DifRotation.h

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//--------------------------------------------------------------------------
// File and Version Information:
//  $Id: DifRotation.h,v 1.2 2009/12/23 02:59:56 zhangy Exp $
//
// Description:
//  Class Header for |DifRotation|
//      Rotation matrix and rotate things
//
// Environment:
//  Software developed for the BaBar Detector at the SLAC B-Factory.
//
// Author List:
//  A. Snyder
//
// Copyright Information:
//  Copyright (C) 1996  SLAC
// 
// History:
//  Migration for BESIII MDC
//
//------------------------------------------------------------------------
 
#ifndef DifRotation_H
#define DifRotation_H
 
#include "MdcRecoUtil/DifVector.h"
 
class DifRotation {
 
public:
 
  //constructors
  DifRotation();        // unit matrix 
  DifRotation           // construct from euler
  (const DifNumber& alpha,
   const DifNumber& beta,
   const DifNumber& gamma);
 
  DifRotation           // constructionr from axes
  (const DifVector& xp,const DifVector& yp,const DifVector& zp);
  DifRotation           // z=x X y
  (const DifVector& xp,const DifVector& yp);
 
  ~DifRotation() {};
 
  //access
  inline DifVector xnew()const {return _xnew;}
  inline DifVector ynew()const {return _ynew;}
  inline DifVector znew()const {return _znew;}
 
  //rotate a vector
  void rotate(DifVector& v)const;
 
  //error check
  int fail()const;      // check for orthonormality failure
 
private:
 
  //data - store as vector
  DifVector _xnew;
  DifVector _ynew;
  DifVector _znew;
};
 
#endif