ConstantVectorField2.h

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/*************************************************************************
> File Name: ConstantVectorField2.h
> Project Name: CubbyFlow
> Author: Chan-Ho Chris Ohk
> Purpose: 2-D constant vector field.
> Created Time: 2017/04/01
> Copyright (c) 2018, Chan-Ho Chris Ohk
*************************************************************************/
#ifndef CUBBYFLOW_CONSTANT_VECTOR_FIELD2_H
#define CUBBYFLOW_CONSTANT_VECTOR_FIELD2_H

#include <Core/Field/VectorField2.h>

namespace CubbyFlow
{
    class ConstantVectorField2 final : public VectorField2
    {
    public:
        class Builder;

        explicit ConstantVectorField2(const Vector2D& value);

        Vector2D Sample(const Vector2D& x) const override;

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

        static Builder GetBuilder();

    private:
        Vector2D m_value;
    };

    using ConstantVectorField2Ptr = std::shared_ptr<ConstantVectorField2>;


    class ConstantVectorField2::Builder final
    {
    public:
        Builder& WithValue(const Vector2D& value);

        ConstantVectorField2 Build() const;

        ConstantVectorField2Ptr MakeShared() const;

    private:
        Vector2D m_value{ 0, 0 };
    };
}

#endif