.. _program_listing_file_simulations_world.h:

Program Listing for File world.h
================================

|exhale_lsh| :ref:`Return to documentation for file <file_simulations_world.h>` (``simulations/world.h``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #pragma once
   
   #include <string>
   
   #include "lupnt/core/config.h"
   #include "lupnt/core/definitions.h"
   #include "lupnt/core/object.h"
   #include "lupnt/interfaces/lola_dem.h"
   #include "lupnt/states/state.h"
   
   namespace lupnt {
   
     class Simulation;
     class NBodyDynamics;
   
     class World : public Object<World> {
     public:
       World() = default;
   
       explicit World(Config& world_config);
   
       void SetSimulation(Simulation* sim) { sim_ = sim; }
   
       Real GetEpoch() const { return epoch_; }
       Frame GetFrame() const { return frame_; }
       const Config& GetForceModel() const { return force_model_; }
       bool HasForceModel() const { return has_force_model_; }
   
       Ptr<NBodyDynamics> MakeDynamics() const;
   
       Ptr<NBodyDynamics> MakeDynamics(double cr, double area_m2, double mass_kg) const;
   
       Ptr<NBodyDynamics> MakeTruthDynamics() const;
   
       const Config& GetPlasma() const { return plasma_; }
       bool HasPlasma() const { return has_plasma_; }
   
       double GetGM() const { return gm_; }
       Vec3d Gravity(const Vec3d& r) const;
   
       bool HasTerrain() const { return has_dem_; }
       const LunarDem& GetDem() const { return dem_; }
       double GetElevation(double east_m, double north_m) const;
       Vec3d EnuToWorld(double east_m, double north_m, double up_m) const;
       const Mat3d& REnuToWorld() const { return R_enu2world_; }
       const Vec3d& SiteCenterWorld() const { return r_center_world_; }
       double SiteLatDeg() const { return site_lat_deg_; }
       double SiteLonDeg() const { return site_lon_deg_; }
   
       Cart6 GetStateAt(const std::string& agent_name, Real t) const;
   
     private:
       Simulation* sim_ = nullptr;
       Real epoch_ = 0.0;
       Frame frame_ = Frame::MOON_CI;
   
       // Orbital force model.
       bool has_force_model_ = false;
       Config force_model_;  // NBodyDynamics-style force-model block
   
       // Ionosphere/plasmasphere signal-delay environment (shared truth property).
       bool has_plasma_ = false;
       Config plasma_;  // `plasma:` block; schema consumed by the GNSS ODTS app
   
       // Point-mass gravity (surface INS).
       double gm_ = 0.0;  // set from `gravity.body` (default MOON) in the constructor
   
       // Terrain / DEM (surface scenarios).
       bool has_dem_ = false;
       LunarDem dem_;
       double dem_cx_ = 0.0, dem_cy_ = 0.0;     // DEM native center coords
       Vec3d r_center_world_ = Vec3d::Zero();   // ENU origin in the world frame
       Mat3d R_enu2world_ = Mat3d::Identity();  // ENU -> world rotation
       double site_lat_deg_ = 0.0, site_lon_deg_ = 0.0;
     };
   
   }  // namespace lupnt