simpleEventDisplay.py

#!/usr/bin/env python3
 
 
 
# avoid race conditions beetween pyroot and GUI thread
from ROOT import PyConfig
PyConfig.StartGuiThread = False  # noqa
 
import basf2 as b2
import os
import glob
import sys
 
from ROOT import Belle2
from ROOT import TCanvas, TH1F
from simulation import add_simulation
from reconstruction import add_reconstruction
 
 
# ------------------------------------------------------------------------------
# An example of a simple event display, made by using a python module.
# It displays timing distributions of modules produced by a generic BBbar event.
# Red histograms are marking the modules with at least one track impact.
# ------------------------------------------------------------------------------
 
class TOPDisplay(b2.Module):
 
    '''
    Simple event display for TOP.
    It displays single event timing distributions of modules using TOPDigits.
    Distributions of modules with the track impact are shown in red color.
    '''
 
    
    hist = [TH1F('h' + str(i), 'module#' + str(i), 128, 0.0, 256.0) for i in
            range(16)]
    
    c1 = TCanvas('c1', 'TOP event display', 1000, 800)
 
    def initialize(self):
        ''' Initialize the Module: open the canvas. '''
 
        self.c1.Divide(4, 4)
        self.c1.Show()
 
    def event(self):
        '''
        Event processor: reset and fill the histograms, display them,
        wait for user respond.
        '''
 
        for i in range(16):
            self.hist[i].Reset()
            self.hist[i].SetFillColor(0)
            self.hist[i].SetLineColor(1)
 
        likelihoods = Belle2.PyStoreArray('TOPLikelihoods')
        for likelihood in likelihoods:
            if likelihood.getFlag() == 1:
                exthit = likelihood.getRelated('ExtHits')
                try:
                    moduleID = exthit.getCopyID()
                    self.hist[moduleID - 1].SetFillColor(2)
                    self.hist[moduleID - 1].SetLineColor(2)
                except BaseException:
                    b2.B2ERROR('No relation to ExtHit')
 
        digits = Belle2.PyStoreArray('TOPDigits')
        for digit in digits:
            moduleID = digit.getModuleID()
            tdc = digit.getRawTime()
            self.hist[moduleID - 1].Fill(tdc)
 
        for i in range(16):
            self.c1.cd(i + 1)
            self.hist[i].Draw()
 
        self.c1.Update()
 
        # wait for user respond
        user_input = input("Press Enter to continue or Q to quit ").lower().strip()
        if user_input == "q":
            evtMetaData = Belle2.PyStoreObj('EventMetaData')
            evtMetaData.obj().setEndOfData()
 
 
# Check if the display is set (needed for canvas)
if 'DISPLAY' not in os.environ:
    print('DISPLAY variable is not set')
    print('- to set it in bash: export DISPLAY=:0')
    print('- to set it in csh:  setenv DISPLAY :0')
    sys.exit()
 
# Suppress messages other than errors
b2.set_log_level(b2.LogLevel.ERROR)
 
# Create path
main = b2.create_path()
 
# Set number of events to generate
eventinfosetter = b2.register_module('EventInfoSetter')
eventinfosetter.param('evtNumList', [1000])
main.add_module(eventinfosetter)
 
# generate BBbar events
evtgeninput = b2.register_module('EvtGenInput')
main.add_module(evtgeninput)
 
# Detector simulation
bg = None
if 'BELLE2_BACKGROUND_DIR' in os.environ:
    bg = glob.glob(os.environ['BELLE2_BACKGROUND_DIR'] + '/*.root')
add_simulation(main, bkgfiles=bg)
 
# Reconstruction
add_reconstruction(main)
 
# dispay
main.add_module(TOPDisplay())
 
# Show progress of processing
progress = b2.register_module('Progress')
main.add_module(progress)
 
# Process events
b2.process(main)
 
# Print call statistics
print(b2.statistics)