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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkCovariantVector.h.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:34 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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#ifndef __itkCovariantVector_h |
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#define __itkCovariantVector_h |
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#include "itkFixedArray.h" |
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#include "vnl/vnl_vector_ref.h" |
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#include "itkIndent.h" |
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#include "itkVector.h" |
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namespace itk |
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{ |
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/** \class CovariantVector |
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* \brief A templated class holding a n-Dimensional covariant vector. |
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* |
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* CovariantVector is a templated class that holds a single vector (i.e., an array |
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* of values). CovariantVector can be used as the data type held at each pixel in |
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* an Image or at each vertex of an Mesh. The template parameter T can |
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* be any data type that behaves like a primitive (or atomic) data type (int, |
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* short, float, complex). The NVectorDimension defines the number of |
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* components in the vector array. |
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* |
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* CovariantVector is not a dynamically extendible array like std::vector. It is |
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* intended to be used like a mathematical vector. |
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* |
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* If you wish a simpler pixel types, you can use Scalar, which represents |
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* a single data value at a pixel. There is also the more complex type |
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* ScalarCovariantVector, which supports (for a given pixel) a single scalar value |
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* plus an array of vector values. (The scalar and vectors can be of |
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* different data type.) |
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* |
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* CovariantVector is the type that should be used for representing normals |
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* to surfaces and gradients of functions. AffineTransform transform |
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* covariant vectors different than vectors. |
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* |
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* \ingroup Geometry |
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* \ingroup DataRepresentation |
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* |
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* \sa Image |
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* \sa Mesh |
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* \sa Point |
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* \sa Vector |
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* \sa Matrix |
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*/ |
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template<class T, unsigned int NVectorDimension=3> |
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class ITK_EXPORT CovariantVector : public FixedArray<T,NVectorDimension> |
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{ |
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*public: |
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/** Standard class typedefs. */ |
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typedef CovariantVector Self; |
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typedef FixedArray<T,NVectorDimension> Superclass; |
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/** ValueType can be used to declare a variable that is the same type |
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* as a data element held in an CovariantVector. */ |
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typedef T ValueType; |
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typedef typename NumericTraits< ValueType >::RealType RealValueType; |
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/** Dimension of the Space */ |
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itkStaticConstMacro(Dimension, unsigned int, NVectorDimension); |
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/** I am a covariant vector. */ |
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typedef Self CovariantVectorType; |
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/** The Array type from which this CovariantVector is derived. */ |
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typedef FixedArray<T, NVectorDimension> BaseArray; |
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/** Get the dimension (size) of the vector. */ |
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static unsigned int GetCovariantVectorDimension() |
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{ return NVectorDimension; } |
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/** Set a vnl_vector_ref referencing the same memory block. */ |
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void SetVnlVector( const vnl_vector<T> & ); |
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/** Get a vnl_vector_ref referencing the same memory block. */ |
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vnl_vector_ref<T> GetVnlVector( void ); |
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/** Get a vnl_vector with a copy of the internal memory block. */ |
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vnl_vector<T> GetVnlVector( void ) const; |
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/** Set a vnl_vector_ref referencing the same memory block. |
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* \deprecated Use SetVnlVector() instead. */ |
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void Set_vnl_vector( const vnl_vector<T> & ); |
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/** Get a vnl_vector_ref referencing the same memory block. |
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* \deprecated Use GetVnlVector() instead. */ |
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vnl_vector_ref<T> Get_vnl_vector( void ); |
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/** Get a vnl_vector with a copy of the internal memory block. |
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* \deprecated Use GetVnlVector() instead. */ |
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vnl_vector<T> Get_vnl_vector( void ) const; |
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/** Default constructor has nothing to do. */ |
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CovariantVector(): BaseArray() {} |
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CovariantVector(const ValueType& r); |
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/** Pass-through constructor for the Array base class. */ |
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CovariantVector(const Self& r): BaseArray(r) {} |
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CovariantVector(const ValueType r[Dimension]): BaseArray(r) {} |
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/** Pass-through assignment operator for the Array base class. */ |
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CovariantVector& operator= (const Self& r); |
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CovariantVector& operator= (const ValueType r[NVectorDimension]); |
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/** Scalar operator*=. Scales elements by a scalar. */ |
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const Self& operator*=(const ValueType &value); |
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/** Scalar operator/=. Scales (divides) elements by a scalar. */ |
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const Self& operator/=(const ValueType &value); |
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/** CovariantVector operator+=. Adds a vectors to the current vector. */ |
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const Self& operator+=(const Self &vec); |
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/** CovariantVector operator-=. Subtracts a vector from a current vector. */ |
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const Self& operator-=(const Self &vec); |
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/** CovariantVector negation. Negate all the elements of a vector. Return a new vector */ |
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Self operator-() const; |
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/** CovariantVector addition. Add two vectors. Return a new vector. */ |
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Self operator+(const Self &vec) const; |
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/** CovariantVector subtraction. Subtract two vectors. Return a new vector. */ |
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Self operator-(const Self &vec) const; |
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/** Scalar operator*. Scale the elements of a vector by a scalar. |
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* Return a new vector. */ |
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Self operator*(const ValueType& val) const; |
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/** CovariantVector operator*. Performs the inner product of two covariant vectors. |
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* \warning This is equivalent to the scalar product only if the reference |
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* system has orthogonal axis and equal scales. */ |
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ValueType operator*(const Self &vec) const; |
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/** operator*. Performs the scalar product with a vector (contravariant). |
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* This scalar product is invariant under affine transformations */ |
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ValueType operator*(const Vector<T,NVectorDimension> &vec) const; |
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/** Scalar operator/. Scale (divide) the elements of a vector by a scalar. |
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* Return a new vector. */ |
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Self operator/(const ValueType& val) const; |
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/** Returns the Euclidean Norm of the vector */ |
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RealValueType GetNorm( void ) const; |
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/** Returns the number of components in this vector type */ |
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static unsigned int GetNumberOfComponents() { return NVectorDimension; } |
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/** Divides the covariant vector componets by the norm */ |
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void Normalize(void); |
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/** Returns vector's Squared Euclidean Norm */ |
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RealValueType GetSquaredNorm( void ) const; |
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/** Copy from another CovariantVector with a different representation type. |
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* Casting is done with C-Like rules */ |
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template < typename TCoordRepB > |
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void CastFrom( const CovariantVector<TCoordRepB,NVectorDimension> & pa ) |
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**{ |
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for(unsigned int i=0; i<NVectorDimension; i++ ) |
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{ |
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(*this)[i] = static_cast<T>( pa[i] ); |
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} |
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**} |
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}; |
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ITKCommon_EXPORT void CrossProduct( CovariantVector<double,3> &, |
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const Vector<double,3> &, |
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const Vector<double,3> & ); |
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ITKCommon_EXPORT void CrossProduct( CovariantVector<float,3> &, |
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const Vector<float,3> &, |
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const Vector<float,3> & ); |
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ITKCommon_EXPORT void CrossProduct( CovariantVector<int,3>, |
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const Vector<int,3> &, |
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const Vector<int,3> & ); |
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} // end namespace itk |
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#ifndef ITK_MANUAL_INSTANTIATION |
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#include "itkCovariantVector.txx" |
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#endif |
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#endif |
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