m_class_name("CGraphSlamEngine"),
      m_is_first_time_node_reg(true)
{
    this->initClass();
}

template <class GRAPH_T>
CGraphSlamEngine<GRAPH_T>::~CGraphSlamEngine()
{
    // change back the CImage path
    if (mrpt::system::strCmpI(m_GT_file_format, "rgbd_tum"))
    {
        MRPT_LOG_DEBUG_STREAM("Changing back the CImage PATH");
        mrpt::img::CImage::setImagesPathBase(m_img_prev_path_base);
    }
}

template <class GRAPH_T>
typename GRAPH_T::global_pose_t
    CGraphSlamEngine<GRAPH_T>::getCurrentRobotPosEstimation() const
{
    std::lock_guard<std::mutex> graph_lock(m_graph_section);
    return m_node_reg->getCurrentRobotPosEstimation();
}

template <class GRAPH_T>
typename GRAPH_T::global_poses_t
    CGraphSlamEngine<GRAPH_T>::getRobotEstimatedTrajectory() const
{
    std::lock_guard<std::mutex> graph_lock(m_graph_section);
    return m_graph.nodes;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::getNodeIDsOfEstimatedTrajectory(
    std::set<mrpt::graphs::TNodeID>* nodes_set) const
{
    ASSERTDEB_(nodes_set);
    m_graph.getAllNodes(*nodes_set);
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::initClass()
{
    MRPT_START;
    using namespace mrpt;
    using namespace mrpt::opengl;
    using namespace std;

    // logger instance properties
    m_time_logger.setName(m_class_name);
    this->logging_enable_keep_record = true;
    this->setLoggerName(m_class_name);

    // Assert that the deciders/optimizer pointers are valid
    ASSERTDEB_(m_node_reg);
    ASSERTDEB_(m_edge_reg);
    ASSERTDEB_(m_optimizer);

    // Assert that the graph class used is supported.
    {
        MRPT_LOG_INFO_STREAM("Verifying support for given MRPT graph class...");

        // TODO - initialize vector in a smarter way.
        m_supported_constraint_types.push_back("CPosePDFGaussianInf");
        m_supported_constraint_types.push_back("CPose3DPDFGaussianInf");

        constraint_t c;
        const string c_str(c.GetRuntimeClass()->className);

        bool found =
            (std::find(
                 m_supported_constraint_types.begin(),
                 m_supported_constraint_types.end(),
                 c_str) != m_supported_constraint_types.end());

        if (found)
        {
            MRPT_LOG_INFO_STREAM("[OK] Class: " << c_str);
        }
        else
        {
            MRPT_LOG_WARN_STREAM(
                "Given graph class " << c_str
                                     << " has not been tested consistently yet."
                                     << "Proceed at your own risk.");
            mrpt::system::pause();
        }

        // store it in a string for future use.
        m_current_constraint_type = c_str;
        m_current_constraint_type = "Constraints: " + m_current_constraint_type;
    }

    // If a valid CWindowManager pointer is given then visuals are on.
    if (m_enable_visuals)
    {
        m_win = m_win_manager->win;
        m_win_observer = m_win_manager->observer;
    }
    else
    {
        m_win = nullptr;
        m_win_observer = nullptr;

        MRPT_LOG_WARN_STREAM("Visualization is off. Running on headless mode");
    }

    // set the CDisplayWindowPlots pointer to null for starters, we don't know
    // if
    // we are using it

    m_observation_only_dataset = false;
    m_request_to_exit = false;

    // max node number already in the graph
    m_nodeID_max = INVALID_NODEID;

    m_is_paused = false;
    m_GT_poses_index = 0;

    // pass the necessary variables/objects to the deciders/optimizes
    // pass a graph ptr after the instance initialization
    m_node_reg->setGraphPtr(&m_graph);
    m_edge_reg->setGraphPtr(&m_graph);
    m_optimizer->setGraphPtr(&m_graph);

    // pass the window manager pointer
    // note: m_win_manager contains a pointer to the CDisplayWindow3D instance
    if (m_enable_visuals)
    {
        m_node_reg->setWindowManagerPtr(m_win_manager);
        m_edge_reg->setWindowManagerPtr(m_win_manager);
        m_optimizer->setWindowManagerPtr(m_win_manager);
        m_edge_counter.setWindowManagerPtr(m_win_manager);
    }

    // pass a lock in case of multithreaded implementation
    m_node_reg->setCriticalSectionPtr(&m_graph_section);
    m_edge_reg->setCriticalSectionPtr(&m_graph_section);
    m_optimizer->setCriticalSectionPtr(&m_graph_section);

    // Load the parameters that each one of the self/deciders/optimizer classes
    // needs
    this->loadParams(m_config_fname);

    if (!m_enable_visuals)
    {
        MRPT_LOG_WARN_STREAM("Switching all visualization parameters off...");
        m_visualize_odometry_poses = 0;
        m_visualize_GT = 0;
        m_visualize_map = 0;
        m_visualize_estimated_trajectory = 0;
        m_visualize_SLAM_metric = 0;
        m_enable_curr_pos_viewport = 0;
        m_enable_range_viewport = 0;
        m_enable_intensity_viewport = 0;
    }

    m_use_GT = !m_fname_GT.empty();
    if (m_use_GT)
    {
        if (mrpt::system::strCmpI(m_GT_file_format, "rgbd_tum"))
        {
            THROW_EXCEPTION("Not Implemented Yet.");
            this->alignOpticalWithMRPTFrame();
            // this->readGTFileRGBD_TUM(m_fname_GT, &m_GT_poses);
        }
        else if (mrpt::system::strCmpI(m_GT_file_format, "navsimul"))
        {
            this->readGTFile(m_fname_GT, &m_GT_poses);
        }
    }

    // plot the GT related visuals only if ground-truth file is given
    if (!m_use_GT)
    {
        MRPT_LOG_WARN_STREAM(
            "Ground truth file was not provided. Switching the related "
            "visualization parameters off...");
        m_visualize_GT = 0;
        m_visualize_SLAM_metric = 0;
    }

    // timestamp
    if (m_enable_visuals)
    {
        m_win_manager->assignTextMessageParameters(
            &m_offset_y_timestamp, &m_text_index_timestamp);
    }

    if (m_visualize_map)
    {
        this->initMapVisualization();
    }

    // Configuration of various trajectories visualization
    ASSERTDEB_(m_has_read_config);
    if (m_enable_visuals)
    {
        // odometry visualization
        if (m_visualize_odometry_poses)
        {
            this->initOdometryVisualization();
        }
        // GT Visualization
        if (m_visualize_GT)
        {
            this->initGTVisualization();
        }
        // estimated trajectory visualization
        this->initEstimatedTrajectoryVisualization();
        // current robot pose  viewport
        if (m_enable_curr_pos_viewport)
        {
            this->initCurrPosViewport();
        }
    }

    // change the CImage path in case of RGBD datasets
    if (mrpt::system::strCmpI(m_GT_file_format, "rgbd_tum"))
    {
        // keep the last path - change back to it after rawlog parsing
        m_img_prev_path_base = mrpt::img::CImage::getImagesPathBase();

        std::string rawlog_fname_noext =
            system::extractFileName(m_rawlog_fname);
        std::string rawlog_dir = system::extractFileDirectory(m_rawlog_fname);
        m_img_external_storage_dir =
            rawlog_dir + rawlog_fname_noext + "_Images/";
        mrpt::img::CImage::setImagesPathBase(m_img_external_storage_dir);
    }

    // 3DRangeScans viewports initialization, in case of RGBD datasets
    if (mrpt::system::strCmpI(m_GT_file_format, "rgbd_tum"))
    {
        if (m_enable_range_viewport)
        {
            this->initRangeImageViewport();
        }
        if (m_enable_intensity_viewport)
        {
            this->initIntensityImageViewport();
        }
    }
    // axis
    if (m_enable_visuals)
    {
        COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();

        CAxis::Ptr obj = std::make_shared<CAxis>();
        obj->setFrequency(5);
        obj->enableTickMarks();
        obj->setAxisLimits(-10, -10, -10, 10, 10, 10);
        obj->setName("axis");
        scene->insert(obj);

        m_win->unlockAccess3DScene();
        m_win->forceRepaint();
    }

    // Add additional keystrokes in the CDisplayWindow3D help textBox
    if (m_enable_visuals)
    {
        // keystrokes initialization
        m_keystroke_pause_exec = "p";
        m_keystroke_odometry = "o";
        m_keystroke_GT = "g";
        m_keystroke_estimated_trajectory = "t";
        m_keystroke_map = "m";

        // keystrokes registration
        m_win_observer->registerKeystroke(
            m_keystroke_pause_exec, "Pause/Resume program execution");
        m_win_observer->registerKeystroke(
            m_keystroke_odometry, "Toggle Odometry visualization");
        m_win_observer->registerKeystroke(
            m_keystroke_GT, "Toggle Ground-Truth visualization");
        m_win_observer->registerKeystroke(
            m_keystroke_estimated_trajectory,
            "Toggle Estimated trajectory visualization");
        m_win_observer->registerKeystroke(
            m_keystroke_map, "Toggle Map visualization");
    }

    // register the types of edges
    vector<string> vec_edge_types;
    vec_edge_types.emplace_back("Odometry");
    vec_edge_types.emplace_back("ICP2D");
    vec_edge_types.emplace_back("ICP3D");

    for (auto cit = vec_edge_types.begin(); cit != vec_edge_types.end(); ++cit)
    {
        m_edge_counter.addEdgeType(*cit);
    }

    // Visualize the edge statistics
    if (m_enable_visuals)
    {
        // total edges - loop closure edges
        double offset_y_total_edges, offset_y_loop_closures;
        int text_index_total_edges, text_index_loop_closures;

        m_win_manager->assignTextMessageParameters(
            &offset_y_total_edges, &text_index_total_edges);

        // build each one of these
        map<string, double> name_to_offset_y;
        map<string, int> name_to_text_index;
        for (auto it = vec_edge_types.begin(); it != vec_edge_types.end(); ++it)
        {
            m_win_manager->assignTextMessageParameters(
                &name_to_offset_y[*it], &name_to_text_index[*it]);
        }

        m_win_manager->assignTextMessageParameters(
            &offset_y_loop_closures, &text_index_loop_closures);

        // add all the parameters to the CEdgeCounter object
        m_edge_counter.setTextMessageParams(
            name_to_offset_y, name_to_text_index, offset_y_total_edges,
            text_index_total_edges, offset_y_loop_closures,
            text_index_loop_closures);
    }

