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Re: shading/outlining on surface plot [message #82771 is a reply to message #82762]

Thu, 17 January 2013 21:27

chris_torrence@NOSPAM is currently offline

chris_torrence@NOSPAM
Messages: 528
Registered: March 2007

Senior Member

On Thursday, January 17, 2013 11:09:38 AM UTC-7, David Fanning wrote:
> Bob Plano writes:
>
>
>
>> Sorry if this is a dumb question, but....
>
>>
>
>> I'd like to make a surface or shade_surf plot, and outline areas on
>
>> the surface. The basic idea is here:
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>>
>
>>
>
>>
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>> make_2d_gaussian,arr,xx,yy ;xx and yy are 2D
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>> grid point arrays
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>>
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>> shade_surf, arr,xx,yy,shades=whatever
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>>
>
>> keep=where( arr gt .5*max(arr) and arr lt .7*max(arr) )
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>>
>
>> sub_outline_procedure,arr(keep),xx(keep),yy(keep) ???????????????????
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>>
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>>
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>>
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>> Is there a relatively easy way to do this?
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>
>
> No, there are no easy ways to do this, I don't believe, although maybe
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> this is a case where function graphics can come to the rescue. One
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> problem is writing on the surface. It is very difficult to know,
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> unfortunately, where the actual surface *is*, due to round-off errors,
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> mostly.
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>
>
> You might try drawing a contour line on top of an image, then using that
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> to drape over the surface, but I don't expect good results. :-(
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>
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> 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.")

Hi Bob,

How about something like the following:

; Sample data, stored in the "elev" variable
RESTORE, FILEPATH('marbells.dat', $
SUBDIRECTORY=['examples', 'data'])

s = SURFACE(elev, COLOR='brown')

; Give two colors so we fill in between the contour level and the top.
c = CONTOUR(elev, C_VALUE=3800, PLANAR=0, /OVERPLOT, /FILL, $
C_COLOR=['white','white'], RGB_TABLE=0)

; Turn off labels, which are on by default.
c = CONTOUR(elev, C_VALUE=3800, PLANAR=0, /OVERPLOT, $
C_COLOR=0, RGB_TABLE=0, C_LABEL_SHOW=0, C_THICK=4)

Cheers,
Chris
ExelisVIS

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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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