GamePhysics.h

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#pragma once

#include "stdafx.h"
#include <iostream>
#include <memory>
#include "MyUtils.h"

#define GRAVITY 98.1f

class GamePhysics
{
private:
protected:
    struct ProjectileObject
    {
        Ogre::Vector3 displacement;
        Ogre::Vector3 initalVelocity;
        Ogre::Vector3 velocity;
        Ogre::Real acceleration;
        Ogre::Real time;

        ProjectileObject(Ogre::Vector3 initalVelocity)
        {
            /*initialise the variables*/
            this->initalVelocity = velocity = initalVelocity;
            acceleration = -GRAVITY;
            time = 0.0f;
            displacement = 0.0f;
        }

        ProjectileObject(Ogre::Real initalXVelocity, Ogre::Real initalYVelocity, Ogre::Real initalZVelocity)
        {
            /*initialise the variables*/
            this->initalVelocity = velocity = Ogre::Vector3(initalXVelocity, initalYVelocity, initalZVelocity);
            acceleration = -GRAVITY;
            time = 0.0f;
            displacement = 0.0f;
        }
    };

    std::shared_ptr<ProjectileObject> projectile;

public:
    GamePhysics();

    ~GamePhysics();

    void updateProjectile(float dt);

    Ogre::Vector3 getProjectileDisplacement();

    Ogre::Real getVfromUAT(Ogre::Real u, Ogre::Real a, Ogre::Real t);

    Ogre::Real getSfromUAT(Ogre::Real u, Ogre::Real a, Ogre::Real t);

    Ogre::Real getSfromUVT(Ogre::Real u, Ogre::Real v, Ogre::Real t);

    Ogre::Real getVSquaredfromUAS(Ogre::Real u, Ogre::Real a, Ogre::Real s);

    Ogre::Real getSfromVAT(Ogre::Real v, Ogre::Real a, Ogre::Real t);

    bool collisionTest(Ogre::Vector3 position, Ogre::Vector3 testPosition);
};