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//
// easing.h
//
// Copyright (c) 2011, Auerhaus Development, LLC
//
// This program is free software. It comes without any warranty, to
// the extent permitted by applicable law. You can redistribute it
// and/or modify it under the terms of the Do What The Fuck You Want
// To Public License, Version 2, as published by Sam Hocevar. See
// http://sam.zoy.org/wtfpl/COPYING for more details.
//
#ifndef AH_EASING_H
#define AH_EASING_H
#if defined(__LP64__) && !defined(AH_EASING_USE_DBL_PRECIS)
#define AH_EASING_USE_DBL_PRECIS
#endif
#ifdef AH_EASING_USE_DBL_PRECIS
#define AH_FLOAT_TYPE float
#else
#define AH_FLOAT_TYPE float
#endif
typedef AH_FLOAT_TYPE AHFloat;
#if defined __cplusplus
extern "C" {
#endif
#ifndef M_PI
#define M_PI 3.14159265358979323846 /* pi */
#endif
#ifndef M_PI_2
#define M_PI_2 1.57079632679489661923 /* pi/2 */
#endif
typedef AHFloat (*AHEasingFunction)(AHFloat);
// Linear interpolation (no easing)
AHFloat LinearInterpolation(AHFloat p);
// Quadratic easing; p^2
AHFloat QuadraticEaseIn(AHFloat p);
AHFloat QuadraticEaseOut(AHFloat p);
AHFloat QuadraticEaseInOut(AHFloat p);
// Cubic easing; p^3
AHFloat CubicEaseIn(AHFloat p);
AHFloat CubicEaseOut(AHFloat p);
AHFloat CubicEaseInOut(AHFloat p);
// Quartic easing; p^4
AHFloat QuarticEaseIn(AHFloat p);
AHFloat QuarticEaseOut(AHFloat p);
AHFloat QuarticEaseInOut(AHFloat p);
// Quintic easing; p^5
AHFloat QuinticEaseIn(AHFloat p);
AHFloat QuinticEaseOut(AHFloat p);
AHFloat QuinticEaseInOut(AHFloat p);
// Sine wave easing; sin(p * PI/2)
AHFloat SineEaseIn(AHFloat p);
AHFloat SineEaseOut(AHFloat p);
AHFloat SineEaseInOut(AHFloat p);
// Circular easing; sqrt(1 - p^2)
AHFloat CircularEaseIn(AHFloat p);
AHFloat CircularEaseOut(AHFloat p);
AHFloat CircularEaseInOut(AHFloat p);
// Exponential easing, base 2
AHFloat ExponentialEaseIn(AHFloat p);
AHFloat ExponentialEaseOut(AHFloat p);
AHFloat ExponentialEaseInOut(AHFloat p);
// Exponentially-damped sine wave easing
AHFloat ElasticEaseIn(AHFloat p);
AHFloat ElasticEaseOut(AHFloat p);
AHFloat ElasticEaseInOut(AHFloat p);
// Overshooting cubic easing;
AHFloat BackEaseIn(AHFloat p);
AHFloat BackEaseOut(AHFloat p);
AHFloat BackEaseInOut(AHFloat p);
// Exponentially-decaying bounce easing
AHFloat BounceEaseIn(AHFloat p);
AHFloat BounceEaseOut(AHFloat p);
AHFloat BounceEaseInOut(AHFloat p);
#ifdef __cplusplus
}
#endif
#endif
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