Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.glorb.com!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail From: Lew Newsgroups: comp.lang.java.programmer Subject: Re: What are the proper terms for these concepts? Date: Tue, 13 Mar 2012 11:25:27 -0700 (PDT) Organization: http://groups.google.com Lines: 35 Message-ID: <31042512.49.1331663127457.JavaMail.geo-discussion-forums@pbcsk1> References: NNTP-Posting-Host: 69.28.149.29 Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 X-Trace: posting.google.com 1331663128 10936 127.0.0.1 (13 Mar 2012 18:25:28 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Tue, 13 Mar 2012 18:25:28 +0000 (UTC) In-Reply-To: Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=69.28.149.29; posting-account=CP-lKQoAAAAGtB5diOuGlDQk0jIwmH0T User-Agent: G2/1.0 Xref: csiph.com comp.lang.java.programmer:12981 Daniel Pitts wrote: > I have a few concepts in a program I'm writing, but I'm not sure if > there are "canonical" terms for them, and would like to use those terms > if possible. All these terms are for 2 dimensional shapes, but if there > is a more general term for n dimensional I'd be interested in that as > well, just for knowledge sake. > > In my codebase, it makes sense to distinguish between an absolute angle > and a relative angle. Absolute angles are really relative to the fixed > "east" vector, and Relative angles are clockwise or counter-clockwise > rotations. You can scale relative angles, but not absolute angles. You > can add relative angles to each other or to absolute angles, but > absolute angles can't be added to each other. You can find a relative > angle between two absolute angles. Is there a more formal concept of this? > > One thing I'm calling an "angle bracket", which is basically two angles, > the absolute angle "clockwise-bound" and the relative angle "width". > This can include a zero width bracket (basically just a ray), or an all > inclusive bracket. > > If I add a radius to that (to make it a pie slice), the term I found is > "sector". Is a full circle also a "sector"? How about if the angle is zero? The term "bearing" comes to mind, and I recall "absolute" vs. "relative" - let me double check. http://en.wikipedia.org/wiki/Bearing_(navigation) http://en.wikipedia.org/wiki/Relative_bearing http://en.wikipedia.org/wiki/Absolute_bearing The term "bearing" matches what you want as the augend. The addend you want is "angle". So you add an angle to a bearing to get a new bearing. -- Lew