[ncl-talk] Plotting polygons on xy plot

[Andrew Kren - NOAA Affiliate]

Thanks Mary. I got my bars to show up now and my colors are plotting
corrrectly. I still have the issue of the plot showing up twice on top of
itself. Do you know why that could be? I am looking it over as I email
this, but currently can't figure it out. Also, I can't figure out why the X
reference line does not show up. See attached.

Thanks for your help,

On Thu, Apr 20, 2017 at 5:30 PM, Mary Haley <haley at ucar.edu> wrote:

> Hi Andrew,
>
> You are close.
>
>  In order for all the polygons to show up, the return value from
> gsn_add_polygon must be unique.
>
> You have the gsn_add_polygon call inside a double do loop, and inside of
> the innermost loop you have:
>
>     dum2 = new(dimsizes(temp_variable_3),graphic)
>
> and then later:
>
>     dum2(a) = gsn_add_polygon(wks,plot_without_ygrid,xbar,ybar,bres)
>
> What's happening is that for each iteration of "a", dum2 is being reset to
> an empty array. Any previous calls to gsn_add_polygon have been effectively
> wiped out.
>
> Also, given that you have two do loops, you will need to move this dum2
> call to outside of both do loops and make it big enough to accommodate both
> loops:
>
> ntvar3 = dimsizes(temp_variable_3)
> nregns = 5
> dum2   = new((/nregns,ntvar3/),graphic)
>
> do i=0,nregns-1 ; loop over regions
> . . .
>
> do a=0,ntvar3-1 ; loop over all values for this region
>
>  . . .
>  dum2(i,a) = gsn_add_polygon(wks,plot_without_ygrid,xbar,ybar,bres)
>   . . .
> end do
> . . .
> end do
>
> Another way to do this that doesn't involve creating a "dum2" variable is
> to use "unique_string" to create a unique name, and then use this unique
> name as an attribute to any variable that holds the return value from
> gsn_add_polygon. I usually use the "plot" variable:
>
>  plot@$unique_string("polygon")$ = gsn_add_polygon(wks,plot_
> without_ygrid,xbar,ybar,bres)
>
>
> Hopefully by fixing this, your other issues with colors will resolve
> themselves.
>
> --Mary
>
>
>
>
> On Thu, Apr 20, 2017 at 4:51 PM, Andrew Kren - NOAA Affiliate <
> andrew.kren at noaa.gov> wrote:
>
>> Dear ncl-talk,
>>
>> I am trying to plot a number of polygons on an xy plot, but for some
>> reason, the polygons are not showing up. The only one that shows up is the
>> last one. Also, the colors don't seem to work correctly, as they are all
>> red and not varying based on my color array. The other problem is that the
>> plot seems to be plotting twice and I can't figure out why. Attached is the
>> figure and the program. The program is long so the only issue in the
>> program starts at line 3148 and ends at 3209.
>>
>> Thanks much,
>>
>> --
>> Andrew Kren, PhD
>> Research Scientist I, Global Observing Systems Analysis (GOSA) Group
>> NOAA ESRL Global Systems Division (Rm 3C515)
>> 325 Broadway, Boulder, CO 80305
>> (303) 497-5418
>>
>> _______________________________________________
>> ncl-talk mailing list
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>>
>>
>


-- 
Andrew Kren, PhD
Research Scientist I, Global Observing Systems Analysis (GOSA) Group
NOAA ESRL Global Systems Division (Rm 3C515)
325 Broadway, Boulder, CO 80305
(303) 497-5418
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