GroundGrid.cpp

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/*+-------------------------------------------------------------------------+
  |                       MultiVehicle simulator (libmvsim)                 |
  |                                                                         |
  | Copyright (C) 2014-2020  Jose Luis Blanco Claraco                       |
  | Copyright (C) 2017  Borys Tymchenko (Odessa Polytechnic University)     |
  | Distributed under 3-clause BSD License                                  |
  |   See COPYING                                                           |
  +-------------------------------------------------------------------------+ */

#include <mvsim/World.h>
#include <mvsim/WorldElements/GroundGrid.h>
#include "xml_utils.h"

#include <mrpt/opengl/COpenGLScene.h>
#include <rapidxml.hpp>

using namespace rapidxml;
using namespace mvsim;
using namespace std;

GroundGrid::GroundGrid(World* parent, const rapidxml::xml_node<char>* root)
        : WorldElementBase(parent),
          m_is_floating(true),
          m_x_min(-25.0),
          m_x_max(25.0),
          m_y_min(-25.0),
          m_y_max(25.0),
          m_interval(5.0),
          m_color(0xe0, 0xe0, 0xe0, 0xff),
          m_line_width(1.0)
{
        // Create opengl object: in this class, we'll store most state data directly
        // in the mrpt::opengl object.
        loadConfigFrom(root);
}

GroundGrid::~GroundGrid() {}
void GroundGrid::loadConfigFrom(const rapidxml::xml_node<char>* root)
{
        if (!root) return;  // Assume defaults

        TParameterDefinitions params;
        params["floating"] = TParamEntry("%bool", &m_is_floating);
        params["floating_focus"] =
                TParamEntry("%s", &m_float_center_at_vehicle_name);
        params["color"] = TParamEntry("%color", &m_color);
        params["line_width"] = TParamEntry("%lf", &m_line_width);

        params["x_min"] = TParamEntry("%lf", &m_x_min);
        params["x_max"] = TParamEntry("%lf", &m_x_max);
        params["y_min"] = TParamEntry("%lf", &m_y_min);
        params["y_max"] = TParamEntry("%lf", &m_y_max);
        params["interval"] = TParamEntry("%lf", &m_interval);

        parse_xmlnode_children_as_param(*root, params);

        // If a vehicle name is given, setting "is_floating=true" by the user is
        // optional:
        if (!m_float_center_at_vehicle_name.empty()) m_is_floating = true;
}

void GroundGrid::internalGuiUpdate(
        mrpt::opengl::COpenGLScene& scene, bool childrenOnly)
{
        using namespace mrpt::math;

        // 1st call OR gridmap changed?
        if (!m_gl_groundgrid)
        {
                m_gl_groundgrid = mrpt::opengl::CGridPlaneXY::Create();
                m_gl_groundgrid->setPlaneLimits(m_x_min, m_x_max, m_y_min, m_y_max);
                m_gl_groundgrid->setGridFrequency(m_interval);
                m_gl_groundgrid->setColor_u8(m_color);
                m_gl_groundgrid->setLineWidth(m_line_width);

                scene.insert(m_gl_groundgrid);
        }

        // Update:
        mrpt::math::TPoint3D center_offset(.0, .0, .0);
        if (m_is_floating)
        {
                // Centered at a vehicle:
                const World::VehicleList& vehs = m_world->getListOfVehicles();
                // Look for the vehicle by its name:
                World::VehicleList::const_iterator it_veh =
                        vehs.find(m_float_center_at_vehicle_name);
                // not found -> error:
                if (!m_float_center_at_vehicle_name.empty() && it_veh == vehs.end())
                        throw std::runtime_error(mrpt::format(
                                "[GroundGrid] *ERROR* Cannot find vehicle named '%s' to "
                                "focus on.",
                                m_float_center_at_vehicle_name.c_str()));

                // If the user didn't specify any name, assume it's the first vehicle,
                // or ignore it if none exists:
                if (it_veh == vehs.end()) it_veh = vehs.begin();

                if (it_veh != vehs.end())
                {
                        const mrpt::math::TPose3D& pose = it_veh->second->getPose();
                        center_offset.x = pose.x;
                        center_offset.y = pose.y;
                }
        }

        // "Discretize" offset for a better visual impact:
        ASSERT_(m_interval > .0);
        center_offset.x = m_interval *
                                          ::floor(std::abs(center_offset.x) / m_interval) *
                                          (center_offset.x < 0 ? -1. : 1.);
        center_offset.y = m_interval *
                                          ::floor(std::abs(center_offset.y) / m_interval) *
                                          (center_offset.y < 0 ? -1. : 1.);
        m_gl_groundgrid->setLocation(center_offset);
}