Date: Sat Aug 10 2013 - 01:22:01 MDT
It's great. But is there any way to implement this in NCL v.6.0.0 or 6.1.2
instead of next release 6.2 ?
I implemented this code but I produced different color, not like what I was
expecting before.
On Sat, Aug 10, 2013 at 11:04 AM, Mary Haley <haley@ucar.edu> wrote:
>
> On Aug 9, 2013, at 1:01 PM, Xi Chang wrote:
>
> Hallo NCL,
>
> Thanks for the idea, However I just wonder
> 1. how can I possibly change the color, for instance from black to be
> *SlateBlue"? and
>
>
> You will still have to use RGBA triplets in order to get the transparency,
> but first, you can see our list of named colors at:
>
> http://www.ncl.ucar.edu/Document/Graphics/named_colors.shtml
>
> Or the actual RGB values at:
>
> http://www.ncl.ucar.edu/Applications/Scripts/rgb.txt
>
> You'll see there's a color called "slate blue". You can then use the
> function "named2gba" to return the RGBA triplet for "slate blue".
>
> I've updated the "newcolor_17.ncl" example to include this new function
> (which will be in V6.2.0) and the "slate blue" color.
>
> http://www.ncl.ucar.edu/Applications/Scripts/newcolor_17.ncl
>
> 2. is it possible to overlay this netto contour with another contour line?
>
>
> To overlay another contour line, you can use the same the same "overlay"
> procedure that's used in this example, except create a line contour plot
> instead of a filled plot:
>
> ;---Set some plot options
> lres = True
>
> lres@gsnDraw = False ; Don't draw plots or advance
> lres@gsnFrame = False ; frame (need to overlay later)
>
> lres@cnInfoLabelOn = False ; Turn off info label
> lres@cnLineColor = "limegreen" ; default is foreground
> (usually black)
>
> lres@cnLineThicknessF = 3.0
> lres@cnLineDrawOrder = "PostDraw"
>
> line_contour = gsn_csm_contour(wks,x,lres)
> overlay(ovly_plot1, line_contour)
>
>
> Thank you
>
>
> On Fri, Jul 26, 2013 at 1:15 AM, Mary Haley <haley@ucar.edu> wrote:
> Xi,
>
> See the attached example and image. Is this what you need? I draw the
> contour lines in different colors so you could see them in the final
> overlay plot.
>
> What I did was to set cnFillColors for both plots, using RGBA quadruplets.
> This allows me to set the transparency levels for each color.
>
> For the first plot, I made both contour fill colors (black and white)
> fully opaque (non-transparent).
>
> For the second plot, I made black fully opaque, and white fully
> transparent.This way, when you overlay, you will only see white if both
> contour areas are white in the same locations.
>
> --Mary
>
>
> On Jul 24, 2013, at 3:24 AM, Xi Chang wrote:
>
> >
> > Hallo NCL,
> >
> > I have a question, how can i possibly create such an overlay contour
> from two different fields, let's say:
> >
> > X (contour: negative value= black, positive value= white)
> > Y (contour: negative value= black, positive value= white)
> >
> > then do an "OVERLAY X slice Y". The result of overlay product from two
> contour map will be:
> >
> > if negative values + negative values == Black
> > if positive + negative == Black
> > if negative + positive == Black
> > if positive + positive === "WHITE"
> >
> > X slice Y.
> >
> > I really appreciate for your hints.
> >
> > Xi
> > _______________________________________________
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>
>
>
>
>
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