/usr/include/ITK-4.9/itkParametricPath.hxx is in libinsighttoolkit4-dev 4.9.0-4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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 itkParametricPath_hxx
#define itkParametricPath_hxx
#include "itkParametricPath.h"
#include "itkMath.h"
namespace itk
{
/**
* Constructor
*/
template< unsigned int VDimension >
ParametricPath< VDimension >
::ParametricPath()
{
m_DefaultInputStepSize = 0.3;
}
template< unsigned int VDimension >
typename ParametricPath< VDimension >::IndexType
ParametricPath< VDimension >
::EvaluateToIndex(const InputType & input) const
{
ContinuousIndexType continuousIndex;
IndexType index;
continuousIndex = this->Evaluate(input);
// Round each coordinate to the nearest integer value
for ( unsigned int i = 0; i < VDimension; i++ )
{
index[i] = static_cast< IndexValueType >( continuousIndex[i] + 0.5 );
}
return index;
}
template< unsigned int VDimension >
typename ParametricPath< VDimension >::OffsetType
ParametricPath< VDimension >
::IncrementInput(InputType & input) const
{
int iterationCount;
bool tooSmall;
bool tooBig;
InputType inputStepSize;
InputType finalInputValue;
OffsetType offset;
IndexType currentImageIndex;
IndexType nextImageIndex;
IndexType finalImageIndex;
iterationCount = 0;
inputStepSize = m_DefaultInputStepSize;
// Are we already at (or past) the end of the input?
finalInputValue = this->EndOfInput();
currentImageIndex = this->EvaluateToIndex(input);
finalImageIndex = this->EvaluateToIndex(finalInputValue);
offset = finalImageIndex - currentImageIndex;
if ( ( offset == this->GetZeroOffset() && Math::NotExactlyEquals(input, this->StartOfInput()) )
|| ( input >= finalInputValue ) )
{
return this->GetZeroOffset();
}
do
{
if ( iterationCount++ > 10000 ) { itkExceptionMacro(<< "Too many iterations"); }
nextImageIndex = this->EvaluateToIndex(input + inputStepSize);
offset = nextImageIndex - currentImageIndex;
tooBig = false;
tooSmall = ( offset == this->GetZeroOffset() );
if ( tooSmall )
{
// double the input step size, but don't go past the end of the input
inputStepSize *= 2;
if ( ( input + inputStepSize ) >= finalInputValue )
{
inputStepSize = finalInputValue - input;
}
}
else
{
// Search for an offset dimension that is too big
for ( unsigned int i = 0; i < VDimension && !tooBig; i++ )
{
tooBig = ( offset[i] >= 2 || offset[i] <= -2 );
}
if ( tooBig )
{
inputStepSize /= 1.5;
}
}
}
while ( tooSmall || tooBig );
input += inputStepSize;
return offset;
}
template< unsigned int VDimension >
typename ParametricPath< VDimension >::VectorType
ParametricPath< VDimension >
::EvaluateDerivative(const InputType & input) const
{
InputType inputStepSize;
inputStepSize = m_DefaultInputStepSize;
if ( ( input + inputStepSize ) >= this->EndOfInput() )
{
inputStepSize = this->EndOfInput() - input;
}
return ( this->Evaluate(input + inputStepSize) - this->Evaluate(input) ) / inputStepSize;
}
template< unsigned int VDimension >
void
ParametricPath< VDimension >
::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "DefaultInputSize: " << m_DefaultInputStepSize << std::endl;
}
} // end namespaceitk
#endif
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