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August 1, 2011 21:56
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#-------------------------------------------------------------------------- | |
# | |
# Copyright (C) 2007-2008 by Arlindo da Silva <dasilva@opengrads.org> | |
# All Rights Reserved. | |
# | |
# This program is free software# you can redistribute it and/or modify | |
# it under the terms of the GNU General Public License as published by | |
# the Free Software Foundation# using version 2 of the License. | |
# | |
# This program is distributed in the hope that it will be useful, | |
# but WITHOUT ANY WARRANTY# without even the implied warranty of | |
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
# GNU General Public License for more details. | |
# | |
# You should have received a copy of the GNU General Public License | |
# along with this program# if not, please consult | |
# | |
# http://www.gnu.org/licenses/licenses.html | |
# | |
# or write to the Free Software Foundation, Inc., 59 Temple Place, | |
# Suite 330, Boston, MA 02111-1307 USA | |
# | |
#------------------------------------------------------------------------ | |
""" | |
This module defines "magic commands" for using GrADS interactively | |
from within iPython. This module is usually imported from the | |
configuration file "ipythonrc-grads". At any time, on-line help is | |
available with these commands: | |
help(ipygrads) This document | |
qref PyGrADS quick reference | |
examples Some PyGrADS examples | |
Based on command line arguments supplied by the user, the top level | |
script "pygrads" defines key environments variables necessary for this | |
module to start a GrADS connection, defining the global object "ga". | |
You can use "ga" to interact with GrADS directly: | |
ga("q config") | |
However, a number of shortcuts are provided so that rarely one needs | |
to explicitly type "ga.cmd(...)". The following generic GrADS commands | |
are available: | |
clear/c, define, disable, display/d, draw, enable, | |
Open/o, Print/pp, printim/pim, Set/s, query/q, reinit | |
Notice that some commands (e.g., "Open") are capitalized to avoid | |
conflict with standard Python keywords. | |
In addition, any generic GrADS command can be entered by starting the | |
line with a period and a space ('. '), for example example | |
. open model.ctl | |
. display ps | |
The following convenience aliases are provided: | |
cb run cbarn (for color bar script) | |
sh set gxout shaded | |
yat run gxyat | |
These shortcuts run specific methods from module "grads" on the GrADS | |
object "ga": | |
dd $name runs the "imp" method, displaying a NumPy array in | |
GrADS; this is equivalent to | |
ga.imp('<display>',$name) | |
eof $name compute EOS using Singular Value Decomposition; the | |
*time* dimension contains the eofs; this equivalent to: | |
$name,$name_d,$name_c = ga.eof('$name') | |
ii $name runs the "imp" method, importing a NumPy array into | |
GrADS; this is equivalent to | |
ga.imp("$name",$name) | |
oo $fname runs the "open" method, setting "fh" | |
qq $what runs the "query" method, setting "qh" | |
xx $name runs the "exp" method, returning a NumPy array and an | |
associated grid with coordinate information. | |
This magic command is equivalent to | |
$name = ga.exp("$name") | |
$lon = $name.grid.lon | |
$lat = $name.grid.lat | |
$lev = $name.grid.lev | |
$time = $name.grid.time | |
The shortcuts "dd/ii/xx" are somewhat limited interfaces to the | |
"imp"/"exp" methods as they do not work on expressions; use | |
"ga.imp()"/"ga.exp()" directly for a more flexible alternative. | |
For additional information on these and other methods, consult the | |
documnentation for the main classes: | |
help('grads') | |
help('GrADS') | |
help('GaNum') | |
help('GaLab') | |
help('gacm') | |
""" | |
