// Wild Magic Source Code
// David Eberly
// http://www.geometrictools.com
// Copyright (c) 1998-2008
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2.1 of the License, or (at
// your option) any later version.  The license is available for reading at
// either of the locations:
//     http://www.gnu.org/copyleft/lgpl.html
//     http://www.geometrictools.com/License/WildMagicLicense.pdf
//
// Version: 4.0.1 (2007/05/06)

#ifndef WM4INTRLINCOMP2TRIANGLE2_H
#define WM4INTRLINCOMP2TRIANGLE2_H

#include "Wm4FoundationLIB.h"
#include "Wm4Intersector.h"
#include "Wm4LinComp2.h"
#include "Wm4Triangle2.h"

namespace Wm4
{

template <class Real>
class WM4_FOUNDATION_ITEM IntrLinComp2Triangle2
    : public Intersector<Real,Vector2<Real> >
{
public:
    IntrLinComp2Triangle2 (const LinComp2<Real>& rkComponent,
        const Triangle2<Real>& rkTriangle);

    // object access
    const LinComp2<Real>& GetComponent () const;
    const Triangle2<Real>& GetTriangle () const;

    // static intersection queries
    virtual bool Test ();
    virtual bool Find ();

    // Information about the intersection set.  GetIntersectionType() returns
    // IT_EMPTY, IT_POINT, or IT_SEGMENT.
    const LinComp2<Real>& GetIntersectionComponent() const;

protected:
    using Intersector<Real,Vector2<Real> >::IT_EMPTY;
    using Intersector<Real,Vector2<Real> >::IT_POINT;
    using Intersector<Real,Vector2<Real> >::IT_SEGMENT;
    using Intersector<Real,Vector2<Real> >::m_iIntersectionType;

    // Determine how the triangle and line intersect (if at all).
    void TriangleLineRelations (Real afDist[3], int aiSign[3],
        int& riPositive, int& riNegative, int& riZero);

    // Compute the parameter interval for the segment of intersection when
    // the triangle transversely intersects the line.
    void GetInterval (const Real afDist[3], const int aiSign[3],
        Real afParam[2]);

    // the objects to intersect
    const LinComp2<Real>* m_pkComponent;
    const Triangle2<Real>* m_pkTriangle;

    // information about the intersection set
    LinComp2<Real> m_kIntrComponent;
};

typedef IntrLinComp2Triangle2<float> IntrLinComp2Triangle2f;
typedef IntrLinComp2Triangle2<double> IntrLinComp2Triangle2d;

}

#endif
