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// Geometric Tools, LLC
// 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)
#include "Wm5MathematicsPCH.h"
#include "Wm5IntrRay2Segment2.h"
#include "Wm5IntrLine2Line2.h"
#include "Wm5Intersector1.h"
namespace Wm5
{
//----------------------------------------------------------------------------
template <typename Real>
IntrRay2Segment2<Real>::IntrRay2Segment2 (const Ray2<Real>& ray,
const Segment2<Real>& segment)
:
mRay(&ray),
mSegment(&segment),
mIntervalThreshold((Real)0),
mDotThreshold(Math<Real>::ZERO_TOLERANCE)
{
}
//----------------------------------------------------------------------------
template <typename Real>
const Ray2<Real>& IntrRay2Segment2<Real>::GetRay () const
{
return *mRay;
}
//----------------------------------------------------------------------------
template <typename Real>
const Segment2<Real>& IntrRay2Segment2<Real>::GetSegment () const
{
return *mSegment;
}
//----------------------------------------------------------------------------
template <typename Real>
bool IntrRay2Segment2<Real>::Test ()
{
Real s[2];
mIntersectionType = IntrLine2Line2<Real>::Classify(mRay->Origin,
mRay->Direction, mSegment->Center, mSegment->Direction,
mDotThreshold, s);
if (mIntersectionType == IT_POINT)
{
// Test whether the line-line intersection is on the ray and on the
// segment.
if (s[0] >= (Real)0
&& Math<Real>::FAbs(s[1]) <= mSegment->Extent + mIntervalThreshold)
{
mQuantity = 1;
}
else
{
mQuantity = 0;
mIntersectionType = IT_EMPTY;
}
}
else if (mIntersectionType == IT_LINE)
{
// Compute the location of the segment center relative to the ray.
Real t1 = mRay->Direction.Dot(mSegment->Center - mRay->Origin);
// Compute the location of the right-most point of the segment
// relative to the ray direction.
Real tmax = t1 + mSegment->Extent;
if (tmax > (Real)0)
{
mQuantity = 2;
mIntersectionType = IT_SEGMENT;
}
else if (tmax < (Real)0)
{
mQuantity = 0;
mIntersectionType = IT_EMPTY;
}
else // tmax == 0
{
mQuantity = 1;
mIntersectionType = IT_POINT;
}
}
else
{
mQuantity = 0;
}
return mIntersectionType != IT_EMPTY;
}
//----------------------------------------------------------------------------
template <typename Real>
bool IntrRay2Segment2<Real>::Find ()
{
Real s[2];
mIntersectionType = IntrLine2Line2<Real>::Classify(mRay->Origin,
mRay->Direction, mSegment->Center, mSegment->Direction,
mDotThreshold, s);
if (mIntersectionType == IT_POINT)
{
// Test whether the line-line intersection is on the ray and on the
// segment.
if (s[0] >= (Real)0
&& Math<Real>::FAbs(s[1]) <= mSegment->Extent + mIntervalThreshold)
{
mQuantity = 1;
mPoint[0] = mRay->Origin + s[0]*mRay->Direction;
}
else
{
mQuantity = 0;
mIntersectionType = IT_EMPTY;
}
}
else if (mIntersectionType == IT_LINE)
{
// Compute the location of the segment center relative to the ray.
Real t1 = mRay->Direction.Dot(mSegment->Center - mRay->Origin);
// Compute the location of the segment endpoints relative to the
// ray direction.
Real tmin = t1 - mSegment->Extent;
Real tmax = t1 + mSegment->Extent;
// Compute the intersection of [0,+infinity) and [tmin,tmax].
Intersector1<Real> calc((Real)0, Math<Real>::MAX_REAL, tmin, tmax);
calc.Find();
mQuantity = calc.GetNumIntersections();
if (mQuantity == 2)
{
mIntersectionType = IT_SEGMENT;
mPoint[0] = mRay->Origin + calc.GetIntersection(0)*mRay->Direction;
mPoint[1] = mRay->Origin + calc.GetIntersection(1)*mRay->Direction;
}
else if (mQuantity == 1)
{
mIntersectionType = IT_POINT;
mPoint[0] = mRay->Origin;
}
else
{
mIntersectionType = IT_EMPTY;
}
}
else
{
mQuantity = 0;
}
return mIntersectionType != IT_EMPTY;
}
//----------------------------------------------------------------------------
template <typename Real>
void IntrRay2Segment2<Real>::SetIntervalThreshold (Real intervalThreshold)
{
if (intervalThreshold >= (Real)0)
{
mIntervalThreshold = intervalThreshold;
return;
}
assertion(false, "Interval threshold must be nonnegative.");
}
//----------------------------------------------------------------------------
template <typename Real>
Real IntrRay2Segment2<Real>::GetIntervalThreshold () const
{
return mIntervalThreshold;
}
//----------------------------------------------------------------------------
template <typename Real>
void IntrRay2Segment2<Real>::SetDotThreshold (Real dotThreshold)
{
if (dotThreshold >= (Real)0)
{
mDotThreshold = dotThreshold;
return;
}
assertion(false, "Dot threshold must be nonnegative.");
}
//----------------------------------------------------------------------------
template <typename Real>
Real IntrRay2Segment2<Real>::GetDotThreshold () const
{
return mDotThreshold;
}
//----------------------------------------------------------------------------
template <typename Real>
int IntrRay2Segment2<Real>::GetQuantity () const
{
return mQuantity;
}
//----------------------------------------------------------------------------
template <typename Real>
const Vector2<Real>& IntrRay2Segment2<Real>::GetPoint (int i) const
{
return mPoint[i];
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// Explicit instantiation.
//----------------------------------------------------------------------------
template WM5_MATHEMATICS_ITEM
class IntrRay2Segment2<float>;
template WM5_MATHEMATICS_ITEM
class IntrRay2Segment2<double>;
//----------------------------------------------------------------------------
}
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