[gameprogrammer] Re: Diff Between 2 Angles
- From: Robbert de Groot <zekaric@xxxxxxxx>
- To: gameprogrammer@xxxxxxxxxxxxx
- Date: Thu, 29 Sep 2005 11:49:23 -0400 (EDT)
if (angle < 0) {
angle = -angle;
negate = -1;
}
else {
negate = 1;
}
while (angle > 360) {
angle -= 360;
}
if (angle > 180) {
return negate * (angle - 180);
}
return negate * angle;
--- Stephen <stephen@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> I've got a really simple problem that I'm almost ashamed to ask
> about!
> I've written a 3D pseudo-realtime strategy game called Lazer Squad
> 3D
> (www.carlylesmith.karoo.net/lazersquad3d/). One problem I always
> think
> I've solved, but then comes back to bite me, is how to get the
> difference between two angles. This seems easy on the face of it,
> but
> then along comes two angles and my formula gets it all wrong.
> (This is
> degrees, BTW, not rads).
>
> The main problem is when dealing with negative angles, angles >
> 360, and
> also getting the shortest distance (i.e. not the long way round).
> For
> example, the difference between -359 and 359 should be 2 degrees.
> The
> difference between 90 and -270 should be zero. Etc.. etc.. Can
> anyone
> help please?
>
> Thanks in advance,
>
> Steve Smith
>
>
>
>
>
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