[ncl-talk] box plots - lines and box fills/draw order

[Adam Phillips]

Hi James,
I originally created the boxplot function that was put into NCL. Looking
back I wish I had made it a bit more flexible in terms of the box drawing
options. A few years ago I created a new function unoriginally named
"boxplot2", that allows the user to color fill the boxes (and change the
color of the mid-line). It also hardwired the lines to the bottom/top
values to solid. I have attached the code here. The function works exactly
the same as boxplot, but allows the use of two additional options for the
first resource list (named boxOpts in the documentation): boxFill_Colors
(sets the colors that fill the boxes) and boxFill_midColor (sets the
mid-value line color). An example of the use of the function to draw 2
boxes:

bres = True
bres at vpWidthF = 0.6
bres at vpHeightF = 0.45
bres at tiYAxisString = "(~S~o~N~C)"

llres                   = True
llres at gsLineThicknessF  = 1.5                 ; line thickness

opti          = True
opti at boxWidth = .3 ; Width of box (x units)
opti at boxFill_Colors := (/-1,1/)
opti at boxFill_midColor := (/1,0/)
opti at boxColors := (/1,1/)
bplg = boxplot2(wks,(/0.5,1.5/),yval_lg,opti,bres,llres)

Note that you can make any edits to the boxplot2 function as you would
like, and can thus improve upon the function.
Hope that helps!
Adam


On Thu, Apr 21, 2022 at 7:09 AM James Ciarlo' via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Dear NCL users,
>
> I am trying to draw a boxplot - which for the most part has been
> successful. However, there are two details that I would like to change but
> can't seem to figure out. I have attached the ncl script (please note that
> I haven't added the data as it's vast and in different directories) and the
> current image produced.
>
>
> *lines to bottom/top values: *
> I want the lines to be solid instead of dashed, but gsLineDashPattern is
> not working. I have tried it with different resources on lines 303 and 307.
>
> *box-fill:*
> I want to put a grey box fill to the boxplot elements. From what I could
> find this is not an option, so I resorted to drawing polygons. But before I
> write the proper polygon positions, I drew a box that overlaps the boxplot
> elements - I want it to appear in the background, and I am probably using
> the DrawOrder incorrectly.
>
> Thank you for your help
> James
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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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