Re: How to color vector as defined value and defined colors

Hi Adam,

Thanks for the advice.

I made it work now. Based on your advice, somethings need to be changed.

res_at_vcMonoLineArrowColor = True (not for color)
res_at_vcLineArrowColor = "red"
res_at_gsnScalarContour = True

res2_at_vcLineArrowColor = "blue"

Thanks again.

Guangshan

On Sep 18, 2007, at 4:52 PM, Adam Phillips wrote:

> Hi Guangshan,
>
> Yes, I think you could do this by overlaying a 2nd vector field on
> the one drawn by gsn_csm_vector_scalar_map_ce. For instance, you
> would try something like this:
>
> res = True
> ..... ; set appropriate resources
> res_at_gsnDraw = False
> res_at_gsnFrame = False
> res_at_vcMonoLineArrowColor = "red"
> res_at_gsnScalarContour = False
> plot1 = gsn_csm_vector_scalar_map_ce(wks, u, v, var2,res)
>
> u = mask(u,var2.ge.-90.and.var2.lt.90,False)
> v = mask(v,var2.ge.-90.and.var2.lt.90,False)
> res2 = True
> .... ; set appropriate resources
> res2_at_vcMonoLineArrowColor = "blue"
> res2_at_gsnDraw = False
> res2_at_gsnFrame = False
> plot2 = gsn_csm_vector(wks,u,v,res2)
> overlay (plot1,plot2)
> draw(plot1)
> frame(wks)
>
> The resulting plot should have red vectors between -90 and 90, and
> blue vectors otherwise.
> Hope that helps...
> Adam
>
> Guangshan chen wrote:
>> Hi all,
>> I have plotted a figure using "gsn_csm_vector_scalar_map_ce(wks,
>> u, v, var1)" (see attached figure). Now I want to color the
>> vectors by another scalar variable, say var2.
>> Var2 is the degree of the vector: if the vectors point up, then
>> define the degree is 0. If the vectors point left, define -90. If
>> the vector point right, define 90. If the vectors point down,
>> define 180 or -180. Note: I already have the var2, changing for
>> -180 to 180.
>> So I want to use one color to color the vectors that almost point
>> up (-90 ~ 90) and use another color to color the vectors that
>> almost point down (-180 ~ -90, 90 ~ 180). Is there any way to do
>> so (like gray color areas)?
>> Thanks in advance.
>> Guangshan
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> --
> --------------------------------------------------------------
> Adam Phillips asphilli_at_ucar.edu
> National Center for Atmospheric Research tel: (303) 497-1726
> ESSL/CGD/CAS fax: (303) 497-1333
> P.O. Box 3000
> Boulder, CO 80307-3000 http://www.cgd.ucar.edu/cas/asphilli

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Received on Wed Sep 19 2007 - 14:35:53 MDT