| Thanks for this clarification and reply Ansley - managed to get both of your methods to work and produce what I wanted...
...to a point. Probably an exceedingly simple question, but how do I adapt the "go polymark" version to a plot where I've changed the x and y limits of the graph? E.g.
fill/hlimits=-180:180:50/vlimits=-90:90:20 my_var go polymark poly/pal=black/over xsequence(lon), xsequence(lat), xsequence(my_mask), circle, 0.2
results in the polygons being drawn off the bottom right of the map, when I use
let lon = x[gx=my_var] + 0*y[gy=my_var] let lat = 0*x[gx=my_var] + y[gy=my_var]
(The above definitions of lon and lat work fine for "plot/vs")
Also, one further question: is there a reason why the tiny_squares pattern produced different results in the hardcopy versus the screen (see attachments in my previous email). If I understand from your email, the pattern files should work fine in the standard interactive mode....
Cheers,
Paul
On Feb 3, 2009, at 11:12 AM, Ansley Manke wrote: Hi all, The patterns are a built-in feature of the underlying graphics package xgks, which Ferret uses for most of its graphics. They're unfortunately not something the user can create more of. If you look at what's in the pattern files, you'll see that they contain only the name of the pattern; for instance, % cat $FER_DIR/ppl/fish_scale.pat 1 FISH_SCALE The pattern capability works in default Ferret interactive mode and in batch metafile mode, and in interactive mode you can do a FRAME/FILE=filename.gif which captures the screen output in a gif file. The patterns are not available in gif mode or in the batch mode started with a postscript filename, because that mode actually calls a separate underlying graphics package, the GD library. So, patterns work in these modes: > ferret
(where you get hardcopy by setting a metafile, or executing a FRAME/file=name.gif command)
> ferret -batch my_metafile.plt
> ferret -batch
(with hardcopy by setting a metafile)
but not with these: > ferret -gif
> ferret -batch my_psfile.ps
One way to get this effect is by overlaying a set of points plotted with PLOT/VS/OVER or with polygons. These look good when done as metafiles, or when produced in gif mode: ! Define a mask for a region that we will fill in with points
yes? use coads_climatology
yes? let mask1 = if sst gt 25 then 1
yes? let mask = if mask1 le 30 then 1
! points at all the coordinate locations; these could be defined differently for
! more or fewer dots, see the end
yes? let lon = x[gx=sst] + 0*y[gy=sst]
yes? let lat = 0*x[gx=sst] + y[gy=sst]
yes? set win/siz=1.5
yes? shade/L=1 sst
yes? plot/vs/over/L=1/sym=dot mask* lon, mask*lat
yes? frame/file=dots.gif
! Or use polygons:
yes? shade/L=1 sst
yes? go polymark poly/pal=black/over xsequence(lon), xsequence(lat), xsequence(mask[L=1]), circle, 0.2
yes? frame/file=circles.gif
To make fewer dots:
yes? let nx = `sst,return=isize`
yes? let ny = `sst,return=jsize`
yes? let lon = x[gx=sst,i=1:`nx`:2] + 0*y[gy=sst,j=1:`ny`:2]
yes? let lat = 0*x[gx=sst,i=1:`nx`:2] + y[gy=sst,j=1:`ny`:2]
yes? let mask1 = if sst[i=1:`nx`:2,j=1:`ny`:2] gt 25 then 1
Paul Young wrote: Hi all,
I'm trying to produce a difference plot where I highlight areas of significant difference - sort of like this plot from the recent IPCC report:
I've managed to get something similar using a "shade/over/pattern=" command, but none of the patterns has a stippling effect, or lets me edit them in Illustrator. Has anyone succeeded with anything like this in ferret before? EIse, is it possible to write my own pattern file to get the stippling?
Thanks for any help,
Paul
----- Paul Young Chemistry & Climate Processes Chemical Sciences Division NOAA/ESRL 325 Broadway R/CSD8 Boulder CO 80305 USA
-----
Paul Young
Chemistry and Climate Processes Chemical Sciences Division NOAA Earth System Research Laboratory 325 Broadway R/CSD8 Boulder CO 80305-3328 USA
Tel: +1 303-497-4711 Fax: +1 303-497-5686 |
