Affectors.hpp

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//
// Thor C++ Library
// Copyright (c) 2011-2016 Jan Haller
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would be
//    appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not be
//    misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//


#ifndef THOR_AFFECTOR_HPP
#define THOR_AFFECTOR_HPP

#include <Thor/Config.hpp>

#include <SFML/System/Time.hpp>
#include <SFML/System/Vector2.hpp>

#include <functional>


namespace thor
{

class Particle;


template <typename Affector>
std::function<void(Particle&, sf::Time)> refAffector(Affector& referenced)
{
    return [&referenced] (Particle& particle, sf::Time dt)
    {
        return referenced(particle, dt);
    };
}


class THOR_API ForceAffector
{
    // ---------------------------------------------------------------------------------------------------------------------------
    // Public member functions
    public:
        explicit                    ForceAffector(sf::Vector2f acceleration);

        void                        operator() (Particle& particle, sf::Time dt);


    // ---------------------------------------------------------------------------------------------------------------------------
    // Private variables
    private:
        sf::Vector2f                mAcceleration;
};


class THOR_API TorqueAffector
{
    // ---------------------------------------------------------------------------------------------------------------------------
    // Public member functions
    public:
        explicit                    TorqueAffector(float angularAcceleration);

        void                        operator() (Particle& particle, sf::Time dt);


    // ---------------------------------------------------------------------------------------------------------------------------
    // Private variables
    private:
        float                       mAngularAcceleration;
};


class THOR_API ScaleAffector
{
    // ---------------------------------------------------------------------------------------------------------------------------
    // Public member functions
    public:
        explicit                    ScaleAffector(sf::Vector2f scaleFactor);

        void                        operator() (Particle& particle, sf::Time dt);


    // ---------------------------------------------------------------------------------------------------------------------------
    // Private variables
    private:
        sf::Vector2f                mScaleFactor;
};


class THOR_API AnimationAffector
{
    // ---------------------------------------------------------------------------------------------------------------------------
    // Public member functions
    public:
        explicit                    AnimationAffector(std::function<void(Particle&, float)> particleAnimation);

        void                        operator() (Particle& particle, sf::Time dt);


    // ---------------------------------------------------------------------------------------------------------------------------
    // Private variables
    private:
        std::function<void(Particle&, float)>   mAnimation;
};


} // namespace thor

#endif // THOR_AFFECTOR_HPP