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Re: Polygon filling oddities [message #26936]

Thu, 04 October 2001 05:01

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Mark Hadfield (m.hadfield@niwa.cri.nz) writes:

> I guess POLYFILLV and IDLanROI are intended for dealing with regions of
> interest on images and it is anticipated that the vertices of the ROI will
> be in the positive quarter-plane. But I don't see any reason why they
> shouldn't be able to work with negative vertex coordinates.
>
> So is what I've found a bug or a feature? Can others reproduce my results?
> (I've been using IDL 5.4.)

I can reproduce your results. But I can also
get the PolyFillV code to work by making this
change:

p = polyfillv(0 > x < (!D.X_Size-1), 0 > y < (!D.Y_Size-1), 500, 500)

Although, I do notice a small problem in
the very corner of the image. There is always
a pixel or two that is not filled properly.
I'm not sure whether your problem is a bug
or not, but I'm sure *this* is. :-)

Cheers,

David
--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: Polygon filling oddities By: David Fanning on Thu, 04 October 2001 05:01
		Re: Polygon filling oddities By: Craig Markwardt on Wed, 03 October 2001 18:18
		Re: Polygon filling oddities By: Mark Hadfield on Thu, 04 October 2001 16:04
		Re: Polygon filling oddities By: Mark Hadfield on Thu, 04 October 2001 14:40

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