    // Type of the generated graph
    if (m_enable_visuals)
    {
        m_win_manager->assignTextMessageParameters(
            &m_offset_y_current_constraint_type,
            &m_text_index_current_constraint_type);
        m_win_manager->addTextMessage(
            m_offset_x_left, -m_offset_y_current_constraint_type,
            m_current_constraint_type,
            mrpt::img::TColorf(m_current_constraint_type_color),
            m_text_index_current_constraint_type);
    }

    // query node/edge deciders for visual objects initialization
    if (m_enable_visuals)
    {
        std::lock_guard<std::mutex> graph_lock(m_graph_section);
        m_time_logger.enter("Visuals");
        m_node_reg->initializeVisuals();
        m_edge_reg->initializeVisuals();
        m_optimizer->initializeVisuals();
        m_time_logger.leave("Visuals");
    }

    m_init_timestamp = INVALID_TIMESTAMP;

    // COccupancyGridMap2D Initialization
    {
        mrpt::maps::COccupancyGridMap2D::Ptr gridmap =
            mrpt::maps::COccupancyGridMap2D::Create();

        gridmap->setSize(
            /* min_x = */ -20.0f,
            /* float max_x = */ 20.0f,
            /* float min_y = */ -20.0f,
            /* float max_y = */ 20.0f,
            /* float resolution = */ 0.05f);

        // TODO - Read these from the .ini file
        // observation insertion options
        gridmap->insertionOptions.maxOccupancyUpdateCertainty = 0.8f;
        gridmap->insertionOptions.maxDistanceInsertion = 5;
        gridmap->insertionOptions.wideningBeamsWithDistance = true;
        gridmap->insertionOptions.decimation = 2;

        m_gridmap_cached = gridmap;
        m_map_is_cached = false;
    }

    // COctoMap Initialization
    {
        mrpt::maps::COctoMap::Ptr octomap = mrpt::maps::COctoMap::Create();

        // TODO - adjust the insertionoptions...
        // TODO - Read these from the .ini file
        octomap->insertionOptions.setOccupancyThres(0.5);
        octomap->insertionOptions.setProbHit(0.7);
        octomap->insertionOptions.setProbMiss(0.4);
        octomap->insertionOptions.setClampingThresMin(0.1192);
        octomap->insertionOptions.setClampingThresMax(0.971);

        m_octomap_cached = octomap;
        m_map_is_cached = false;
    }

    // In case we are given an RGBD TUM Dataset - try and read the info file so
    // that we know how to play back the GT poses.
    try
    {
        m_info_params.setRawlogFile(m_rawlog_fname);
        m_info_params.parseFile();
        // set the rate at which we read from the GT poses vector
        int num_of_objects = std::atoi(
            m_info_params.fields["Overall number of objects"].c_str());
        m_GT_poses_step = m_GT_poses.size() / num_of_objects;

        MRPT_LOG_INFO_STREAM(
            "Overall number of objects in rawlog: " << num_of_objects);
        MRPT_LOG_INFO_STREAM(
            "Setting the Ground truth read step to: " << m_GT_poses_step);
    }
    catch (const std::exception& e)
    {
        MRPT_LOG_INFO_STREAM("RGBD_TUM info file was not found: " << e.what());
    }

    // SLAM evaluation metric
    m_curr_deformation_energy = 0;
    if (m_visualize_SLAM_metric)
    {
        this->initSlamMetricVisualization();
    }

    // Message to be displayed on pause
    if (m_enable_visuals)
    {
        this->m_win->addTextMessage(
            0.5, 0.3, "", mrpt::img::TColorf(1.0, 0, 0),
            m_text_index_paused_message);
    }

    MRPT_END;
}  // end of initClass

template <class GRAPH_T>
bool CGraphSlamEngine<GRAPH_T>::execGraphSlamStep(
    mrpt::obs::CObservation::Ptr& observation, size_t& rawlog_entry)
{
    using namespace mrpt::obs;

    CActionCollection::Ptr action;
    CSensoryFrame::Ptr observations;

    return this->_execGraphSlamStep(
        action, observations, observation, rawlog_entry);
}  // end of execGraphSlamStep

template <class GRAPH_T>
bool CGraphSlamEngine<GRAPH_T>::_execGraphSlamStep(
    mrpt::obs::CActionCollection::Ptr& action,
    mrpt::obs::CSensoryFrame::Ptr& observations,
    mrpt::obs::CObservation::Ptr& observation, size_t& rawlog_entry)
{
    MRPT_START;

    using namespace std;
    using namespace mrpt;
    using namespace mrpt::poses;
    using namespace mrpt::obs;
    using namespace mrpt::obs::utils;
    using namespace mrpt::opengl;
    using namespace mrpt::system;

    m_time_logger.enter("proc_time");

    ASSERTDEBMSG_(
        m_has_read_config,
        format("\nConfig file is not read yet.\nExiting... \n"));
    // good to go..

    // read first measurement independently if we haven't already
    if (m_init_timestamp == INVALID_TIMESTAMP)
    {
        m_init_timestamp = getTimeStamp(action, observations, observation);
        MRPT_LOG_DEBUG_STREAM("execGraphSlamStep: first run");

        if (observation)
        {
            MRPT_LOG_DEBUG_STREAM("Observation only dataset!");
            m_observation_only_dataset = true;  // false by default
        }
        else
        {
            MRPT_LOG_DEBUG_STREAM("Action-observation dataset!");
            ASSERTDEB_(action);
            m_observation_only_dataset = false;

            CPose3D increment_pose_3d;
            action->getFirstMovementEstimationMean(increment_pose_3d);
            pose_t increment_pose(increment_pose_3d);
            m_curr_odometry_only_pose += increment_pose;
        }

        // TODO enable this and test this.
        // return true;
    }

    // NRD
    bool registered_new_node;
    {
        std::lock_guard<std::mutex> graph_lock(m_graph_section);
        m_time_logger.enter("node_registrar");
        registered_new_node =
            m_node_reg->updateState(action, observations, observation);
        m_time_logger.leave("node_registrar");
    }

    {  // get the 2D laser scan, if there
        CObservation2DRangeScan::Ptr scan =
            getObservation<CObservation2DRangeScan>(observations, observation);
        if (scan)
        {
            m_last_laser_scan2D = scan;

            if (!m_first_laser_scan2D)
            {  // capture first laser scan seperately
                m_first_laser_scan2D = m_last_laser_scan2D;
            }
        }
    }

    if (registered_new_node)
    {
        // At the first node registration, must have registered exactly 2 nodes
        // (root + first)
        if (m_is_first_time_node_reg)
        {
            std::lock_guard<std::mutex> graph_lock(m_graph_section);
            m_nodeID_max = 0;
            if (m_graph.nodeCount() != 2)
            {
                MRPT_LOG_ERROR_STREAM(
                    "Expected [2] new registered nodes"
                    << " but got [" << m_graph.nodeCount() << "]");
                THROW_EXCEPTION(format("Illegal node registration"));
            }

            m_nodes_to_laser_scans2D.insert(
                make_pair(m_nodeID_max, m_first_laser_scan2D));

            m_is_first_time_node_reg = false;
        }

        // going to be incremented in monitorNodeRegistration anyway.
        m_nodeID_max++;

        // either way add just one odometry edge
        m_edge_counter.addEdge("Odometry");
    }
    this->monitorNodeRegistration(
        registered_new_node, "NodeRegistrationDecider");

    // Edge registration procedure - Optimization
    // run this so that the ERD, GSO can be updated with the latest
    // observations even when no new nodes have been added to the graph
    {  // ERD
        std::lock_guard<std::mutex> graph_lock(m_graph_section);

        m_time_logger.enter("edge_registrar");
        m_edge_reg->updateState(action, observations, observation);
        m_time_logger.leave("edge_registrar");
    }
    this->monitorNodeRegistration(
        registered_new_node, "EdgeRegistrationDecider");

    {  // GSO
        std::lock_guard<std::mutex> graph_lock(m_graph_section);

        m_time_logger.enter("optimizer");
        m_optimizer->updateState(action, observations, observation);
        m_time_logger.leave("optimizer");
    }
    this->monitorNodeRegistration(registered_new_node, "GraphSlamOptimizer");

    // current timestamp - to be filled depending on the format
    m_curr_timestamp = getTimeStamp(action, observations, observation);

    if (observation)
    {
        // Read a single observation from the rawlog
        // (Format #2 rawlog file)

        // odometry
        if (IS_CLASS(*observation, CObservationOdometry))
        {
            CObservationOdometry::Ptr obs_odometry =
                std::dynamic_pointer_cast<CObservationOdometry>(observation);

            m_curr_odometry_only_pose = pose_t(obs_odometry->odometry);
            m_odometry_poses.push_back(m_curr_odometry_only_pose);
        }
        else if (IS_CLASS(*observation, CObservation3DRangeScan))
        {
            m_last_laser_scan3D =
                std::dynamic_pointer_cast<mrpt::obs::CObservation3DRangeScan>(
                    observation);
        }
    }
    else
    {
        // action, observations should contain a pair of valid data
        // (Format #1 rawlog file)
        ASSERTDEB_(observations);
        ASSERTDEB_(action);

        CPose3D increment_pose_3d;
        action->getFirstMovementEstimationMean(increment_pose_3d);
        pose_t increment_pose(increment_pose_3d);
        m_curr_odometry_only_pose += increment_pose;
        m_odometry_poses.push_back(m_curr_odometry_only_pose);
    }  // ELSE FORMAT #1 - Action/Observations

    if (registered_new_node)
    {
        this->execDijkstraNodesEstimation();

        // keep track of the laser scans so that I can later visualize the map
        m_nodes_to_laser_scans2D[m_nodeID_max] = m_last_laser_scan2D;

        if (m_enable_visuals && m_visualize_map)
        {
            std::lock_guard<std::mutex> graph_lock(m_graph_section);
            // bool full_update = m_optimizer->justFullyOptimizedGraph();
            bool full_update = true;
            this->updateMapVisualization(m_nodes_to_laser_scans2D, full_update);
        }

        // query node/edge deciders for visual objects update
        if (m_enable_visuals)
        {
            this->updateAllVisuals();
        }

        // update the edge counter
        std::map<std::string, int> edge_types_to_nums;
        m_edge_reg->getEdgesStats(&edge_types_to_nums);
        if (edge_types_to_nums.size())
        {
            for (auto it = edge_types_to_nums.begin();
                 it != edge_types_to_nums.end(); ++it)
            {
                // loop closure
                if (mrpt::system::strCmpI(it->first, "lc"))
                {
                    m_edge_counter.setLoopClosureEdgesManually(it->second);
                }
                else
                {
                    m_edge_counter.setEdgesManually(it->first, it->second);
                }
            }
        }