__version__ = '1.0.6' | |
from grads import * | |
import os | |
if HAS_GALAB: | |
try: | |
from mpl_toolkits.basemap import cm as bacm | |
except: | |
try: | |
from matplotlib.toolkits.basemap import cm as bacm | |
except: | |
print "Cannot load basemap colormaps (bacm)" | |
from IPython import InteractiveShell | |
ip = InteractiveShell.instance() | |
def grads_ (self, arg=' '): | |
ip.ex("from grads import GrADS; ga=GrADS(%s)"%arg) | |
def gradsc (self, arg): | |
ip.ex("from grads import GrADS; ga=GrADS(Bin='gradsc',%s)"%arg) | |
def gradsnc (self, arg): | |
ip.ex("from grads import GrADS; ga=GrADS(Bin='gradsnc',%s)"%arg) | |
def gradshdf (self, arg): | |
ip.ex("from grads import GrADS; ga=GrADS(Bin='gradshdf',%s)"%arg) | |
def gacbarn (self,arg): | |
ip.ex("ga.cmd('run cbarn')") | |
def gaclear (self,arg): | |
ip.ex("ga.cmd('clear')") | |
def gacmd (self, arg): | |
ip.ex("ga.cmd('%s')"%arg) | |
def gadefine (self, arg): | |
ip.ex("ga.cmd('define %s')"%arg) | |
def gaenable (self, arg): | |
ip.ex("ga.cmd('enable %s')"%arg) | |
def gadisable (self, arg): | |
ip.ex("ga.cmd('disable %s')"%arg) | |
def gadisplay (self, arg): | |
ip.ex("ga.cmd('display %s')"%arg) | |
def gaquery (self, arg): | |
ip.ex("ga.cmd('query %s')"%arg) | |
def gapim (self, arg): | |
ip.ex("ga.cmd('printim %s')"%arg) | |
def gayat (self, arg): | |
ip.ex("ga.cmd('gxyat %s')"%arg) | |
def gapgx (self, arg=' '): | |
ip.ex("ga.cmd('print %s')"%arg) | |
def gaopen (self, arg): | |
ip.ex("ga.cmd('open %s')"%arg) | |
def gaOpen (self, arg): | |
ip.ex("fh=ga.open('%s')"%arg) | |
def gaQuery (self, arg): | |
ip.ex("qh=ga.query('%s')"%arg) | |
def gaqref (self, arg): | |
text = """ | |
Basic GrADS commands: | |
clear/c, define, disable, display/d, draw, enable, | |
Open/o, Print/pp, printim/pim, Set/s, query/q, reinit | |
. $cmd executes any GrADS command $cmd | |
Convenient aliases: | |
cb run cbarn (for color bar script) | |
sh set gxout shaded | |
yat run gxyat | |
GrADS Methods: | |
dd $name runs the "imp" method, displaying a NumPy array in | |
GrADS; this is equivalent to | |
ga.imp('<display>',$name) | |
eof $name compute EOS using Singular Value Decomposition; the | |
*time* dimension contains the eofs; this equivalent to: | |
$name,$name_d,$name_c = ga.eof('$name') | |
ii $name runs the "imp" method, importing a NumPy array into | |
GrADS; this is equivalent to | |
ga.imp("$name",$name) | |
oo $fname runs the "open" method, setting "fh" | |
qq $what runs the "query" method, setting "qh" | |
xx $name runs the "exp" method, returning a NumPy array and an | |
associated grid with coordinate information. | |
This magic command is equivalent to | |
$name = ga.exp("$name") | |
$lon = $name.grid.lon | |
$lat = $name.grid.lat | |
$lev = $name.grid.lev | |
$time = $name.grid.time | |
""" | |
ip.ex('print """%s"""'%text) | |
def gaexample (self, arg): | |
text = """ | |
Open a file and display a variable: | |
[1] ga-> q config | |
[2] ga-> o model | |
[3] ga-> d ts | |
[4] ga-> . draw title Surface Temperature (Kelvin) | |
Export variable "ts", change units in python, and display it in GrADS: | |
[] ga-> xx ts | |
[] ga-> ts = ts - 273 | |
[] ga-> c | |
[] ga-> sh | |
[] ga-> dd ts | |
[] ga-> cb | |
[] ga-> . draw title Surface Temperature (Celsius) | |
Display the modified variable in Python with Matplotlib: | |
[] ga-> contourf(lon,lat,ts) | |
[] ga-> title('Surface Temperature (Celsius)') | |
[] ga-> figure(2) | |
[] ga-> plot(lat,ts[:,0])) | |
[] ga-> title('Surface Temperature (Celsius) at lon=0') | |
Export an expression, change it in Python, and import it back: | |
[] ga-> . set lev 300 | |
[] ga-> uv = ga.exp('ua*ua+va*va') | |
[] ga-> speed = sqrt(uv) | |
[] ga-> ii speed | |
[] ga-> d speed | |
[] ga-> . draw title Wind Speed | |
[] ga-> cb | |
If all you wanted to do was to plot the wind speed, you can do this directly, | |
