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Re: POLYFILLV weirdness [message #51425 is a reply to message #51350]

Sun, 19 November 2006 14:43

Jean H.
Messages: 472
Registered: July 2006

Senior Member

dktr.ted@gmail.com wrote:
>> PolyFillV is not using the provided polygons coordinates but a "fix()"
>> of them.... which induce this extra line on the left and at the bottom
>> (and a few missing pixels on the right side and on the top If I remember
>> well). I personnaly used a round() over my polygon coordinates and it
>> was returning much better results... though still not perfect!
>
>
> This practice is particularly horrifying to me considering I frequently
> use ROIs defined in physical coordinates and convert them to array
> coordinates (commonly fractional) before running POLYFILLV. Is there
> anywhere I can have a look at the actual algorithm used in IDL for this
> routine? The documentation references the scan line coordinate system
> defined in Rogers, Procedural Elements of Computer Graphics, 1985, but
> I'm reluctant to hunt down this out of print text without confirmation
> that I will get something useful out of it.
> Ted

Hi Ted,

the code is not available... but you can have a look here:
http://www.ittvis.com/services/techtip.asp?ttid=3539
The process is a bit more explained...

Jean

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[Message index]

		POLYFILLV weirdness By: dktr.ted on Thu, 16 November 2006 19:29
		Re: POLYFILLV weirdness By: badjelly.witch on Mon, 20 November 2006 14:49
		Re: POLYFILLV weirdness By: JD Smith on Mon, 20 November 2006 12:31
		Re: POLYFILLV weirdness By: Jean H. on Sun, 19 November 2006 14:43
		Re: POLYFILLV weirdness By: dktr.ted on Fri, 17 November 2006 15:52

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