Re: Draft Animator Broken?

[Neil Moore <neil s-z org>]

On Tue, Apr 07, 2009 at 03:38:36PM +0900, Teika Kazura wrote:
> I doubt if I can implement float -> int. (I'll deal with the doc.)
> I don't know either what's the recommended way to do so in C. Let f a
> float var.
> 1. Check that the abs(f) is small enough to be int.
> 2. Do (int) round(f).
> Is this so?

C99 and modern Posix have lround() and llround() to round doubles to
longs and long longs, respectively (lroundf() and llroundf() for
floats).  I don't know about portability to older systems, though.
There is no function to round specifically to an int; I suppose you
could take the smaller of lround(f) and (long)INT_MAX , and cast that
to an int.