NAME

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

SYNOPSIS

       #include <SDL3/SDL_stdinc.h>

       double SDL_atan2(double y, double x);

DESCRIPTION

       The  definition  of  z  = atan2(x, y) is y = x tan(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 <= y <= Pi

       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.

FUNCTION PARAMETERS

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

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

RETURN VALUE

       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.

THREAD SAFETY

       It is safe to call this function from any thread.

AVAILABILITY

       This function is available since SDL 3.2.0.

SEE ALSO

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

Simple Directmedia Layer                           SDL 3.2.20                                       SDL_atan2(3)