/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2014 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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-----------------------------------------------------------------------------
OgreSegment.h  -  3D Line Segment class for intersection testing in Ogre3D
Some algorithms based off code from the Wild Magic library by Dave Eberly
-----------------------------------------------------------------------------
begin                : Mon Apr 02 2007
author               : Eric Cha
email                : ericc@xenopi.com
Code Style Update    : Apr 5, 2007
-----------------------------------------------------------------------------
*/

#ifndef SEGMENT_H
#define SEGMENT_H

#include "OgreVector3.h"

namespace Ogre
{
    class Capsule;

    class Segment
    {
    public:
        // The segment is represented as P+t*D, where P is the segment origin,
        // D is a unit-length direction vector and |t| <= e.  The value e is
        // referred to as the extent of the segment.  The end points of the
        // segment are P-e*D and P+e*D.  The user must ensure that the direction
        // vector is unit-length.  The representation for a segment is analogous
        // to that for an oriented bounding box.  P is the center, D is the
        // axis direction, and e is the extent.


        // construction
        Segment ();  // uninitialized
        Segment (const Vector3&, const Vector3&, Real);

        // set values
        void set(const Vector3& newOrigin, const Vector3& newEnd);
        void setOrigin(const Vector3& newOrigin);
        void setEndPoint(const Vector3& newEndpoint);

        // functions to calculate distance to another segment
        Real distance(const Segment& otherSegment) const;
        Real squaredDistance(const Segment& otherSegment) const;

        // intersect check between segment & capsule 
        bool intersects(const Capsule&) const;

        // defining variables
        Vector3 mOrigin;
        Vector3 mDirection;
        Real    mExtent;
    };
}

#endif //SEGMENT_H
