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Re: shading/outlining on surface plot [message #82759 is a reply to message #82758]

Fri, 18 January 2013 09:25

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Bob Plano writes:

> I probably didn't pick a very good example of what I'm trying to do,
> in that the 'pixels' on the surface plot I want to outline are not
> necessarily contiguous. That is to say, out of a 64 by 64 surface,
> there might be a few dozen points that need to be highlighted or
> outlined, at (apparently) random locations. So, contours won't work,
> at least not in a straightforward way.
>
> I wonder if it's possible to do something like:
>
> shade_surf,z,x,y,shades=col, where most of the col array has values
> that are 'invisible'. I don't suppose there is such a thing...

Actually, something like this works pretty well:

peak = cgdemodata(2)
markedData = Round(Randomu(-5L, 50) * (41*41))
cgLoadCT, 0, /Brewer, /Reverse, NColors=254
markedColor = 'red'
TVLCT, cgColor('red', /Triple), 255
markedImage = BytScl(peak, top=254)
markedImage[markedData] = 255
cgSurface, peak, texture_image=markedimage
END

Here is the result:

http://www.idlcoyote.com/misc/marked_image.png

You see one small problem with a very dark green pixels at the very top
of the data range. I know what causes this and can fix it easily, if you
think something like this works for you.

Cheers,

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

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[Message index]

		Re: shading/outlining on surface plot By: David Fanning on Fri, 18 January 2013 11:51
		Re: shading/outlining on surface plot By: astroboy.20000 on Fri, 18 January 2013 11:11
		Re: shading/outlining on surface plot By: David Fanning on Fri, 18 January 2013 09:43
		Re: shading/outlining on surface plot By: David Fanning on Fri, 18 January 2013 09:25
		Re: shading/outlining on surface plot By: chris_torrence@NOSPAM on Fri, 18 January 2013 09:08
		Re: shading/outlining on surface plot By: astroboy.20000 on Fri, 18 January 2013 09:02
		Re: shading/outlining on surface plot By: chris_torrence@NOSPAM on Thu, 17 January 2013 21:27
		Re: shading/outlining on surface plot By: David Fanning on Thu, 17 January 2013 10:09

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