AnimationEquations.h

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*
*      Copyright (c) 2009-2012 Hewlett-Packard Development Company, L.P.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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#ifndef ANIMATIONEQUATIONS_H
#define ANIMATIONEQUATIONS_H

#include "Common.h"

typedef int PValue;

class AnimationEquations
{
public:

        enum Type {
                EaseLinear,
                EaseIn,
                EaseOut,
                EaseInOut
        };

        static PValue easeLinear(PValue time, PValue initial, PValue final, PValue duration, PValue strength) {
                time = time / duration;
                return initial + (final - initial) * time;
        }

        static PValue easeInQuad(PValue time, PValue initial, PValue final, PValue duration, PValue strength) {
                time = time / duration;
                return initial + (final - initial) * (time * time);
        }

        static PValue easeInCubic(PValue time, PValue initial, PValue final, PValue duration, PValue strength) {
                time = time / duration;
                return initial + (final - initial) * (time * time * time);
        }

        static PValue easeInQuat(PValue time, PValue initial, PValue final, PValue duration, PValue strength) {
                time = time / duration;
                return initial + (final - initial) * (time * time * time * time);
        }

        static PValue easeInGeneric(PValue time, PValue initial, PValue final, PValue duration, PValue strength) {
                time = time / duration;
                return initial + (final - initial) * (time ^ (strength / 10));
        }
        
        static PValue easeOutQuad(PValue time, PValue initial, PValue final, PValue duration, PValue strength) {
                time = PValue(1) - time / duration;
                return initial + (final - initial) * (PValue(1) - time * time);
        }

        static PValue easeOutCubic(PValue time, PValue initial, PValue final, PValue duration, PValue strength) {
                time = PValue(1) - time / duration;
                return initial + (final - initial) * (PValue(1) - time * time * time);
        }

        static PValue easeOutQuat(PValue time, PValue initial, PValue final, PValue duration, PValue strength) {
                time = PValue(1) - time / duration;
                return initial + (final - initial) * (PValue(1) - time * time * time * time);
        }

        static PValue easeOutGeneric(PValue time, PValue initial, PValue final, PValue duration, PValue strength) {
                time = PValue(1) - time / duration;
                return initial + (final - initial) * (PValue(1) - (time ^ (strength / 10)));
        }
};

typedef PValue (*AnimationEquation)(PValue time, PValue initial, PValue final, PValue duration, PValue strength);


#endif /* ANIMATIONEQUATIONS_H */