SemMeshGenerator.cpp

/*

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*/

#include "SemMeshGenerator.hpp"

template<unsigned DIM>
SemMeshGenerator<DIM>::SemMeshGenerator(unsigned numCellsAcross,
                                            unsigned numCellsUp,
                                            unsigned numCellsDeep,
                                            unsigned numSubCellularElementsPerCellAcross,
                                            unsigned numSubCellularElementsPerCellUp,
                                            unsigned numSubCellularElementsPerCellDeep)
{
    mTotalSubcellularElementsPerCell = numSubCellularElementsPerCellAcross + numSubCellularElementsPerCellUp + numSubCellularElementsPerCellDeep;

    // Check input is of correct type
    if (numCellsAcross == 0)
    {
        EXCEPTION("An SemMeshGenerator must have numCellsAcross > 0");
    }
    if (numSubCellularElementsPerCellAcross == 0)
    {
        EXCEPTION("An SemMeshGenerator must have more than 1 subcellular element per cell. Set numSubCellularElementsPerCell > 0");
    }

    // Make sure the dimensions match the number of cells up/deep
    if (DIM == 1)
    {
        EXCEPTION("Trying to create a 1D mesh, SemMesh only defined for 2 and 3D");
    }
    if (numCellsDeep > 1 && DIM < 3)
    {
        EXCEPTION("Trying to create a 3D SemMesh with DIM < 3");
    }

    mTotalSubcellularElementsPerCell = numSubCellularElementsPerCellAcross*+ numSubCellularElementsPerCellUp * numSubCellularElementsPerCellDeep;

    double packing_density_of_spheres_2d = M_PI / (2.0 * sqrt(3.0));
    double packing_density_of_spheres_3d = M_PI / (3.0 * sqrt(2.0));


    double equlibrium_distance;
    switch (DIM)
    {
        case 2:
        {
            equlibrium_distance = 2.0 * sqrt(packing_density_of_spheres_2d / mTotalSubcellularElementsPerCell);
            break;
        }
        case 3:
        {
            equlibrium_distance = 2.0 * pow((packing_density_of_spheres_3d / mTotalSubcellularElementsPerCell), 1.0/3.0);
            break;
        }
        default:
        {
            NEVER_REACHED;
        }
    }

    mNodeEquilibriumDistance = equlibrium_distance;

    // Create a cube of nodes for each cell.
    std::vector<PottsElement<DIM>* > elements;
    std::vector<Node<DIM>* > nodes;

    unsigned node_index_counter = 0;
    unsigned element_counter = 0;
    for (unsigned cells_deep = 0; cells_deep < numCellsDeep; cells_deep++)                                          // Cells in the z direction
    {
        for (unsigned cells_up = 0; cells_up < numCellsUp; cells_up++)                                                  // Cells in the y direction
        {
            for (unsigned cells_across = 0; cells_across < numCellsAcross; cells_across++)                                  // Cells in the x direction
            {
                std::vector<Node<DIM>* > local_nodes;
                for (unsigned nodes_deep = 0; nodes_deep < numSubCellularElementsPerCellDeep; nodes_deep++)                     // Nodes (subcellular elements) in the z direction
                {
                    for (unsigned nodes_up = 0; nodes_up < numSubCellularElementsPerCellUp; nodes_up++)                             // Nodes (subcellular elements) in the y direction
                    {
                        for (unsigned nodes_across = 0; nodes_across < numSubCellularElementsPerCellAcross; nodes_across++)             // Nodes (subcellular elements) in the x direction
                        {
                            Node<DIM>* p_node = new Node<DIM>(node_index_counter++,
                                                                false,
                                                                ((cells_across * numSubCellularElementsPerCellAcross + nodes_across) * equlibrium_distance),
                                                                ((cells_up * numSubCellularElementsPerCellUp + nodes_up) * equlibrium_distance),
                                                                ((cells_deep * numSubCellularElementsPerCellDeep + nodes_deep) * equlibrium_distance));
                            local_nodes.push_back(p_node);
                            nodes.push_back(p_node);
                        }
                    }
                }
                elements.push_back(new PottsElement<DIM>(element_counter++, local_nodes));
            }
        }
    }

    mpMesh = new SemMesh<DIM>(nodes, elements);
}

template<unsigned DIM>
SemMeshGenerator<DIM>::~SemMeshGenerator()
{
    delete mpMesh;
}

template<unsigned DIM>
double SemMeshGenerator<DIM>::GetEquilibriumDistance()
{
    return mNodeEquilibriumDistance;
}

template<unsigned DIM>
SemMesh<DIM>* SemMeshGenerator<DIM>::GetMesh()
{
    return mpMesh;
}

// Explicit instantiation

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