CustomVectorField2.h

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/*************************************************************************
> File Name: CustomVectorField2.h
> Project Name: CubbyFlow
> Author: Chan-Ho Chris Ohk
> Purpose: 2-D vector field with custom field function.
> Created Time: 2017/03/15
> Copyright (c) 2018, Chan-Ho Chris Ohk
*************************************************************************/
#ifndef CUBBYFLOW_CUSTOM_VECTOR_FIELD2_H
#define CUBBYFLOW_CUSTOM_VECTOR_FIELD2_H

#include <Core/Field/VectorField2.h>

namespace CubbyFlow
{
    class CustomVectorField2 final : public VectorField2
    {
    public:
        class Builder;

        CustomVectorField2(
            const std::function<Vector2D(const Vector2D&)>& customFunction,
            double derivativeResolution = 1e-3);

        CustomVectorField2(
            const std::function<Vector2D(const Vector2D&)>& customFunction,
            const std::function<double(const Vector2D&)>& customDivergenceFunction,
            double derivativeResolution = 1e-3);

        CustomVectorField2(
            const std::function<Vector2D(const Vector2D&)>& customFunction,
            const std::function<double(const Vector2D&)>& customDivergenceFunction,
            const std::function<double(const Vector2D&)>& customCurlFunction);

        Vector2D Sample(const Vector2D& x) const override;

        double Divergence(const Vector2D& x) const override;

        double Curl(const Vector2D& x) const override;

        std::function<Vector2D(const Vector2D&)> Sampler() const override;

        static Builder GetBuilder();

    private:
        std::function<Vector2D(const Vector2D&)> m_customFunction;
        std::function<double(const Vector2D&)> m_customDivergenceFunction;
        std::function<double(const Vector2D&)> m_customCurlFunction;
        double m_resolution = 1e-3;
    };

    using CustomVectorField2Ptr = std::shared_ptr<CustomVectorField2>;

    class CustomVectorField2::Builder final
    {
    public:
        Builder& WithFunction(const std::function<Vector2D(const Vector2D&)>& func);

        Builder& WithDivergenceFunction(const std::function<double(const Vector2D&)>& func);

        Builder& WithCurlFunction(const std::function<double(const Vector2D&)>& func);

        Builder& WithDerivativeResolution(double resolution);

        CustomVectorField2 Build() const;

        CustomVectorField2Ptr MakeShared() const;

    private:
        double m_resolution = 1e-3;
        std::function<Vector2D(const Vector2D&)> m_customFunction;
        std::function<double(const Vector2D&)> m_customDivergenceFunction;
        std::function<double(const Vector2D&)> m_customCurlFunction;
    };
}

#endif