Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!sundc!pitstop!sun!pepper!cmcmanis From: cmcmanis%pepper@Sun.COM (Chuck McManis) Newsgroups: comp.sys.amiga Subject: Re: Layers Lib./Clipping Message-ID: <35435@sun.uucp> Date: Thu, 3-Dec-87 12:40:11 EST Article-I.D.: sun.35435 Posted: Thu Dec 3 12:40:11 1987 Date-Received: Mon, 7-Dec-87 05:21:17 EST References: <8712010903.AA22789@cory.Berkeley.EDU> <1897@cadovax.UUCP> Sender: news@sun.uucp Reply-To: cmcmanis@sun.UUCP (Chuck McManis) Organization: Sun Microsystems, Mountain View Lines: 20 In article <1897@cadovax.UUCP> keithd@cadovax.UUCP (Keith Doyle) writes: > Somehow I don't think this is competely true [that Layers clip] . > I've opened a full screen BORDERLESS | BACKDROP window and used > ellipse/circle to render into it, and later found the parts of circles > that had extended off screen sitting in other buffers. Not sure just > where clipping is done and isn't, but it does lead me to believe it's > not automatic on all OpenWindow() windows. On BIX this was reported as a bug with the AreaEllipse routine. Your TmpRas can get strange stuff in it, and the ellipsi don't clip to the window. I am not sure if Dale signed up to fix it or not, hopefully when he gets a chance he will comment on this as well. I wrote a routine that created an ellipse by calculating it with Bresenhams (sp?) method, converted it to line segments and then used AreaMove/AreaDraw to fill it in. That seems to work correctly. --Chuck McManis uucp: {anywhere}!sun!cmcmanis BIX: cmcmanis ARPAnet: cmcmanis@sun.com These opinions are my own and no one elses, but you knew that didn't you.