Box2.h

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/*************************************************************************
> File Name: Box2.h
> Project Name: CubbyFlow
> Author: Chan-Ho Chris Ohk
> Purpose: 2-D box geometry.
> Created Time: 2017/06/21
> Copyright (c) 2018, Chan-Ho Chris Ohk
*************************************************************************/
#ifndef CUBBYFLOW_BOX2_H
#define CUBBYFLOW_BOX2_H

#include <Core/Surface/Surface2.h>

namespace CubbyFlow
{
    class Box2 final : public Surface2
    {
    public:
        class Builder;

        BoundingBox2D bound = BoundingBox2D(Vector2D(), Vector2D(1.0, 1.0));

        Box2(const Transform2& transform = Transform2(), bool isNormalFlipped = false);

        Box2(const Vector2D& lowerCorner, const Vector2D& upperCorner,
            const Transform2& transform = Transform2(), bool isNormalFlipped = false);

        Box2(const BoundingBox2D& boundingBox, const Transform2& transform = Transform2(), bool isNormalFlipped = false);

        Box2(const Box2& other);

        static Builder GetBuilder();

    protected:
        // Surface2 implementations
        Vector2D ClosestPointLocal(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 Box2Ptr = std::shared_ptr<Box2>;
    
    class Box2::Builder final : public SurfaceBuilderBase2<Box2::Builder>
    {
    public:
        Builder& WithLowerCorner(const Vector2D& pt);

        Builder& WithUpperCorner(const Vector2D& pt);

        Builder& WithBoundingBox(const BoundingBox2D& bbox);

        Box2 Build() const;

        Box2Ptr MakeShared() const;

    private:
        Vector2D m_lowerCorner{ 0, 0 };
        Vector2D m_upperCorner{ 1, 1 };
    };
}

#endif