Hi,
sometime ago I've shared a function circle_ll() which can draw
circle/ellipse on a plot with least effort. Please see this thread:
http://www.ncl.ucar.edu/Support/talk_archives/2012/1334.html
This function might help you.
regards,
-- *Dr Arindam Chakraborty* CAOS, IISc, Bangalore-12* * On Tue, Jul 30, 2013 at 3:29 AM, Mary Haley <haley@ucar.edu> wrote: > There's no automatic function to draw a circle on a plot. The best way to > do this currently is to use gsn_polyline or gsn_add_polyline. See the > attached sample script. > > You didn't say how you wanted to determine where to draw the circle and > how big. I just used some dummy values in this example. > > Note the circle is not perfectly round here. That's because the plot area > that I'm drawing in has a range of 24 on the Y axis, and 21 on the X axis. > > If you uncomment these lines, the circle will be perfectly round: > > ; res@trXMinF = xmin > ; res@trXMaxF = xmax > ; res@trYMinF = ymin > ; res@trYMaxF = ymax > > > > --Mary > > > > On Jul 27, 2013, at 4:47 PM, 雷霆 <leiting2002@hotmail.com> wrote: > > Dear NCLers, > For several curves plotted by gsn_xy, I want to draw,say, an empty circle > to > wrap a few points in the former. I checked up with the ncl-talk archive, > seems, to draw a marker of cycles can do this. > However, that needs much tuning of the radius of the marker (circles, > here) to do it. > Are there any simpler methods in NCL to do this? > Your help is appreciated. > Best, > Ting Lei > _______________________________________________ > ncl-talk mailing list > List instructions, subscriber options, unsubscribe: > http://mailman.ucar.edu/mailman/listinfo/ncl-talk > > > > _______________________________________________ > ncl-talk mailing list > List instructions, subscriber options, unsubscribe: > http://mailman.ucar.edu/mailman/listinfo/ncl-talk > >
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Received on Tue Jul 30 05:39:47 2013
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