(This is the documentation for SDL3, which is the current stable version. SDL2 was the previous version!)

SDL_atanf

Compute the arc tangent of x.

Header File

Syntax

float SDL_atanf(float x);

Function Parameters

float

floating point value.

Return Value

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

Remarks

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

Domain: -INF <= x <= INF

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

This function operates on single-precision floating point values, use SDL_atan for dboule-precision floats.

To calculate the arc tangent of y / x, use SDL_atan2f.

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.

Thread Safety

It is safe to call this function from any thread.

Version

This function is available since SDL 3.1.3.