std::string ease2String(Tween::EASE ease)
{
#define STRINGIFY(x) #x
#define S(x) STRINGIFY(x)
switch (ease)
{
case Tween::ease_linear:
return "linear";
#define DEF_EASY_FROM_IN(EasyPost) \
case Tween::ease_in ## EasyPost: \
return "in" S(EasyPost);\
case Tween::ease_out ## EasyPost: \
return "out" S(EasyPost); \
case Tween::ease_inOut ## EasyPost: \
return "inOut" S(EasyPost); \
case Tween::ease_outIn ## EasyPost: \
return "outIn" S(EasyPost);
DEF_EASY_FROM_IN(Quad);
DEF_EASY_FROM_IN(Cubic);
DEF_EASY_FROM_IN(Quart);
DEF_EASY_FROM_IN(Quint);
DEF_EASY_FROM_IN(Sin);
DEF_EASY_FROM_IN(Expo);
DEF_EASY_FROM_IN(Circ);
DEF_EASY_FROM_IN(Back);
DEF_EASY_FROM_IN(Bounce);
}
return "unknown";
}
float Tween::calcEase(EASE ease, float t)
{
const float s = 1.70158f;
switch (ease)
{
case ease_linear:
return t;
#define DEF_EASY_FROM_IN(EasyPost, formula) \
case ease_in ## EasyPost: \
return (formula); \
case ease_out ## EasyPost: \
return 1 - calcEase(ease_in ## EasyPost, 1 - t); \
case ease_inOut ## EasyPost: \
return t <= 0.5f ? calcEase(ease_in ## EasyPost, t * 2) / 2 : 1 - calcEase(ease_in ## EasyPost, 2 - t * 2) / 2; \
case ease_outIn ## EasyPost: \
return t <= 0.5f ? calcEase(ease_in ## EasyPost, t * 2) / 2 : 1 - calcEase(ease_in ## EasyPost, 2 - t * 2) / 2; \
DEF_EASY_FROM_IN(Quad, t * t);
DEF_EASY_FROM_IN(Cubic, t * t * t);
DEF_EASY_FROM_IN(Quart, powf(t, 4));
DEF_EASY_FROM_IN(Quint, powf(t, 5));
DEF_EASY_FROM_IN(Sin, 1.0f - scalar::cos(t * (MATH_PI / 2.0f)));
DEF_EASY_FROM_IN(Expo, powf(2, 10 * (t - 1)));
DEF_EASY_FROM_IN(Circ, -1.0f * (sqrt(1 - t * t) - 1));
DEF_EASY_FROM_IN(Back, t * t * ((s + 1) * t - s));
DEF_EASY_FROM_IN(Bounce, 1 - outBounce(1 - t));
default:
t = _customEaseHandler(ease, t);
//OX_ASSERT(!"unsupported ease");
break;
}
#undef DEF_EASY_FROM_IN
return t;
}
