Easing functions C++

30 easing functions implemented in C++.
More info how functions look like and their behaviour on easings.net.

How to use

Include h-file.

#include "easing.h"

After that there are two ways:

1. Just call one of the 30 implemented functions:

    easeInSine( 0.5 );
   

2. Or to make functions calls more unified, you can use the help-function (getEasingFunction) to get the pointer to the needed function and call it:

    auto easingFunction = getEasingFunction( EaseInExpo );
    double progress = easingFunction( 0.5 );	// 0.058
   
    easingFunction = getEasingFunction( EaseOutQuint );
    progress = easingFunction( 0.5 );	//0.968
   

Function that returns needed pointer has the following definition:

typedef double(*easingFunction)(double);
easingFunction getEasingFunction( easing_functions function );

And accept one the enums:

enum easing_functions
{
  EaseInSine,
	EaseOutSine,
	EaseInOutSine,
	EaseInQuad,
	EaseOutQuad,
	EaseInOutQuad,
	EaseInCubic,
	EaseOutCubic,
	EaseInOutCubic,
	EaseInQuart,
	EaseOutQuart,
	EaseInOutQuart,
	EaseInQuint,
	EaseOutQuint,
	EaseInOutQuint,
	EaseInExpo,
	EaseOutExpo,
	EaseInOutExpo,
	EaseInCirc,
	EaseOutCirc,
	EaseInOutCirc,
	EaseInBack,
	EaseOutBack,
	EaseInOutBack,
	EaseInElastic,
	EaseOutElastic,
	EaseInOutElastic,
	EaseInBounce,
	EaseOutBounce,
	EaseInOutBounce
};