//----------------------------------------------------------------------------
bool Mgc::FindIntersection (const Line2& rkLine0, const Line2& rkLine1,
int& riQuantity, Real afT[2])
{
Vector2 kDiff;
Real fD0SqrLen;
bool bIntersects = Find(rkLine0.Origin(),rkLine0.Direction(),
rkLine1.Origin(),rkLine1.Direction(),kDiff,fD0SqrLen,riQuantity,afT);
if ( bIntersects )
{
if ( riQuantity == 2 )
{
afT[0] = -Math::MAX_REAL;
afT[1] = Math::MAX_REAL;
}
}
return riQuantity != 0;
}
//----------------------------------------------------------------------------
bool Mgc::FindIntersection (const Line2& rkLine, const Segment2& rkSegment,
int& riQuantity, Real afT[2])
{
Vector2 kDiff;
Real fD0SqrLen;
bool bIntersects = Find(rkLine.Origin(),rkLine.Direction(),
rkSegment.Origin(),rkSegment.Direction(),kDiff,fD0SqrLen,riQuantity,
afT);
if ( bIntersects )
{
if ( riQuantity == 1 )
{
if ( afT[1] < 0.0f || afT[1] > 1.0f )
{
// lines intersect, but segment does not intersect line
riQuantity = 0;
}
}
else
{
// segment is contained by line, adjust intersection interval
Real fDot = rkLine.Direction().Dot(rkSegment.Direction());
Real fInvLen = 1.0f/fD0SqrLen;
if ( fDot > 0.0f )
{
afT[0] = (kDiff.Dot(rkLine.Direction()))*fInvLen;
afT[1] = afT[0] + fDot*fInvLen;
}
else
{
afT[1] = (kDiff.Dot(rkLine.Direction()))*fInvLen;
afT[0] = afT[1] + fDot*fInvLen;
}
}
}
return riQuantity != 0;
}
//----------------------------------------------------------------------------
bool Mgc::FindIntersection (const Line2& rkLine, const Ray2& rkRay,
int& riQuantity, Real afT[2])
{
Vector2 kDiff;
Real fD0SqrLen;
bool bIntersects = Find(rkLine.Origin(),rkLine.Direction(),
rkRay.Origin(),rkRay.Direction(),kDiff,fD0SqrLen,riQuantity,afT);
if ( bIntersects )
{
if ( riQuantity == 1 )
{
if ( afT[1] < 0.0f )
{
// lines intersect, but ray does not intersect line
riQuantity = 0;
}
}
else
{
// ray is contained by line, adjust intersection interval
if ( rkLine.Direction().Dot(rkRay.Direction()) > 0.0f )
{
afT[0] = (kDiff.Dot(rkLine.Direction()))/fD0SqrLen;
afT[1] = Math::MAX_REAL;
}
else
{
afT[0] = -Math::MAX_REAL;
afT[1] = (kDiff.Dot(rkLine.Direction()))/fD0SqrLen;
}
}
}
return riQuantity != 0;
}
