PiecewiseLinearInterpolation.h

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// SPDX-FileCopyrightText: Copyright (c) OpenGeoSys Community (opengeosys.org)
// SPDX-License-Identifier: BSD-3-Clause
 
#pragma once
 
#include <vector>
 
namespace MathLib
{
class PiecewiseLinearInterpolation
{
public:
    PiecewiseLinearInterpolation(std::vector<double> supporting_points,
                                 std::vector<double> values_at_supp_pnts,
                                 bool supp_pnts_sorted = false);
 
    PiecewiseLinearInterpolation(std::vector<int> const& supporting_points,
                                 std::vector<double> const& values_at_supp_pnts,
                                 bool supp_pnts_sorted = false);

    double getValue(double pnt_to_interpolate) const;

    double getDerivative(double const pnt_to_interpolate) const;
    double getSupportMax() const;
    double getSupportMin() const;
 
protected:
    std::vector<double> supp_pnts_;
    std::vector<double> values_at_supp_pnts_;
};
}  // end namespace MathLib