        // update the graph visualization

        if (m_enable_curr_pos_viewport)
        {
            updateCurrPosViewport();
        }
        // update visualization of estimated trajectory
        if (m_enable_visuals)
        {
            bool full_update = true;  // don't care, do it anyway.
            m_time_logger.enter("Visuals");
            this->updateEstimatedTrajectoryVisualization(full_update);
            m_time_logger.leave("Visuals");
        }

        // refine the SLAM metric  and update its corresponding visualization
        // This is done only when the GT is available.
        if (m_use_GT)
        {
            m_time_logger.enter("SLAM_metric");
            this->computeSlamMetric(m_nodeID_max, m_GT_poses_index);
            m_time_logger.leave("SLAM_metric");
            if (m_visualize_SLAM_metric)
            {
                m_time_logger.enter("Visuals");
                this->updateSlamMetricVisualization();
                m_time_logger.leave("Visuals");
            }
        }

        // mark the map outdated
        m_map_is_cached = false;

    }  // IF REGISTERED_NEW_NODE

    //
    // Visualization related actions
    //
    m_time_logger.enter("Visuals");
    // Timestamp textMessage
    // Use the dataset timestamp otherwise fallback to
    // mrpt::system::getCurrentTime
    if (m_enable_visuals)
    {
        if (m_curr_timestamp != INVALID_TIMESTAMP)
        {
            m_win_manager->addTextMessage(
                m_offset_x_left, -m_offset_y_timestamp,
                format(
                    "Simulated time: %s",
                    timeToString(m_curr_timestamp).c_str()),
                mrpt::img::TColorf(1.0, 1.0, 1.0),
                /* unique_index = */ m_text_index_timestamp);
        }
        else
        {
            m_win_manager->addTextMessage(
                m_offset_x_left, -m_offset_y_timestamp,
                format(
                    "Wall time: %s",
                    timeToString(mrpt::system::getCurrentTime()).c_str()),
                mrpt::img::TColorf(1.0, 1.0, 1.0),
                /* unique_index = */ m_text_index_timestamp);
        }
    }

    // Odometry visualization
    if (m_visualize_odometry_poses && m_odometry_poses.size())
    {
        this->updateOdometryVisualization();
    }

    // ensure that the GT is visualized at the same rate as the SLAM procedure
    // handle RGBD-TUM datasets manually. Advance the GT index accordingly
    if (m_use_GT)
    {
        if (mrpt::system::strCmpI(m_GT_file_format, "rgbd_tum"))
        {  // 1/loop
            if (m_enable_visuals)
            {
                this->updateGTVisualization();  // I have already taken care of
                // the step
            }
            m_GT_poses_index += m_GT_poses_step;
        }
        else if (mrpt::system::strCmpI(m_GT_file_format, "navsimul"))
        {
            if (m_observation_only_dataset)
            {  // 1/2loops
                if (rawlog_entry % 2 == 0)
                {
                    if (m_enable_visuals)
                    {
                        this->updateGTVisualization();  // I have already taken
                        // care of the step
                    }
                    m_GT_poses_index += m_GT_poses_step;
                }
            }
            else
            {  // 1/loop
                // get both action and observation at a single step - same rate
                // as GT
                if (m_enable_visuals)
                {
                    this->updateGTVisualization();  // I have already taken care
                    // of the step
                }
                m_GT_poses_index += m_GT_poses_step;
            }
        }
    }

    // 3DRangeScans viewports update
    if (mrpt::system::strCmpI(m_GT_file_format, "rgbd_tum"))
    {
        if (m_enable_range_viewport && m_last_laser_scan3D)
        {
            this->updateRangeImageViewport();
        }

        if (m_enable_intensity_viewport && m_last_laser_scan3D)
        {
            this->updateIntensityImageViewport();
        }
    }

    // Query for events and take corresponding actions
    if (m_enable_visuals)
    {
        this->queryObserverForEvents();
    }
    m_time_logger.leave("Visuals");

    m_dataset_grab_time =
        mrpt::system::timeDifference(m_init_timestamp, m_curr_timestamp);
    m_time_logger.leave("proc_time");

    return !m_request_to_exit;
    MRPT_END;
}  // end of _execGraphSlamStep

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::execDijkstraNodesEstimation()
{
    {
        std::lock_guard<std::mutex> graph_lock(m_graph_section);
        m_time_logger.enter("dijkstra_nodes_estimation");
        m_graph.dijkstra_nodes_estimate();
        m_time_logger.leave("dijkstra_nodes_estimation");
    }
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::monitorNodeRegistration(
    bool registered /*=false*/, std::string class_name /*="Class"*/)
{
    MRPT_START;
    using namespace mrpt;

    std::lock_guard<std::mutex> graph_lock(m_graph_section);
    size_t listed_nodeCount =
        (m_nodeID_max == INVALID_NODEID ? 0 : m_nodeID_max + 1);

    if (!registered)
    {  // just check that it's the same.
        ASSERTDEBMSG_(
            listed_nodeCount == m_graph.nodeCount(),
            format(
                "listed_nodeCount [%lu] != nodeCount() [%lu]",
                static_cast<unsigned long>(listed_nodeCount),
                static_cast<unsigned long>(m_graph.nodeCount())));
    }
    else
    {
        if (listed_nodeCount != m_graph.nodeCount())
        {
            MRPT_LOG_ERROR_STREAM(
                class_name << " illegally added new nodes to the graph "
                           << ", wanted to see [" << listed_nodeCount
                           << "] but saw [" << m_graph.nodeCount() << "]");
            THROW_EXCEPTION(
                format("Illegal node registration by %s.", class_name.c_str()));
        }
    }
    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::getMap(
    mrpt::maps::COccupancyGridMap2D::Ptr map,
    mrpt::system::TTimeStamp* acquisition_time) const
{
    MRPT_START;

    if (!map)
    {
        map = mrpt::maps::COccupancyGridMap2D::Create();
    }
    ASSERTDEB_(map);

    if (!m_map_is_cached)
    {
        this->computeMap();
    }
    map->copyMapContentFrom(*m_gridmap_cached);

    // fill the timestamp if this is given
    if (acquisition_time)
    {
        *acquisition_time = m_map_acq_time;
    }
    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::getMap(
    mrpt::maps::COctoMap::Ptr map,
    mrpt::system::TTimeStamp* acquisition_time) const
{
    MRPT_START;
    THROW_EXCEPTION("Not Implemented Yet.");

    if (!m_map_is_cached)
    {
        this->computeMap();
    }
    //  map =
    // dynamic_cast<mrpt::maps::COctoMap::Ptr>(m_octomap_cached->clone());
    ASSERTDEB_(map);

    // fill the timestamp if this is given
    if (acquisition_time)
    {
        *acquisition_time = m_map_acq_time;
    }

    MRPT_END;
}

template <class GRAPH_T>
inline void CGraphSlamEngine<GRAPH_T>::computeMap() const
{
    MRPT_START;
    using namespace std;
    using namespace mrpt;
    using namespace mrpt::maps;
    using namespace mrpt::poses;

    std::lock_guard<std::mutex> graph_lock(m_graph_section);

    if (!constraint_t::is_3D())
    {  // 2D Poses
        // MRPT_LOG_DEBUG_STREAM("Computing the occupancy gridmap...");
        mrpt::maps::COccupancyGridMap2D::Ptr gridmap = m_gridmap_cached;
        gridmap->clear();

        // traverse all the nodes - add their laser scans at their corresponding
        // poses
        for (auto it = m_nodes_to_laser_scans2D.begin();
             it != m_nodes_to_laser_scans2D.end(); ++it)
        {
            const mrpt::graphs::TNodeID& curr_node = it->first;

            // fetch LaserScan
            const mrpt::obs::CObservation2DRangeScan::Ptr& curr_laser_scan =
                it->second;
            ASSERTDEBMSG_(
                curr_laser_scan, format(
                                     "LaserScan of nodeID: %lu is not present.",
                                     static_cast<unsigned long>(curr_node)));

            // Fetch pose at which to display the LaserScan
            CPose3D scan_pose = getLSPoseForGridMapVisualization(curr_node);

            // Add all to gridmap
            gridmap->insertObservation(*curr_laser_scan, &scan_pose);
        }

        m_map_is_cached = true;
        m_map_acq_time = mrpt::system::now();
    }
    else
    {  // 3D Pose
        // MRPT_LOG_DEBUG_STREAM("Computing the Octomap...");
        THROW_EXCEPTION("Not Implemented Yet. Method is to compute a COctoMap");
        // MRPT_LOG_DEBUG_STREAM("Computed COctoMap successfully.");
    }

    MRPT_END;
}  // end of computeMap

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::loadParams(const std::string& fname)
{
    MRPT_START;

    ASSERTDEBMSG_(
        mrpt::system::fileExists(fname),
        mrpt::format("\nConfiguration file not found: \n%s\n", fname.c_str()));

    mrpt::config::CConfigFile cfg_file(fname);

    // Section: GeneralConfiguration

    m_user_decides_about_output_dir = cfg_file.read_bool(
        "GeneralConfiguration", "user_decides_about_output_dir", false, false);
    m_GT_file_format = cfg_file.read_string(
        "GeneralConfiguration", "ground_truth_file_format", "NavSimul", false);

    // Minimum verbosity level of the logger
    int min_verbosity_level =
        cfg_file.read_int("GeneralConfiguration", "class_verbosity", 1, false);
    this->setMinLoggingLevel(mrpt::system::VerbosityLevel(min_verbosity_level));

    // Section: VisualizationParameters

    // map visualization
    m_visualize_map = cfg_file.read_bool(
        "VisualizationParameters", "visualize_map", true, false);

    // odometry-only visualization
    m_visualize_odometry_poses = cfg_file.read_bool(
        "VisualizationParameters", "visualize_odometry_poses", true, false);
    m_visualize_estimated_trajectory = cfg_file.read_bool(
        "VisualizationParameters", "visualize_estimated_trajectory", true,
        false);

    // GT configuration visualization
    m_visualize_GT = cfg_file.read_bool(
        "VisualizationParameters", "visualize_ground_truth", true, false);
    // SLAM metric plot
    m_visualize_SLAM_metric = cfg_file.read_bool(
        "VisualizationParameters", "visualize_SLAM_metric", true, false);

