Function atan2

src/fl/math/math.h:391–391

// atan2
inline float atan2f(float y, float x) FL_NOEXCEPT { return atan2_impl_float(y, x); }
inline double atan2(double y, double x) FL_NOEXCEPT { return atan2_impl_double(y, x); }
template<typename T> inline typename enable_if<is_integral<T>::value, float>::type
atan2(T y, T x) FL_NOEXCEPT { return atan2_impl_float(static_cast<float>(y), static_cast<float>(x)); }