1fixtan(3)                       Allegro manual                       fixtan(3)
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NAME

6       fixtan - Fixed point tangent of binary angles. Allegro game programming
7       library.
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SYNOPSIS

10       #include <allegro.h>
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13       fixed fixtan(fixed x);
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DESCRIPTION

16       This function finds the tangent of a value using a  lookup  table.  The
17       input value must be a fixed point binary angle. Example:
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19          fixed angle, res_a, res_b;
20          float dif;
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22          angle = itofix(37);
23          /* Prove that tan(angle) == sin(angle) / cos(angle). */
24          res_a = fixdiv(fixsin(angle), fixcos(angle));
25          res_b = fixtan(angle);
26          dif = fixtof(fixsub(res_a, res_b));
27          allegro_message("Precision error: %f\n", dif);
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RETURN VALUE

30       Returns  the  tangent  of a fixed point binary format angle. The return
31       value will be in radians.
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SEE ALSO

35Allegro                          version 4.2.3                       fixtan(3)
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