    // Viewports flags
    m_enable_curr_pos_viewport = cfg_file.read_bool(
        "VisualizationParameters", "enable_curr_pos_viewport", true, false);
    m_enable_range_viewport = cfg_file.read_bool(
        "VisualizationParameters", "enable_range_viewport", false, false);
    m_enable_intensity_viewport = cfg_file.read_bool(
        "VisualizationParameters", "enable_intensity_viewport", false, false);

    m_node_reg->loadParams(fname);
    m_edge_reg->loadParams(fname);
    m_optimizer->loadParams(fname);

    m_has_read_config = true;
    MRPT_END;
}
template <class GRAPH_T>
std::string CGraphSlamEngine<GRAPH_T>::getParamsAsString() const
{
    MRPT_START;

    std::string str;
    this->getParamsAsString(&str);
    return str;

    MRPT_END;
}
template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::getParamsAsString(std::string* params_out) const
{
    MRPT_START;
    ASSERTDEB_(m_has_read_config);
    using namespace std;

    stringstream ss_out;

    ss_out
        << "\n------------[ Graphslam_engine Problem Parameters ]------------"
        << std::endl;
    ss_out << "Config filename                 = " << m_config_fname
           << std::endl;

    ss_out << "Ground Truth File format        = " << m_GT_file_format
           << std::endl;
    ss_out << "Ground Truth filename           = " << m_fname_GT << std::endl;

    ss_out << "Visualize odometry              = "
           << (m_visualize_odometry_poses ? "TRUE" : "FALSE") << std::endl;
    ss_out << "Visualize estimated trajectory  = "
           << (m_visualize_estimated_trajectory ? "TRUE" : "FALSE")
           << std::endl;
    ss_out << "Visualize map                   = "
           << (m_visualize_map ? "TRUE" : "FALSE") << std::endl;
    ss_out << "Visualize Ground Truth          = "
           << (m_visualize_GT ? "TRUE" : "FALSE") << std::endl;

    ss_out << "Visualize SLAM metric plot      = "
           << (m_visualize_SLAM_metric ? "TRUE" : "FALSE") << std::endl;

    ss_out << "Enable curr. position viewport  = "
           << (m_enable_curr_pos_viewport ? "TRUE" : "FALSE") << endl;
    ss_out << "Enable range img viewport       = "
           << (m_enable_range_viewport ? "TRUE" : "FALSE") << endl;
    ss_out << "Enable intensity img viewport   = "
           << (m_enable_intensity_viewport ? "TRUE" : "FALSE") << endl;

    ss_out << "-----------------------------------------------------------"
           << std::endl;
    ss_out << std::endl;

    // copy the stringstream contents to the passed in string
    *params_out = ss_out.str();

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::printParams() const
{
    MRPT_START;
    std::cout << getParamsAsString();

    m_node_reg->printParams();
    m_edge_reg->printParams();
    m_optimizer->printParams();

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::initResultsFile(const std::string& fname)
{
    MRPT_START;
    using namespace std;
    using namespace mrpt::system;

    MRPT_LOG_INFO_STREAM("Setting up file: " << fname);

    // current time vars
    mrpt::system::TTimeStamp cur_date(getCurrentTime());
    std::string time_spec = "UTC Time";
    string cur_date_str(dateTimeToString(cur_date));
    string cur_date_validstr(fileNameStripInvalidChars(cur_date_str));

    m_out_streams[fname].open(fname);
    ASSERTDEBMSG_(
        m_out_streams[fname].fileOpenCorrectly(),
        mrpt::format("\nError while trying to open %s\n", fname.c_str()));

    const std::string sep(80, '#');

    m_out_streams[fname].printf("# Mobile Robot Programming Toolkit (MRPT)\n");
    m_out_streams[fname].printf("# http::/www.mrpt.org\n");
    m_out_streams[fname].printf("# GraphSlamEngine Application\n");
    m_out_streams[fname].printf(
        "# Automatically generated file - %s: %s\n", time_spec.c_str(),
        cur_date_str.c_str());
    m_out_streams[fname].printf("%s\n\n", sep.c_str());

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::initRangeImageViewport()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::opengl;

    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();
    COpenGLViewport::Ptr viewp_range;

    viewp_range = scene->createViewport("viewp_range");
    double x, y, h, w;
    m_win_manager->assignViewportParameters(&x, &y, &w, &h);
    viewp_range->setViewportPosition(x, y, h, w);

    m_win->unlockAccess3DScene();
    m_win->forceRepaint();

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::updateAllVisuals()
{
    MRPT_START;
    std::lock_guard<std::mutex> graph_lock(m_graph_section);
    m_time_logger.enter("Visuals");

    m_node_reg->updateVisuals();
    m_edge_reg->updateVisuals();
    m_optimizer->updateVisuals();

    m_time_logger.leave("Visuals");
    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::updateRangeImageViewport()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::math;
    using namespace mrpt::opengl;

    if (m_last_laser_scan3D->hasRangeImage)
    {
        // TODO - make this a static class member - or at least a private member
        // of the class

        mrpt::img::CImage img;

        // load the image if not already loaded..
        m_last_laser_scan3D->load();
        img.setFromMatrix(
            m_last_laser_scan3D->rangeImage, false /* do normalize */);

        COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();
        COpenGLViewport::Ptr viewp_range = scene->getViewport("viewp_range");
        viewp_range->setImageView(img);
        m_win->unlockAccess3DScene();
        m_win->forceRepaint();
    }

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::initIntensityImageViewport()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::opengl;

    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();
    COpenGLViewport::Ptr viewp_intensity;

    viewp_intensity = scene->createViewport("viewp_intensity");
    double x, y, w, h;
    m_win_manager->assignViewportParameters(&x, &y, &w, &h);
    viewp_intensity->setViewportPosition(x, y, w, h);

    m_win->unlockAccess3DScene();
    m_win->forceRepaint();

    MRPT_END;
}
template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::updateIntensityImageViewport()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::opengl;

    if (m_last_laser_scan3D->hasIntensityImage)
    {
        mrpt::img::CImage img;

        // load the image if not already loaded..
        m_last_laser_scan3D->load();
        img = m_last_laser_scan3D->intensityImage;

        COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();
        COpenGLViewport::Ptr viewp_intensity =
            scene->getViewport("viewp_intensity");
        viewp_intensity->setImageView(img);
        m_win->unlockAccess3DScene();
        m_win->forceRepaint();
    }

    MRPT_END;
}  // end of updateIntensityImageViewport

template <class GRAPH_T>
mrpt::opengl::CSetOfObjects::Ptr
    CGraphSlamEngine<GRAPH_T>::initRobotModelVisualization()
{
    pose_t p;
    return this->initRobotModelVisualizationInternal(p);
}  // end of initRobotModelVisualization

template <class GRAPH_T>
mrpt::opengl::CSetOfObjects::Ptr
    CGraphSlamEngine<GRAPH_T>::initRobotModelVisualizationInternal(
        const mrpt::poses::CPose2D& p_unused)
{
    return mrpt::opengl::stock_objects::RobotPioneer();

}  // end of initRobotModelVisualizationInternal - CPose2D

template <class GRAPH_T>
mrpt::opengl::CSetOfObjects::Ptr
    CGraphSlamEngine<GRAPH_T>::initRobotModelVisualizationInternal(
        const mrpt::poses::CPose3D& p_unused)
{
    return mrpt::opengl::stock_objects::CornerXYZ();
}  // end of initRobotModelVisualizationInternal - CPose3D

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::initCurrPosViewport()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::opengl;

    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();
    COpenGLViewport::Ptr viewp =
        scene->createViewport("curr_robot_pose_viewport");
    // Add a clone viewport, using [0,1] factor X,Y,Width,Height coordinates:
    viewp->setCloneView("main");
    double x, y, h, w;
    m_win_manager->assignViewportParameters(&x, &y, &w, &h);
    viewp->setViewportPosition(x, y, h, w);
    viewp->setTransparent(false);
    viewp->getCamera().setAzimuthDegrees(90);
    viewp->getCamera().setElevationDegrees(90);
    viewp->setCustomBackgroundColor(
        mrpt::img::TColorf(205, 193, 197, /*alpha = */ 255));
    viewp->getCamera().setZoomDistance(30);
    viewp->getCamera().setOrthogonal();

    m_win->unlockAccess3DScene();
    m_win->forceRepaint();

    MRPT_END;
}

template <class GRAPH_T>
inline void CGraphSlamEngine<GRAPH_T>::updateCurrPosViewport()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::opengl;
    using namespace mrpt::poses;

    ASSERTDEB_(m_enable_visuals);

    global_pose_t curr_robot_pose = this->getCurrentRobotPosEstimation();

    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();
    COpenGLViewport::Ptr viewp = scene->getViewport("curr_robot_pose_viewport");
    viewp->getCamera().setPointingAt(CPose3D(curr_robot_pose));

    m_win->unlockAccess3DScene();
    m_win->forceRepaint();
    MRPT_LOG_DEBUG_STREAM("Updated the \"current_pos\" viewport");

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::readGTFile(
    const std::string& fname_GT, std::vector<mrpt::poses::CPose2D>* gt_poses,
    std::vector<mrpt::system::TTimeStamp>* gt_timestamps)
{
    MRPT_START;
    using namespace std;
    using namespace mrpt::system;

    // make sure file exists
    ASSERTDEBMSG_(
        fileExists(fname_GT),
        format(
            "\nGround-truth file %s was not found.\n"
            "Either specify a valid ground-truth filename or set set the "
            "m_visualize_GT flag to false\n",
            fname_GT.c_str()));

    mrpt::io::CFileInputStream file_GT(fname_GT);
    ASSERTDEBMSG_(file_GT.fileOpenCorrectly(), "\nCouldn't open GT file\n");
    ASSERTDEBMSG_(gt_poses, "\nNo valid std::vector<pose_t>* was given\n");

    string curr_line;

    // parse the file - get timestamp and pose and fill in the pose_t vector
    for (size_t line_num = 0; file_GT.readLine(curr_line); line_num++)
    {
        vector<string> curr_tokens;
        system::tokenize(curr_line, " ", curr_tokens);

        // check the current pose dimensions
        ASSERTDEBMSG_(
            curr_tokens.size() == constraint_t::state_length + 1,
            "\nGround Truth File doesn't seem to contain data as generated by "
            "the "
            "GridMapNavSimul application.\n Either specify the GT file format "
            "or set "
            "visualize_ground_truth to false in the .ini file\n");

