[gradsusr] Setting color bar for animation
Goodson,Ron [Edm]
Ron.Goodson at EC.gc.ca
Wed Mar 23 14:29:57 EDT 2011
yes ... you must redo clevs, ccols (if you use them) for each display. That's just grads. It say it right in the documentation
------------
set clevs
Usage Notes
1. Contour levess are reset with every exectuion of clear or display.
----------------------
ron
Ron Goodson
Prairie and Northern Meteorological Service of Canada Science Section Unité des Sciences, Région des Prairies et du Nord, Service Météorologique du Canada
Environment Canada
Room 200 ; 4999 - 98 Avenue
Edmonton Alberta T6B 2X3 Environnement Canada
Pièce 200 ; 4999 - 98 Avenue
Edmonton Alberta T6B 2X3
Telephone | Téléphone 780 951 8791
Email | Courriel ron.goodson at ec.gc.ca
________________________________
From: gradsusr-bounces at gradsusr.org [mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Clay Blankenship
Sent: March 23, 2011 12:23 PM
To: GrADS Users Forum
Subject: Re: [gradsusr] Setting color bar for animation
Yes, that is correct. Ideally, I would specify the range and not have to pick the exact colors. (I'll go back and do that later if necessary.) Just specifying
clevs initially works fine on my first plot. If I 'd' the variable, and then 'cbar', I get the range of values I want. However if I advance the time one step,
and do the 'd var' and 'cbar' again, I get a different value range. It appears that I have to set clevs every time I do a plot. How is it getting reset?
(And I still haven't figured out how to print out the current clevs and ccols.)
Clay
On Mar 23, 2011, at 11:23 AM, Jeffrey Duda wrote:
Clay,
In your original thread post, you asked how to plot a consistent range and set of colors for each time slice of data you want to
display. Is that correct? If so, then all you need to do is use the "set clevs" and "set ccols" commands before you display the
data. Unless you want to adjust the range of contours and colors so that they fit the maximum and minimum value in the domain
each time you display data, then it really is that simple. Simple code to do this would be:
'set dbuff on'
t = 1
'set gxout shaded'
while (t <= 5)
'set t 't
'draw title Temperature'
'set clevs A B C D E F G H I ...'
'set ccols 17 18 29 20 21 22 23 ...'
'd t'
'cbar'
'swap'
t = t + 1
endwhile
This example assumes you have defined color numbers 17, 18, 19, ... and so on using the "set rgb" command prior to this section
of code. It might be easier just to write a separate script file that defines the colors, then issues the "set clevs" and
"set ccols" command. Then you could replace some of the code above with something like
'set dbuff on'
t = 1
'set gxout shaded'
while (t <= 5)
'set t 't
'draw title Temperature'
'run mycolorscript.gs'
'd t'
'cbar'
'swap'
t = t + 1
endwhile
where you created the script called mycolorscript.gs. I have sample animated gifs stored at http://www.meteor.iastate.edu/~jdduda/sfc_div.gif
and http://www.meteor.iastate.edu/~jdduda/radar3.gif that show how I used those command lines and a while loop to create the
frames necessary for an animation, then used gifsicle to make the animated gif. Gifsicle is another way to make animations,
but you have to use it outside of Grads, and you'd need to make the images first (i.e., the frames of the animation).
I hope this clarifies things.
Jeff Duda
On Wed, Mar 23, 2011 at 10:42 AM, Clay Blankenship <clay.b.blankenship at nasa.gov> wrote:
OK, from the command line I can use make_clevs to specify any range of levels and plot and get the color bar. But both of my scripts dd.gs (a script to plot, specify a range, and make a color bar) and ani.gs (animation) do not plot the full color bar when I specify the range with script arguments. I can't figure out what's going on...
Also, I am still looking for a way to display the current ccols and clevs. Do you have to use 'q shades'?
One more thing, this animation script regulates its speed by redrawing the plot a certain number of times; is there a better way to do that?
Thanks,
Clay
****dd.gs***********
function dd (args)
*Plot a variable and its color scale.
