fixcos(3)

📦 version 4.4.3.1, in fedora 43, fedora 44

✨ NAME ✨

okay bestie, welcome to fixcos(3) from the Allegro manual — yes, the Allegro game programming library is in the building. 💖

  • fixcos — Fixed point cosine of binary angles. Part of the Allegro game programming library, periodt.

🌸 SYNOPSIS 🌸

#include <allegro.h>

fixed fixcos(fixed x);

like, you include the header and call fixcos with a fixed value. easy. ✨

🦋 DESCRIPTION 🦋

This function finds the cosine of a value using a lookup table. The input value must be a fixed point binary angle. No cap. Example:

fixed angle;
float result;

/* Set the binary angle to 45 degrees. */
angle = itofix(32);
/* The cosine of 45 degrees is about 0.7071. */
result = fixtof(fixcos(angle));
ASSERT(result > 0.7 && result < 0.71);

So you set a binary angle with itofix(32) for 45 degrees, then fixcos it, then fixtof the result, and the assertion checks it's between 0.7 and 0.71. 💅

🎀 RETURN VALUE 🎀

Returns the cosine of a fixed point binary format angle. The return value will be in radians. So like, even though the input is a binary angle, the answer comes back in radians — don't get it twisted, bestie. 🔥

🌈 SEE ALSO 🌈

tiny detail: the original SEE ALSO line has a stray leading comma before ex12bit(3). iconic, honestly. 💀

that's the whole fixcos(3) page, bestie. source/version: Allegro, version 4.4.3. date: the original footer didn't list one, so no made-up date here — just pure Allegro energy. 🫶💖

📦 where this page comes from