        // timestamp
        if (gt_timestamps)
        {
            auto timestamp =
                mrpt::Clock::fromDouble(atof(curr_tokens[0].c_str()));
            gt_timestamps->push_back(timestamp);
        }

        // pose
        pose_t curr_pose(
            atof(curr_tokens[1].c_str()), atof(curr_tokens[2].c_str()),
            atof(curr_tokens[3].c_str()));
        gt_poses->push_back(curr_pose);
    }

    file_GT.close();

    MRPT_END;
}
template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::readGTFile(
    const std::string& fname_GT, std::vector<mrpt::poses::CPose3D>* gt_poses,
    std::vector<mrpt::system::TTimeStamp>* gt_timestamps)
{
    THROW_EXCEPTION("Not implemented.");
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::readGTFileRGBD_TUM(
    const std::string& fname_GT, std::vector<mrpt::poses::CPose2D>* gt_poses,
    std::vector<mrpt::system::TTimeStamp>* gt_timestamps)
{
    MRPT_START;
    using namespace std;
    using namespace mrpt::math;
    using namespace mrpt::system;

    // make sure file exists
    ASSERTDEBMSG_(
        fileExists(fname_GT),
        format(
            "\nGround-truth file %s was not found.\n"
            "Either specify a valid ground-truth filename or set set the "
            "m_visualize_GT flag to false\n",
            fname_GT.c_str()));

    mrpt::io::CFileInputStream file_GT(fname_GT);
    ASSERTDEBMSG_(
        file_GT.fileOpenCorrectly(),
        "\nreadGTFileRGBD_TUM: Couldn't openGT file\n");
    ASSERTDEBMSG_(gt_poses, "No valid std::vector<pose_t>* was given");

    string curr_line;

    // move to the first non-commented immediately - comments before this..
    for (size_t i = 0; file_GT.readLine(curr_line); i++)
    {
        if (curr_line.at(0) != '#')
        {
            break;
        }
    }

    // handle the first pose seperately
    // make sure that the ground-truth starts at 0.
    pose_t pose_diff;
    vector<string> curr_tokens;
    mrpt::system::tokenize(curr_line, " ", curr_tokens);

    // check the current pose dimensions
    ASSERTDEBMSG_(
        curr_tokens.size() == 8,
        "\nGround Truth File doesn't seem to contain data as specified in "
        "RGBD_TUM related "
        "datasets.\n Either specify correct the GT file format or set "
        "visualize_ground_truth to false in the .ini file\n");

    // quaternion
    CQuaternionDouble quat;
    quat.r(atof(curr_tokens[7].c_str()));
    quat.x(atof(curr_tokens[4].c_str()));
    quat.y(atof(curr_tokens[5].c_str()));
    quat.z(atof(curr_tokens[6].c_str()));
    double r, p, y;
    quat.rpy(r, p, y);

    CVectorDouble curr_coords(3);
    curr_coords[0] = atof(curr_tokens[1].c_str());
    curr_coords[1] = atof(curr_tokens[2].c_str());
    curr_coords[2] = atof(curr_tokens[3].c_str());

    // initial pose
    pose_t curr_pose(curr_coords[0], curr_coords[1], y);
    // pose_t curr_pose(0, 0, 0);

    pose_diff = curr_pose;

    // parse the file - get timestamp and pose and fill in the pose_t vector
    for (; file_GT.readLine(curr_line);)
    {
        system::tokenize(curr_line, " ", curr_tokens);
        ASSERTDEBMSG_(
            curr_tokens.size() == 8,
            "\nGround Truth File doesn't seem to contain data as specified in "
            "RGBD_TUM related "
            "datasets.\n Either specify correct the GT file format or set "
            "visualize_ground_truth to false in the .ini file\n");

        // timestamp
        if (gt_timestamps)
        {
            auto timestamp =
                mrpt::Clock::fromDouble(atof(curr_tokens[0].c_str()));
            gt_timestamps->push_back(timestamp);
        }

        // quaternion
        quat.r(atof(curr_tokens[7].c_str()));
        quat.x(atof(curr_tokens[4].c_str()));
        quat.y(atof(curr_tokens[5].c_str()));
        quat.z(atof(curr_tokens[6].c_str()));
        quat.rpy(r, p, y);

        // pose
        curr_coords[0] = atof(curr_tokens[1].c_str());
        curr_coords[1] = atof(curr_tokens[2].c_str());
        curr_coords[2] = atof(curr_tokens[3].c_str());

        // current ground-truth pose
        pose_t gt_pose(curr_coords[0], curr_coords[1], y);

        gt_pose.x() -= pose_diff.x();
        gt_pose.y() -= pose_diff.y();
        gt_pose.phi() -= pose_diff.phi();
        // curr_pose += -pose_diff;
        gt_poses->push_back(gt_pose);
    }

    file_GT.close();

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::alignOpticalWithMRPTFrame()
{
    MRPT_START;
    using namespace std;
    using namespace mrpt::math;

    // aligning GT (optical) frame with the MRPT frame
    // Set the rotation matrix from the corresponding RPY angles
    // MRPT Frame: X->forward; Y->Left; Z->Upward
    // Optical Frame: X->Right; Y->Downward; Z->Forward
    ASSERTDEB_(m_has_read_config);
    // rotz
    double anglez = DEG2RAD(0.0);
    const double tmpz[] = {
        cos(anglez), -sin(anglez), 0, sin(anglez), cos(anglez), 0, 0, 0, 1};
    CMatrixDouble rotz(3, 3, tmpz);

    // roty
    double angley = DEG2RAD(0.0);
    // double angley = DEG2RAD(90.0);
    const double tmpy[] = {cos(angley),  0, sin(angley), 0, 1, 0,
                           -sin(angley), 0, cos(angley)};
    CMatrixDouble roty(3, 3, tmpy);

    // rotx
    // double anglex = DEG2RAD(-90.0);
    double anglex = DEG2RAD(0.0);
    const double tmpx[] = {
        1, 0, 0, 0, cos(anglex), -sin(anglex), 0, sin(anglex), cos(anglex)};
    CMatrixDouble rotx(3, 3, tmpx);

    stringstream ss_out;
    ss_out << "\nConstructing the rotation matrix for the GroundTruth Data..."
           << endl;
    m_rot_TUM_to_MRPT = rotz * roty * rotx;

    ss_out << "Rotation matrices for optical=>MRPT transformation" << endl;
    ss_out << "rotz: " << endl << rotz << endl;
    ss_out << "roty: " << endl << roty << endl;
    ss_out << "rotx: " << endl << rotx << endl;
    ss_out << "Full rotation matrix: " << endl << m_rot_TUM_to_MRPT << endl;

    MRPT_LOG_DEBUG_STREAM(ss_out);

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::queryObserverForEvents()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    ASSERTDEBMSG_(
        m_win_observer,
        "\nqueryObserverForEvents method was called even though no Observer "
        "object was provided\n");

    std::map<std::string, bool> events_occurred;
    m_win_observer->returnEventsStruct(&events_occurred);
    m_request_to_exit = events_occurred.find("Ctrl+c")->second;

    // odometry visualization
    if (events_occurred[m_keystroke_odometry])
    {
        this->toggleOdometryVisualization();
    }
    // GT visualization
    if (events_occurred[m_keystroke_GT])
    {
        this->toggleGTVisualization();
    }
    // Map visualization
    if (events_occurred[m_keystroke_map])
    {
        this->toggleMapVisualization();
    }
    // Estimated Trajectory Visualization
    if (events_occurred[m_keystroke_estimated_trajectory])
    {
        this->toggleEstimatedTrajectoryVisualization();
    }
    // pause/resume program execution
    if (events_occurred[m_keystroke_pause_exec])
    {
        this->togglePause();
    }

    // notify the deciders/optimizer of any events they may be interested in
    // MRPT_LOG_DEBUG_STREAM("Notifying deciders/optimizer for events");
    m_node_reg->notifyOfWindowEvents(events_occurred);
    m_edge_reg->notifyOfWindowEvents(events_occurred);
    m_optimizer->notifyOfWindowEvents(events_occurred);

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::toggleOdometryVisualization()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::opengl;
    MRPT_LOG_INFO_STREAM("Toggling Odometry visualization...");

    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();

    if (m_visualize_odometry_poses)
    {
        CRenderizable::Ptr obj = scene->getByName("odometry_poses_cloud");
        obj->setVisibility(!obj->isVisible());

        obj = scene->getByName("robot_odometry_poses");
        obj->setVisibility(!obj->isVisible());
    }
    else
    {
        dumpVisibilityErrorMsg("visualize_odometry_poses");
    }

    m_win->unlockAccess3DScene();
    m_win->forceRepaint();

    MRPT_END;
}
template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::toggleGTVisualization()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::opengl;
    MRPT_LOG_INFO_STREAM("Toggling Ground Truth visualization");

    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();

    if (m_visualize_GT)
    {
        CRenderizable::Ptr obj = scene->getByName("GT_cloud");
        obj->setVisibility(!obj->isVisible());

        obj = scene->getByName("robot_GT");
        obj->setVisibility(!obj->isVisible());
    }
    else
    {
        dumpVisibilityErrorMsg("visualize_ground_truth");
    }

    m_win->unlockAccess3DScene();
    m_win->forceRepaint();

    MRPT_END;
}
template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::toggleMapVisualization()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace std;
    using namespace mrpt::opengl;
    MRPT_LOG_INFO_STREAM("Toggling Map visualization... ");

    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();

    // get total number of nodes
    int num_of_nodes;
    {
        std::lock_guard<std::mutex> graph_lock(m_graph_section);
        num_of_nodes = m_graph.nodeCount();
    }

    // name of gui object
    stringstream scan_name("");

    for (int node_cnt = 0; node_cnt != num_of_nodes; ++node_cnt)
    {
        // build the name of the potential corresponding object in the scene
        scan_name.str("");
        scan_name << "laser_scan_";
        scan_name << node_cnt;

        CRenderizable::Ptr obj = scene->getByName(scan_name.str());
        // current node may not have laserScans => may not have corresponding
        // obj
        if (obj)
        {
            obj->setVisibility(!obj->isVisible());
        }
    }
    m_win->unlockAccess3DScene();
    m_win->forceRepaint();

    MRPT_END;
}
template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::toggleEstimatedTrajectoryVisualization()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::opengl;
    MRPT_LOG_INFO_STREAM("Toggling Estimated Trajectory visualization... ");

