//-----------------------------------------------------------
// File and Version Information:
// $Id$
//
// Description:
//     This class describes a Laser beam in the tpc volume
//
// Environment:
//      Software developed for the PANDA Detector at FAIR.
//
// Author List:
//      Felix Boehmer        TUM            (original author)
//
//
//-----------------------------------------------------------


#ifndef TPCLASER_H
#define TPCLASER_H

#include "TVector3.h"
#include "TClonesArray.h"
#include "TObject.h"


class TpcLaser : public TObject {

//Constructors ----------------------------------------------

 public:

  //either supply direction here, or set direction or endpoint 
  //manually via set-functions

  TpcLaser();
  TpcLaser(unsigned int id, const TVector3& start, const TVector3& direction,
	   double iondens=0, double width=0, double time=0, bool dirisend=false);
  TpcLaser(unsigned int id, double rMin, double rMax, double zMin, double zMax,
	   const TVector3& start, const TVector3& direction,
	   double iondens=0, double width=0, double time=0, bool dirisend=false);
	   

  
  virtual ~TpcLaser();


//Modifiers -------------------------------------------------

  void setEndPos(TVector3 end) {fend = end;}
  void setDirection(TVector3 dir) {fdir = dir * (1/(double)dir.Mag());} 
  void setIonDens(double iondens) {fionDens = iondens;}
  void setWidth(double width) {fwidth = width;}
  void setTime(double time) {ftime = time;}

  //create PrimaryClusters of 1 electron each 
  //(using LinearInterpolPolicy) and returns a TCA
  //Ownership of the TCA lies with the caller!
  TClonesArray* activate();       //fires the laser

//Acessors --------------------------------------------------

  TVector3 getStart() const {return fstart;} 
  TVector3 getDir() const {return fdir;}
  TVector3 getEnd() const {return fend;}
  double getIonDens() const {return fionDens;}
  double getWidth() const {return fwidth;}
  double getTime() const {return ftime;}
  int getNE() const {return ftotalNE;}  //-1 if laser was never activated
  unsigned int getId() const {return fId;}
  
  void print();

  
// ----------------------------------------------------------


 private:
  
  
  TVector3 fstart;     //starting position
  TVector3 fend;              //end point
  TVector3 fdir;              //direction, normalized

  double fionDens;           //mean ion density on track 
                             //[electrons/cm]
  double fwidth;             //width of laser beam
  double ftime;              //fire time
  
  int ftotalNE;      //total number of electrons
  unsigned int fId;

  bool fEval;

  double frMin, frMax, fzMin, fzMax;   //Tpc geometry.
 
  void evalGeometry();   //evaluates endpoint or direction

 public:
  ClassDef(TpcLaser,1)

};

#endif