Man page - sdl_atan2(3)

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Manual

SDL_atan2

NAME
HEADER FILE
SYNOPSIS
DESCRIPTION
FUNCTION PARAMETERS
RETURN VALUE
THREAD SAFETY
AVAILABILITY
SEE ALSO

NAME

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

HEADER FILE

Defined in SDL3/SDL_stdinc.h

SYNOPSIS

#include "SDL3/SDL.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/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.

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.