    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();

    if (m_visualize_estimated_trajectory)
    {
        CRenderizable::Ptr obj = scene->getByName("estimated_traj_setoflines");
        obj->setVisibility(!obj->isVisible());

        obj = scene->getByName("robot_estimated_traj");
        obj->setVisibility(!obj->isVisible());
    }
    else
    {
        dumpVisibilityErrorMsg("visualize_estimated_trajectory");
    }

    m_win->unlockAccess3DScene();
    m_win->forceRepaint();

    MRPT_END;
}
template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::dumpVisibilityErrorMsg(
    std::string viz_flag, int sleep_time)
{
    MRPT_START;

    MRPT_LOG_ERROR_STREAM(
        "Cannot toggle visibility of specified object.\n"
        << "Make sure that the corresponding visualization flag (" << viz_flag
        << ") is set to true in the .ini file.");
    std::this_thread::sleep_for(std::chrono::milliseconds(sleep_time));

    MRPT_END;
}

template <class GRAPH_T>
mrpt::system::TTimeStamp CGraphSlamEngine<GRAPH_T>::getTimeStamp(
    const mrpt::obs::CActionCollection::Ptr action,
    const mrpt::obs::CSensoryFrame::Ptr observations,
    const mrpt::obs::CObservation::Ptr observation)
{
    MRPT_START;
    using namespace mrpt::obs;
    using namespace mrpt::system;

    // make sure that adequate data is given.
    ASSERTDEBMSG_(
        action || observation,
        "Neither action or observation contains valid data.");

    mrpt::system::TTimeStamp timestamp = INVALID_TIMESTAMP;
    if (observation)
    {
        timestamp = observation->timestamp;
    }
    else
    {
        // querry action part first
        timestamp = action->get(0)->timestamp;

        // if still not available query the observations in the CSensoryFrame
        if (timestamp == INVALID_TIMESTAMP)
        {
            for (auto sens_it = observations->begin();
                 sens_it != observations->end(); ++sens_it)
            {
                timestamp = (*sens_it)->timestamp;
                if (timestamp != INVALID_TIMESTAMP)
                {
                    break;
                }
            }
        }
    }
    return timestamp;
    MRPT_END;
}

template <class GRAPH_T>
mrpt::poses::CPose3D
    CGraphSlamEngine<GRAPH_T>::getLSPoseForGridMapVisualization(
        const mrpt::graphs::TNodeID nodeID) const
{
    return mrpt::poses::CPose3D(m_graph.nodes.at(nodeID));
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::initMapVisualization()
{
    using namespace mrpt::opengl;

    CSetOfObjects::Ptr map_obj = std::make_shared<CSetOfObjects>();
    map_obj->setName("map");
    COpenGLScene::Ptr& scene = this->m_win->get3DSceneAndLock();
    scene->insert(map_obj);
    this->m_win->unlockAccess3DScene();
    this->m_win->forceRepaint();
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::updateMapVisualization(
    const std::map<
        mrpt::graphs::TNodeID, mrpt::obs::CObservation2DRangeScan::Ptr>&
        nodes_to_laser_scans2D,
    bool full_update)
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::obs;
    using namespace mrpt::opengl;
    using namespace std;
    using namespace mrpt::poses;
    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();
    CSetOfObjects::Ptr map_obj;
    {
        CRenderizable::Ptr obj = scene->getByName("map");
        map_obj = std::dynamic_pointer_cast<CSetOfObjects>(obj);
        ASSERTDEB_(map_obj);
    }

    mrpt::system::CTicTac map_update_timer;
    map_update_timer.Tic();

    // get the set of nodes for which to run the update
    std::set<mrpt::graphs::TNodeID> nodes_set;
    {
        if (full_update)
        {
            // for all the nodes get the node position and the corresponding
            // laser scan
            // if they were recorded and visualize them
            m_graph.getAllNodes(nodes_set);
            MRPT_LOG_DEBUG_STREAM("Executing full update of the map visuals");
            map_obj->clear();

        }  // end if - full update
        else
        {  // add only current nodeID
            nodes_set.insert(m_nodeID_max);
        }  // end if - partial update
    }

    // for all the nodes in the previously populated set
    for (mrpt::graphs::TNodeID node_it : nodes_set)
    {
        // name of gui object
        stringstream scan_name("");
        scan_name << "laser_scan_";
        scan_name << node_it;

        // get the node laser scan
        CObservation2DRangeScan::Ptr scan_content;
        auto search = nodes_to_laser_scans2D.find(node_it);

        // make sure that the laser scan exists and is valid
        if (search != nodes_to_laser_scans2D.end() && search->second)
        {
            scan_content = search->second;

            CObservation2DRangeScan scan_decimated;
            this->decimateLaserScan(
                *scan_content, &scan_decimated,
                /*keep_every_n_entries = */ 5);

            // if the scan doesn't already exist, add it to the map object,
            // otherwise just
            // adjust its pose
            CRenderizable::Ptr obj = map_obj->getByName(scan_name.str());
            CSetOfObjects::Ptr scan_obj =
                std::dynamic_pointer_cast<CSetOfObjects>(obj);
            if (!scan_obj)
            {
                scan_obj = std::make_shared<CSetOfObjects>();

                // creating and inserting the observation in the CSetOfObjects
                mrpt::maps::CSimplePointsMap m;
                m.insertObservation(scan_decimated);
                m.getAs3DObject(scan_obj);

                scan_obj->setName(scan_name.str());
                this->setObjectPropsFromNodeID(node_it, scan_obj);

                // set the visibility of the object the same value as the
                // visibility of
                // the previous - Needed for proper toggling of the visibility
                // of the
                // whole map
                {
                    stringstream prev_scan_name("");
                    prev_scan_name << "laser_scan_" << node_it - 1;
                    CRenderizable::Ptr prev_obj =
                        map_obj->getByName(prev_scan_name.str());
                    if (prev_obj)
                    {
                        scan_obj->setVisibility(prev_obj->isVisible());
                    }
                }

                map_obj->insert(scan_obj);
            }
            else
            {
                scan_obj = std::dynamic_pointer_cast<CSetOfObjects>(scan_obj);
            }

            // finally set the pose correctly - as computed by graphSLAM
            const CPose3D& scan_pose = CPose3D(m_graph.nodes.at(node_it));
            scan_obj->setPose(scan_pose);
        }
        else
        {
            MRPT_LOG_DEBUG_STREAM(
                "Laser scans of NodeID " << node_it << "are  empty/invalid");
        }

    }  // end for set of nodes

    m_win->unlockAccess3DScene();
    m_win->forceRepaint();

    double elapsed_time = map_update_timer.Tac();
    MRPT_LOG_DEBUG_STREAM(
        "updateMapVisualization took: " << elapsed_time << "s");
    MRPT_END;
}  // end of updateMapVisualization

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::setObjectPropsFromNodeID(
    const mrpt::graphs::TNodeID nodeID,
    mrpt::opengl::CSetOfObjects::Ptr& viz_object)
{
    MRPT_START;
    viz_object->setColor_u8(m_optimized_map_color);
    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::decimateLaserScan(
    mrpt::obs::CObservation2DRangeScan& laser_scan_in,
    mrpt::obs::CObservation2DRangeScan* laser_scan_out,
    const int keep_every_n_entries /*= 2*/)
{
    MRPT_START;

    size_t scan_size = laser_scan_in.scan.size();

    // assign the decimated scans, ranges
    std::vector<float> new_scan(
        scan_size);  // Was [], but can't use non-constant argument with arrays
    std::vector<char> new_validRange(scan_size);
    size_t new_scan_size = 0;
    for (size_t i = 0; i != scan_size; i++)
    {
        if (i % keep_every_n_entries == 0)
        {
            new_scan[new_scan_size] = laser_scan_in.scan[i];
            new_validRange[new_scan_size] = laser_scan_in.validRange[i];
            new_scan_size++;
        }
    }
    laser_scan_out->loadFromVectors(
        new_scan_size, &new_scan[0], &new_validRange[0]);

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::initGTVisualization()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::opengl;

    // assertions
    ASSERTDEB_(m_has_read_config);
    ASSERTDEB_(
        m_win &&
        "Visualization of data was requested but no CDisplayWindow3D pointer "
        "was provided");

    // point cloud
    CPointCloud::Ptr GT_cloud = std::make_shared<CPointCloud>();
    GT_cloud->setPointSize(1.0);
    GT_cloud->enablePointSmooth();
    GT_cloud->enableColorFromX(false);
    GT_cloud->enableColorFromY(false);
    GT_cloud->enableColorFromZ(false);
    GT_cloud->setColor_u8(m_GT_color);
    GT_cloud->setName("GT_cloud");

    // robot model
    CSetOfObjects::Ptr robot_model = this->setCurrentPositionModel(
        "robot_GT", m_GT_color, m_robot_model_size);

    // insert them to the scene
    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();
    scene->insert(GT_cloud);
    scene->insert(robot_model);
    m_win->unlockAccess3DScene();

    m_win_manager->assignTextMessageParameters(
        &m_offset_y_GT, &m_text_index_GT);
    m_win_manager->addTextMessage(
        m_offset_x_left, -m_offset_y_GT, mrpt::format("Ground truth path"),
        mrpt::img::TColorf(m_GT_color), m_text_index_GT);
    m_win->forceRepaint();

    MRPT_END;
}  // end of initGTVisualization

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::updateGTVisualization()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::opengl;

    // add to the GT PointCloud and visualize it
    // check that GT vector is not depleted
    if (m_visualize_GT && m_GT_poses_index < m_GT_poses.size())
    {
        ASSERTDEB_(
            m_win &&
            "Visualization of data was requested but no CDisplayWindow3D "
            "pointer was given");

        COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();

        CRenderizable::Ptr obj = scene->getByName("GT_cloud");
        CPointCloud::Ptr GT_cloud = std::dynamic_pointer_cast<CPointCloud>(obj);

        // add the latest GT pose
        mrpt::poses::CPose3D p(m_GT_poses[m_GT_poses_index]);
        GT_cloud->insertPoint(p.x(), p.y(), p.z());

        // robot model of GT trajectory
        obj = scene->getByName("robot_GT");
        CSetOfObjects::Ptr robot_obj =
            std::dynamic_pointer_cast<CSetOfObjects>(obj);
        robot_obj->setPose(p);
        m_win->unlockAccess3DScene();
        m_win->forceRepaint();
    }

    MRPT_END;
}  // end of updateGTVisualization

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::initOdometryVisualization()
{
    MRPT_START;
    ASSERTDEB_(m_has_read_config);
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::opengl;

