FadeAnimation.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_FADEANIMATION_HPP
#define THOR_FADEANIMATION_HPP

#include <Thor/Config.hpp>
#include <Thor/Graphics/UniformAccess.hpp>


namespace thor
{


class THOR_API FadeAnimation
{
    // ---------------------------------------------------------------------------------------------------------------------------
    // Public member functions
    public:
                                    FadeAnimation(float inRatio, float outRatio);

        template <class Animated>
        void                        operator() (Animated& animated, float progress) const;


    // ---------------------------------------------------------------------------------------------------------------------------
    // Private variables
    private:
        float                       mInRatio;
        float                       mOutRatio;
};


// ---------------------------------------------------------------------------------------------------------------------------


template <class Animated>
void FadeAnimation::operator() (Animated& target, float progress) const
{
    if (progress < mInRatio)
        setAlpha(target, static_cast<sf::Uint8>(256 * progress / mInRatio));
    else if (progress > 1.f - mOutRatio)
        setAlpha(target, static_cast<sf::Uint8>(256 * (1.f-progress) / mOutRatio));
}

} // namespace thor

#endif // THOR_FADEANIMATION_HPP