Program Listing for File Gravity.h

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/**
 * @file
 * @brief Contains the declarations for the Gravity KModel.
 */

#pragma once
#include "Karana/GeneralKModels/GravityInterface.h"
#include "Karana/SOADyn/KModel.h"

namespace Karana::Models {

    namespace km = Karana::Math;
    namespace kd = Karana::Dynamics;

    /**
     * @class Gravity
     * @brief Apply uniform gravitational acceleration to each body in the provided multibody.
     */
    class Gravity : public KModel<Gravity> {
      public:
        /**
         * @brief Gravity constructor. The constructor is not meant to be called directly.
         *        Please use the create(...) method instead to create an instance.
         *
         * @param name The name of the model.
         * @param mm The ModelManager to register this model with.
         * @param gravity_interface The GravityInterface used to compute gravity.
         * @param st The SubTree to apply uniform gravity to.
         */
        Gravity(std::string_view name,
                const kc::ks_ptr<kd::ModelManager> &mm,
                const kc::ks_ptr<GravityInterface> gravity_interface,
                const kc::ks_ptr<kd::SubTree> &st);

        /**
         * @brief Destructor for Gravity.
         */
        ~Gravity();

        /**
         * @brief Constructor.
         *
         * @param name The name of the model.
         * @param mm The ModelManager to register this model with.
         * @param gravity_interface The GravityInterface used to compute gravity.
         * @param st The SubTree to apply uniform gravity to.
         * @return A ks_ptr to the newly created instance of the Gravity model.
         */
        static kc::ks_ptr<Gravity> create(std::string_view name,
                                          const kc::ks_ptr<kd::ModelManager> &mm,
                                          const kc::ks_ptr<GravityInterface> gravity_interface,
                                          const kc::ks_ptr<kd::SubTree> &st);

        /**
         * @brief Calculate and apply the aerodynamic force.
         *
         * @param t Current time.
         * @param x Current state. Not used.
         */
        void preDeriv(const km::Ktime &t, const km::Vec &x);

        /**
         * @brief Get the gravity interface used by this KModel.
         *
         * @returns The gravity interface used by this KModel.
         */
        const kc::ks_ptr<GravityInterface> &getGravityInterface() const;

        /**
         * @brief Used to ensure this Gravity model is ready.
         *
         * @return `true` if this is ready, `false` otherwise.
         */
        bool isReady() const override;

        /**
         * @brief Return a formatted string containing information about this object.
         * @param prefix String prefix to use for formatting.
         * @param options Dump options (if null, defaults will be used).
         * @return A string representation of the object.
         */
        std::string dumpString(std::string_view prefix = "",
                               const Base::DumpOptions *options = nullptr) const override;

      private:
        /// The node that we use to calculate and apply the forces.
        kc::ks_ptr<kd::SubTree> _st;

        /// The gravity interface used to communicate with others
        kc::ks_ptr<GravityInterface> _gravity_interface;
    };
} // namespace Karana::Models