    // point cloud
    CPointCloud::Ptr odometry_poses_cloud = std::make_shared<CPointCloud>();
    odometry_poses_cloud->setPointSize(1.0);
    odometry_poses_cloud->enablePointSmooth();
    odometry_poses_cloud->enableColorFromX(false);
    odometry_poses_cloud->enableColorFromY(false);
    odometry_poses_cloud->enableColorFromZ(false);
    odometry_poses_cloud->setColor_u8(m_odometry_color);
    odometry_poses_cloud->setName("odometry_poses_cloud");

    // robot model
    CSetOfObjects::Ptr robot_model = this->setCurrentPositionModel(
        "robot_odometry_poses", m_odometry_color, m_robot_model_size);

    // insert them to the scene
    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();
    scene->insert(odometry_poses_cloud);
    scene->insert(robot_model);
    m_win->unlockAccess3DScene();

    m_win_manager->assignTextMessageParameters(
        &m_offset_y_odometry, &m_text_index_odometry);
    m_win_manager->addTextMessage(
        m_offset_x_left, -m_offset_y_odometry, mrpt::format("Odometry path"),
        mrpt::img::TColorf(m_odometry_color), m_text_index_odometry);

    m_win->forceRepaint();

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::updateOdometryVisualization()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    ASSERTDEBMSG_(
        m_win,
        "Visualization of data was requested but no CDisplayWindow3D pointer "
        "was given");
    using namespace mrpt::opengl;

    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();

    // point cloud
    CRenderizable::Ptr obj = scene->getByName("odometry_poses_cloud");
    CPointCloud::Ptr odometry_poses_cloud =
        std::dynamic_pointer_cast<CPointCloud>(obj);
    mrpt::poses::CPose3D p(m_odometry_poses.back());

    odometry_poses_cloud->insertPoint(p.x(), p.y(), p.z());

    // robot model
    obj = scene->getByName("robot_odometry_poses");
    CSetOfObjects::Ptr robot_obj =
        std::dynamic_pointer_cast<CSetOfObjects>(obj);
    robot_obj->setPose(p);

    m_win->unlockAccess3DScene();
    m_win->forceRepaint();

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::initEstimatedTrajectoryVisualization()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::opengl;

    // SetOfLines
    CSetOfLines::Ptr estimated_traj_setoflines =
        std::make_shared<CSetOfLines>();
    estimated_traj_setoflines->setColor_u8(m_estimated_traj_color);
    estimated_traj_setoflines->setLineWidth(1.5);
    estimated_traj_setoflines->setName("estimated_traj_setoflines");
    // append a dummy line so that you can later use append using
    // CSetOfLines::appendLienStrip method.
    estimated_traj_setoflines->appendLine(
        /* 1st */ 0, 0, 0,
        /* 2nd */ 0, 0, 0);

    // robot model
    // pose_t initial_pose;
    CSetOfObjects::Ptr robot_model = this->setCurrentPositionModel(
        "robot_estimated_traj", m_estimated_traj_color, m_robot_model_size);

    // insert objects in the graph
    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();
    if (m_visualize_estimated_trajectory)
    {
        scene->insert(estimated_traj_setoflines);
    }
    scene->insert(robot_model);
    m_win->unlockAccess3DScene();

    if (m_visualize_estimated_trajectory)
    {
        m_win_manager->assignTextMessageParameters(
            &m_offset_y_estimated_traj, &m_text_index_estimated_traj);
        m_win_manager->addTextMessage(
            m_offset_x_left, -m_offset_y_estimated_traj,
            mrpt::format("Estimated trajectory"),
            mrpt::img::TColorf(m_estimated_traj_color),
            m_text_index_estimated_traj);
    }

    m_win->forceRepaint();

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::updateEstimatedTrajectoryVisualization(
    bool full_update)
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    using namespace mrpt::opengl;

    std::lock_guard<std::mutex> graph_lock(m_graph_section);
    ASSERTDEB_(m_graph.nodeCount() != 0);

    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();

    CRenderizable::Ptr obj;
    if (m_visualize_estimated_trajectory)
    {
        // set of lines
        obj = scene->getByName("estimated_traj_setoflines");
        CSetOfLines::Ptr estimated_traj_setoflines =
            std::dynamic_pointer_cast<CSetOfLines>(obj);

        // gather set of nodes for which to append lines - all of the nodes in
        // the graph or just the last inserted..
        std::set<mrpt::graphs::TNodeID> nodes_set;
        {
            if (full_update)
            {
                this->getNodeIDsOfEstimatedTrajectory(&nodes_set);
                estimated_traj_setoflines->clear();
                // dummy way so that I can use appendLineStrip afterwards.
                estimated_traj_setoflines->appendLine(
                    /* 1st */ 0, 0, 0,
                    /* 2nd */ 0, 0, 0);
            }
            else
            {
                nodes_set.insert(m_graph.nodeCount() - 1);
            }
        }
        // append line for each node in the set
        for (unsigned long it : nodes_set)
        {
            mrpt::poses::CPose3D p(m_graph.nodes.at(it));

            estimated_traj_setoflines->appendLineStrip(p.x(), p.y(), p.z());
        }
    }

    // robot model
    // set the robot position to the last recorded pose in the graph
    obj = scene->getByName("robot_estimated_traj");
    CSetOfObjects::Ptr robot_obj =
        std::dynamic_pointer_cast<CSetOfObjects>(obj);
    pose_t curr_estimated_pos = m_graph.nodes[m_graph.nodeCount() - 1];
    robot_obj->setPose(curr_estimated_pos);

    m_win->unlockAccess3DScene();
    m_win->forceRepaint();
    MRPT_END;
}  // end of updateEstimatedTrajectoryVisualization

template <class GRAPH_T>
CGraphSlamEngine<GRAPH_T>::TRGBDInfoFileParams::TRGBDInfoFileParams(
    const std::string& rawlog_fname)
{
    this->setRawlogFile(rawlog_fname);
    this->initTRGBDInfoFileParams();
}
template <class GRAPH_T>
CGraphSlamEngine<GRAPH_T>::TRGBDInfoFileParams::TRGBDInfoFileParams()
{
    this->initTRGBDInfoFileParams();
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::TRGBDInfoFileParams::setRawlogFile(
    const std::string& rawlog_fname)
{
    // get the correct info filename from the rawlog_fname
    std::string dir = mrpt::system::extractFileDirectory(rawlog_fname);
    std::string rawlog_filename = mrpt::system::extractFileName(rawlog_fname);
    std::string name_prefix = "rawlog_";
    std::string name_suffix = "_info.txt";
    info_fname = dir + name_prefix + rawlog_filename + name_suffix;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::TRGBDInfoFileParams::initTRGBDInfoFileParams()
{
    // fields to use
    fields["Overall number of objects"] = "";
    fields["Observations format"] = "";
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::TRGBDInfoFileParams::parseFile()
{
    ASSERT_FILE_EXISTS_(info_fname);
    using namespace std;

    // open file
    mrpt::io::CFileInputStream info_file(info_fname);
    ASSERTDEBMSG_(
        info_file.fileOpenCorrectly(),
        "\nTRGBDInfoFileParams::parseFile: Couldn't open info file\n");

    string curr_line;
    size_t line_cnt = 0;

    // parse until you find an empty line.
    while (true)
    {
        info_file.readLine(curr_line);
        line_cnt++;
        if (curr_line.size() == 0) break;
    }

    // parse the meaningful data
    while (info_file.readLine(curr_line))
    {
        // split current line at ":"
        vector<string> curr_tokens;
        mrpt::system::tokenize(curr_line, ":", curr_tokens);

        ASSERTDEB_EQUAL_(curr_tokens.size(), 2);

        // evaluate the name. if name in info struct then fill the corresponding
        // info struct parameter with the value_part in the file.
        std::string literal_part = mrpt::system::trim(curr_tokens[0]);
        std::string value_part = mrpt::system::trim(curr_tokens[1]);

        for (auto it = fields.begin(); it != fields.end(); ++it)
        {
            if (mrpt::system::strCmpI(it->first, literal_part))
            {
                it->second = value_part;
            }
        }

        line_cnt++;
    }
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::saveGraph(const std::string* fname_in) const
{
    MRPT_START;

    // what's the name of the file to be saved?
    std::string fname;
    if (fname_in)
    {
        fname = *fname_in;
    }
    else
    {
        fname = "output_graph.graph";
    }

    MRPT_LOG_INFO_STREAM(
        "Saving generated graph in VERTEX/EDGE format: " << fname);
    m_graph.saveToTextFile(fname);

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::save3DScene(const std::string* fname_in) const
{
    MRPT_START;
    ASSERTDEBMSG_(
        m_enable_visuals,
        "\nsave3DScene was called even though enable_visuals flag is "
        "off.\nExiting...\n");
    using namespace mrpt::opengl;

    COpenGLScene::Ptr scene = m_win->get3DSceneAndLock();

    if (!scene)
    {
        MRPT_LOG_ERROR_STREAM(
            "Could not fetch 3D Scene. Display window must already be closed.");
        return;
    }

    // TODO - what else is there to be excluded from the scene?
    // remove the CPlanarLaserScan if it exists
    {
        CPlanarLaserScan::Ptr laser_scan;
        for (; (laser_scan = scene->getByClass<CPlanarLaserScan>());)
        {
            MRPT_LOG_DEBUG_STREAM(
                "Removing CPlanarLaserScan from generated 3DScene...");
            scene->removeObject(laser_scan);
        }
    }

    // what's the name of the file to be saved?
    std::string fname;
    if (fname_in)
    {
        fname = *fname_in;
    }
    else
    {
        fname = "output_scene.3DScene";
    }

    MRPT_LOG_INFO_STREAM("Saving generated scene to " << fname);
    scene->saveToFile(fname);

    m_win->unlockAccess3DScene();
    m_win->forceRepaint();

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::computeSlamMetric(
    mrpt::graphs::TNodeID nodeID, size_t gt_index)
{
    MRPT_START;
    using namespace mrpt::math;
    using namespace mrpt::poses;

    // start updating the metric after a certain number of nodes have been added
    if (m_graph.nodeCount() < 4)
    {
        return;
    }

    // add to the map - keep track of which gt index corresponds to which nodeID
    m_nodeID_to_gt_indices[nodeID] = gt_index;

    // initialize the loop variables only once
    pose_t curr_node_pos;
    pose_t curr_gt_pos;
    pose_t node_delta_pos;
    pose_t gt_delta;
    double trans_diff = 0;
    double rot_diff = 0;

    size_t indices_size = m_nodeID_to_gt_indices.size();

