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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkImageRegionSplitter.txx.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:39 $ |
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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 _itkImageRegionSplitter_txx |
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DEF |
#define _itkImageRegionSplitter_txx |
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#include "itkImageRegionSplitter.h" |
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#include <math.h> |
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namespace itk |
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{ |
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/** |
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* |
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*/ |
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template <unsigned int VImageDimension> |
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unsigned int |
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ImageRegionSplitter<VImageDimension> |
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::GetNumberOfSplits(const RegionType ®ion, unsigned int requestedNumber) |
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{ |
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int splitAxis; |
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const SizeType ®ionSize = region.GetSize(); |
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// split on the outermost dimension available |
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splitAxis = VImageDimension - 1; |
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while (regionSize[splitAxis] == 1) |
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{ |
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--splitAxis; |
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if (splitAxis < 0) |
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{ // cannot split |
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itkDebugMacro(" Cannot Split"); |
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return 1; |
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} |
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} |
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// determine the actual number of pieces that will be generated |
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SizeValueType range = regionSize[splitAxis]; |
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int valuesPerPiece = (int)::ceil(range/(double)requestedNumber); |
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int maxPieceUsed = (int)::ceil(range/(double)valuesPerPiece) - 1; |
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return maxPieceUsed + 1; |
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} |
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/** |
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* |
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*/ |
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template <unsigned int VImageDimension> |
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ImageRegion<VImageDimension> |
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ImageRegionSplitter<VImageDimension> |
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::GetSplit(unsigned int i, unsigned int numberOfPieces, |
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const RegionType ®ion) |
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{ |
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int splitAxis; |
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RegionType splitRegion; |
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IndexType splitIndex; |
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SizeType splitSize, regionSize; |
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// Initialize the splitRegion to the requested region |
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splitRegion = region; |
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splitIndex = splitRegion.GetIndex(); |
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splitSize = splitRegion.GetSize(); |
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regionSize = region.GetSize(); |
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// split on the outermost dimension available |
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splitAxis = VImageDimension - 1; |
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while (regionSize[splitAxis] == 1) |
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{ |
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--splitAxis; |
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if (splitAxis < 0) |
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{ // cannot split |
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itkDebugMacro(" Cannot Split"); |
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return splitRegion; |
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} |
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} |
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// determine the actual number of pieces that will be generated |
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SizeValueType range = regionSize[splitAxis]; |
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int valuesPerPiece = (int)::ceil(range/(double)numberOfPieces); |
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int maxPieceUsed = (int)::ceil(range/(double)valuesPerPiece) - 1; |
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// Split the region |
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if ((int) i < maxPieceUsed) |
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{ |
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splitIndex[splitAxis] += i*valuesPerPiece; |
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splitSize[splitAxis] = valuesPerPiece; |
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} |
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if ((int) i == maxPieceUsed) |
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{ |
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splitIndex[splitAxis] += i*valuesPerPiece; |
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// last piece needs to process the "rest" dimension being split |
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splitSize[splitAxis] = splitSize[splitAxis] - i*valuesPerPiece; |
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} |
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// set the split region ivars |
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splitRegion.SetIndex( splitIndex ); |
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splitRegion.SetSize( splitSize ); |
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itkDebugMacro(" Split Piece: " << splitRegion ); |
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return splitRegion; |
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} |
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/** |
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* |
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*/ |
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template <unsigned int VImageDimension> |
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void |
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ImageRegionSplitter<VImageDimension> |
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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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} |
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} // end namespace itk |
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#endif |
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