SDL_atan - Man Page

#include <SDL3/SDL_stdinc.h>

double SDL_atan(double x);

The definition of y = atan(x) is x = tan(y).

Domain: -INF <= x <= INF

Range: -Pi/2 <= y <= Pi/2

This function operates on double-precision floating point values, use SDL_atanf for single-precision floats.

To calculate the arc tangent of y / x, use SDL_atan2.

This function may use a different approximation across different versions, platforms and configurations. i.e, it can return a different value given the same input on different machines or operating systems, or if SDL is updated.

x

floating point value.

Returns arc tangent of of x in radians, or 0 if x = 0.

It is safe to call this function from any thread.

This function is available since SDL 3.2.0.

SDL_atanf(3), SDL_atan2(3), SDL_tan(3)

SDL_atan2(3), SDL_atan2f(3), SDL_atanf(3), SDL_tan(3).