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Re: Computer Graphics Question [message #40426 is a reply to message #40419]

Wed, 04 August 2004 21:03

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Craig Markwardt writes:

> David, I think your problem is that you are working in normal
> coordinates, but as you appear to be aware, this leads to unequal grid
> spacing in the two directions (i.e. non-isotropic).
>
> I do not think that the SCALE keyword is enough for you.
>
> My guess is that the easiest thing to do is to convert to pixel
> coordinates, do your rotation, and then convert back to normal
> coordinates. The pixel coordinate system is isotropic, so you are
> set.

Well, maybe so, but part of my excitement with
this project was finally coming to some uneasy truce
with the computer graphics mathematics involved.
I finally felt like I was starting to understand
something. (Or maybe it was just a bit of indigestion,
I'm not really sure.)

Anyway, I'll give the ridged pixel thing a try. :-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: Computer Graphics Question By: Craig Markwardt on Thu, 05 August 2004 08:15
		Re: Computer Graphics Question By: David Fanning on Thu, 05 August 2004 07:51
		Re: Computer Graphics Question By: David Fanning on Wed, 04 August 2004 21:03
		Re: Computer Graphics Question By: Craig Markwardt on Wed, 04 August 2004 20:25

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