[ncl-talk] Remove first box in the LabelBar

[Mary Haley]

Lillian,

The solution you came up with is pretty clever!

Another method is to set all values below some threshold value that you
don't want contoured to missing. For example:

threshold_val = 1.0
data = where(data.lt.threshold,data at _FillVaue,data)

This will set all values < 1.0 to missing, and hence you won't get any
filled contours in these locations.

Your solution works well, too. I will try to come up with some examples on
our web page, because this a common question.

--Mary


On Sun, May 29, 2016 at 10:26 PM, 林勤芳 <cflin at cwb.gov.tw> wrote:

> Hi Mary,
>
>
>
> Thanks for your reply. The problem is solved by your suggestion.
>
>
>
> The test1.png is a contour plot of precipitation. The first box is set as
> transparent, which will look like background color white in the labelbar.
> However, there is no white color in the contour plot. That’s why we want to
> remove the first box and keep all the label values.
>
>
>
> After including the following steps, the first box will be removed in
> test2.png:
>
> 1.      Add one more extremely large value in cnLevels and cnFillColors.
>
> 2.      Set cnLabelBarEndStyle = “ExcludeOuterBoxes”
>
> 3.      Set the last string of lbLabelStrings as blank.
>
>
>
> Lillian
>
>
>
> *From:* Mary Haley [mailto:haley at ucar.edu]
> *Sent:* Saturday, May 28, 2016 12:40 AM
> *To:* 林勤芳
> *Cc:* ncl-talk at ucar.edu
> *Subject:* Re: [ncl-talk] Remoce first box in the LabelBar
>
>
>
> ​Hi Lillian,
>
>
>
> Is this a labelbar that's part of a contour or vector plot, or just one
> that you are trying to create from scratch?
>
>
>
> Generally, if somebody is trying to remove that first box, then my
> suggestion is to change your contour or vector levels so that first level
> is not included.  But, I need to know more about what that first box
> represents.  Is it just a white box that you are effectively using as a way
> to not draw any colored contours or vectors below a certain level?
>
>
>
> You might want to check out some of our labelbar examples:
>
>
>
> http://www.ncl.ucar.edu/Applications/labelbar.shtml
>
>
>
> In particular, example lb_12.ncl might be useful, or lb_5.ncl, which shows
> you how to chuck the labelbar that comes with the contour plot, and just
> create your own.
>
>
>
> --Mary
>
>
>
>
>
> On Wed, May 25, 2016 at 3:11 AM, 林勤芳 <cflin at cwb.gov.tw> wrote:
>
> Hi NCL group,
>
>
>
> I’m trying to remove the first box in the LabelBar. It seems like the
> lbBoxFractions function could work. But I didn’t success. Could you help me
> to check the following scripts?
>
>
>
> res at lbBoxCount = 3
>
> res at lbBoxSizing = ”Explicitsizing”
>
> res at lbBoxFractions = (/0.0, 0.0, 0.5, 1.0/)
>
>
>
> Thank you,
>
>
>
> Lillian
>
>
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