itkFEMElement2DC0LinearTriangular.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkFEMElement2DC0LinearTriangular.h,v $
00005   Language:  C++
00006   Date:      $Date: 2009-01-28 21:29:04 $
00007   Version:   $Revision: 1.7 $
00008 
00009   Copyright (c) Insight Software Consortium. All rights reserved.
00010   See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
00011 
00012      This software is distributed WITHOUT ANY WARRANTY; without even 
00013      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
00014      PURPOSE.  See the above copyright notices for more information.
00015 
00016 =========================================================================*/
00017 
00018 #ifndef __itkFEMElement2DC0LinearTriangular_h
00019 #define __itkFEMElement2DC0LinearTriangular_h
00020 
00021 #include "itkFEMElementStd.h"
00022 
00023 namespace itk {
00024 namespace fem {
00025 
00030 class Element2DC0LinearTriangular : public ElementStd<3,2>
00031 {
00032   typedef ElementStd<3,2> TemplatedParentClass;
00033   FEM_ABSTRACT_CLASS( Element2DC0LinearTriangular, TemplatedParentClass )
00034 public:
00035 
00036 
00038 
00042   enum { DefaultIntegrationOrder = 1 };
00043 
00044   virtual void GetIntegrationPointAndWeight(unsigned int i, VectorType& pt, Float& w, unsigned int order) const;
00045 
00046   virtual unsigned int GetNumberOfIntegrationPoints(unsigned int order) const;
00047 
00049 
00053   virtual VectorType ShapeFunctions( const VectorType& pt ) const;
00054 
00055   virtual void ShapeFunctionDerivatives( const VectorType& pt, MatrixType& shapeD ) const;
00056 
00057   // FIXME: Write a proper implementation
00058   virtual bool GetLocalFromGlobalCoordinates( const VectorType& globalPt , VectorType& localPt) const;
00059 
00060   // Since the Jacobian is not quadratic, we need to provide our
00061   // own implementation of calculating the determinant and inverse.
00062   virtual Float JacobianDeterminant( const VectorType& pt, const MatrixType* pJ = 0 ) const;
00063   virtual void JacobianInverse( const VectorType& pt, MatrixType& invJ, const MatrixType* pJ = 0 ) const;
00064 
00068 #ifdef FEM_BUILD_VISUALIZATION
00069   void Draw(CDC* pDC, Solution::ConstPointer sol) const;
00070 #endif
00071 
00075   static const Float trigGaussRuleInfo[6][7][4];
00076 
00081   static const unsigned int Nip[6];
00082 
00083 };
00084 
00085 }} // end namespace itk::fem
00086 
00087 #endif  // #ifndef __itkFEMElement2DC0LinearTriangular_h
00088