Path: utzoo!attcan!uunet!wuarchive!zaphod.mps.ohio-state.edu!rpi!crdgw1!montnaro From: montnaro@spyder.crd.ge.com (Skip Montanaro) Newsgroups: comp.graphics Subject: Re: Curve through 3 points Message-ID: Date: 15 Aug 90 16:13:24 GMT References: <184410@<1990Aug13> <23900010@sunb5> Sender: news@crdgw1.crd.ge.com Reply-To: montanaro@crdgw1.ge.com (Skip Montanaro) Organization: GE Corporate Research & Development, Schenectady, NY Lines: 22 In-reply-to: mcooper@sunb5.cs.uiuc.edu's message of 14 Aug 90 13:40:00 GMT In article <23900010@sunb5> mcooper@sunb5.cs.uiuc.edu writes: look under "Bezier Curves" in any graphics textbook (Foley &VanDam come to mind) Bezier curves have several nice properties, including local spline control, the control points form a convex hull for the spline, and the ability to easily make successive chunks piecewise continuous, but they don't interpolate their control points. That make them more difficult to use interactively, since the curve generated is not immediately obvious from the control points. A simple place to see an easily implementable definition is in the PostScript Red Book, under the section on the curveto operator. The PostScript generated by the idraw graphics editor generates multi-segment bezier curves that are piecewise continuous. -- Skip (montanaro@crdgw1.ge.com)