HelperStructs.h

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/*
   Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 */
 
#ifndef TRKEXINTERFACES_HELPERSTRUCTS_H
#define TRKEXINTERFACES_HELPERSTRUCTS_H
 
#include "TrkParameters/TrackParameters.h"
 
namespace Trk {
struct HitInfo
{
  std::unique_ptr<const Trk::TrackParameters> trackParms; // intersection
  float time;                                             // timing
  int detID;     // sensitive detector id
  float deposit; // interaction energy deposit (secondaries subtracted)
 
  HitInfo(std::unique_ptr<const Trk::TrackParameters> parms,
          float time,
          int id,
          float deposit)
    : trackParms(std::move(parms))
    , time(time)
    , detID(id)
    , deposit(deposit)
  {
  }
};
 
struct PathLimit 
{
  float x0Max;       // path limit after which sampled process occurs
  float x0Collected; // x0 traversed so far
  float l0Collected; // l0 traversed so far
  float weightedZ;   // type of material traversed (divide by collected x0 to get average Z)
  int   process;     // type of pre-sampled material process
 
  PathLimit( float pathLimit, int proc) :
    x0Max(pathLimit), x0Collected(0.0), l0Collected(0.0),weightedZ(0.0), process(proc)
  {} 
 
  void updateMat( float dX0, float Z, float dL0) { 
    x0Collected += dX0; weightedZ += dX0*Z; 
    l0Collected += dL0>0. ? dL0 : dX0/0.37/Z;     // use approximation if l0 not available
  }
};
 
struct TimeLimit 
{
  float tMax;       // pre-sampled life-time
  float time;       // timing  
  int   process;    // type of pre-sampled decay process
 
  TimeLimit( float timeMax, float time, int proc) :
    tMax(timeMax), time(time), process(proc)
  {} 
 
  void updateTime( float dt) { time += dt; }
};
}
 
#endif