Reconstruction/MdcPatRec/MdcRecoUtil/include/MdcRecoUtil/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