* dd variable [ -cmin minimum value ]
* [ -cmax maximum value ]
* [ -cint color scale ]
variable=subwrd(args,1)
ccint=''
ccmin=''
ccmax=''
string=''
space=' '
n=2
while(n<9)
idx=subwrd(args,n)
opt=subwrd(args,n+1)
if(idx='');break;endif
if(idx='-cint');ccint=opt;endif
if(idx='-cmin');ccmin=opt;endif
if(idx='-cmax');ccmax=opt;endif
if(idx='-string');string=opt;endif
n=n+2
endwhile
'c'
'set gxout shaded'
if(ccint!=''); 'set cint 'ccint;endif
if(ccmin!=''); 'set cmin 'ccmin;endif
if(ccmax!=''); 'set cmax 'ccmax;endif
if(ccmin!=''); if(ccmax!=''); 'set rbrange 'ccmin ' 'ccmax; endif;endif
*CBB 3/22/11 set the levels
'make_clevs ' cmin cmax cint
'd 'variable
*Add date and user-input string
'q time'
say result
cctime=subwrd(result,3)
coln=substr(cctime,3,1)
if coln = ':'
dmy =substr(cctime,7,9)
else
dmy =substr(cctime,1,12)
day =substr(cctime,1,3)
my =substr(cctime,4,9)
*dmy =substr(cctime,4,9) *cbb changed
endif
* 'draw title 'dmy space string
'draw title 'day space my space string
'q shades'
'cbar2'
****END***********
***ani.gs************
* Display animation
* ga> run ani variable [ -I slowness (default=10) ]
* [ -cint, -ci contour interval ]
* [ -cmin, -mn minimum contour level ]
* [ -cmax, -mx maximum contour level ]
* ex. ga> run ani t-t.2 -ci 0.1 -mn -0.5 -I 5 -cmax 0.3
* >>>> plot (t-t.2) with slowness=5, contour_interval=0.1
* minimum contour level=-0.5, maximum contour level=0.3
*
* Nov. 9, 1999 Masami Nonaka
*
function ani (args)
variable=subwrd(args,1)
slow=''
ccint=''
ccmin=''
ccmax=''
cbar=''
n=2
while(n<10000)
idx=subwrd(args,n)
opt=subwrd(args,n+1)
if(idx='');break;endif
if(idx='-I');slow=opt;endif
if(idx='-Int');slow=opt;endif
if(idx='-cint');ccint=opt;endif
if(idx='-cmin');ccmin=opt;endif
if(idx='-cmax');ccmax=opt;endif
if(idx='-ci');ccint=opt;endif
if(idx='-mn');ccmin=opt;endif
if(idx='-mx');ccmax=opt;endif
n=n+2
endwhile
defaultslow=10
if(slow=''); slow=defaultslow;endif
'q dims'
say result
aline=sublin(result,5)
cctime1=subwrd(aline,11)
cctime2=subwrd(aline,13)
tmin=substr(cctime1,1,9)
tmax=substr(cctime2,1,9)
it=tmin
'set dbuff on'
while (it <=tmax)
'set t 'it
i=0
while (i <slow)
if(ccint!=''); 'set cint 'ccint;endif
if(ccmin!=''); 'set cmin 'ccmin;endif
if(ccmax!=''); 'set cmax 'ccmax;endif
if(ccmin!=''); if(ccmax!=''); 'set rbrange 'ccmin ' 'ccmax; endif;endif
*CBB 3/22/11 setting max min clevs
'make_clevs ' cmin cmax cint
'display 'variable
'run date.gs'
'query shades'
shdinfo = result
if(subwrd(shdinfo,1)!='None');'run fcbar.gs';endif
'swap'
i=i+1
endwhile
it=it+1
endwhile
'set t ' tmin ' ' tmax
****END***********
On Mar 22, 2011, at 5:23 PM, Goodson,Ron [Edm] wrote:
I see in my original note I mislead you .. when I said I do my make_clevs.gs before cbar. As was noted by Jeffrey . the settings of clevs, ccols (all that stuff) must happen before the display of the variable. So swap those two lines of "display" and "make_clevs".
The other thing I usually do right at the start of my programs (and only has to be done once .. unlike settings clevs, ccols which must be done before each display) is to setup some custom colours through "set rgb" (one entrie per colour) and rbcols (to set the order of the colours). You don't need to do this if you are using the GrADS standard scheme of 16 colours.
ron
________________________________
From: gradsusr-bounces at gradsusr.org [mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Clay Blankenship
Sent: March 22, 2011 4:05 PM
To: GrADS Users Forum
Subject: Re: [gradsusr] Setting color bar for animation
OK, that make_clevs works for me when I do a simple 'd' on my variable, but when I try to use a little fancier script (not even an animation, just trying to pass the range on the command line), I lose the min and max values.
If I do:
c
make_clevs 0 2 0.2
d soilwat5
cbar
I get a colorbar from 0 to 2 in steps of .2, even though the variable range is 0 to 1 (so far, so good).
If I do:
dd soilwat5 -cmin 0 -cmax 2 -cint 0.2
I get a colorbar from 0 to 1 in steps of 0.2. The colors are the same for the different ranges, it just doesn't show the ones above 1. Is this because clevs are set and ccols are not? I was hoping ccols would get set automatically like it does when you don't specify levels.
This happens whether or not I use the make_clevs line in the following script.
BTW, this seems really basic, but I can't figure out how to see the current values of ccols and clevs.
cbar is getting its ccols and clevs from 'q shades', but it doesn't react to ccols and clevs until a plot has been made.
Script follows.
Thanks for the help,
Clay
--
Clay Blankenship * USRA Research Scientist
clay.b.blankenship at nasa.gov * 256-961-7638
320 Sparkman Drive * Huntsville, AL 35805 USA
National Space Science and Technology Center at NASA-MSFC/UAH
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--
Jeff Duda
Iowa State University
Meteorology Graduate Student
3134 Agronomy Hall
www.meteor.iastate.edu/~jdduda
<ATT00001.txt>
--
Clay Blankenship * USRA Research Scientist
clay.b.blankenship at nasa.gov * 256-961-7638
320 Sparkman Drive * Huntsville, AL 35805 USA
National Space Science and Technology Center at NASA-MSFC/UAH
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