[ncl-talk] Overlay on two plots

[Adam Phillips]

Hi Carl,
To do this I don't believe there's a way around creating plot a twice. If a
is to be used in two overlays you will need two separate instances of a for
it to be properly overlaid.
Adam

On Fri, Jan 4, 2019 at 9:54 AM Carl Schreck <cjschrec at ncsu.edu> wrote:

> Sorry for not being clear, that actually is what I want to do... Overlay a
> onto both b & c. The workaround I'm using now is to have my function return
> an array. Something like:
>
> a = new( 2, graphic )
> a(0) = gsn_csm_contour( wks, aData, res )
> a(1) = gsn_csm_contour( wks, aData, res )
> b = gsn_csm_contour( wks, bData, res )
> c = gsn_csm_contour( wks, cData, res )
>
> overlay( b, a(0) )
> overlay( c, a(1) )
>
> On Fri, Jan 4, 2019 at 10:35 AM James Russell <jorussel at ncsu.edu> wrote:
>
>> Carl,
>>
>> I haven’t had a chance to check since I’m on my phone but I think that’s
>> happening because you’ve got the overlay order reversed. The base plot
>> should be the first index. The overlay should be the second. I think you
>> should have:
>>
>> overlay(a,b)
>> overlay(a,c)
>>
>> What I think you are doing is overlaying a onto b, and then trying to
>> overlay a onto c. But a is already an overlay on b, hence why you are
>> getting that error.
>>
>> Thanks,
>> James
>>
>> On Fri, Jan 4, 2019 at 8:02 AM Carl Schreck <cjschrec at ncsu.edu> wrote:
>>
>>> Is there any workaround to be able to overlay one plot onto two others?
>>> i.e.,
>>>
>>> a = gsn_csm_contour( wks, aData, res )
>>> b = gsn_csm_contour( wks, bData, res )
>>> c = gsn_csm_contour( wks, cData, res )
>>>
>>> overlay( b, a )
>>> overlay( c, a )
>>>
>>> That gives the error:
>>> fatal:NhlAddOverlay: tranform is already an annotation or overlay: 30
>>>
>>> I tried simply copying a:
>>> a = a2
>>> overlay( b, a )
>>> overlay( c, a2 )
>>>
>>> But that gives the same error. I know it's not too difficult to call the
>>> plotting routine twice. But a lot of times I have graphics as return values
>>> from functions, so it'd be nice if there were some kind of copy_graphics
>>> function so I wouldn't have to run those again.
>>>
>>> First world problems, but figured I'd ask... Thanks!
>>> Carl
>>>
>>> --
>>>
>>> <https://ncics.org/> *Carl J. Schreck III, PhD*
>>> *Research Scholar*
>>> North Carolina State University <http://ncsu.edu/>
>>> North Carolina Institute for Climate Studies (NCICS)
>>> <https://ncics.org/>
>>> 151 Patton Ave, Asheville, NC 28801
>>> e: cjschrec at ncsu.edu
>>> o: +1 828 257 3140 <(828)%20257-3140>
>>> c: +1 828 484 1702 <(828)%20484-1702>
>>> Publications
>>> <http://scholar.google.com/citations?hl=en&user=th8ONEcAAAAJ&view_op=list_works&sortby=pubdate>
>>> ncics.org/mjo
>>> CycloneCenter.org <https://www.cyclonecenter.org/>
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>> --
>> This message was sent from my mobile device. Sorry for the brevity!
>>
>> go.ncsu.edu/james-russell
>>
>
>
> --
>
> <https://ncics.org/> *Carl J. Schreck III, PhD*
> *Research Scholar*
> North Carolina State University <http://ncsu.edu/>
> North Carolina Institute for Climate Studies (NCICS) <https://ncics.org/>
> 151 Patton Ave, Asheville, NC 28801
> e: cjschrec at ncsu.edu
> o: +1 828 257 3140 <(828)%20257-3140>
> c: +1 828 484 1702 <(828)%20484-1702>
> Publications
> <http://scholar.google.com/citations?hl=en&user=th8ONEcAAAAJ&view_op=list_works&sortby=pubdate>
> ncics.org/mjo
> CycloneCenter.org <https://www.cyclonecenter.org/>
> _______________________________________________
> ncl-talk mailing list
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-- 
Adam Phillips
Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
www.cgd.ucar.edu/staff/asphilli/   303-497-1726

<http://www.cgd.ucar.edu/staff/asphilli>
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