[ncl-talk] contour lines and labels

[David Brown]

Hi Laura,
cnLineDashSegLenF only has an effect when cnLineLabelPlacementMode is
set to "constant". I'd suggest you try that first. If that does not do
what you want, your choices are using cnLineLabelDensity with either
the "randomized" or "computed" placement modes. I'd say that
"randomized" is usually a bit simpler to work with but it somewhat
depends on the contour topology. More detailed control is available
through the cnConpackParams resource but you will definitely need to
study the documentation to learn to use it.  If you are not happy with
any of your results, we might be able to help if you send us enough
code and data to reproduce your plot. (See the "report bugs" page
under the support tab).
One more point is that for the next version of NCL, the settings used
for cnLineLabelDensity may change somewhat in order to improve the
level of control it offers.
 -dave


On Fri, May 15, 2015 at 11:10 AM, Laura Fowler <laura at ucar.edu> wrote:
> Hi:
>
> Is there a way to control the number of labels per contour line. I am
> plotting a set of contours that are kind of concentric. The inner
> contour has about 8 labels while the most outer contour has only 4. Is
> there a way to decrease the number of labels in the inner contour
> (that looks pretty crowded) while about keeping the same number of
> labels in the outer contour? I tried to change the value of
> cnLineDashSegLenF but that did not do anything?
>
> Here are some of the settings I am using to draw the contour lines:
>
> res = True
> res at cnLineThicknessF   = 3.0
> res at cnLinesOn          = True
> res at cnLineLabelsOn     = True
> res at cnMonoLineColor    = True
> res at cnLineColor        = "black"
> res at cnInfoLabelOn      = False
>
> res at cnLineLabelPlacementMode   = "Computed"
> res at cnLineLabelDensityF        = 2
> res at cnLineDashSegLenF          = 0.24
> res at cnLabelMasking             = True
> res at cnLineLabelBackgroundColor = "transparent"
> res at cnLevelSelectionMode     = "ExplicitLevels"
> res at cnLevels = (/4.,6.,8.,12.,16.,20./)
>
>
> Thanks,
> Laura
>
>
>
>
>
> --
> !-------------------------------------------------------------------------------------------------------------
> Laura D. Fowler
> Mesoscale and Microscale Meteorology Division (MMM)
> National Center for Atmospheric Research
> P.O. Box 3000, Boulder CO 80307-3000
>
> e-mail: laura at ucar.edu
> phone: 303-497-1628
>
> !-------------------------------------------------------------------------------------------------------------
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