SDL_atan2 - Compute the arc tangent of y/x , using the signs of x and y to adjust the result's quadrant.

       This function is available since SDL 3.2.0.

       The definition of z=atan2(x,y) is y=xtan(z) , where the quadrant of z is determined based on the signs of
       x and y.

       Domain:  -INF<=x<=INF  ,  -INF<=y<=INF  Range:  -Pi/2<=y<=Pi/2 This function operates on double-precision
       floating point values, use

       SDL_atan2f
        for single-precision floats.

       To calculate the arc tangent of a single value, use SDL_atan .

       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.

y      floating point value of the numerator (y coordinate).

       x      floating point value of the denominator (x coordinate).

       Defined in SDL3/SDL_stdinc.h

       SDL_atan2 - Compute the arc tangent of y/x , using the signs of x and y to adjust the result's quadrant.

       Returns arc tangent of of y/x in radians, or, if x=0 , either -Pi/2 , 0 , or  Pi/2  ,  depending  on  the
       value of y .

•(3), SDL_atan2f(3), •(3), SDL_atan(3), •(3), SDL_tan(3)

Simple Directmedia Layer                           SDL 3.2.10                                       SDL_atan2(3)

#include"SDL3/SDL.h"doubleSDL_atan2(doubley,doublex);

       It is safe to call this function from any thread.