UniformGridRandomFieldGenerator.hpp

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*/
 
#ifndef UNIFORM_GRID_RANDOM_FIELD_GENERATOR_HPP_
#define UNIFORM_GRID_RANDOM_FIELD_GENERATOR_HPP_
 
#include <array>
#include <vector>
 
#include "ChasteSerialization.hpp"
#include "UblasVectorInclude.hpp"
 
#include "OpenSimplex2S.hpp"
 
template<unsigned SPACE_DIM>
class UniformGridRandomFieldGenerator
{
private:
 
    friend class boost::serialization::access;
    friend class TestSamplesFromCachedRandomField;
    friend class TestUniformGridRandomFieldGenerator;
 
    std::array<double, SPACE_DIM> mLowerCorner;
 
    std::array<double, SPACE_DIM> mUpperCorner;
 
    std::array<unsigned, SPACE_DIM> mNumGridPts;
 
    std::array<bool, SPACE_DIM> mPeriodicity;
 
    double mLengthScale;
 
    unsigned mNumTotalGridPts;
 
    std::array<double, SPACE_DIM> mGridSpacing;
 
    std::array<double, SPACE_DIM> mOneOverGridSpacing;
 
    const std::string mCacheDir;
 
    unsigned mNumEigenvals;
 
    template<class Archive>
    void serialize(Archive & archive, const unsigned int version)
    {
        archive & mLowerCorner;
        archive & mUpperCorner;
        archive & mNumGridPts;
        archive & mPeriodicity;
        archive & mLengthScale;
    }
 
    long GetLinearIndex(std::array<long, SPACE_DIM> gridIndex) const;
 
    std::array<double, SPACE_DIM> GetPositionUsingGridIndex(std::array<long, SPACE_DIM> gridIndex) const;
 
    OpenSimplex2S mOpenSimplex;
 
public:
 
    UniformGridRandomFieldGenerator(std::array<double, SPACE_DIM> lowerCorner,
                                    std::array<double, SPACE_DIM> upperCorner,
                                    std::array<unsigned, SPACE_DIM> numGridPts,
                                    std::array<bool, SPACE_DIM> periodicity,
                                    double lengthScale);
 
    std::vector<double> SampleRandomField();
 
    std::vector<double> SampleRandomFieldAtTime(double time);
 
    double Interpolate(const std::vector<double>& rRandomField,
                       const c_vector<double, SPACE_DIM>& rLocation) const;
 
    void SetRandomSeed(const unsigned seed);
};
 
#endif /*UNIFORM_GRID_RANDOM_FIELD_GENERATOR_HPP_*/