Public Member Functions
	DtRailSplineCalculator ()
virtual	~DtRailSplineCalculator ()
virtual bool	setUpTurnSpline (const DtRailSegment currentSeg, const DtRailSegment nextSeg, const int currentLane, const int desiredLane, Coordinate_System *coordinateSystem, bool useDefinedEntry=false, DtVector entryPt=DtVector::zero())
	Set up spline to achieve turning from one segment to another. Returns true if able to construct a spline.
virtual bool	setUpLaneSwitchSpline (const DtVector &projectedLocation, const DtRailSegment currentSeg, const double bvolHL, const int currentLane, const int desiredLane, Coordinate_System coordinateSystem)
	Set up spline to achieve a lane switch.
virtual bool	recalculateSpline (const DtRailSegment currentSeg, const DtRailSegment nextSeg, const int currentLane, const int passingLane, const int previousSwitchDirection, Coordinate_System *coordinateSystem)
virtual bool	modifySpline (const DtVector &currentLocalPos, const DtRailSegment currentSeg, const DtRailSegment nextSeg, const int currentLane, const int passingLane, Coordinate_System *coordinateSystem)
virtual void	calculateTurnPath (const DtVector &pathEntryPt, const DtVector &pathMidPt, const DtVector &pathExitPt)
	generates the turn path needed to provide a smooth turn that connects the segments on the path.
virtual DtVector	determinePositionAlongCurve (double distance)
	If the entity is using turn smoothing and it is currently turning this will find where on the curve the entity is.
virtual double	calculateTurnHeading (double oldHeading)
	Starting from the old heading add the percentage of the difference covered given the spline time.
virtual double	calculateLaneSwitchHeading (double oldHeading)
virtual bool	finishTurn (double oldHeading, double newHeading)
virtual bool	finishLaneSwitch (double oldHeading, double newHeading)
virtual const DtVector &	splineLocalEntryPoint () const
	These are the generated local entry,mid, exit points for the spline transformed from the pathEntryPt,pathMidPt, pathExitPt supplied to the calculateTurnPath function.
virtual const DtVector &	splineLocalMidPoint () const
virtual const DtVector &	splineLocalExitPoint () const
virtual const int	turnEntryLane () const
virtual void	setDrivingOnLeft (bool left)
virtual bool	drivingOnLeft () const
virtual void	setTurnDirection (const int dir)
	These are set by the updater when setUpTurn is called to intialize the spline calculator.
virtual const int	turnDirection () const
virtual void	setLocalToTopoTransform (const DtCoordTransform &transform)
virtual void	setTopoToLocalTransform (const DtCoordTransform &transform)
virtual void	clear ()
Protected Attributes
double	myTotalSplineDistance
	This is the distance along the current segment from turn entry point to end point plus the the distance along the next segment to the turn exit point.
double	mySplineTime
	Keeps track of the parametric time, where we are on the curve.
double	myHeadingShift
	This is the difference between our current heading and desired heading.
DtCoordTransform	myLocalToTopoTransform
	Transform to.
DtCoordTransform	myTopoToLocalTransform
int	myTurnDirection
	Direction of the curve--going to left(-1) or right(1)
int	myTurnEntryLane
	Lane we use to entry the turn.
bool	myDrivingOnLeft
	Are we driving on the left or right side of the road.
DtVector	myLocalEntryPoint
	The points used to generate the spline in local coordinates.
DtVector	myLocalMidPoint
DtVector	myLocalExitPoint
std::vector< DtVector >	mySplineCoefficents
	The spline coefficents used to determine a position along a curve.
Private Member Functions
	DtRailSplineCalculator (const DtRailSplineCalculator &orig)
	copy constructor
DtRailSplineCalculator &	operator= (const DtRailSplineCalculator &orig)
	assignment operator

Constructor & Destructor Documentation

DtRailSplineCalculator::DtRailSplineCalculator ( )

virtual DtRailSplineCalculator::~DtRailSplineCalculator ( ) [virtual]

DtRailSplineCalculator::DtRailSplineCalculator ( const DtRailSplineCalculator & orig ) [private]

copy constructor

Member Function Documentation

virtual bool DtRailSplineCalculator::setUpTurnSpline	(	const DtRailSegment *	currentSeg,
		const DtRailSegment *	nextSeg,
		const int	currentLane,
		const int	desiredLane,
		Coordinate_System *	coordinateSystem,
		bool	useDefinedEntry = `false`,
		DtVector	entryPt = `DtVector::zero()`
	)		`[virtual]`

