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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef sitkTemplateFunctions_h
#define sitkTemplateFunctions_h
#include "sitkMacro.h"
#include "sitkCommon.h"
#include "sitkExceptionObject.h"
#include <vector>
#include <ostream>
#include <iterator>
namespace itk {
template<unsigned int VImageDimension> class ImageRegion;
namespace simple {
/** \brief A function which does nothing
*
* This function is to be used to mark parameters as unused to supress
* compiler warning.
*/
template <typename T>
void SITKCommon_HIDDEN Unused( const T &) {};
/**
* \brief Output the element of an std::vector to the output stream
*
* The elements of the std::vector are required to have operator<<.
*
* The format of the output should be "[ T, T, T ]".
*/
template <typename T>
SITKCommon_HIDDEN std::ostream & operator<<( std::ostream & os, const std::vector<T>& v)
{
if ( v.empty() )
{
return os << "[ ]";
}
os << "[ ";
std::copy( v.begin(), v.end()-1, std::ostream_iterator<T>(os, ", ") );
return os << v.back() << " ]";
}
template< typename TITKPointVector, typename TType>
TITKPointVector SITKCommon_HIDDEN sitkSTLVectorToITKPointVector( const std::vector< TType > & in )
{
typedef TITKPointVector itkPointVectorType;
itkPointVectorType out;
unsigned int Dimension = itkPointVectorType::value_type::GetPointDimension();
for( unsigned int i = 0; i <= in.size()- Dimension; i += Dimension )
{
typename itkPointVectorType::value_type pt(&in[i]);
out.push_back(pt);
}
return out;
}
/** \brief Copy the elements of an std::vector into an ITK fixed width vector
*
* If there are more elements in paramter "in" than the templated ITK
* vector type, they are truncated. If less, then an exception is
* generated.
*/
template< typename TITKVector, typename TType>
TITKVector SITKCommon_HIDDEN sitkSTLVectorToITK( const std::vector< TType > & in )
{
typedef TITKVector itkVectorType;
if ( in.size() < itkVectorType::Dimension )
{
sitkExceptionMacro(<<"Unable to convert vector to ITK type\n"
<< "Expected vector of length " << itkVectorType::Dimension
<< " but only got " << in.size() << " elements." );
}
itkVectorType out;
for( unsigned int i = 0; i < itkVectorType::Dimension; ++i )
{
out[i] = in[i];
}
return out;
}
/** \brief Convert an ITK fixed width vector to a std::vector
*/
template<typename TType, typename TITKVector>
std::vector<TType> SITKCommon_HIDDEN sitkITKVectorToSTL( const TITKVector & in )
{
std::vector<TType> out( TITKVector::Dimension );
for( unsigned int i = 0; i < TITKVector::Dimension; ++i )
{
out[i] = static_cast<TType>(in[i]);
}
return out;
}
template<typename TType, typename TITKVector>
std::vector<TType> SITKCommon_HIDDEN sitkITKVectorToSTL( const std::vector<TITKVector> & in )
{
std::vector<TType> out;
out.reserve( in.size()*TITKVector::Dimension );
typename std::vector<TITKVector>::const_iterator iter = in.begin();
while(iter!=in.end())
{
for( unsigned int i = 0; i < TITKVector::Dimension; ++i )
{
out.push_back(static_cast<TType>((*iter)[i]));
}
++iter;
}
return out;
}
/** \brief Convert an ITK ImageRegion to and std::vector with the
* first part being the start index followed by the size.
*/
template<unsigned int VImageDimension>
std::vector<unsigned int> SITKCommon_HIDDEN sitkITKImageRegionToSTL( const ImageRegion<VImageDimension> & in )
{
std::vector<unsigned int> out( VImageDimension*2 );
for( unsigned int i = 0; i < VImageDimension; ++i )
{
out[i] = static_cast<unsigned int>(in.GetIndex(i));
out[VImageDimension+i] = static_cast<unsigned int>(in.GetSize(i));
}
return out;
}
/* \brief Convert to an itk::Matrix type, where the vector is in row
* major form. If the vector is of 0-size then an identity matrix will
* be constructed.
*/
template< typename TDirectionType >
TDirectionType SITKCommon_HIDDEN sitkSTLToITKDirection( const std::vector<double> &direction )
{
TDirectionType itkDirection;
if ( direction.size() == 0 )
{
itkDirection.SetIdentity();
}
else if( direction.size() == TDirectionType::RowDimensions*TDirectionType::ColumnDimensions )
{
std::copy( direction.begin(), direction.end(), itkDirection.GetVnlMatrix().begin() );
}
else
{
sitkExceptionMacro(<<"Length of input ("<<direction.size()<<") does not match matrix dimensions ("
<<TDirectionType::RowDimensions<<", "<<TDirectionType::ColumnDimensions<<").\n");
}
return itkDirection;
}
template< typename TDirectionType >
std::vector<double> SITKCommon_HIDDEN sitkITKDirectionToSTL( const TDirectionType & d)
{
return std::vector<double>( d.GetVnlMatrix().begin(), d.GetVnlMatrix().end() );
}
}
}
#endif
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