ITK  4.1.0
Insight Segmentation and Registration Toolkit
itkCrossHelper.h
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00001 /*=========================================================================
00002  *
00003  *  Copyright Insight Software Consortium
00004  *
00005  *  Licensed under the Apache License, Version 2.0 (the "License");
00006  *  you may not use this file except in compliance with the License.
00007  *  You may obtain a copy of the License at
00008  *
00009  *         http://www.apache.org/licenses/LICENSE-2.0.txt
00010  *
00011  *  Unless required by applicable law or agreed to in writing, software
00012  *  distributed under the License is distributed on an "AS IS" BASIS,
00013  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  *  See the License for the specific language governing permissions and
00015  *  limitations under the License.
00016  *
00017  *=========================================================================*/
00018 #ifndef __itkCrossHelper_h
00019 #define __itkCrossHelper_h
00020 
00021 #include "itkNumericTraits.h"
00022 
00023 namespace itk
00024 {
00035 template< typename TVector >
00036 class CrossHelper
00037 {
00038 public:
00039   typedef TVector                        VectorType;
00040   typedef typename VectorType::ValueType ValueType;
00041 
00042   itkStaticConstMacro (Dimension, unsigned int, VectorType::Dimension);
00043 
00049   VectorType operator()(const VectorType & iU,
00050                         const VectorType & iV) const
00051   {
00052     VectorType oCross;
00053 
00054     if ( Dimension > 2 )
00055       {
00056       oCross[0] = iU[1] * iV[2] - iV[1] * iU[2];
00057       oCross[1] = iV[0] * iU[2] - iU[0] * iV[2];
00058       oCross[2] = iU[0] * iV[1] - iV[0] * iU[1];
00059 
00060       for ( unsigned int dim = 3; dim < Dimension; dim++ )
00061         {
00062         oCross[dim] = 0.0;
00063         }
00064       }
00065     else
00066       {
00067       oCross.Fill(0.);
00068       }
00069 
00070     return oCross;
00071   }
00072 };
00073 }
00074 
00075 #endif
00076