without nthe need to explicitly importing it first: | |
[] ga-> dd speed | |
[] ga-> . draw title Wind Speed | |
[] ga-> cb | |
If you have Matplotlib with the Basemap toolkit installed, you can do | |
most of your plotting in python. Shaded contours can be produced with | |
the command: | |
[] ga-> ga.contourf('ts') | |
[] ga-> title('Surface Temperature') | |
If instead you would like a continuous color scale do this | |
[] ga-> clf() | |
[] ga-> ga.imshow('ts') | |
If all you want is a plain image covering all of your graphics window | |
to later be exported to GoogleEarth then | |
[] ga-> clf() | |
[] ga-> ga.implain('ts') | |
A pseudo-color plot, just like one would obtain with "set gxout grfill", | |
can be produced with | |
[] ga-> clf() | |
[] ga-> ga.pcolor('ts') | |
Here is how to plot a variable on a blue marble background | |
[] ga-> ga.blue_marble('on') | |
[] ga-> s lon -180 180 | |
[] ga-> ga.imshow('ua') | |
[] ga-> title('Zonal Wind') | |
You can also select your map projection, e.g. | |
[] ga-> ga.basemap('npo') | |
[] ga-> ga.contour('zg(lev=300)') | |
[] ga-> title('300 hPa Heights') | |
If in any moment you would like to save the graphics window just type | |
[] ga-> savefig('myfile.png') | |
For more information type: | |
[] ga-> help galab | |
[] ga-> help pylab | |
Terminating your session: | |
[] quit() | |
Computing EOFs (experimental): | |
% pygrads slp_djf.nc | |
[] ga-> s t 1 41 | |
[] ga-> eof djfslp | |
[] ga-> contourf(lon,lat,djfslp[0,:,:]) | |
[] ga-> s t 1 | |
[] ga-> sh | |
[] ga-> dd djfslp | |
[] ga-> . draw title NAO Pattern | |
""" | |
ip.ex('print """%s"""'%text) | |
def gareinit (self,arg): | |
ip.ex("ga.cmd('reinit')") | |
def gashaded (self,arg): | |
ip.ex("ga.cmd('set gxout shaded')") | |
def gaset (self, arg): | |
ip.ex("ga.cmd('set %s')"%arg) | |
def gax (self, arg): | |
ip.ex("%s = ga.exp('%s');lon=%s.grid.lon; lat=%s.grid.lat;lev=%s.grid.lev;time=%s.grid.time"%(arg,arg,arg,arg,arg,arg)) | |
def gaeof (self, arg): | |
ip.ex("%s, %s_s, %s_pc = ga.eof('%s');lon=%s.grid.lon; lat=%s.grid.lat;lev=%s.grid.lev;time=%s.grid.time"%(arg,arg,arg,arg,arg,arg,arg,arg)) | |
def gai (self, arg): | |
ip.ex("ga.imp('%s',%s)"%(arg,arg)) | |
def gad (self, arg): | |
ip.ex("ga.imp('<display>',%s)"%(arg)) | |
# Expose the magic commands | |
ip.define_magic('grads', grads_) | |
ip.define_magic('gradsc', gradsc) | |
ip.define_magic('gradsnc', gradsnc) | |
ip.define_magic('gradshdf',gradshdf) | |
ip.define_magic('cb', gacbarn) | |
ip.define_magic('c', gaclear) | |
ip.define_magic('clear', gaclear) | |
ip.define_magic('define', gadefine) | |
ip.define_magic('d', gadisplay) | |
ip.define_magic('display', gadisplay) | |
ip.define_magic('enable', gaenable) | |
ip.define_magic('examples', gaexample) | |
ip.define_magic('disable', gadisable) | |
ip.define_magic('.', gacmd) | |
ip.define_magic('Open', gaopen) | |
ip.define_magic('o', gaopen) | |
ip.define_magic('oo', gaOpen) | |
ip.define_magic('open', gaopen) | |
ip.define_magic('pim', gapim) | |
ip.define_magic('printim', gapim) | |
ip.define_magic('Print', gapgx) | |
ip.define_magic('pp', gapgx) | |
ip.define_magic('yat', gayat) | |
ip.define_magic('s', gaset) | |
ip.define_magic('Set', gaset) | |
ip.define_magic('sh', gashaded) | |
ip.define_magic('q', gaquery) | |
ip.define_magic('query', gaquery) | |
ip.define_magic('qref', gaqref) | |
ip.define_magic('qq', gaQuery) | |
ip.define_magic('reinit', gareinit) | |
ip.define_magic('xx', gax) | |
ip.define_magic('ii', gai) | |
ip.define_magic('dd', gad) | |
ip.define_magic('eof', gaeof) | |
# Retrieve GraDS options from environment (set by "pygrads" top script) | |
Bin = os.getenv('GA_BIN',default='gradshdf') | |
Cmd = os.getenv('GA_CMD',default='') | |
Opts = os.getenv('GA_OPT',default='') | |
Files = os.getenv('GA_FIL') | |
if Cmd!='': Opts = '-c "'+Cmd+'" '+Opts | |
