RandomFieldMeshElementParameter.h

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#pragma once
 
#include "Parameter.h"
 
namespace MeshLib
{
template <typename T>
class PropertyVector;
}  // namespace MeshLib
 
namespace ParameterLib
{
template <typename T>
struct RandomFieldMeshElementParameter final : public Parameter<T>
{
    RandomFieldMeshElementParameter(std::string const& name_,
                                    MeshLib::Mesh& mesh,
                                    MeshLib::PropertyVector<T> const& property)
        : Parameter<T>(name_, &mesh), _property(property)
    {
    }
 
    bool isTimeDependent() const override { return false; }
 
    int getNumberOfGlobalComponents() const override
    {
        return _property.getNumberOfGlobalComponents();
    }
 
    std::vector<T> operator()(double const /*t*/,
                              SpatialPosition const& pos) const override
    {
        auto const e = pos.getElementID();
        if (!e)
        {
            OGS_FATAL(
                "Trying to access a RandomFieldMeshElementParameter but "
                "the element id is not specified.");
        }
        auto const num_comp = _property.getNumberOfGlobalComponents();
        std::vector<T> cache(num_comp);
        for (int c = 0; c < num_comp; ++c)
        {
            cache[c] = _property.getComponent(*e, c);
        }
 
        if (!this->_coordinate_system)
        {
            return cache;
        }
 
        return this->rotateWithCoordinateSystem(cache, pos);
    }
 
    Eigen::Matrix<T, Eigen::Dynamic, Eigen::Dynamic> getNodalValuesOnElement(
        MeshLib::Element const& element, double const t) const override
    {
        auto const n_nodes = element.getNumberOfNodes();
        Eigen::Matrix<T, Eigen::Dynamic, Eigen::Dynamic> result(
            n_nodes, getNumberOfGlobalComponents());
 
        // Column vector of values, copied for each node.
        SpatialPosition x_position;
        x_position.setElementID(element.getID());
        auto const& values = this->operator()(t, x_position);
        auto const row_values =
            Eigen::Map<Eigen::Matrix<T, Eigen::Dynamic, 1> const>(
                values.data(), values.size());
        for (unsigned i = 0; i < n_nodes; ++i)
        {
            result.row(i) = row_values;
        }
        return result;
    }
 
private:
    MeshLib::PropertyVector<T> const& _property;
};
 
std::unique_ptr<ParameterBase> createRandomFieldMeshElementParameter(
    std::string const& name, BaseLib::ConfigTree const& config,
    MeshLib::Mesh& mesh);
 
}  // namespace ParameterLib