VertexCryptBoundaryForce.cpp

/*

Copyright (C) University of Oxford, 2005-2011

University of Oxford means the Chancellor, Masters and Scholars of the
University of Oxford, having an administrative office at Wellington
Square, Oxford OX1 2JD, UK.

This file is part of Chaste.

Chaste is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 2.1 of the License, or
(at your option) any later version.

Chaste is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details. The offer of Chaste under the terms of the
License is subject to the License being interpreted in accordance with
English Law and subject to any action against the University of Oxford
being under the jurisdiction of the English Courts.

You should have received a copy of the GNU Lesser General Public License
along with Chaste. If not, see <http://www.gnu.org/licenses/>.

*/

#include "VertexCryptBoundaryForce.hpp"
#include "MathsCustomFunctions.hpp"

template<unsigned DIM>
VertexCryptBoundaryForce<DIM>::VertexCryptBoundaryForce(double forceStrength)
   : AbstractForce<DIM>(),
     mForceStrength(forceStrength)
{
    // We don't want the force to act in the wrong direction
    assert(mForceStrength > 0.0);
}

template<unsigned DIM>
VertexCryptBoundaryForce<DIM>::~VertexCryptBoundaryForce()
{
}

template<unsigned DIM>
void VertexCryptBoundaryForce<DIM>::AddForceContribution(std::vector<c_vector<double, DIM> >& rForces,
                                                         AbstractCellPopulation<DIM>& rCellPopulation)
{
    // Helper variable that is a static cast of the cell population
    VertexBasedCellPopulation<DIM>* p_cell_population = static_cast<VertexBasedCellPopulation<DIM>*>(&rCellPopulation);

    // Throw an exception message if not using a VertexBasedCellPopulation
    if (dynamic_cast<VertexBasedCellPopulation<DIM>*>(&rCellPopulation) == NULL)
    {
        EXCEPTION("VertexCryptBoundaryForce is to be used with VertexBasedCellPopulations only");
    }

    // Iterate over nodes
    for (typename AbstractMesh<DIM,DIM>::NodeIterator node_iter = p_cell_population->rGetMesh().GetNodeIteratorBegin();
         node_iter != p_cell_population->rGetMesh().GetNodeIteratorEnd();
         ++node_iter)
    {
        double y = node_iter->rGetLocation()[1]; // y-coordinate of node

        // If the node lies below the line y=0, then add the boundary force contribution to rForces
        if (y < 0.0)
        {
            c_vector<double, DIM> boundary_force = zero_vector<double>(DIM);
            boundary_force[1] = mForceStrength*SmallPow(y, 2);

            rForces[node_iter->GetIndex()] += boundary_force;
        }
    }
}

template<unsigned DIM>
double VertexCryptBoundaryForce<DIM>::GetForceStrength() const
{
    return mForceStrength;
}

template<unsigned DIM>
void VertexCryptBoundaryForce<DIM>::OutputForceParameters(out_stream& rParamsFile)
{
    *rParamsFile << "\t\t\t<ForceStrength>" << mForceStrength << "</ForceStrength>\n";

    // Call method on direct parent class
    AbstractForce<DIM>::OutputForceParameters(rParamsFile);
}

// Explicit instantiation

template class VertexCryptBoundaryForce<1>;
template class VertexCryptBoundaryForce<2>;
template class VertexCryptBoundaryForce<3>;


// Serialization for Boost >= 1.36
#include "SerializationExportWrapperForCpp.hpp"
EXPORT_TEMPLATE_CLASS_SAME_DIMS(VertexCryptBoundaryForce)