itkFEMElement2DC0LinearLine.h

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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 __itkFEMElement2DC0LinearLine_h
#define __itkFEMElement2DC0LinearLine_h

#include "itkFEMElementStd.h"

namespace itk
{
namespace fem
{
class Element2DC0LinearLine : public ElementStd<2, 2>
{
public:

  typedef Element2DC0LinearLine    Self;
  typedef ElementStd<2, 2>         TemplatedParentClass;
  typedef TemplatedParentClass     Superclass;
  typedef SmartPointer<Self>       Pointer;
  typedef SmartPointer<const Self> ConstPointer;

  itkTypeMacro(Element2DC0LinearLine, TemplatedParentClass);

  // ////////////////////////////////////////////////////////////////////////
  enum { DefaultIntegrationOrder = 1 };

  virtual void GetIntegrationPointAndWeight(unsigned int i,
                                            VectorType & pt,
                                            Float & w,
                                            unsigned int order) const;

  virtual unsigned int GetNumberOfIntegrationPoints(unsigned int order) const;

  // ////////////////////////////////////////////////////////////////////////
  virtual VectorType ShapeFunctions(const VectorType & pt) const;

  virtual void ShapeFunctionDerivatives(const VectorType & pt, MatrixType & shapeD) const;

  virtual bool GetLocalFromGlobalCoordinates(const VectorType & globalPt,
                                             VectorType & localPt) const;

  virtual void Jacobian(const VectorType & pt, MatrixType & J, const MatrixType *pshapeD = 0) const;

  Float DistanceToLine(const VectorType & x, const VectorType & p1, const VectorType & p2, Float & t,
                       VectorType & closestPoint) const;

protected:
  virtual void PrintSelf(std::ostream& os, Indent indent) const;

  virtual void PopulateEdgeIds(void); // HACK:  Should PopulateEdgeIds
                                      // be const or not in this
                                      // heirarchy. Sometimes it is,
                                      // sometimes it is not.

};
}
}  // end namespace itk::fem

#endif  // #ifndef __itkFEMElement2DC0LinearLine_h