DtRailSplineCalculator Class Reference

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 std::list< DtVector >	getCurvePoints ()
	Generate a set of about 10 points that lie along the spline from start to end. For debugging.
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.
int	myTurnDirection
	Direction of the curve–going to left(-1) or right(1)
int	myTurnEntryLane
	Lane we use to enter 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.
DtCoordTransform	myLocalToTopoTransform
	These aren't really topographic coordinate transforms; they transform to from a coordinate system that has xy in the horizontal plane (like topographic) but x oriented in the segment direction.
DtCoordTransform	myTopoToLocalTransform

Private Member Functions
	DtRailSplineCalculator (const DtRailSplineCalculator &orig)
	copy constructor
DtRailSplineCalculator &	operator= (const DtRailSplineCalculator &orig)
	assignment operator

Constructor & Destructor Documentation

DtRailSplineCalculator::DtRailSplineCalculator

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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 std::list<DtVector> DtRailSplineCalculator::getCurvePoints ( )

virtual

Generate a set of about 10 points that lie along the spline from start to end. For debugging.

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

These aren't really topographic coordinate transforms; they transform to from a coordinate system that has xy in the horizontal plane (like topographic) but x oriented in the segment direction.

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 enter the turn.

bool DtRailSplineCalculator::myDrivingOnLeft

protected

Are we driving on the left or right side of the road.

This affects how you set up the turn splines!

DtVector DtRailSplineCalculator::myLocalEntryPoint

protected

The points used to generate the spline in local coordinates.

DtVector DtRailSplineCalculator::myLocalMidPoint

protected

DtVector DtRailSplineCalculator::myLocalExitPoint

protected

std::vector<DtVector> DtRailSplineCalculator::mySplineCoefficents

protected

The spline coefficents used to determine a position along a curve.

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The documentation for this class was generated from the following file:

• /exports/nfedora7-1/nightly/docs/vrforcesDevelopment.tot/include/vrfmodel/railSplineCalculator.h