import ROOT
import os.path

ROOT.gROOT.ProcessLine('.L '+os.path.join(os.path.dirname(__file__), 'root.C+g'))

from ROOT import Event

fill_photons = ROOT.fill_photons
fill_hits = ROOT.fill_hits

def make_tree(name, desc=''):
    '''Create a ROOT tree for holding event information.

    Returns tuple of Event object for filling and TTree.
    '''
    tree = ROOT.TTree(name, desc)
    ev = ROOT.Event()
    tree.Branch('ev', ev)
    return ev, tree