/usr/include/libwildmagic/Wm5IntrRay2Segment2.h is in libwildmagic-dev 5.13-1ubuntu1.
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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: 5.0.2 (2013/11/12)
#ifndef WM5INTRRAY2SEGMENT2_H
#define WM5INTRRAY2SEGMENT2_H
#include "Wm5MathematicsLIB.h"
#include "Wm5Intersector.h"
#include "Wm5Ray2.h"
#include "Wm5Segment2.h"
namespace Wm5
{
template <typename Real>
class WM5_MATHEMATICS_ITEM IntrRay2Segment2
: public Intersector<Real,Vector2<Real> >
{
public:
IntrRay2Segment2 (const Ray2<Real>& ray, const Segment2<Real>& segment);
// Object access.
const Ray2<Real>& GetRay () const;
const Segment2<Real>& GetSegment () const;
// Static intersection query.
virtual bool Test ();
virtual bool Find ();
// The intersection testing uses the center-extent form for line segments.
// If you start with endpoints (Vector2<Real>) and create Segment2<Real>
// objects, the conversion to center-extent form can contain small
// numerical round-off errors. Testing for the intersection of two
// segments that share an endpoint might lead to a failure due to the
// round-off errors. To allow for this, you may specify a small positive
// threshold that slightly enlarges the intervals for the segments. The
// default value is zero.
void SetIntervalThreshold (Real intervalThreshold);
Real GetIntervalThreshold () const;
// The computation for determining whether the linear components are
// parallel might contain small floating-point round-off errors. The
// default threshold is Math<Real>::ZERO_TOLERANCE. If you set the value,
// pass in a nonnegative number.
void SetDotThreshold (Real dotThreshold);
Real GetDotThreshold () const;
// The intersection set. Let q = GetQuantity(). The cases are
//
// q = 0: The ray/segment do not intersect. GetIntersection() returns
// IT_EMPTY.
//
// q = 1: The ray/segment intersect in a single point. GetIntersection()
// returns IT_POINT. For Find() queries, access the intersection
// point using GetPoint(0).
//
// q = 2: The ray/segment are collinear and intersect in a segment.
// GetIntersection() returns IT_SEGMENT. For Find() queries,
// access the endpoints of the intersection segment using
// GetPoint(0) and GetPoint(1).
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> >::IT_LINE;
using Intersector<Real,Vector2<Real> >::mIntersectionType;
// The objects to intersect.
const Ray2<Real>* mRay;
const Segment2<Real>* mSegment;
// See the comments before {Set,Get}IntervalThreshold.
Real mIntervalThreshold;
// See the comments before {Set,Get}DotThreshold.
Real mDotThreshold;
// Information about the intersection set.
int mQuantity;
Vector2<Real> mPoint[2];
};
typedef IntrRay2Segment2<float> IntrRay2Segment2f;
typedef IntrRay2Segment2<double> IntrRay2Segment2d;
}
#endif
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