Sphere2.h

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/*************************************************************************
> File Name: Sphere2.h
> Project Name: CubbyFlow
> Author: Chan-Ho Chris Ohk
> Purpose: 2-D sphere geometry.
> Created Time: 2017/04/04
> Copyright (c) 2018, Chan-Ho Chris Ohk
*************************************************************************/
#ifndef CUBBYFLOW_SPHERE2_H
#define CUBBYFLOW_SPHERE2_H

#include <Core/Surface/Surface2.h>

namespace CubbyFlow
{
    class Sphere2 final : public Surface2
    {
    public:
        class Builder;

        Vector2D center;

        double radius = 1.0;

        Sphere2(
            const Transform2& transform = Transform2(),
            bool isNormalFlipped = false);

        Sphere2(
            const Vector2D& center,
            double radius,
            const Transform2& transform = Transform2(),
            bool isNormalFlipped = false);

        Sphere2(const Sphere2& other);

        static Builder GetBuilder();

    private:
        Vector2D ClosestPointLocal(const Vector2D& otherPoint) const override;

        double ClosestDistanceLocal(const Vector2D& otherPoint) const override;

        bool IntersectsLocal(const Ray2D& ray) const override;

        BoundingBox2D BoundingBoxLocal() const override;

        Vector2D ClosestNormalLocal(const Vector2D& otherPoint) const override;

        SurfaceRayIntersection2 ClosestIntersectionLocal(const Ray2D& ray) const override;
    };

    using Sphere2Ptr = std::shared_ptr<Sphere2>;

    class Sphere2::Builder final : public SurfaceBuilderBase2<Sphere2::Builder>
    {
    public:
        Builder& WithCenter(const Vector2D& center);

        Builder& WithRadius(double radius);

        Sphere2 Build() const;

        Sphere2Ptr MakeShared() const;

    private:
        Vector2D m_center = { 0, 0 };
        double m_radius = 0.0;
    };
}

#endif