Set up spline to achieve turning from one segment to another. Returns true if able to construct a spline.

virtual bool DtRailSplineCalculator::setUpLaneSwitchSpline	(	const DtVector &	projectedLocation,
		const DtRailSegment *	currentSeg,
		const double	bvolHL,
		const int	currentLane,
		const int	desiredLane,
		Coordinate_System *	coordinateSystem
	)		`[virtual]`

Set up spline to achieve a lane switch.

virtual bool DtRailSplineCalculator::recalculateSpline	(	const DtRailSegment *	currentSeg,
		const DtRailSegment *	nextSeg,
		const int	currentLane,
		const int	passingLane,
		const int	previousSwitchDirection,
		Coordinate_System *	coordinateSystem
	)		`[virtual]`

virtual bool DtRailSplineCalculator::modifySpline	(	const DtVector &	currentLocalPos,
		const DtRailSegment *	currentSeg,
		const DtRailSegment *	nextSeg,
		const int	currentLane,
		const int	passingLane,
		Coordinate_System *	coordinateSystem
	)		`[virtual]`

virtual void DtRailSplineCalculator::calculateTurnPath	(	const DtVector &	pathEntryPt,
		const DtVector &	pathMidPt,
		const DtVector &	pathExitPt
	)		`[virtual]`

generates the turn path needed to provide a smooth turn that connects the segments on the path.

Uses 3 points in the intersection to generate a simple quadratic spline curve. Points are in whatever coordinate systems the supplied path points are in.

virtual DtVector DtRailSplineCalculator::determinePositionAlongCurve ( double distance ) [virtual]

If the entity is using turn smoothing and it is currently turning this will find where on the curve the entity is.

virtual double DtRailSplineCalculator::calculateTurnHeading ( double oldHeading ) [virtual]

Starting from the old heading add the percentage of the difference covered given the spline time.

virtual double DtRailSplineCalculator::calculateLaneSwitchHeading ( double oldHeading ) [virtual]

virtual bool DtRailSplineCalculator::finishTurn	(	double	oldHeading,
		double	newHeading
	)		`[virtual]`

virtual bool DtRailSplineCalculator::finishLaneSwitch	(	double	oldHeading,
		double	newHeading
	)		`[virtual]`

virtual const DtVector& DtRailSplineCalculator::splineLocalEntryPoint ( ) const [virtual]

These are the generated local entry,mid, exit points for the spline transformed from the pathEntryPt,pathMidPt, pathExitPt supplied to the calculateTurnPath function.

virtual const DtVector& DtRailSplineCalculator::splineLocalMidPoint ( ) const [virtual]

virtual const DtVector& DtRailSplineCalculator::splineLocalExitPoint ( ) const [virtual]

virtual const int DtRailSplineCalculator::turnEntryLane ( ) const [virtual]

virtual void DtRailSplineCalculator::setDrivingOnLeft ( bool left ) [virtual]

virtual bool DtRailSplineCalculator::drivingOnLeft ( ) const [virtual]

virtual void DtRailSplineCalculator::setTurnDirection ( const int dir ) [virtual]

These are set by the updater when setUpTurn is called to intialize the spline calculator.

virtual const int DtRailSplineCalculator::turnDirection ( ) const [virtual]

virtual void DtRailSplineCalculator::setLocalToTopoTransform ( const DtCoordTransform & transform ) [virtual]

virtual void DtRailSplineCalculator::setTopoToLocalTransform ( const DtCoordTransform & transform ) [virtual]

virtual void DtRailSplineCalculator::clear ( ) [virtual]

DtRailSplineCalculator& DtRailSplineCalculator::operator= ( const DtRailSplineCalculator & orig ) [private]

assignment operator

Member Data Documentation

double DtRailSplineCalculator::myTotalSplineDistance [protected]

This is the distance along the current segment from turn entry point to end point plus the the distance along the next segment to the turn exit point.

double DtRailSplineCalculator::mySplineTime [protected]

Keeps track of the parametric time, where we are on the curve.

double DtRailSplineCalculator::myHeadingShift [protected]

This is the difference between our current heading and desired heading.

Used to determine the heading of the entity as it moves along the spline.

DtCoordTransform DtRailSplineCalculator::myLocalToTopoTransform [protected]

Transform to.

DtCoordTransform DtRailSplineCalculator::myTopoToLocalTransform [protected]

int DtRailSplineCalculator::myTurnDirection [protected]

Direction of the curve--going to left(-1) or right(1)

int DtRailSplineCalculator::myTurnEntryLane [protected]

Lane we use to entry the turn.