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Differences between revisions 5 and 6
 ⇤ ← Revision 5 as of 2014-07-04 03:01:42 → Size: 1637 Editor: dthree Comment: Fixed my moinmoin syntax. ← Revision 6 as of 2014-07-10 18:57:18 → ⇥ Size: 1635 Editor: PhilippWiesemann Comment: Changed description, see SGFunctions. Deletions are marked like this. Additions are marked like this. Line 28: Line 28: ||'''x'''||floating point value, in radians.|| ||'''x'''||floating point value, in radians|| Line 45: Line 45:
 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\n", 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\n", 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 in >= SDL 2.0.2.

None: SDL_acos (last edited 2016-06-10 19:54:38 by PhilippWiesemann)

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