# if Opts=='': Opts=None | |
# Instantiate the GrADS object | |
# If someone has an alternative to making ga global, | |
# I'd like to know about it. | |
# -------------------------------------------------- | |
global ga | |
if HAS_GALAB: | |
ga = GaLab(Bin=Bin,Opts=Opts) | |
elif HAS_GANUM and False: | |
ga = GaNum(Bin=Bin,Opts=Opts) | |
else: | |
ga = GrADS(Bin=Bin,Opts=Opts) | |
# Change prompt to something familiar | |
ip.prompt_in1 = ' [\#] ga-> ' | |
# reset prompt and colors, to get this config to actually have an effect: | |
# this setting should really be in an IPython config file, not an exec script, | |
# in which case these lines would be unnecessary: | |
ip.init_displayhook() | |
ip.magic_colors(ip.colors) | |
# if you set up a Profile, then this should replace the banner, rather than being | |
# a print statement: | |
print """ | |
Welcome to PyGrADS, a GrADS-based iPython environment. | |
For more information, type 'help(ipygrads)' | |
? -> Introduction and overview of IPython's features. | |
help -> Python's own help system. | |
qref -> PyGrADS quick reference | |
examples -> Some PyGrADS examples | |
object? -> Details about 'object'. ?object also works, ?? prints more. | |
""" | |
if Files: | |
for file in Files.split(' '): | |
try: | |
fh = ga.open(file,Quiet=True) | |
print "Successfully opened <%s> as File %d"%(file,fh.fid) | |
except: | |
print "Failed to open GrADS file <%s>"%file | |
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#!/usr/bin/env python | |
"""An interactive GrADS shell based on iPython. It requires module | |
"grads" (interface to GrADS executable via bi-directional pipes) and | |
module "ipygrads" (iPython shortcuts through definition of convenient | |
magic commands). The command line interface supports most of the | |
command line arguments of the classic GrADS. For more information | |
type | |
pygrads -h | |
""" | |
import os | |
import sys | |
import IPython | |
from string import * | |
from optparse import OptionParser # Command-line args | |
try: | |
import matplotlib # don't import pylab directly | |
has_pylab = True | |
except: | |
has_pylab = False | |
#--------------------------------------------------------------------- | |
def get_rc (): | |
"""Returns the RC file name, creating a new if it does not exist.""" | |
rcgrads = """ | |
# File automatically generated by pygrads, do not edit | |
import numpy, grads, ipygrads | |
from numpy import * | |
from grads import * | |
from ipygrads import * | |
global ga | |
""" | |
# Get RC file name | |
# ---------------- | |
if os.name is 'nt': | |
home = os.getenv('HOMEPATH',default='') | |
pygadir = os.getenv('PYGRADSDIR',\ | |
default=os.path.join(home,'_pygrads')) | |
rcfname = os.path.join(pygadir,'pygradsrc.ini') | |
else: | |
home = os.getenv('HOME',default='') | |
pygadir = os.getenv('PYGRADSDIR',\ | |
default=os.path.join(home,'.pygrads')) | |
rcfname = os.path.join(pygadir,'pygradsrc') | |
# Create pygrads RC file if necessary | |
# ---------------------------------- | |
if os.path.exists(rcfname): | |
print 'Using existing pygrads rc file <%s>'%rcfname | |
else: | |
# Do we have a rc directory? | |
# ------------------------- | |
if os.path.exists(pygadir) is False: | |
try: | |
os.mkdir(pygadir) | |
except: | |
raise IOError, 'Cannot create directory <%s>'%pygadir | |
# Write default RC file | |
# --------------------- | |
try: | |
fd = open(rcfname,mode='w') | |
fd.write(rcgrads) | |
fd.close() | |
print 'Created pygrads rc file <%s>'%rcfname | |
except: | |
raise IOError, 'Cannot create pygrads rc file <%s>'%rcfname | |
# All done | |
# -------- | |
return rcfname | |
#--------------------------------------------------------------------- | |
print "" | |
print " Welcome to PyGrADS, a GrADS-based iPython environment. " | |
print "" | |
