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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 "Wm5IntrRay2Arc2.h"
#include "Wm5IntrLine2Circle2.h"
namespace Wm5
{
//----------------------------------------------------------------------------
template <typename Real>
IntrRay2Arc2<Real>::IntrRay2Arc2 (const Ray2<Real>& ray,
const Arc2<Real>& arc)
:
mRay(&ray),
mArc(&arc)
{
}
//----------------------------------------------------------------------------
template <typename Real>
const Ray2<Real>& IntrRay2Arc2<Real>::GetRay () const
{
return *mRay;
}
//----------------------------------------------------------------------------
template <typename Real>
const Arc2<Real>& IntrRay2Arc2<Real>::GetArc () const
{
return *mArc;
}
//----------------------------------------------------------------------------
template <typename Real>
bool IntrRay2Arc2<Real>::Find ()
{
Real t[2];
int quantity;
bool intersects = IntrLine2Circle2<Real>::Find(mRay->Origin,
mRay->Direction, mArc->Center, mArc->Radius, quantity, t);
mQuantity = 0;
if (intersects)
{
// Reduce root count if line-circle intersections are not on ray.
if (quantity == 1)
{
if (t[0] < (Real)0)
{
quantity = 0;
}
}
else
{
if (t[1] < (Real)0)
{
quantity = 0;
}
else if (t[0] < (Real)0)
{
quantity = 1;
t[0] = t[1];
}
}
for (int i = 0; i < quantity; ++i)
{
Vector2<Real> point = mRay->Origin + mRay->Direction*t[i];
if (mArc->Contains(point))
{
mPoint[mQuantity++] = point;
}
}
}
mIntersectionType = (mQuantity > 0 ? IT_POINT : IT_EMPTY);
return mIntersectionType != IT_EMPTY;
}
//----------------------------------------------------------------------------
template <typename Real>
int IntrRay2Arc2<Real>::GetQuantity () const
{
return mQuantity;
}
//----------------------------------------------------------------------------
template <typename Real>
const Vector2<Real>& IntrRay2Arc2<Real>::GetPoint (int i) const
{
return mPoint[i];
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// Explicit instantiation.
//----------------------------------------------------------------------------
template WM5_MATHEMATICS_ITEM
class IntrRay2Arc2<float>;
template WM5_MATHEMATICS_ITEM
class IntrRay2Arc2<double>;
//----------------------------------------------------------------------------
}
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