Thanks so much Jim, but alas, as this screenshot shows neither axis will ever be parallel since this is a 2D perspectiev drawing utility. This second image of the link is a screenshot shows a typical VP setup that might exist and all the variations of ellipses that might result... http://www.tjframe.com/EllipseExample.htm But as I alluded to earlier, Perhaps this would be beyond the scope of something I could implement. I know that 3D do ellipses every day, all day long, so I had assumed it would be a straightfoward task. But I guess they use matrix calculations to generate the points of the object rotated and stuff. Perhaps I would need to have a 3D underpinning for the ellipse stuff to work.. For now I'll put that feature on hold. Thanks again guys, - TJ
On 9/26/05, Jim Hurley <[EMAIL PROTECTED]> wrote: > > > > >Message: 15 > >Date: Mon, 26 Sep 2005 13:47:41 -0700 > >From: TJ Frame <[EMAIL PROTECTED]> > >Subject: Re: another yucky geometry question > >To: How to use Revolution <[email protected]> > >Message-ID: <[EMAIL PROTECTED]> > >Content-Type: text/plain; charset=ISO-8859-1 > > > >Thanks for your help guys, I didn't realize it was so tough a problem to > >solve :( > > perhaps I'll have to rethink the way I'd like to implement them. > > TJ, > > I think I see what you are looking for: An ellipse which is tangent > to the two radial lines and the two end lines. confined between the > two end lines--also tangent to the ellipse. > > The stack below calculates the point on the ellipse where the tangent > to the ellipse is parallel to the radial lines and then puts the > ellipse there. I have confined myself to the case where the major > axis of the ellipse is parallel to the x axis. It gets grubby > otherwise. This was fun. I hate grubby. > > In the message box: > > go stack url "http://home.infostations.net/jhurley/EllipseInAbox.rev"; > > Hope this helps. > > Jim > _______________________________________________ > use-revolution mailing list > [email protected] > Please visit this url to subscribe, unsubscribe and manage your > subscription preferences: > http://lists.runrev.com/mailman/listinfo/use-revolution > _______________________________________________ use-revolution mailing list [email protected] Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
