show_pointings.py
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#! /usr/bin/env python
# ==========================================================================
# Display pointings in observation definition XML file
#
# Copyright (C) 2017 Juergen Knoedlseder
#
# 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, either version 3 of the License, or
# (at your option) any later version.
#
# 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, see <http://www.gnu.org/licenses/>.
#
# ==========================================================================
import sys
import gammalib
import cscripts
try:
import matplotlib.pyplot as plt
plt.figure()
plt.close()
except (ImportError, RuntimeError):
print('This script needs the "matplotlib" module')
sys.exit()
# =============================== #
# Extract pointings from XML file #
# =============================== #
def get_pointings(filename):
"""
Extract pointings from XML file
Parameters
----------
filename : str
File name of observation definition XML file
Returns
-------
pnt : list of dict
Pointings
"""
# Initialise pointings
pnt = []
# Open XML file
xml = gammalib.GXml(filename)
# Get observation list
obs = xml.element('observation_list')
# Get number of observations
nobs = obs.elements('observation')
# Loop over observations
for i in range(nobs):
# Get observation
run = obs.element('observation', i)
# Get pointing parameter
npars = run.elements('parameter')
ra = None
dec = None
south = False
for k in range(npars):
par = run.element('parameter', k)
if par.attribute('name') == 'Pointing':
ra = float(par.attribute('ra'))
dec = float(par.attribute('dec'))
if par.attribute('name') == 'Calibration':
if 'South' in par.attribute('response'):
south = True
else:
south = False
if ra != None:
p = gammalib.GSkyDir()
p.radec_deg(ra, dec)
entry = {'l': p.l_deg(), 'b': p.b_deg(), 'ra': ra, 'dec': dec, 'south': south}
pnt.append(entry)
# Return pointings
return pnt
# ================ #
# Plot information #
# ================ #
def plot_pointings(pnt, plotfile):
"""
Plot information
Parameters
----------
pnt : list of dict
Pointings
plotfile : str
Plot filename
"""
# Create figure
plt.figure()
# Setup figure
ax = plt.gca()
ax.cla()
ax.set_xlim((180, -180))
ax.set_ylim((-90, 90))
# Loop over pointings
for p in pnt:
# Get longitude
l = p['l']
if l > 180.0:
l = l - 360.0
# Set color
if p['south']:
color='r'
else:
color='b'
# Set circle
circle = plt.Circle((l, p['b']), 3.0, color=color, fill=False)
# Add circle
ax.add_artist(circle)
# Plot title and labels
plt.xlabel('Galactic longitude (deg)')
plt.ylabel('Galactic latitude (deg)')
plt.title('Pointings')
# Show plots or save it into file
if len(plotfile) > 0:
plt.savefig(plotfile)
else:
plt.show()
# Return
return
# ============== #
# Show pointings #
# ============== #
def show_pointings():
"""
Show pointings
"""
# Set usage string
usage = 'show_pointings.py [-p plotfile] file'
# Set default options
options = [{'option': '-p', 'value': ''}]
# Get arguments and options from command line arguments
args, options = cscripts.ioutils.get_args_options(options, usage)
# Extract script parameters from options
plotfile = options[0]['value']
# Get pointings
pnt = get_pointings(args[0])
# Plot pointings
plot_pointings(pnt, plotfile)
# Return
return
# ======================== #
# Main routine entry point #
# ======================== #
if __name__ == '__main__':
# Show pointings
show_pointings()