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#!/usr/bin/env python
#--*-python-*-
from chroma.tools import profile_if_possible
@profile_if_possible
def main():
import optparse
import sys
import imp
import os
import inspect
import numpy as np
import itertools
from chroma import event
from chroma import itertoolset
from chroma import Simulation
from chroma import root
from chroma.rootimport import ROOT
ROOT.gROOT.SetBatch()
from chroma.generator.vertex import constant_particle_gun
from chroma.log import logger, logging
logger.setLevel(logging.INFO)
parser = optparse.OptionParser('%prog <detector>')
parser.add_option('-o', dest='output_filename',
help='output filename', default='out.root')
parser.add_option('-j', type='int', dest='device',
help='CUDA device number', default=None)
parser.add_option('-s', type='int', dest='seed',
help='random number generator seed')
parser.add_option('-g', type='int', dest='ngenerators',
help='number of GEANT4 processes', default=4)
parser.add_option('-n', '--nevents', type='int', dest='nevents',
default=100)
parser.add_option('-p', '--particle', dest='particle',
help='particle name', default='e-')
parser.add_option('-k', '--ke', type='float', dest='ke',
help='kinetic energy (MeV)', default=100.0)
parser.add_option('--pos', dest='pos',
help='particle vertex origin', default='0,0,0')
parser.add_option('--dir', dest='dir',
help='particle vertex direction', default='1,0,0')
parser.add_option('--save-photons-beg', action='store_true',
dest='save_photons_beg',
help='save initial photons to disk', default=False)
parser.add_option('--save-photons-end', action='store_true',
dest='save_photons_end',
help='save final photons to disk', default=False)
parser.add_option('--debug', dest='debug',
action='store_true', default=False,
help='Start python debugger on exception')
parser.add_option('--rootlogon', dest='rootlogon',
action='store_true', default=False,
help='Write a .rootlogon.C file to the current directory for reading Chroma ROOT files.')
options, args = parser.parse_args()
if options.rootlogon:
if os.path.exists('.rootlogon.C'):
print >>sys.stderr, ".rootlogon.C file already exists!"
sys.exit(1)
else:
with open('.rootlogon.C', 'w') as f:
print >>f, '{\ngROOT->ProcessLine(".L ~/.chroma/root.C+");\n}'
print >>sys.stderr, '.rootlogon.C created'
sys.exit(0)
if len(args) < 1:
sys.exit(parser.format_help())
if options.debug:
enable_debug_on_crash()
module_name, function_name = args[0].rsplit('.', 1)
try:
module = __import__(module_name, fromlist=[function_name])
except ImportError:
raise
detector = getattr(module, function_name)
if inspect.isfunction(detector):
detector = detector()
pos = np.array([float(s) for s in options.pos.split(',')], dtype=float)
dir = np.array([float(s) for s in options.dir.split(',')], dtype=float)
ev_gen = constant_particle_gun(particle_name=options.particle,
pos=pos, dir=dir, ke=options.ke)
sim = Simulation(detector, seed=options.seed, cuda_device=options.device,
geant4_processes=options.ngenerators)
print 'RNG seed: %i' % sim.seed
writer = root.RootWriter(options.output_filename)
for i, ev in \
enumerate(sim.simulate(itertools.islice(ev_gen,
options.nevents),
keep_photons_beg=options.save_photons_beg,
keep_photons_end=options.save_photons_end)):
print '\rEvent: %i' % (i+1),
sys.stdout.flush()
assert ev.nphotons > 0, 'Geant4 generated event with no photons!'
writer.write_event(ev)
print
writer.close()
if __name__ == '__main__':
main()
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