VolumeConstraintPottsUpdateRule.cpp

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#include "VolumeConstraintPottsUpdateRule.hpp"

template<unsigned DIM>
VolumeConstraintPottsUpdateRule<DIM>::VolumeConstraintPottsUpdateRule()
    : AbstractPottsUpdateRule<DIM>(),
      mDeformationEnergyParameter(0.5), // Educated guess
      mMatureCellTargetVolume(16.0) // Defaults to a 4*4 cell size
{
}

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

template<unsigned DIM>
double VolumeConstraintPottsUpdateRule<DIM>::EvaluateHamiltonianContribution(unsigned currentNodeIndex,
                                                                        unsigned targetNodeIndex,
                                                                        PottsBasedCellPopulation<DIM>& rCellPopulation)
{
    double delta_H = 0.0;

    std::set<unsigned> containing_elements = rCellPopulation.GetNode(currentNodeIndex)->rGetContainingElementIndices();
    std::set<unsigned> new_location_containing_elements = rCellPopulation.GetNode(targetNodeIndex)->rGetContainingElementIndices();

    bool current_node_contained = !containing_elements.empty();
    bool target_node_contained = !new_location_containing_elements.empty();

    // Every node must each be in at most one element
    assert(new_location_containing_elements.size() < 2);

    if (!current_node_contained && !target_node_contained)
    {
        EXCEPTION("At least one of the current node or target node must be in an element.");
    }

    if (current_node_contained && target_node_contained)
    {
        if (*(new_location_containing_elements.begin()) == *(containing_elements.begin()))
        {
            EXCEPTION("The current node and target node must not be in the same element.");
        }
    }

    if (current_node_contained) // current node is in an element
    {
        unsigned current_element = (*containing_elements.begin());
        double current_volume = rCellPopulation.rGetMesh().GetVolumeOfElement(current_element);
        double current_volume_difference = current_volume - mMatureCellTargetVolume;

        delta_H += mDeformationEnergyParameter*((current_volume_difference + 1.0)*(current_volume_difference + 1.0) - current_volume_difference*current_volume_difference);
    }
    if (target_node_contained) // target node is in an element
    {
        unsigned target_element = (*new_location_containing_elements.begin());
        double target_volume = rCellPopulation.rGetMesh().GetVolumeOfElement(target_element);
        double target_volume_difference = target_volume - mMatureCellTargetVolume;

        delta_H += mDeformationEnergyParameter*((target_volume_difference - 1.0)*(target_volume_difference - 1.0) - target_volume_difference*target_volume_difference);
    }

    return delta_H;
}

template<unsigned DIM>
double VolumeConstraintPottsUpdateRule<DIM>::GetDeformationEnergyParameter()
{
    return mDeformationEnergyParameter;
}

template<unsigned DIM>
void VolumeConstraintPottsUpdateRule<DIM>::SetDeformationEnergyParameter(double deformationEnergyParameter)
{
    mDeformationEnergyParameter = deformationEnergyParameter;
}

template<unsigned DIM>
double VolumeConstraintPottsUpdateRule<DIM>::GetMatureCellTargetVolume() const
{
    return mMatureCellTargetVolume;
}

template<unsigned DIM>
void VolumeConstraintPottsUpdateRule<DIM>::SetMatureCellTargetVolume(double matureCellTargetVolume)
{
    assert(matureCellTargetVolume >= 0.0);
    mMatureCellTargetVolume = matureCellTargetVolume;
}

template<unsigned DIM>
void VolumeConstraintPottsUpdateRule<DIM>::OutputUpdateRuleParameters(out_stream& rParamsFile)
{
    *rParamsFile << "\t\t\t<DeformationEnergyParameter>" << mDeformationEnergyParameter << "</DeformationEnergyParameter>\n";
    *rParamsFile << "\t\t\t<MatureCellTargetVolume>" << mMatureCellTargetVolume << "</MatureCellTargetVolume>\n";

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

// Explicit instantiation
template class VolumeConstraintPottsUpdateRule<1>;
template class VolumeConstraintPottsUpdateRule<2>;
template class VolumeConstraintPottsUpdateRule<3>;

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