// -*- mode: c++ -*-
//
// $Id: BrVector3D.h,v 1.2 2001/08/14 19:27:52 pchristi Exp $
// $Author: pchristi $
// $Date: 2001/08/14 19:27:52 $
// $Copyright: (C) 2001 BRAHMS Collaboration <brahmlib@rhic.bnl.gov>
//
#ifndef BRAT_BrVector3D
#define BRAT_BrVector3D

#ifndef ROOT_TObject
#include "TObject.h"
#endif
#ifndef WIN32
#include <iostream>
#else
#include <iostream.h>
#endif

//
//  

//////////////////////////////////////////////////////////////////////////////
//
//  BrVector3D
//
//  3D Vector. Part of the Geometry classes Points, Vector, Lines, Planes.
//
//  Author:   F.Videbaek
//  Created:  July 1998
//
//
///////////////////////////////////////////////////////////////////////////// 

class BrVector3D : public TObject {

public:

  // constructors and destructors
  //
  BrVector3D(const Double_t x=0.0, const Double_t y =0.0 , const Double_t z=0.0) :
    fX(x), fY(y), fZ(z) {};

  BrVector3D(const Float_t *pos) {fX=pos[0];fY=pos[1];fZ=pos[2];};
  BrVector3D(const Double_t *pos) : fX(pos[0]), fY(pos[1]), fZ(pos[2]) {};
  
  //  ~BrVector3D(){};
  
  //    BrVector3D(const BrVector3D& vec) :
  //      fX(vec.fX), fY(vec.fY), fZ(vec.fZ) {};

  // BrVector3D& operator = (const BrVector3D&);
  //
  // general field operators
  BrVector3D& operator +=(const BrVector3D&);
  BrVector3D& operator -=(const BrVector3D&);
  BrVector3D  operator - () const;
  BrVector3D  operator + () const;
  const Double_t& operator [] (size_t) const;
  Double_t& operator [] (size_t);

  const Double_t& operator () (size_t) const;
  Double_t&   operator () (size_t);

  Bool_t operator == (const BrVector3D&) const;
  Bool_t operator != (const BrVector3D&) const;

  // access methods
  Double_t GetX() const {return fX;};
  Double_t GetY() const {return fY;};
  Double_t GetZ() const {return fZ;};
  
  Double_t X() const {return fX;};
  Double_t Y() const {return fY;};
  Double_t Z() const {return fZ;};

  void SetX(Double_t value) { fX = value;};
  void SetY(Double_t value) { fY = value;};
  void SetZ(Double_t value) { fZ = value;};
  //
  // vector operations
  Double_t Norm() const;
  Double_t NormSq() const;
  Double_t Dot(const BrVector3D&) const;
  BrVector3D Cross(const BrVector3D&) const;
  BrVector3D Unit() const;
  Double_t Theta() const;
  Double_t Phi() const;
  virtual void Print(Option_t* option = "") const;
  //Distance between points
  Double_t Distance(const BrVector3D &vect) const;
  
  
private:
  
  Double_t fX;  //  1. Vector Element
  Double_t fY;  //  2. Vector Element
  Double_t fZ;  //  3. Vector Element
  
  friend BrVector3D operator+(const BrVector3D& v1, const BrVector3D& v2);
  friend BrVector3D operator-(const BrVector3D& v1, const BrVector3D& v2);
  friend BrVector3D operator*(Double_t a, const BrVector3D& v2);
  friend BrVector3D operator*(const BrVector3D& v1, Double_t a);
  friend BrVector3D operator/(const BrVector3D& v1, Double_t a); 
  ClassDef(BrVector3D,1)
    
    };
    
//
// Related Global functions
//

ostream& operator<<(ostream& str, const BrVector3D&);
istream& operator>>(istream& str, BrVector3D&);

BrVector3D Cross(const BrVector3D&, const BrVector3D&);


#endif

//
//  $Log: BrVector3D.h,v $
//  Revision 1.2  2001/08/14 19:27:52  pchristi
//  Removed copy constructors and destructors where the default was good enough.
//
//  Revision 1.1.1.1  2001/06/21 14:55:20  hagel
//  Initial revision of brat2
//
//  Revision 1.15  2001/06/17 17:09:55  pchristi
//  Cleaned up and modified the line 3D and vector3D classes.
//  No major new stuff.
//
//  Revision 1.14  2000/09/18 21:25:59  videbaek
//  Modified internal structure of BrDetectorvolume
//  Associated changes.
//
//  Revision 1.13  1999/01/27 22:59:42  hagel
//  Added Distance()
//
//  Revision 1.12  1999/01/27 22:41:57  hagel
//  Added yet another constructor to BrVector3D
//
//  Revision 1.11  1999/01/27 22:38:48  hagel
//  Added another constructor to BrVector3D
//
//  Revision 1.10  1999/01/21 23:23:24  hagel
//  1. Changed convention for checking includes.  Current convention is:
//     BRAT_Br...... eg BRAT_BrModule ala ROOT.
//  2. Added CVS logs to .h files that didn't have them.
//  3. Moved checking of include definition to first line for easier reading
//  4. Put checks before all includes in the include files as per 
//     BRAT specifications
//  5. Added BrGeantHeader to Geant Makefile
//  6. All changes have been checked to compile on NT ala Cygnus
//
//  Revision 1.9  1998/12/01 20:49:58  videbaek
//  Added several classes to Geometry. Updated source and makefile(s)
//  - BrLine3D
//  - BrCoordinateSystem
//  - BrRotMatrix
//
//  Revision 1.8  1998/11/13 19:28:01  videbaek
//  Added operators for setting vector elements by index; i.e.
//  vector[2]=x; and vector(i)=cv[i]; as example.
//
//  Revision 1.7  1998/09/18 15:44:50  videbaek
//  Removed BrPoint3D class
//  Added iostream operator to BrVector3Dn
//
//  Revision 1.6  1998/09/15 13:08:33  videbaek
//  Id and Log had disappeared from header
//
//  Revision 1.4  1998/07/28 21:30:12  videbaek
//  Added Theta()  and Phi() members
//
//  Revision 1.3  1998/07/27 14:41:41  videbaek
//  small fixes to vector class
//
//  Revision 1.2  1998/07/24 13:18:21  videbaek
//  Added many functions to vector and point
//
//  Revision 1.1  1998/07/20 17:35:49  videbaek
//  simple geometry class
//