NAME¶

SDL_atan - Compute the arc tangent of x .

HEADER FILE¶

Defined in SDL3/SDL_stdinc.h

SYNOPSIS¶

#include "SDL3/SDL.h"

double SDL_atan(double x);

DESCRIPTION¶

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.

FUNCTION PARAMETERS¶

x

floating point value.

RETURN VALUE¶

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

AVAILABILITY¶

This function is available since SDL 3.0.0.

SEE ALSO¶

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