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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: 5.0.1 (2010/10/01)
#include "Wm5MathematicsPCH.h"
#include "Wm5IntrSegment2Triangle2.h"
#include "Wm5Intersector1.h"
#include "Wm5IntrLine2Triangle2.h"
namespace Wm5
{
//----------------------------------------------------------------------------
template <typename Real>
IntrSegment2Triangle2<Real>::IntrSegment2Triangle2 (
const Segment2<Real>& segment, const Triangle2<Real>& triangle)
:
mSegment(&segment),
mTriangle(&triangle)
{
}
//----------------------------------------------------------------------------
template <typename Real>
const Segment2<Real>& IntrSegment2Triangle2<Real>::GetSegment () const
{
return *mSegment;
}
//----------------------------------------------------------------------------
template <typename Real>
const Triangle2<Real>& IntrSegment2Triangle2<Real>::GetTriangle () const
{
return *mTriangle;
}
//----------------------------------------------------------------------------
template <typename Real>
bool IntrSegment2Triangle2<Real>::Test ()
{
Real dist[3];
int sign[3], positive, negative, zero;
IntrLine2Triangle2<Real>::TriangleLineRelations(mSegment->Center,
mSegment->Direction, *mTriangle, dist, sign, positive, negative,
zero);
if (positive == 3 || negative == 3)
{
mIntersectionType = IT_EMPTY;
}
else
{
Real param[2];
IntrLine2Triangle2<Real>::GetInterval(mSegment->Center,
mSegment->Direction, *mTriangle, dist, sign, param);
Intersector1<Real> intr(param[0], param[1],
-mSegment->Extent, +mSegment->Extent);
intr.Find();
mQuantity = intr.GetNumIntersections();
if (mQuantity == 2)
{
mIntersectionType = IT_SEGMENT;
}
else if (mQuantity == 1)
{
mIntersectionType = IT_POINT;
}
else
{
mIntersectionType = IT_EMPTY;
}
}
return mIntersectionType != IT_EMPTY;
}
//----------------------------------------------------------------------------
template <typename Real>
bool IntrSegment2Triangle2<Real>::Find ()
{
Real dist[3];
int sign[3], positive, negative, zero;
IntrLine2Triangle2<Real>::TriangleLineRelations(mSegment->Center,
mSegment->Direction, *mTriangle, dist, sign, positive, negative,
zero);
if (positive == 3 || negative == 3)
{
// No intersections.
mQuantity = 0;
mIntersectionType = IT_EMPTY;
}
else
{
Real param[2];
IntrLine2Triangle2<Real>::GetInterval(mSegment->Center,
mSegment->Direction, *mTriangle, dist, sign, param);
Intersector1<Real> intr(param[0], param[1],
-mSegment->Extent, +mSegment->Extent);
intr.Find();
mQuantity = intr.GetNumIntersections();
if (mQuantity == 2)
{
// Segment intersection.
mIntersectionType = IT_SEGMENT;
mPoint[0] = mSegment->Center +
intr.GetIntersection(0)*mSegment->Direction;
mPoint[1] = mSegment->Center +
intr.GetIntersection(1)*mSegment->Direction;
}
else if (mQuantity == 1)
{
// Point intersection.
mIntersectionType = IT_POINT;
mPoint[0] = mSegment->Center +
intr.GetIntersection(0)*mSegment->Direction;
}
else
{
// No intersections.
mIntersectionType = IT_EMPTY;
}
}
return mIntersectionType != IT_EMPTY;
}
//----------------------------------------------------------------------------
template <typename Real>
int IntrSegment2Triangle2<Real>::GetQuantity () const
{
return mQuantity;
}
//----------------------------------------------------------------------------
template <typename Real>
const Vector2<Real>& IntrSegment2Triangle2<Real>::GetPoint (int i) const
{
return mPoint[i];
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// Explicit instantiation.
//----------------------------------------------------------------------------
template WM5_MATHEMATICS_ITEM
class IntrSegment2Triangle2<float>;
template WM5_MATHEMATICS_ITEM
class IntrSegment2Triangle2<double>;
//----------------------------------------------------------------------------
}
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