[gradsusr] Filling entire plot area issue..

[Jennifer Adams]

Here is what I would do: 

1. set parea to the full page: 'set parea 0 11 0 8.5'

2. Constrain the domain so that the desired area is shown. This can be done by limiting the lat/lon dimension environment, by using 'set mpvals', or both. GrADS will fill the plot area as best it can while still maintaining the proper aspect ratio -- don't worry about whether the plot stretches to the very edges of the page, just get the display inside the frame to be the way you want it. 

3. call 'q gxinfo' and parse the output to get the size of the frame. E.g. 

ga-> q gxinfo               
Last Graphic = Contour
Page Size = 11 by 8.5
X Limits = 0.5 to 10.5
Y Limits = 1.25 to 7.25
Xaxis = Lon  Yaxis = Lat
Mproj = 2

Note the The display is 10 inches in X (10.5 minus 0.5) and 6 inches in Y (7.25-1.25). This means your plot has an aspect ratio of 1.6667. 

4. Quit grads, then restart with "grads -a 1.6667" instead of using -l or -p. 

5. check the 'q gxinfo' output again: 

ga-> q gxinfo          
Last Graphic = Contour
Page Size = 11 by 6.59987
X Limits = 1.25011 to 9.74989
Y Limits = 0.75 to 5.84987
Xaxis = Lon  Yaxis = Lat
Mproj = 2

6. Note the different page size. Use these numbers to change your parea command:
'q gxinfo'
psz=sublin(result,2)
xsz=subwrd(psz,4)
ysz=subwrd(psz,6)
'set parea 0 'xsz' 0 'ysz-0.0001
Rounding issues force me to reduce the y size by a tiny bit in order to avoid the message: 'parea values beyond page limits.' 

7. Now redo your display and you'll see that your plot fills the entire window. Here is a sample:




--Jennifer





On Feb 27, 2014, at 3:16 PM, L.B. wrote:

> I will take a look at the mpvals. I know you can zoom in by reducing the lat/lon pairs - guess I should have said I want that full domain plotted :P
> 
> William (L.B.) LaForce
> Meteorologist
> Central Michigan University '13
> www.tornadoinsanity.com
> 
> 
> On Thu, Feb 27, 2014 at 3:00 PM, Stephen McMillan <smcmillan at planalytics.com> wrote:
> William,
> You can "zoom in" by reducing the lat and lon ranges before you display the variable.  Also, try using 'set mpvals...' (see http://grads.iges.org/grads/gadoc/gradcomdsetmpvals.html) to specify which areas you wanted included in the plot.
> Stephen Mc
> 
> 
> On Thu, Feb 27, 2014 at 2:42 PM, L.B. <bcbass2989 at gmail.com> wrote:
> Hello all,
> 
> I have been having an issue of trying to fill the entire plot area. Usually the extra white space is used for text and such, but in my case I want to fill the entire plot area (or most of it) and get rid of as much white space as possible. I have played around with various values for vpage and parea as well as the image size output (so it is NOT distorted), and it just seems to re-scale the image, and not let me fill the entire area. Ideally it would be nice to set your parea>vpage, but that's not possible. I have posted an example image below. I made the background black to show you all the excess space. Now obviously the image is not rectangular, and I have cropped the left and the right side, but how can I get rid of that excess on the top and bottom without using an external utility to crop it after the fact?
> 
> Thanks.
> 
> William (L.B.) LaForce
> Meteorologist
> Central Michigan University '13
> www.tornadoinsanity.com
> 
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--
Jennifer M. Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
111 Research Hall, Mail Stop 2B3
George Mason University
4400 University Drive
Fairfax, VA 22030 





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