Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!apple!brutus.cs.uiuc.edu!wuarchive!wugate!uunet!kddlab!titcca!dclsic!soumgw!rena!ascgw!fgw!flab!mima From: mima@pattern.flab.fujitsu.co.jp (MIMA T.) Newsgroups: comp.graphics Subject: Re: Tilted ellipse. Message-ID: Date: 13 Oct 89 10:09:13 GMT References: <4821@druco.ATT.COM> Sender: news@flab.flab.fujitsu.co.jp Distribution: comp Organization: Fujitsu Laboratories Ltd., Kawasaki, Japan. Lines: 18 In-reply-to: connors@druco.ATT.COM's message of 8 Oct 89 05:57:22 GMT In article <4821@druco.ATT.COM>, connors@druco.ATT.COM (ConnorsPA) says: > Does anyone have an algorithm, or code, for drawing > a TILTED ellipse quickly on a bit-mapped device? How about Pitteway's method ? M.L.V.Pitteway,`Algorithm for drawing ellipses or hyperbolae with a digital plotter," COMPUTER JOURNAL, vol.10, no.3, pp.282-289, Nov.1967. It's for drawing conic section curve segment, with incremental strategy like Bresenham's DDA. Inner cycle consists of three additions and one test for each move. -- MIMA, Toshiya Fujitsu Laboratories Ltd. Tel: +81 44 777-1111 ext.2-6182 E-mail: mima@flab.fujitsu.co.jp