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POLYFILLV weirdness [message #51350]

Thu, 16 November 2006 19:29

dktr.ted
Messages: 17
Registered: November 2006

Junior Member

Hi all,

I've been having problems with POLYFILLV. Consider the case below:

IDL> verts = TRANSPOSE([ [ 2, 3.25, 2, 0.75, 2 ], [ 0.75, 2, 3.25, 2,
0.75 ] ])
IDL> dim = [ 6, 6 ]
IDL> inside = POLYFILLV(verts(0,0:3), verts(1,0:3), dim(0), dim(1))

Verts defines a diamond of width 2.5, centered at [2, 2], which
according to the POLYFILLV documentation should be the center of pixel
[2, 2]. The results of the POLYFILLV call should give me 5 pixels,
specifically [2, 3], [1, 2], [2, 2], [3, 2], and [2, 1]. However,
instead I get 6 pixels, those listed plus [3, 3]. From the POLYFILLV
documentation I can't for the life of me figure out how this extra
pixel would be regarded as being inside the diamond.

Has anyone else encountered any funny effects at polygon edges when
using POLYFILLV? Any advice or commiseration would be much
appreciated. Thanks!

Ted

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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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