mlVector2.h

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/*************************************************************************************
**
** Copyright 2007, MeVis Medical Solutions AG
**
** The user may use this file in accordance with the license agreement provided with
** the Software or, alternatively, in accordance with the terms contained in a
** written agreement between the user and MeVis Medical Solutions AG.
**
** For further information use the contact form at https://www.mevislab.de/contact
**
**************************************************************************************/
 
#ifndef ML_VECTOR2_H
#define ML_VECTOR2_H

 
// Include system independent file and project settings.
#include "mlLinearAlgebraSystem.h"
#include "mlLinearAlgebraDefs.h"
#include "mlFloatingPointVector.h"
 
// All declarations of this header will be in the ML_LA_NAMESPACE namespace.
ML_LA_START_NAMESPACE

template <class DT>
class Vector2DataContainer
{
public:
  union {
    struct {
      DT x;
      DT y;
    };
    DT _buffer[2];
  };
};
 
//--------------------------------------------------------------------
// This is necessary, because we do not know whether vector or
// matrix header is included first and we cannot move template
// code into the C++ file.
//--------------------------------------------------------------------
template <class DT> class Tvec3;
 
//--------------------------------------------------------------------
//--------------------------------------------------------------------
template <class DT>
class Tvec2 : public FloatingPointVector<DT, 2, Vector2DataContainer<DT> >
{
public:

  typedef FloatingPointVector<DT, 2, Vector2DataContainer<DT> > Superclass;

  typedef DT ComponentType;
 
  //--------------------------------------------------------------------
  //--------------------------------------------------------------------
  inline explicit Tvec2(const DT value=0) : Superclass(value)
  {
  }

  inline Tvec2(const Superclass &v): Superclass(v)
  {
  }

  inline Tvec2(const DT px, const DT py) : Superclass()
  {
    assign(px,py);
  }

  inline void assign(const DT px, const DT py)
  {
    Superclass::_buffer[0] = px;
    Superclass::_buffer[1] = py;
  }

  inline Tvec2(const Tvec3<DT>& v, const bool normalize) : Superclass()
  {
    if (normalize){
      // Homogeneous cast.
      ML_CHECK_FLOAT_THROW(v[2]);
      Superclass::_buffer[0] = v[0]/v[2];
      Superclass::_buffer[1] = v[1]/v[2];
    }
    else{
      // Normal cast.
      Superclass::_buffer[0] = v[0];
      Superclass::_buffer[1] = v[1];
    }
  }

  inline Tvec2(const Tvec3<DT>& v, const int axis) : Superclass()
  {
    switch (axis) {
      case 0:  Superclass::_buffer[0] = v[1];
               Superclass::_buffer[1] = v[2]; break;
      case 1:  Superclass::_buffer[0] = v[0];
               Superclass::_buffer[1] = v[2]; break;
      default: Superclass::_buffer[0] = v[0];
               Superclass::_buffer[1] = v[1]; break;
    }
  }


  inline Tvec3<DT> affineVec() const
  {
    return Tvec3<DT>(*this, 0);
  }

  inline Tvec3<DT> affinePoint() const
  {
    return Tvec3<DT>(*this, 1);
  }
 
}; // end of class *Tvec2<DT>*
 
 
//-----------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------
typedef Tvec2<MLfloat>   Vector2f;
typedef Tvec2<MLdouble>  Vector2d;
typedef Tvec2<MLldouble> Vector2ld;
typedef Tvec2<MLdouble>  Vector2;
 
ML_LA_END_NAMESPACE
 
#endif //of __mlVector2_H