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Re: How to define resolution (not dimension!) for IDLanRoi->computeMask [message #65051]

Mon, 09 February 2009 07:11

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

justspam03@yahoo.de writes:

> eieieiei - I was afraid I'd need to do something like this :-(
> Well, I guess I'll have my own overloaded computeMask... I anyway
> subclass from IDLanRoi.

Well, somehow you have to get from a data coordinate system
into a pixel coordinate system. There are probably other
ways to do it. I showed you what I do in direct graphics.
There are certainly comparable methods in object graphics,
but I don't know what they are. :-)

I suppose you could use the old Scale_Vector/Value_Locate
trick to find the device values of your ROI:

s = Size(image)
xvec = Scale_Vector(Findgen(s[0], 1, 5)
yvec = Scale_Vector(Findgen(s[1], 1, 5)
xdevice = Value_Locate(xvec, x)
ydevice = Value_Locate(yvec, y)
indices = PolyFillv(xdevice, ydevice, s[0], s[1])

I haven't tested that, but it should work. :-)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: How to define resolution (not dimension!) for IDLanRoi->computeMask By: David Fanning on Mon, 09 February 2009 07:11
		Re: How to define resolution (not dimension!) for IDLanRoi->computeMask By: justspam03 on Mon, 09 February 2009 06:56
		Re: How to define resolution (not dimension!) for IDLanRoi->computeMask By: justspam03 on Mon, 09 February 2009 06:09
		Re: How to define resolution (not dimension!) for IDLanRoi->computeMask By: ben.bighair on Tue, 10 February 2009 06:13
		Re: How to define resolution (not dimension!) for IDLanRoi->computeMask By: David Fanning on Tue, 10 February 2009 05:52
		Re: How to define resolution (not dimension!) for IDLanRoi->computeMask By: ben.bighair on Tue, 10 February 2009 05:26
		Re: How to define resolution (not dimension!) for IDLanRoi->computeMask By: justspam03 on Tue, 10 February 2009 04:00

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