easing.h

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#ifndef ASW_EASING_H
#define ASW_EASING_H
 
#include <algorithm>
#include <cmath>
 
namespace asw::easing {
  using EaseFunc = float (*)(float);
 
  // --- Linear ---
  float linear(float t);
 
  // --- Quadratic ---
  float easeInQuad(float t);
  float easeOutQuad(float t);
  float easeInOutQuad(float t);
 
  // --- Cubic ---
  float easeInCubic(float t);
  float easeOutCubic(float t);
  float easeInOutCubic(float t);
 
  // --- Sine ---
  float easeInSine(float t);
  float easeOutSine(float t);
  float easeInOutSine(float t);
 
  // --- Exponential ---
  float easeInExpo(float t);
  float easeOutExpo(float t);
  float easeInOutExpo(float t);
 
  // --- Elastic ---
  float easeInElastic(float t);
  float easeOutElastic(float t);
 
  // --- Bounce ---
  float easeInBounce(float t);
  float easeOutBounce(float t);
 
  // --- Back (overshoot) ---
  float easeInBack(float t);
  float easeOutBack(float t);
 
  // --- Convenience ---
 
  template <typename T>
  T ease(const T& a, const T& b, float t, EaseFunc func) {
    return a + (b - a) * func(std::clamp(t, 0.0F, 1.0F));
  }
 
}  // namespace asw::easing
 
#endif  // ASW_EASING_H