Physics.h

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// File: Physics.h
// Description: Component that handles kinematics of the object. Updates its position + rotation every frame
// Author(s): Ori Balashov (ori.balashov@digipen.edu)
// 2025 / 09 / 22
// (C) Digipen 2025
//   ____   __                  __  __
// /\__  _\/\ \                /\ \/\ \
// \/_/\ \/\ \ \___      __    \ \ \_\ \    ___   __  __    ____     __
//    \ \ \ \ \  _ `\  /'__`\   \ \  _  \  / __`\/\ \/\ \  /',__\  /'__`\
//     \ \ \ \ \ \ \ \/\  __/    \ \ \ \ \/\ \L\ \ \ \_\ \/\__, `\/\  __/
//      \ \_\ \ \_\ \_\ \____\    \ \_\ \_\ \____/\ \____/\/\____/\ \____\
//       \/_/  \/_/\/_/\/____/     \/_/\/_/\/___/  \/___/  \/___/  \/____/
#pragma once
 
#include "Framework/Component.h"
#include "Utility/Math/Vector4D.h"
 
 
// This class is partly inspired by the physics component Doug Schilling's 230 Engine
class Physics : public Component
{
public:
    Physics();
    Physics(const Physics& p)                    = default;
    auto operator=(const Physics& p) -> Physics& = default;
 
    auto clone() const -> std::unique_ptr<GameObject> override;
 
    auto componentShowMenu() -> void override;; // for debug ImGUI
    // This function is the most inspired by Doug Schilling's engine
    auto onUpdate(float dt) -> void override;
 
    auto endWindow() -> void override
    {
    }; // for debug ImGUI
 
    auto onRender() -> void override;
    auto load(Stream& stream) -> void override;
    auto save(Stream& stream) const -> void override;
 
    auto acceleration(const Vector4D& acceleration) -> void;
    auto acceleration(void) const -> const Vector4D&;
 
    auto prevTranslation(const Vector4D& oldTranslation) -> void;
    auto prevTranslation(void) const -> const Vector4D&;
 
    auto velocity(const Vector4D& velocity) -> void;
    auto velocity(void) const -> const Vector4D&;
 
    auto rotationalVelocity(float rotationalVelocity) -> void;
    auto rotationalVelocity(void) const -> float;

    friend auto to_json(json& j, const Physics& p) -> void;
    friend auto from_json(const json& j, Physics& p) -> void;
    friend struct nlohmann::adl_serializer<Physics>;
 
private:
    // These variables are heavily influenced by Doug Schilling's 230 Engine
 
    // Acceleration = inverseMass * (sum of forces)
    Vector4D _acceleration;
    // Previous position
    Vector4D _prevTranslation;
    Vector4D _velocity;
    // How fast the object is rotating, stored in degrees
    float _rotationalVelocity;
};