SPHStdKernel2.h

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/*************************************************************************
> File Name: SPHStdKernel2.h
> Project Name: CubbyFlow
> Author: Chan-Ho Chris Ohk
> Purpose: Standard 2-D SPH kernel function object.
> Created Time: 2017/05/30
> Copyright (c) 2018, Chan-Ho Chris Ohk
*************************************************************************/

// Adopted from the sample code of:
// Bart Adams and Martin Wicke,
// "Meshless Approximation Methods and Applications in Physics Based Modeling
// and Animation", Eurographics 2009 Tutorial

#ifndef CUBBYFLOW_SPH_STD_KERNEL2_H
#define CUBBYFLOW_SPH_STD_KERNEL2_H

#include <Core/Vector/Vector2.h>

namespace CubbyFlow
{
    struct SPHStdKernel2
    {
        double h;

        double h2;

        double h3;

        double h4;

        SPHStdKernel2();

        explicit SPHStdKernel2(double kernelRadius);

        SPHStdKernel2(const SPHStdKernel2& other);

        double operator()(double distance) const;

        double FirstDerivative(double distance) const;

        Vector2D Gradient(const Vector2D& point) const;

        Vector2D Gradient(double distance, const Vector2D& direction) const;

        double SecondDerivative(double distance) const;
    };

    struct SPHSpikyKernel2
    {
        double h;

        double h2;

        double h3;

        double h4;

        double h5;

        SPHSpikyKernel2();

        explicit SPHSpikyKernel2(double kernelRadius);

        SPHSpikyKernel2(const SPHSpikyKernel2& other);

        double operator()(double distance) const;

        double FirstDerivative(double distance) const;

        Vector2D Gradient(const Vector2D& point) const;

        Vector2D Gradient(double distance, const Vector2D& direction) const;

        double SecondDerivative(double distance) const;
    };
}

#endif