Re: transparent background in contour map

Untested -- what if you tried:

     mpres@cnMissingValFillColor = (/ 0., 0., 0., 0. /)

Let us know if this doesn't work and I'll investigate further what it
takes.

Rick

On Tue, 19 Mar 2013 13:16:31 -0400
  Ruben van Hooidonk <rubski@gmail.com> wrote:
> Hi,
>
> I'm trying to plot a map where all locations without values
>(_FillValue)
> are transparent. I'm having trouble setting the background color to
> transparent.
>
> I'm using NCL 6.1.2 and I have tried using cellfill and setting:
> mpres@cnMissingValFillColor = "transparent", but then the missing
>locations
> are plotted using the background color.
>
> I've tried to set the background color to transparent by defining my
>own
> colormap:
>
> colors =
>(/"transparent","black","White","RoyalBlue","LightSkyBlue"/)
> gsn_define_colormap(wks, colors)
>
> That resulted in:
> warning:CvtStringGenArrayToCmap:Unable to find rgb of "transparent",
>using
> white
>
> or by setting wks values:
> setvalues wks
> "wkBackgroundColor" : "transparent"
> "wkForegroundColor" : "black"
> end setvalue
>
> This resulted in:
> fatal:NhlCvtStringGenArrayToFloatGenArray:Unable to Convert
>"transparent"
> warning:Error retrieving resource wkBackgroundColor from args -
>Ignoring Arg
>
>
> Is it possible to plot locations with missing data as transparent?
>
> Would this work with rasterfill?
>
> Thanks,
>
> Ruben

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Received on Tue Mar 19 11:24:36 2013