EvtHepMCEvent.hh
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EvtHepMCEvent.hh
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	//--------------------------------------------------------------------------
	//
	// Environment:
	// This software is part of the EvtGen package. If you use all or part
	// of it, please give an appropriate acknowledgement.
	//
	// Copyright Information: See EvtGen/COPYRIGHT
	// Copyright (C) 2011 University of Warwick, UK
	//
	// Module: EvtHepMCEvent
	//
	// Description: Create an HepMC::GenEvent for the complete EvtParticle
	// decay tree.
	//
	// Modification history:
	//
	// John Back June 2011 Module created
	//
	//------------------------------------------------------------------------

	#ifndef EVTHEPMCEVENT_HH
	#define EVTHEPMCEVENT_HH

	#include "EvtGenBase/EvtVector4R.hh"

	#include "HepMC/GenEvent.h"
	#include "HepMC/GenParticle.h"
	#include "HepMC/SimpleVector.h"

	class EvtParticle;

	class EvtHepMCEvent {

	public:

	EvtHepMCEvent();
	virtual ~EvtHepMCEvent();

	// Select what frame a given GenParticle is in:
	// its own restframe, the lab frame (first mother), or its mother's frame
	enum HepMCFrame {RESTFRAME = 1, LAB = 2, MOTHER = 3};
	// Select the GenParticle status
	enum HepMCStatus {STABLE = 1, DECAYED = 2, HISTORY = 3};

	void constructEvent(EvtParticle* baseParticle);
	void constructEvent(EvtParticle* baseParticle, EvtVector4R& translation);

	HepMC::GenEvent* getEvent() {return _theEvent;}

	// Methods used to create GenParticles and FourVectors of vertices.
	// Make these public so that other classes may call them if they use EvtHepMCEvent.

	// Create a GenParticle using info from the EvtParticle, specifying what frame
	// the 4-momentum is from.
	HepMC::GenParticle* createGenParticle(EvtParticle* theParticle, int frameType);

	// Find out the decay vertex position for the given EvtParticle.
	HepMC::FourVector getVertexCoord(EvtParticle* theParticle);

	protected:

	private:

	// Delete the event structure (called by destructor)
	void deleteEvent();

	// Add a vertex to the event. This is called by the constructEvent function
	// and is recursive, i.e. it loops through all possible daughter particles and
	// their descendents.
	void addVertex(EvtParticle* inEvtParticle, HepMC::GenParticle* inGenParticle);

	HepMC::GenEvent* _theEvent;
	EvtVector4R _translation;

	};

	#endif

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