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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.


CategoryAPI, CategoryStandard, CategoryDraft


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