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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.
*
*=========================================================================*/
#include "itkFEMElementBase.h"
#include "itkFEMObject.h"
#include <iostream>
// Example taken from 'Fundamentals of the Finite ELement Method' - Grandin
int itkFEMElement2DC0LinearQuadrilateralStressTestFEMObject(int argc, char *argv[])
{
//Need to register default FEM object types,
//and setup SpatialReader to recognize FEM types
//which is all currently done as a HACK in
//the initializaiton of the itk::FEMFactoryBase::GetFactory()
itk::FEMFactoryBase::GetFactory()->RegisterDefaultTypes();
typedef itk::fem::FEMObject<2> FEMObjectType;
FEMObjectType::Pointer femObject = FEMObjectType::New();
itk::fem::Node::Pointer n1;
n1 = itk::fem::Node::New();
itk::fem::Element::VectorType pt(2);
pt[0] = 2.0;
pt[1] = 2.0;
n1->SetCoordinates(pt);
femObject->AddNextNode(n1.GetPointer());
n1 = itk::fem::Node::New();
pt[0] = 8.0;
pt[1] = 3.0;
n1->SetCoordinates(pt);
femObject->AddNextNode(n1.GetPointer());
n1 = itk::fem::Node::New();
pt[0] = 8.0;
pt[1] = 6.0;
n1->SetCoordinates(pt);
femObject->AddNextNode(n1.GetPointer());
n1 = itk::fem::Node::New();
pt[0] = 2.0;
pt[1] = 9.0;
n1->SetCoordinates(pt);
femObject->AddNextNode(n1.GetPointer());
femObject->RenumberNodeContainer();
itk::fem::MaterialLinearElasticity::Pointer m;
m = itk::fem::MaterialLinearElasticity::New();
m->SetGlobalNumber(0); /* Global number of the material */
m->SetYoungsModulus(30000000.0); /* Young modulus */
m->SetPoissonsRatio(0.3);
m->SetCrossSectionalArea(.0); /* Crossection area */
m->SetMomentOfInterita(1.0); /* Momemt of inertia */
femObject->AddNextMaterial(m.GetPointer());
itk::fem::Element2DC0LinearQuadrilateralStress::Pointer e1;
e1 = itk::fem::Element2DC0LinearQuadrilateralStress::New();
e1->SetGlobalNumber(0);
e1->SetNode( 0, femObject->GetNode(0).GetPointer() );
e1->SetNode( 1, femObject->GetNode(1).GetPointer() );
e1->SetNode( 2, femObject->GetNode(2).GetPointer() );
e1->SetNode( 3, femObject->GetNode(3).GetPointer() );
e1->SetMaterial( femObject->GetMaterial(0).GetPointer() );
femObject->AddNextElement( e1.GetPointer());
itk::fem::LoadBC::Pointer l1;
l1 = itk::fem::LoadBC::New();
l1->SetElement( femObject->GetElement(0) )
l1->SetDegreeOfFreedom(0);
l1->SetValue( vnl_vector<double>(0, 0.0) );
femObject->AddNextLoad( l1 );
l1 = itk::fem::LoadBC::New();
l1->SetElement( femObject->GetElement(0) )
l1->SetDegreeOfFreedom(1);
l1->SetValue( vnl_vector<double>(1, 0.0) );
femObject->AddNextLoad( l1 );
l1 = itk::fem::LoadBC::New();
l1->SetElement( femObject->GetElement(0) );
l1->SetDegreeOfFreedom(6);
l1->SetValue( vnl_vector<double>(1, 0.0) );
femObject->AddNextLoad( l1 );
l1 = itk::fem::LoadBC::New();
l1->SetElement( femObject->GetElement(0) );
l1->SetDegreeOfFreedom(7);
l1->SetValue( vnl_vector<double>(1, 0.0) );
femObject->AddNextLoad( l1 );
itk::fem::LoadNode::Pointer l2;
l2 = itk::fem::LoadNode::New();
l2->SetElement( femObject->GetElement(0) );
l2->SetNode(1);
vnl_vector<double> F(2);
F[0] = 5;
F[1] = 0;
l2->SetForce(F);
femObject->AddNextLoad( l2 );
l2 = itk::fem::LoadNode::New();
l2->SetElement( femObject->GetElement(0) );
l2->SetNode(2);
vnl_vector<double> F1(2);
F1[0] = 10;
F1[1] = 0;
l2->SetForce(F1);
femObject->AddNextLoad( l2 );
femObject->Solve();
float soln[8];
for( int i = 0; i < 8; i++ )
{
soln[i] = femObject->GetSolution(i);
std::cout << "Solution[" << i << "]:" << soln[i] << std::endl;
}
std::cout << "Test PASSED!" << std::endl;
return EXIT_SUCCESS;
}
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