sphere.h

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// © Copyright 2010 - 2014 BlackTopp Studios Inc.
/* This file is part of The Mezzanine Engine.

    The Mezzanine Engine is free software: you can redistribute it and/or modify
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*/
/* The original authors have included a copy of the license specified above in the
   'Docs' folder. See 'gpl.txt'
*/
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*/
#ifndef _sphere_h
#define _sphere_h

/// @file
/// @brief This file contains a generic Sphere class for math and spacial query.

#include "vector3.h"

namespace Ogre
{
    class Sphere;
}

namespace Mezzanine
{
    class AxisAlignedBox;
    class Plane;
    class Ray;
    ///////////////////////////////////////////////////////////////////////////////
    /// @brief This is a generic sphere class used for spacial queries.
    /// @details
    ///////////////////////////////////////
    class MEZZ_LIB Sphere
    {
    public:
        /// @brief This is a type used for the return of a ray intersection test.
        /// @details This type provides more verbose return data that can be used for further tests.  @n @n
        /// The first member stores whether or not there was a hit.  The second member stores ray containing the points where the ray entered and exited the sphere.
        typedef std::pair<Boolean,Ray> RayTestResult;

        ///////////////////////////////////////////////////////////////////////////////
        // Public Data Members

        /// @brief The point in world space that is the center of the sphere.
        Vector3 Center;
        /// @brief The radius of the sphere.
        Real Radius;

        ///////////////////////////////////////////////////////////////////////////////
        // Construction and Destruction

        /// @brief Blank constructor.
        Sphere();
        /// @brief Copy constructor.
        /// @param Other The other sphere to copy from.
        Sphere(const Sphere& Other);
        /// @brief Radius constructor.
        /// @param SphereRadius The radius of the sphere.
        Sphere(const Real SphereRadius);
        /// @brief Descriptive constructor.
        /// @param SphereCenter The point in world space that is the center of the sphere.
        /// @param SphereRadius The radius of the sphere.
        Sphere(const Vector3& SphereCenter, const Real SphereRadius);
        /// @brief Internal constructor.
        /// @param InternalSphere The internal Ogre Sphere to construct this Sphere from.
        explicit Sphere(const Ogre::Sphere& InternalSphere);
        /// @brief Class destructor.
        ~Sphere();

        ///////////////////////////////////////////////////////////////////////////////
        // Utility

        /// @brief Checks to see if a point is inside this sphere.
        /// @param ToCheck The location to check to see if it is within this sphere.
        /// @return Returns true if the point provided is within this sphere, false otherwise.
        Boolean IsInside(const Vector3& ToCheck) const;
        /// @brief Checks to see if another sphere overlaps with this one.
        /// @param ToCheck The other sphere to check for overlap.
        /// @return Returns true if the provided sphere overlaps with this sphere, false otherwise.
        Boolean IsOverlapping(const Sphere& ToCheck) const;
        /// @brief Checks to see if an AABB overlaps with this sphere.
        /// @param ToCheck The AABB to check for overlap.
        /// @return Returns true if the AABB overlaps with this sphere, false otherwise.
        Boolean IsOverlapping(const AxisAlignedBox& ToCheck) const;
        /// @brief Checks to see if a plane intersects this sphere.
        /// @param ToCheck The plane to check for intersection.
        /// @return Returns true if the provided plane intersects with this sphere, false otherwise.
        Boolean IsOverlapping(const Plane& ToCheck) const;
        /// @brief Checks to see if a ray intersects this sphere.
        /// @param ToCheck The ray to check for a hit.
        /// @return Returns a std::pair containing whether or not the ray hit, and if it did the subsection of the ray that went through the sphere.
        RayTestResult Intersects(const Ray& ToCheck) const;

        ///////////////////////////////////////////////////////////////////////////////
        // Conversion Methods

        /// @brief Changes this Sphere to match the Ogre Sphere.
        /// @param InternalSphere The Ogre::Sphere to copy.
        void ExtractOgreSphere(const Ogre::Sphere& InternalSphere);
        /// @brief Gets an Ogre::Sphere that contains this Spheres information.
        /// @return This returns an Ogre::Sphere that contains the same information as this Spheres information.
        Ogre::Sphere GetOgreSphere() const;

        ///////////////////////////////////////////////////////////////////////////////
        // Serialization

        /// @brief Convert this class to an XML::Node ready for serialization.
        /// @param ParentNode The point in the XML hierarchy that all this renderable should be appended to.
        void ProtoSerialize(XML::Node& ParentNode) const;
        /// @brief Take the data stored in an XML Node and overwrite this object with it.
        /// @param SelfRoot An XML::Node containing the data to populate this class with.
        void ProtoDeSerialize(const XML::Node& SelfRoot);

        /// @brief Get the name of the the XML tag the proxy class will leave behind as its instances are serialized.
        /// @return A string containing the name of this class.
        static String GetSerializableName();

        ///////////////////////////////////////////////////////////////////////////////
        // Operators

        /// @brief Assignment operator.
        /// @param Other The other Sphere to copy from.
        void operator=(const Sphere& Other);

        /// @brief The assignment operator from Ogre::Sphere to Mezzanine::Sphere.
        /// @param InternalSphere The Ogre::Sphere to take data from.
        void operator=(const Ogre::Sphere& InternalSphere);

        /// @brief Greater-than operator.
        /// @note This operator compares the radii of both spheres.
        /// @param Other The other Sphere to compare with.
        /// @return Returns true if this Sphere is larger than the other provided Sphere, false otherwise.
        Boolean operator>(const Sphere& Other) const;
        /// @brief Greater-than or equals-to operator.
        /// @note This operator compares the radii of both spheres.
        /// @param Other The other Sphere to compare with.
        /// @return Returns true if this Sphere is larger than or equal to the other provided Sphere, false otherwise.
        Boolean operator<(const Sphere& Other) const;
        /// @brief Less-than operator.
        /// @note This operator compares the radii of both spheres.
        /// @param Other The other Sphere to compare with.
        /// @return Returns true if this Sphere is smaller than the other provided Sphere, false otherwise.
        Boolean operator>=(const Sphere& Other) const;
        /// @brief Less-than or equals-to operator.
        /// @note This operator compares the radii of both spheres.
        /// @param Other The other Sphere to compare with.
        /// @return Returns true if this Sphere is smaller than or equal to the other provided Sphere, false otherwise.
        Boolean operator<=(const Sphere& Other) const;

        /// @brief Equality operator.
        /// @param Other The other Sphere to compare with.
        /// @return Returns true if this Sphere is the same as the other provided Sphere, false otherwise.
        Boolean operator==(const Sphere& Other) const;
        /// @brief Inequality operator.
        /// @param Other The other Sphere to compare with.
        /// @return Returns true if this Sphere is not the same as the other provided Sphere, false otherwise.
        Boolean operator!=(const Sphere& Other) const;
    };//Sphere
}//Mezzanine

#endif