/usr/include/libwildmagic/Wm5IntrLine2Triangle2.h is in libwildmagic-dev 5.13-1.
This file is owned by root:root, with mode 0o644.
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// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.1 (2010/10/01)
#ifndef WM5INTRLINE2TRIANGLE2_H
#define WM5INTRLINE2TRIANGLE2_H
#include "Wm5MathematicsLIB.h"
#include "Wm5Intersector.h"
#include "Wm5Line2.h"
#include "Wm5Triangle2.h"
namespace Wm5
{
template <typename Real>
class WM5_MATHEMATICS_ITEM IntrLine2Triangle2
: public Intersector<Real,Vector2<Real> >
{
public:
IntrLine2Triangle2 (const Line2<Real>& line,
const Triangle2<Real>& triangle);
// Object access.
const Line2<Real>& GetLine () const;
const Triangle2<Real>& GetTriangle () const;
// Static intersection query.
virtual bool Test ();
virtual bool Find ();
// The intersection set. If the line and triangle do not intersect,
// GetQuantity() returns 0, in which case the intersection type is
// IT_EMPTY. If the line and triangle intersect in a single point,
// GetQuantity() returns 1, in which case the intersection type is
// IT_POINT and GetPoint() returns the intersection point. If the line
// and triangle intersect in a segment, GetQuantity() returns 2, in which
// case the intersection type is IT_SEGMENT and GetPoint() returns the
// segment endpoints.
int GetQuantity () const;
const Vector2<Real>& GetPoint (int i) const;
private:
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> >::mIntersectionType;
// The objects to intersect.
const Line2<Real>* mLine;
const Triangle2<Real>* mTriangle;
// Information about the intersection set.
int mQuantity;
Vector2<Real> mPoint[2];
public_internal:
// Shared by IntrRay2Triangle2 and IntrSegment2Triangle2.
// Determine how the triangle and line intersect (if at all).
static void TriangleLineRelations (const Vector2<Real>& origin,
const Vector2<Real>& direction, const Triangle2<Real>& triangle,
Real dist[3], int sign[3], int& positive, int& negative,
int& zero);
// Compute the parameter interval for the segment of intersection when
// the triangle transversely intersects the line.
static void GetInterval (const Vector2<Real>& origin,
const Vector2<Real>& direction, const Triangle2<Real>& triangle,
const Real dist[3], const int sign[3], Real param[2]);
};
typedef IntrLine2Triangle2<float> IntrLine2Triangle2f;
typedef IntrLine2Triangle2<double> IntrLine2Triangle2d;
}
#endif
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