# Parse command line options | |
parser = OptionParser(usage="Usage: %prog [options] [files_to_open]", | |
version='pygrads-1.0.2' ) | |
parser.add_option("-x", "--binary", dest="gabin", default='grads', | |
help="path to grads binary (default=grads)" ) | |
parser.add_option("-C", "--classic", dest="gabin", default='grads', | |
action="store_const", const='gradsc', | |
help="starts GrADS classic (gradsc)" ) | |
parser.add_option("-D","--dap", dest="gabin", default='grads', | |
action="store_const", const='gradsdap', | |
help="starts GrADS DODS (gradsdap)" ) | |
parser.add_option("-d","--dods", dest="gabin", default='grads', | |
action="store_const", const='gradsdods', | |
help="starts GrADS with OPeNDAP (gradsdods)" ) | |
parser.add_option("-H","--hdf4", dest="gabin", default='grads', | |
action="store_const", const='grads', | |
help="starts GrADS HDF-4 (gradshdf)" ) | |
parser.add_option("-n","--nc", dest="gabin", default='grads', | |
action="store_const", const='gradsnc4', | |
help="starts GrADS NetCDF (gradsnc4)" ) | |
parser.add_option("-N","--nc4", dest="gabin", default='grads', | |
action="store_const", const='gradsnc', | |
help="starts GrADS NetCDF (gradsnc" ) | |
parser.add_option("-b", "--batch", | |
action="store_true", dest="batch", default=False, | |
help="start GrADS in batch mode") | |
parser.add_option("-c", "--command", dest="gacmd", default='', | |
help="run a GrADS command on startup (e,g., a script)" ) | |
parser.add_option("-g", "--geometry", dest="geom", default='', | |
help="set size of graphics window, e.g., 800x600" ) | |
parser.add_option("-l", "--landscape", | |
action="store_false", dest="port", default=False, | |
help="start GrADS in landscape mode") | |
parser.add_option("-m", "--metasize", dest="N", default='', | |
help="set metafile buffer size to N" ) | |
parser.add_option("--nopylab", | |
action="store_false", dest="pylab", default=has_pylab, | |
help="start iPython without pylab") | |
parser.add_option("-p", "--portrait", | |
action="store_true", dest="port", default=False, | |
help="start GrADS in portrait mode") | |
parser.add_option("-W", "--wideline", | |
action="store_true", dest="port", default=False, | |
help="use X server wide lines (faster) instead of s/w (better)") | |
parser.add_option("-X", "--xmode", | |
dest="xmode", default='Plain', | |
help="""Mode for exception reporting. The valid modes are Plain, Context, and Verbose. 'Plain' similar to python's normal traceback printing. | |
'Context' prints 5 lines of context source code around each line in the traceback. 'Verbose' is similar to Context, but additionally prints the variables | |
currently visible where the exception happened (shortening their | |
strings if too long). Default is 'Plain'.""") | |
(options, filenames) = parser.parse_args() | |
# Form GrADS command line | |
gaopt = '' | |
if options.batch: gaopt = '-b ' | |
if options.geom != '': gaopt = gaopt+"-g "+options.geom+" " | |
if options.port == False: gaopt = gaopt+'-l ' | |
else: gaopt = gaopt+'-p ' | |
# Define parameters to instantiate GrADS further down | |
# Note: global variables do not quite work for this, | |
# hence environment vars | |
os.environ['GA_BIN'] = options.gabin | |
os.environ['GA_CMD'] = options.gacmd | |
os.environ['GA_OPT'] = gaopt | |
os.environ['GA_FIL'] = join(filenames,sep=' ') | |
# Reset command line args so that IPython does what we want | |
# --------------------------------------------------------- | |
rcfname = get_rc() | |
# rcfname ignored in IPython 0.11 | |
sys.argv = [ 'pygrads', '--no-banner', '--no-confirm-exit', | |
'--InteractiveShell.xmode=%s'%options.xmode, | |
'-i', rcfname | |
] | |
if options.pylab: | |
sys.argv.append('--pylab') | |
# Start IPython | |
# ------------- | |
from IPython.frontend.terminal import ipapp | |
ipapp.launch_new_instance() | |
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