Path: chuka.playstation.co.uk!news
From: Philip Gooch <philg@nospam.easynet.co.uk>
Newsgroups: scee.yaroze.beginners
Subject: Clever bit manipulation routines?
Date: Thu, 23 Jul 1998 20:54:45 +0100
Organization: philg@nospam.easynet.co.uk
Lines: 27
Message-ID: <35B79502.BC7489D6@nospam.easynet.co.uk>
Reply-To: philg@nospam.easynet.co.uk
NNTP-Posting-Host: philg.easynet.co.uk
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii; x-mac-type="54455854"; x-mac-creator="4D4F5353"
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 4.04 (Macintosh; I; PPC)

Hello folks

I've got a few lines of code that look ugly and wondered if there's a
clever bit manipulation routine using shifting, ANDing and complement or
something to achieve the same thing. I'm sure there's a way, just can't
figure it out.

Basically:

if (gPlayer.turningAngle > 45) gPlayer.turningAngle = 45;
if (gPlayer.turningAngle < -45) gPlayer.turningAngle = -45;

I'm convinced there's something out there that will handle both of these
in one line, something like
(~(gPlayer.turningAngle) & 0x2d) >> something. Though obviously not
this!

Do you see what I'm getting at? Something that will leave the variable
unchanged unless it is greater or less than a certain value, in which
case it becomes that value.

Anyone have any ideas?

Cheers

Phil