[ncl-talk] How to change color bar for the second field using gsnHistogramCompare

[Mary Haley]

Hi,

The gsn_histogram code needs to be cleaned up so it can handle color
better. I'm looking into this and hope to have a fix.

The issue is trying to handle the different color types that can now come
in:

 - named colors ("red", "blue")
 - indexed color (1, 3, 7)
 - RGB color
 - RGBA color

Right now the code is assuming either RGB or indexed color AND it doesn't
recognize the fact that you might have a second set of bars that you might
want colored differently.   It's not a bug, but just the way the code was
implemented.  It could be thought out better!

--Mary


On Mon, May 16, 2016 at 3:09 AM, rK Aditya <aditya.rk at gmail.com> wrote:

> Dear All,
>
> Got it! I need to change gsn_code.ncl and introduce
>
> gsres at gsFillColor = fillcolor(j) manually inside do j=nbarsinbin-1,0,1.
>
> Cheers,
> -r/K-
>
> On Mon, May 16, 2016 at 6:59 AM, rK Aditya <aditya.rk at gmail.com> wrote:
>
>> Dear Guilherme,
>>
>> Thank you for the suggestion. I tried to activate gsnXYBarChart toTrue as
>> well, but  gsnXYBarChartColors2 or gsnXYBarChartColors are not valid
>> resources for this. I still could not change the color bar for the second
>> field.
>>
>> Kindest regards,
>> -r/K-
>>
>>
>>
>> On Mon, May 16, 2016 at 2:08 AM, Guilherme Martins <jgmsantos at gmail.com>
>> wrote:
>>
>>> I'm note sure but try: gsnXYBarChartColors2 or gsnXYBarChartColors.
>>>
>>> Guilherme.
>>>
>>> Em dom, 15 de mai de 2016 às 16:11, rK Aditya <aditya.rk at gmail.com>
>>> escreveu:
>>>
>>>> Dear All,
>>>>
>>>> I would like to compare histogram for two seasons; winter and summer. I
>>>> use the first field for summer and put it with filled red color. But I
>>>> could not change the color in the second field, on crosshatch pattern to
>>>> other color, let say blue.
>>>>
>>>> If someone can help me?
>>>>
>>>> Thank you for your time.
>>>>
>>>> Kindest regards,
>>>> -r/K-
>>>>
>>>>
>>>> begin
>>>> ;************************************************
>>>> ; Generate some random data.
>>>> ;************************************************
>>>>   x = new(1000,integer)
>>>>   y = new(1000,integer)
>>>>   do i=0,dimsizes(x)-1
>>>>     x(i) = rand()
>>>>     y(i) = rand()
>>>>   end do
>>>>   x = x/320
>>>>   y = y/320
>>>>
>>>> ;************************************************
>>>> ; Set up a variable to hold both x and y.
>>>> ;************************************************
>>>>   z = new((/2,dimsizes(x)/),integer)
>>>>   z(0,:) = x
>>>>   z(1,:) = y
>>>> ;************************************************
>>>> ; create plot
>>>> ;************************************************
>>>>   wks = gsn_open_wks("png","histo")              ; send graphics to PNG
>>>> file
>>>>   gsn_define_colormap(wks,"temp1")               ; choose colormap
>>>>
>>>>   res                            = True          ; plot mods desired
>>>>   res at gsnHistogramCompare        = True
>>>>   res at gsnHistogramBinIntervals = (/25,50,75/)
>>>> ;  res at gsFillColors = (/(/"blue","red"/),(/"blue","red"/)/)
>>>> ;  res at gsFillColor=(/"blue","blue","red","red"/)
>>>>   res at gsnHistogramBarColors = (/(/"red","blue"/),(/"red","blue"/)/)
>>>> ;  res at gsnHistogramBarColors=(/"blue","blue","red","red"/)
>>>>   plot=gsn_histogram(wks,z,res)                  ; create histogram
>>>> end
>>>> [image: Inline image 1]
>>>> _______________________________________________
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>>>>
>>> --
>>>
>>> ------------------------------------------------------------------------------------------
>>> Dr. Guilherme Martins
>>> Instituto Nacional de Pesquisas Espaciais (INPE)
>>> Centro de Previsão de Tempo e Estudos Climáticos (CPTEC)
>>> Grupo de Desenvolvimento em Assimilação de Dados (GDAD)
>>> Telefone (INPE/CP): +55 12 3186-8551 || Celular (TIM): +55 12 98152-8580
>>> E-mail: guilherme.martins at inpe.br || jgmsantos at gmail.com
>>> Skype: guilherme.martins.
>>> Homepage: https://sites.google.com/site/jgmsantos
>>> Currículo Lattes: http://lattes.cnpq.br/5997657584785803
>>>
>>> ------------------------------------------------------------------------------------------
>>>
>>
>>
>
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