Path: utzoo!utgpu!water!watmath!watdragon!tiger!bmacintyre
From: bmacintyre@tiger.waterloo.edu (Blair MacIntyre)
Newsgroups: comp.sys.amiga.tech
Subject: Re: IFF form for 2D drawings (again)
Message-ID: <8170@watdragon.waterloo.edu>
Date: 9 Aug 88 00:47:22 GMT
References: <11640003@hpfcdc.HP.COM> <2412@sugar.uu.net>
Sender: daemon@watdragon.waterloo.edu
Reply-To: bmacintyre@tiger.waterloo.edu (Blair MacIntyre)
Organization: Davis World Amusement Park
Lines: 10

Quite often, rotations are implemented as modifiers to existing shapes.
That is, a rectangle rotated by 45 degrees becomes something like:
<45 deg rotation><data structure for rectangle>.  Quite often, other
transformations, such as scaling, shearing and translations are also
included as modifiers.  The advantage of doing things this way is that
it generalizes better if you have composite objects (ie an object
consisting of a 3 rectangles and an ellipse).

I realize that this is probably not completely relevant, however, I
just thought I'd add my two cents.