    // recompute the metric from scratch
    m_curr_deformation_energy = 0;

    // first element of map
    auto start_it = m_nodeID_to_gt_indices.begin();
    start_it++;

    // fetch the first node, gt positions separately
    auto prev_it = start_it;
    prev_it--;
    pose_t prev_node_pos = m_graph.nodes[prev_it->first];
    pose_t prev_gt_pos = m_GT_poses[prev_it->second];

    // temporary constraint type
    constraint_t c;

    for (auto index_it = start_it; index_it != m_nodeID_to_gt_indices.end();
         index_it++)
    {
        curr_node_pos = m_graph.nodes[index_it->first];
        curr_gt_pos = m_GT_poses[index_it->second];

        node_delta_pos = curr_node_pos - prev_node_pos;
        gt_delta = curr_gt_pos - prev_gt_pos;

        trans_diff = gt_delta.distanceTo(node_delta_pos);
        rot_diff = this->accumulateAngleDiffs(gt_delta, node_delta_pos);

        m_curr_deformation_energy += (pow(trans_diff, 2) + pow(rot_diff, 2));
        m_curr_deformation_energy /= indices_size;

        // add it to the overall vector
        m_deformation_energy_vec.push_back(m_curr_deformation_energy);

        prev_node_pos = curr_node_pos;
        prev_gt_pos = curr_gt_pos;
    }

    MRPT_LOG_DEBUG_STREAM(
        "Total deformation energy: " << m_curr_deformation_energy);

    MRPT_END;
}

template <class GRAPH_T>
double CGraphSlamEngine<GRAPH_T>::accumulateAngleDiffs(
    const mrpt::poses::CPose2D& p1, const mrpt::poses::CPose2D& p2)
{
    return mrpt::math::wrapToPi(p1.phi() - p2.phi());
}
template <class GRAPH_T>
double CGraphSlamEngine<GRAPH_T>::accumulateAngleDiffs(
    const mrpt::poses::CPose3D& p1, const mrpt::poses::CPose3D& p2)
{
    using mrpt::math::wrapToPi;
    double res = 0;

    res += wrapToPi(p1.roll() - p2.roll());
    res += wrapToPi(p1.pitch() - p2.pitch());
    res += wrapToPi(p1.yaw() - p2.yaw());

    return res;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::initSlamMetricVisualization()
{
    ASSERTDEB_(m_enable_visuals);

    MRPT_START;
    MRPT_LOG_DEBUG_STREAM("In initializeSlamMetricVisualization...");
    ASSERTDEB_(m_visualize_SLAM_metric);

    // initialize the m_win_plot on the stack
    m_win_plot = std::make_unique<mrpt::gui::CDisplayWindowPlots>(
        "Evolution of SLAM metric - Deformation Energy (1:1000)", 400, 300);

    m_win_plot->setPos(20, 50);
    m_win_plot->clf();
    // just plot the deformation points from scratch every time
    m_win_plot->hold_off();
    m_win_plot->enableMousePanZoom(true);

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::updateSlamMetricVisualization()
{
    MRPT_START;
    ASSERTDEB_(m_enable_visuals);
    ASSERTDEB_(m_win_plot && m_visualize_SLAM_metric);

    // build the X, Y vectors for plotting - use log scale
    std::vector<double> x(m_deformation_energy_vec.size(), 0);
    std::vector<double> y(m_deformation_energy_vec.size(), 0);
    for (size_t i = 0; i != x.size(); i++)
    {
        x[i] = i;
        y[i] = m_deformation_energy_vec[i] * 1000;
    }

    m_win_plot->plot(x, y, "r-1", "Deformation Energy (x1000)");

    // set the limits so that he y-values can be monitored
    // set the xmin limit with respect to xmax, which is constantly growing
    std::vector<double>::const_iterator xmax, ymax;
    xmax = std::max_element(x.begin(), x.end());
    ymax = std::max_element(y.begin(), y.end());

    m_win_plot->axis(
        /*x_min = */ xmax != x.end() ? -(*xmax / 12) : -1,
        /*x_max = */ (xmax != x.end() ? *xmax : 1),
        /*y_min = */ -0.4f,
        /*y_max = */ (ymax != y.end() ? *ymax : 1));

    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::getDescriptiveReport(
    std::string* report_str) const
{
    MRPT_START;
    using namespace std;

    // Summary of Results
    stringstream results_ss;
    results_ss << "Summary: " << std::endl;
    results_ss << this->header_sep << std::endl;
    results_ss << "\tProcessing time: "
               << m_time_logger.getMeanTime("proc_time") << std::endl;
    ;
    results_ss << "\tDataset Grab time: " << m_dataset_grab_time << std::endl;
    results_ss << "\tReal-time capable: "
               << (m_time_logger.getMeanTime("proc_time") < m_dataset_grab_time
                       ? "TRUE"
                       : "FALSE")
               << std::endl;
    results_ss << m_edge_counter.getAsString();
    results_ss << "\tNum of Nodes: " << m_graph.nodeCount() << std::endl;
    ;

    // Class configuration parameters
    std::string config_params = this->getParamsAsString();

    // time and output logging
    const std::string time_res = m_time_logger.getStatsAsText();
    const std::string output_res = this->getLogAsString();

    // merge the individual reports
    report_str->clear();

    *report_str += results_ss.str();
    *report_str += this->report_sep;

    *report_str += config_params;
    *report_str += this->report_sep;

    *report_str += time_res;
    *report_str += this->report_sep;

    *report_str += output_res;
    *report_str += this->report_sep;

    MRPT_END;
}

template <class GRAPH_T>
bool CGraphSlamEngine<GRAPH_T>::getGraphSlamStats(
    std::map<std::string, int>* node_stats,
    std::map<std::string, int>* edge_stats, mrpt::system::TTimeStamp* timestamp)
{
    MRPT_START;
    using namespace std;
    using namespace mrpt::graphslam::detail;

    ASSERTDEBMSG_(node_stats, "Invalid pointer to node_stats is given");
    ASSERTDEBMSG_(edge_stats, "Invalid pointer to edge_stats is given");

    if (m_nodeID_max == 0)
    {
        return false;
    }

    // fill the node stats
    (*node_stats)["nodes_total"] = m_nodeID_max + 1;

    // fill the edge stats
    for (auto it = m_edge_counter.cbegin(); it != m_edge_counter.cend(); ++it)
    {
        (*edge_stats)[it->first] = it->second;
    }

    (*edge_stats)["loop_closures"] = m_edge_counter.getLoopClosureEdges();
    (*edge_stats)["edges_total"] = m_edge_counter.getTotalNumOfEdges();

    // fill the timestamp
    if (timestamp)
    {
        *timestamp = m_curr_timestamp;
    }

    return true;
    MRPT_END;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::generateReportFiles(
    const std::string& output_dir_fname)
{
    MRPT_START;
    using namespace mrpt::system;
    using namespace mrpt;

    ASSERTDEBMSG_(
        directoryExists(output_dir_fname),
        format(
            "Output directory \"%s\" doesn't exist", output_dir_fname.c_str()));

    MRPT_LOG_INFO_STREAM("Generating detailed class report...");
    std::lock_guard<std::mutex> graph_lock(m_graph_section);

    std::string report_str;
    std::string fname;
    const std::string ext = ".log";

    {  // CGraphSlamEngine
        report_str.clear();
        fname = output_dir_fname + "/" + m_class_name + ext;
        // initialize the output file - refer to the stream through the
        // m_out_streams map
        this->initResultsFile(fname);
        this->getDescriptiveReport(&report_str);
        m_out_streams[fname].printf("%s", report_str.c_str());

        // write the timings into a separate file
        const std::string time_res = m_time_logger.getStatsAsText();
        fname = output_dir_fname + "/" + "timings" + ext;
        this->initResultsFile(fname);
        m_out_streams[fname].printf("%s", time_res.c_str());
    }
    {  // node_registrar
        report_str.clear();
        fname = output_dir_fname + "/" + "node_registrar" + ext;
        this->initResultsFile(fname);
        m_node_reg->getDescriptiveReport(&report_str);
        m_out_streams[fname].printf("%s", report_str.c_str());
    }
    {  // edge_registrar
        report_str.clear();
        fname = output_dir_fname + "/" + "edge_registrar" + ext;
        this->initResultsFile(fname);
        m_edge_reg->getDescriptiveReport(&report_str);
        m_out_streams[fname].printf("%s", report_str.c_str());
    }
    {  // optimizer
        report_str.clear();
        fname = output_dir_fname + "/" + "optimizer" + ext;
        this->initResultsFile(fname);
        m_optimizer->getDescriptiveReport(&report_str);
        m_out_streams[fname].printf("%s", report_str.c_str());
    }

    if (m_use_GT)
    {  // slam evaluation metric
        report_str.clear();
        const std::string desc(
            "# File includes the evolution of the SLAM metric.  Implemented "
            "metric computes the \"deformation energy\" that is needed to "
            "transfer the estimated trajectory into the ground-truth "
            "trajectory (computed as sum of the difference between estimated "
            "trajectory and ground truth consecutive poses See \"A comparison "
            "of SLAM algorithms based on a graph of relations - W.Burgard et "
            "al.\", for more details on the metric.\n");

        fname = output_dir_fname + "/" + "SLAM_evaluation_metric" + ext;
        this->initResultsFile(fname);

        m_out_streams[fname].printf("%s\n", desc.c_str());
        for (auto vec_it = m_deformation_energy_vec.begin();
             vec_it != m_deformation_energy_vec.end(); ++vec_it)
        {
            m_out_streams[fname].printf("%f\n", *vec_it);
        }
    }

    MRPT_END;
}
template <class GRAPH_T>
mrpt::opengl::CSetOfObjects::Ptr
    CGraphSlamEngine<GRAPH_T>::setCurrentPositionModel(
        const std::string& model_name, const mrpt::img::TColor& model_color,
        const size_t model_size, const pose_t& init_pose)
{
    mrpt::opengl::CSetOfObjects::Ptr model =
        this->initRobotModelVisualization();
    model->setName(model_name);
    model->setColor_u8(model_color);
    model->setScale(model_size);
    model->setPose(init_pose);

    return model;
}

template <class GRAPH_T>
void CGraphSlamEngine<GRAPH_T>::getDeformationEnergyVector(
    std::vector<double>* vec_out) const
{
    *vec_out = m_deformation_energy_vec;
}
}  // namespace mrpt::graphslam