HelixLineExtrapolation Class Reference

#include <HelixLineExtrapolation.h>

Inheritance diagram for HelixLineExtrapolation:

Public Types
typedef Basic3DVector< float >	DirectionType
typedef Basic3DVector< double >	DirectionTypeDouble
typedef Basic3DVector< float >	PositionType
typedef Basic3DVector< double >	PositionTypeDouble

Public Member Functions
virtual DirectionType	direction (double s) const =0
virtual std::pair< bool, double >	pathLength (const GlobalPoint &point) const =0
virtual std::pair< bool, double >	pathLength (const Line &line) const =0
virtual PositionType	position (double s) const =0

Detailed Description

Abstract interface for the extrapolation of a helix to the closest approach to a line.

Definition at line 17 of file HelixLineExtrapolation.h.

Member Typedef Documentation

typedef Basic3DVector<float> HelixLineExtrapolation::DirectionType

Definition at line 25 of file HelixLineExtrapolation.h.

typedef Basic3DVector<double> HelixLineExtrapolation::DirectionTypeDouble

Definition at line 27 of file HelixLineExtrapolation.h.

typedef Basic3DVector<float> HelixLineExtrapolation::PositionType

The types for position and direction are frame-neutral (not global, local, etc.) so this interface can be used in any frame. Of course, the helix and the plane must be defined in the same frame, which is also the frame of the result.

Definition at line 24 of file HelixLineExtrapolation.h.

typedef Basic3DVector<double> HelixLineExtrapolation::PositionTypeDouble

Definition at line 26 of file HelixLineExtrapolation.h.

Member Function Documentation

virtual DirectionType HelixLineExtrapolation::direction ( double  s ) const

pure virtual

Returns the direction along the helix that corresponds to path length "s" from the starting point. As for position, the direction at the closest approach (if it exists!) is given by direction( pathLength(line) ).

Implemented in HelixExtrapolatorToLine2Order, and IterativeHelixExtrapolatorToLine.

virtual std::pair<bool,double> HelixLineExtrapolation::pathLength ( const GlobalPoint &  point ) const

pure virtual

Propagation status (true if valid) and (signed) path length along the helix from the starting point to the closest approach to the point. The starting point is given in the constructor.

Implemented in HelixExtrapolatorToLine2Order, and IterativeHelixExtrapolatorToLine.

virtual std::pair<bool,double> HelixLineExtrapolation::pathLength ( const Line &  line ) const

pure virtual

Propagation status (true if valid) and (signed) path length along the helix from the starting point to the closest approach to the line. The starting point is given in the constructor.

Implemented in HelixExtrapolatorToLine2Order, and IterativeHelixExtrapolatorToLine.

virtual PositionType HelixLineExtrapolation::position ( double  s ) const

pure virtual

Returns the position along the helix that corresponds to path length "s" from the starting point. If s is obtained from the pathLength method the position is the destination point, i.e. the position at the closest approach (if it exists!) is given by position( pathLength(line) ).

Implemented in HelixExtrapolatorToLine2Order, and IterativeHelixExtrapolatorToLine.