Re: Why doesn't my text show up in my plot?

Mary,

That is it. I need gsnDraw and gsnFrame to false, then call both draw(map)
and frame(xks). I was not doing the frame(xks). Without this, the ps file
was still being generated, but not the png file.

Thanks,
Craig

On Fri, Feb 28, 2014 at 10:48 AM, Mary Haley <haley@ucar.edu> wrote:

> Craig,
>
> If you set gsnFrame and gsnDraw to False, then the plot object will be
> created, but nothing will get drawn. It shouldn't matter if your output is
> going to PS, PNG, X11, PDF, or NCGM.
>
> Whenever you set these two resources to False, then in order to have the
> plot drawn correct, you need to call:
>
> draw(plot)
> frame(wks)
>
> where "plot" is whatever you used for the variable on the left side of the
> "=":
>
> plot = gsn_csm_contour_map(...)
>
> I think what's happening in your case is that if you set these two
> resources to False, and don't call "draw" and "frame", then for the "ps"
> case, you will still get a "xxxx.ps" file, but it will be blank. For the
> "png" case, you will get no file at all.
>
> Look at your PS file to see if it actually has any graphics in it. I
> won't be surprised if it doesn't.
>
> Are you actually calling "draw" and "frame" somewhere in your code?
>
> See the attached script for an example. Try commenting out the "draw" and
> "frame" calls and see what happens.
>
> --Mary
>
>
>
> On Feb 28, 2014, at 9:57 AM, Craig Tierney - NOAA Affiliate <
> craig.tierney@noaa.gov> wrote:
>
> > Mary,
> >
> > In developing an example I found the problem, but it lead to another
> issue. I had not set res@gsnFrame and res@gsnDraw to false like I had
> done in other similar commands, so I was unable to plot any additional
> objects after the call to gsn_csm_contour_map. So that is pretty obvious
> why it isn't working.
> >
> > However, this lead to another issue I had never asked about. I would
> rather be generating png files directly, and not creating ps files and
> converting them after the fact. This code was able to write directly to
> png files with:
> >
> > wks=gsn_open_wks("png",ofn);
> >
> > However, when I changed gsnFrame and gsnDraw to false, I could no longer
> create png files. I can create ps files by just changing the command above
> to use "ps".
> >
> > Should I be able to create png files directly with gsnFrame and gsnDraw
> set to false?
> >
> > If you need to see my example, please send me instructions on where to
> upload it.
> >
> > Thanks,
> > Craig
> >
> >
> >
> > On Wed, Feb 26, 2014 at 3:06 PM, Mary Haley <haley@ucar.edu> wrote:
> >
> > On Feb 26, 2014, at 1:54 PM, Craig Tierney - NOAA Affiliate <
> craig.tierney@noaa.gov> wrote:
> >
> > > Mary,
> > >
> > > I will try and come up with an example. The gsn_add_text isn't
> working either. Now, I could be using it wrong (most likely).
> > >
> > > My question is, should gsn_add_text be able to plot text outside of
> the boundary of the plot map?
> >
> > No, you can only use gsn_add_text for text inside the plot's boundaries,
> although you can do a kludgy thing of moving the text by adding extra
> spaces or carriage returns to the text string.
> >
> > --Mary
> >
> > >
> > > Thanks,
> > > Craig
> > >
> > >
> > > On Wed, Feb 26, 2014 at 1:26 PM, Craig Tierney - NOAA Affiliate <
> craig.tierney@noaa.gov> wrote:
> > > On Wed, Feb 26, 2014 at 12:45 PM, Mary Haley <haley@ucar.edu> wrote:
> > > Craig,
> > >
> > > Can you trim this down to a short but complete script that illustrates
> the problem? I can't tell from looking at the code snippet what might be
> going on.
> > >
> > >
> > > I will see what I can do. The plotting script is really 1000+ lines
> of NCL that allow me plot any dataset, from any resolution, of any
> meteorological field, and just do the right thing. This script is plotting
> a data on a icosahederal grid.
> > >
> > > There could be a maximization issue, or maybe one plot element is
> covering up another, etc.
> > >
> > > Note: generally I recommend against using gsn_text_ndc (or any of the
> gsn_xxx_ndc procedures) if you can use gsn_add_xxx instead.
> > >
> > >
> > > I was not a fan of working in NDC space, but it did help me simplify
> my code because when the scripts change domain (eg. global to conus), then
> I would have to rescale the coordinates. In NDC space and an assumption of
> where the plot ends up, I can safely tuck away the text in the corner of
> the plot.
> > >
> > > The difference, of course, is that with gsn_xxx_ndc you need to use
> NDC coordinates (coordinates from 0 to 1), whereas with the gsn_add_xxx
> functions you need to use the plot's coordinate space. Also, with
> gsn_xxx_ndc, the primitive gets drawn right in that moment and it is *not*
> attached to anything. The gsn_add_xxx function will attach the primitive to
> the plot, but not draw it. So, you have to draw the plot in order to see
> the primitive. But, the benefit is if you resize the plot, then the
> primitive will be resized automatically.
> > >
> > >
> > > I will try the gsn_add_text and see if that resolves the order issue.
> > >
> > > Craig
> > > --Mary
> > >
> > > On Feb 26, 2014, at 11:59 AM, Craig Tierney - NOAA Affiliate <
> craig.tierney@noaa.gov> wrote:
> > >
> > > > I am using ncl 6.1.2. When I try to call gsn_text_ndc before the
> call to gsn_csm_contour_map, the text displays.
> > > >
> > > > ----------------------------
> > > > ; Create a control string for the plot
> > > > cstr="Min/Max control: "+min(d1)+"/"+max(d1)+" "+"Min/Max Diff:
> "+min(data)+"/"+max(data)
> > > > print(cstr)
> > > >
> > > > ; Attach all necessary labels
> > > > txresb = True
> > > > txresb@txFontHeightF = 0.010
> > > > gsn_text_ndc(wks,cstr, 0.5, 0.1, txresb)
> > > >
> > > > ; plot the map
> > > > map = gsn_csm_contour_map(wks,data,res)
> > > >
> > > > draw(map)
> > > > -----------------------------
> > > >
> > > > When I reverse it, the text does not display.
> > > >
> > > > ----------------------------
> > > > ; Create a control string for the plot
> > > > cstr="Min/Max control: "+min(d1)+"/"+max(d1)+" "+"Min/Max Diff:
> "+min(data)+"/"+max(data)
> > > > print(cstr)
> > > >
> > > > ; plot the map
> > > > map = gsn_csm_contour_map(wks,data,res)
> > > >
> > > > ; Attach all necessary labels
> > > > txresb = True
> > > > txresb@txFontHeightF = 0.010
> > > > gsn_text_ndc(wks,cstr, 0.5, 0.1, txresb)
> > > >
> > > > draw(map)
> > > > -----------------------------
> > > >
> > > > Why is this and is there a way to enable additional debugging so
> that I could see what NCL is doing when I run into future problems like
> this?
> > > >
> > > > Thanks,
> > > > Craig
> > > > _______________________________________________
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> > >
> > >
> > >
> >
> >
>
>
>

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Received on Fri Feb 28 12:56:57 2014