BoundingBox2.h

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/*************************************************************************
> File Name: BoundingBox2.h
> Project Name: CubbyFlow
> Author: Chan-Ho Chris Ohk
> Purpose: 2-D axis-aligned bounding box class.
> Created Time: 2017/03/29
> Copyright (c) 2018, Chan-Ho Chris Ohk
*************************************************************************/
#ifndef CUBBYFLOW_BOUNDING_BOX2_H
#define CUBBYFLOW_BOUNDING_BOX2_H

#include <Core/BoundingBox/BoundingBox.h>
#include <Core/Ray/Ray2.h>
#include <Core/Vector/Vector2.h>

#include <limits>

namespace CubbyFlow
{
    template <typename T>
    struct BoundingBoxRayIntersection2
    {
        bool isIntersecting = false;

        T near = std::numeric_limits<T>::max();

        T far = std::numeric_limits<T>::max();
    };

    template <typename T>
    class BoundingBox<T, 2>
    {
    public:
        Vector2<T> lowerCorner;

        Vector2<T> upperCorner;

        BoundingBox();

        BoundingBox(const Vector2<T>& point1, const Vector2<T>& point2);

        BoundingBox(const BoundingBox& other);

        T GetWidth() const;

        T GetHeight() const;

        T Length(size_t axis);

        bool Overlaps(const BoundingBox& other) const;

        bool Contains(const Vector2<T>& point) const;

        bool Intersects(const Ray2<T>& ray) const;

        BoundingBoxRayIntersection2<T> ClosestIntersection(const Ray2<T>& ray) const;

        Vector2<T> MidPoint() const;

        T DiagonalLength() const;

        T DiagonalLengthSquared() const;

        void Reset();

        void Merge(const Vector2<T>& point);

        void Merge(const BoundingBox& other);

        void Expand(T delta);

        Vector2<T> Corner(size_t idx) const;

        Vector2<T> Clamp(const Vector2<T>& pt) const;

        bool IsEmpty() const;
    };

    template <typename T> using BoundingBox2 = BoundingBox<T, 2>;

    using BoundingBox2F = BoundingBox2<float>;

    using BoundingBox2D = BoundingBox2<double>;

    using BoundingBoxRayIntersection2F = BoundingBoxRayIntersection2<float>;

    using BoundingBoxRayIntersection2D = BoundingBoxRayIntersection2<double>;
}

#include <Core/BoundingBox/BoundingBox2-Impl.h>

#endif