SDL_atan3
Compute the arc tangent of x .
Usage
#include "SDL3/SDL.h"
double SDL_atan(double x);
Header file
Defined in SDL3/SDL_stdinc.h
Overview
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 .
Thread safety
It is safe to call this function from any thread.