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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkParametricPath.txx.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:43 $ |
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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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DEF |
#ifndef _itkParametricPath_txx |
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DEF |
#define _itkParametricPath_txx |
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#include "itkParametricPath.h" |
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namespace itk |
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{ |
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/** |
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* Constructor |
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*/ |
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template <unsigned int VDimension> |
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ParametricPath<VDimension> |
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::ParametricPath() |
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{ |
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m_DefaultInputStepSize = 0.3; |
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} |
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template<unsigned int VDimension> |
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typename ParametricPath<VDimension>::IndexType |
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ParametricPath<VDimension> |
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::EvaluateToIndex( const InputType & input ) const |
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{ |
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ContinuousIndexType continuousIndex; |
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IndexType index; |
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continuousIndex = Evaluate( input ); |
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// Round each coordinate to the nearest integer value |
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for( unsigned int i=0; i<VDimension; i++ ) |
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{ |
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index[i] = (typename IndexType::IndexValueType)( continuousIndex[i] + 0.5 ); |
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} |
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return index; |
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} |
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EML |
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template<unsigned int VDimension> |
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typename ParametricPath<VDimension>::OffsetType |
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ParametricPath<VDimension> |
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::IncrementInput(InputType & input) const |
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{ |
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int iterationCount; |
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bool tooSmall; |
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bool tooBig; |
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InputType inputStepSize; |
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InputType finalInputValue; |
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OffsetType offset; |
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IndexType currentImageIndex; |
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IndexType nextImageIndex; |
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IndexType finalImageIndex; |
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iterationCount = 0; |
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inputStepSize = m_DefaultInputStepSize; |
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// Are we already at (or past) the end of the input? |
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finalInputValue = this->EndOfInput(); |
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currentImageIndex = this->EvaluateToIndex( input ); |
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finalImageIndex = this->EvaluateToIndex( finalInputValue ); |
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offset = finalImageIndex - currentImageIndex; |
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if( ( offset == this->GetZeroOffset() && input != this->StartOfInput() ) || |
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*******( input >=finalInputValue ) ) |
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{ |
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return this->GetZeroOffset(); |
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} |
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do |
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{ |
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if( iterationCount++ > 10000 ) {itkExceptionMacro(<<"Too many iterations");} |
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nextImageIndex = this->EvaluateToIndex( input + inputStepSize ); |
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offset = nextImageIndex - currentImageIndex; |
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tooBig = false; |
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tooSmall = ( offset == this->GetZeroOffset() ); |
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if( tooSmall ) |
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{ |
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// double the input step size, but don't go past the end of the input |
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inputStepSize *= 2; |
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if( (input + inputStepSize) >= finalInputValue ) |
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{ |
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inputStepSize = finalInputValue - input; |
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} |
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} |
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else |
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{ |
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// Search for an offset dimension that is too big |
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for( unsigned int i=0; i<VDimension && !tooBig; i++ ) |
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{ |
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tooBig = ( offset[i] >= 2 || offset[i] <= -2 ); |
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} |
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if( tooBig ) |
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{ |
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inputStepSize /= 1.5; |
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} |
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} |
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} |
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while( tooSmall || tooBig ); |
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input += inputStepSize; |
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return offset; |
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} |
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template<unsigned int VDimension> |
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typename ParametricPath<VDimension>::VectorType |
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ParametricPath<VDimension> |
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::EvaluateDerivative(const InputType & input) const |
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{ |
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InputType inputStepSize; |
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inputStepSize = m_DefaultInputStepSize; |
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if( (input + inputStepSize) >= this->EndOfInput() ) |
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{ |
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inputStepSize = this->EndOfInput() - input; |
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} |
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return ( Evaluate(input + inputStepSize) - Evaluate(input) ) / inputStepSize; |
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} |
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template<unsigned int VDimension> |
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void |
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ParametricPath<VDimension> |
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::PrintSelf (std::ostream &os, Indent indent) const |
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{ |
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Superclass::PrintSelf(os, indent); |
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os << indent << "DefaultInputSize: " << m_DefaultInputStepSize << std::endl; |
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} |
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} // end namespaceitk |
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#endif |
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