[u/mrichter/AliRoot.git] / STEER / AliHit.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

//-----------------------------------------------------------------------
//    Base Hit class for all detectors
//    Contains the coordinates of the hit (single energy deposition)
//    and the number of correspondent track
//    Author:
//-----------------------------------------------------------------------

#include "TParticle.h"

#include "AliHit.h"
#include "AliRun.h"
#include "AliMC.h"

ClassImp(AliHit)

//_______________________________________________________________________
AliHit::AliHit():
  fTrack(0),
  fX(0),
  fY(0),
  fZ(0)
{
  //
  // Default constructor
  //
}

//_______________________________________________________________________
AliHit::AliHit(Int_t shunt, Int_t track):
  fTrack(0),
  fX(0),
  fY(0),
  fZ(0)
{
  //
  // Standard constructor
  //
  if(shunt == 1) {
    int primary = gAlice->GetMCApp()->GetPrimary(track);
    gAlice->GetMCApp()->Particle(primary)->SetBit(kKeepBit);
    fTrack=primary;
  } 

  else if (shunt == 2) {
    // the "primary" particle associated to the hit is
    // the last track that has been flagged in the StepManager
    // used by PHOS to associate the hit with the decay gamma
    // rather than with the original pi0 
    TParticle *part;
    Int_t current;
    Int_t parent=track;
    while (1) {
      current=parent;
      part = gAlice->GetMCApp()->Particle(current);
      parent=part->GetFirstMother();    
      if(parent<0 || part->TestBit(kKeepBit))
	break;
    }
    fTrack=current;   
  }

  else {
    fTrack=track;
    gAlice->GetMCApp()->FlagTrack(fTrack);
  }
}
Commit	Line	Data
	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	/* $Id$ */
	17
	18	//-----------------------------------------------------------------------
	19	// Base Hit class for all detectors
	20	// Contains the coordinates of the hit (single energy deposition)
	21	// and the number of correspondent track
	22	// Author:
	23	//-----------------------------------------------------------------------
	24
	25	#include "TParticle.h"
	26
	27	#include "AliHit.h"
	28	#include "AliRun.h"
	29	#include "AliMC.h"
	30
	31	ClassImp(AliHit)
	32
	33	//_______________________________________________________________________
	34	AliHit::AliHit():
	35	fTrack(0),
	36	fX(0),
	37	fY(0),
	38	fZ(0)
	39	{
	40	//
	41	// Default constructor
	42	//
	43	}
	44
	45	//_______________________________________________________________________
	46	AliHit::AliHit(Int_t shunt, Int_t track):
	47	fTrack(0),
	48	fX(0),
	49	fY(0),
	50	fZ(0)
	51	{
	52	//
	53	// Standard constructor
	54	//
	55	if(shunt == 1) {
	56	int primary = gAlice->GetMCApp()->GetPrimary(track);
	57	gAlice->GetMCApp()->Particle(primary)->SetBit(kKeepBit);
	58	fTrack=primary;
	59	}
	60
	61	else if (shunt == 2) {
	62	// the "primary" particle associated to the hit is
	63	// the last track that has been flagged in the StepManager
	64	// used by PHOS to associate the hit with the decay gamma
	65	// rather than with the original pi0
	66	TParticle *part;
	67	Int_t current;
	68	Int_t parent=track;
	69	while (1) {
	70	current=parent;
	71	part = gAlice->GetMCApp()->Particle(current);
	72	parent=part->GetFirstMother();
	73	if(parent<0 \|\| part->TestBit(kKeepBit))
	74	break;
	75	}
	76	fTrack=current;
	77	}
	78
	79	else {
	80	fTrack=track;
	81	gAlice->GetMCApp()->FlagTrack(fTrack);
	82	}
	83	}