QD ovals

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Article #7012

#7012

From: shirley
Date: Fri, 29 Aug 1986 02:54

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I've noticed that Quickdraw ovals are sometimes strange-- often there are
"clumps" of pixels that seem too dense, and even more strange are complete
breaks in ovals (I've only noticed these breaks in ovals of high eccentricity).
I don't think that these ovals are generated by a Bressenham-like algorithm, 
mainly because of the breaks.  Does anyone know the algorithm that is used?
Any references?  Is a non-standard algorithm being used to save space in ROM,
and/or is it a fast algorithm?  

				Thanks in advance,

				Peter Shirley
				University of Illinois

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Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!caip!clyde!cbatt!cbosgd!ihnp4!inuxc!pur-ee!uiucdcs!shirley
From: shirley@uiucdcs.CS.UIUC.EDU
Newsgroups: net.micro.mac
Subject: QD ovals
Message-ID: <99700035@uiucdcs>
Date: Thu, 28-Aug-86 22:54:00 EDT
Article-I.D.: uiucdcs.99700035
Posted: Thu Aug 28 22:54:00 1986
Date-Received: Sun, 31-Aug-86 05:06:41 EDT
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Nf-From: uiucdcs.CS.UIUC.EDU!shirley    Aug 28 21:54:00 1986