[ncl-talk] Contour fill transparency not working with RasterFill mode

[Mary Haley]

I admit, I don't know what "the larger value" means in this case.  Dave
would know, but I think he's out of the office for a few days. Did setting
cnGridBoundFillColor fix anything?

If not, is it possible for you to provide the script/data? You can do this
offline if necessary. I don't think we have any unstructured examples like
this that have missing data.

Thanks,

--Mary




On Fri, Sep 29, 2017 at 9:47 AM, Karin Meier-Fleischer <
meier-fleischer at dkrz.de> wrote:

> cnMissingValFillColor:
>
> ...
> Also note that the triangular mesh contouring algorithm does not
> distinguish between missing value areas and areas outside the grid
> boundary. Therefore if *ContourPlot*
> <http://ncl.ucar.edu/Document/HLUs/Classes/ContourPlot.shtml> is given
> non-rectangular data or *trGridType*
> <http://ncl.ucar.edu/Document/Graphics/Resources/tr.shtml#trGridType> is
> explicitly set to TriangularMesh, the color index used will be the larger
> value of those assigned to the resources *cnMissingValFillColor*
> <http://ncl.ucar.edu/Document/Graphics/Resources/cn.shtml#cnMissingValFillColor>
> and *cnGridBoundFillColor*
> <http://ncl.ucar.edu/Document/Graphics/Resources/cn.shtml#cnGridBoundFillColor>.
>
>
> Maybe Mary, Dave or Rick can say somthing more about it.
>
> -Karin
>
> Am 29.09.17 um 17:23 schrieb Guido Cioni:
>
> Yep, and I still get the same behaviour :(
>
> I also thought that was the case but then I read that "Transparent" is the
> default option for cnMissingValFillColor.
>
> Maybe it has something to do with the unstructured grid that I'm using?
>
> On 29. Sep 2017, at 17:14, Karin Meier-Fleischer <meier-fleischer at dkrz.de>
> wrote:
>
> Hi Guido, :-)
>
> have you tried the cnMissingValFillColor resource to set the color for
> missing value?
>
>   ResC at cnFillPalette         = cmap_r
>   ResC at cnMissingValFillColor = 0
>
> Bye,
> Karin
>
> Am 29.09.17 um 16:55 schrieb Guido Cioni:
>
> Hi,
> I'm trying to plot filled contour of wind speed overlaid on a map. In
> order to mask small values of winds I've both masked the original data and
> set the first color of the color palette as transparent, i.e.
>
> cmap_r=read_colormap_file("wind_17lev")
> cmap_r(0,3)=0.0
> ResC at cnFillPalette= cmap_r
>
> However, when drawing with ResC at cnFillMode = "RasterFill", this causes
> the Missing Values to be coloured with white instead that being
> transparent, as you can see in the attached picture.
>
>
>
> Going back to old discussion this seems to be an old problem that was
> fixed in 6.2.0. Am I wrong?
>
> I'm attaching the script that I'm using, although it is not 100% clean.
> Cheers
>
>
>
> Guido Cioni
> http://guidocioni.altervista.org
>
>
>
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> Guido Cioni
> http://guidocioni.altervista.org
>
>
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