RVector2D.hh

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//======================================================================
/*! \file RVector2D.hh
 *
 *  Include file for class RVector2D.
 */
//======================================================================

#ifndef R_VECTOR_2D_HH
#define R_VECTOR_2D_HH

#include <TPoints.h>
#include <math.h>

#include "GGlobal.hh"
#include "GLogMessage.hh"

//======================================================================
/*! \class RVector2D
 *
 *  Classe élargissant la classe ROOT TPoints avec des fonctions
 *  d'algèbre à 2 dimensions
 *
 *  Les classes RVector2D et RPoint2D sont strictement équivalentes.
 */

class RVector2D : public TPoints
{
  //------------------------------------------------------------
  /*! \object_doc{RVector2D} */
  GObject(RVector2D);
  //------------------------------------------------------------

  protected:

  public:
    static const RVector2D null;  ///< Vecteur nul
    static const RVector2D x;     ///< Vecteur unitaire x
    static const RVector2D y;     ///< Vecteur unitaire y
    static const Double_t  zero;  ///< Limite de calcul (approximation du 0)

  //------------------------------------------------------------
  //  Constructors / affectation / destructor

    // constructors
    RVector2D ( );                                      // inline
    RVector2D ( const Double_t x, const Double_t y );   // inline
          RVector2D ( const Double_t p[] );                   // inline
          RVector2D ( const TPoints &p );                     // inline
    RVector2D ( const RVector2D &p );                   // inline

    // affectation
    RVector2D & operator = ( const RVector2D &p );
    RVector2D & operator = ( const TPoints &p );

    // destructor
    virtual ~RVector2D ( ); // inline

  //------------------------------------------------------------
  //  Access to members

    Double_t  X( ) const;   // inline
    Double_t  Y( ) const;   // inline

    Double_t  operator [] ( const u_int n ) const;

  //------------------------------------------------------------
  //  Operations

    // opérateurs unaires
    RVector2D operator + ( ) const;
    RVector2D operator - ( ) const;

    // affectation operative
    RVector2D operator += ( const RVector2D &v );
    RVector2D operator -= ( const RVector2D &v );
    RVector2D operator *= ( const Double_t   r );
    RVector2D operator /= ( const Double_t   r );

    // opérateur binaires
    Double_t  operator * ( const RVector2D &v ) const;
    Double_t  operator ^ ( const RVector2D &v ) const;
    RVector2D operator + ( const RVector2D &v ) const;
    RVector2D operator - ( const RVector2D &v ) const;

    RVector2D operator * ( const Double_t r ) const;
    RVector2D operator / ( const Double_t r ) const;

  //------------------------------------------------------------
    Double_t  LengthSquare ( ) const;
    Double_t  Length       ( ) const;
    RVector2D Unit         ( ) const;

    Double_t  Angle        ( const RVector2D &v ) const;

    Double_t  DistanceTo ( const TPoints &p ) const;
    Double_t  DistanceTo ( const Double_t x, const Double_t y ) const;

  //------------------------------------------------------------
  /*! For ROOT dictionary.*/
    ClassDef(RVector2D,0);
} ;

/*! 2D point data type definition. */
typedef RVector2D  RPoint2D;

//----------------------------------------------------------------------
//  External functions

extern RVector2D operator * ( const double r, const RVector2D &v ); // inline

//----------------------------------------------------------------------
//  Inline functions
#include "icc/RVector2D.icc"

//======================================================================
#endif