DRAFT |
SDL_acos
Use this function to compute arc cosine of x.
Syntax
double SDL_acos(double x)
Function Parameters
x |
floating point value, in radians |
Return Value
Returns arc cosine of x.
Code Examples
/* acos(x) = Pi/2 - asin(x) */
SDL_Log("acos(0):\t\t%f", SDL_acos(0));
SDL_Log("Pi/2 - asin(0):\t%f", M_PI / 2 - SDL_asin(0));
/* acos(-x) = Pi - acos(x) */
SDL_Log("acos(-(-1)):\t%f", SDL_acos(-(-1)));
SDL_Log("Pi - acos(-1):\t%f", M_PI - SDL_acos(-1));
Remarks
The definition of y = acos(x) is x = cos(y).
Domain: -1 <= x <= 1
Range: 0 <= y <= Pi
Version
This function is available since SDL 2.0.2.
