SegmentInPhi0CurvBox Class Reference

Predicate class to check for the containment of segments in a phi0 curv hough space part. More...

#include <SegmentInPhi0CurvBox.h>

Private Member Functions
Weight	operator() (const CDCSegment2D *segment, const Phi0CurvBox *phi0CurvBox)
	Checks if the segment is contained in a phi0 curv hough space.
Weight	operator() (const CDCTrajectory2D *trajectory2D, const Phi0CurvBox *phi0CurvBox)
	Checks if the given trajectory is considered part of the hough box in phi0, curvature space.
Weight	operator() (const CDCFacet *facet, const Phi0CurvBox *phi0CurvBox)
	Checks if the given hit triplet is considered part of the hough box in phi0, curvature space.
bool	isPhi0CurvPointIn (const Vector2D &phi0Vec, const double curvature, const Phi0CurvBox *phi0CurvBox)
	Predicate checking if the phi0 vector and curvature are contained in the given box.

Detailed Description

Predicate class to check for the containment of segments in a phi0 curv hough space part.

Unlike hits segments occupy only a point in the hough space.

Definition at line 26 of file SegmentInPhi0CurvBox.h.

Member Function Documentation

isPhi0CurvPointIn()

bool isPhi0CurvPointIn ( const Vector2D &  phi0Vec, const double  curvature, const Phi0CurvBox *  phi0CurvBox  )

inlineprivate

Predicate checking if the phi0 vector and curvature are contained in the given box.

Definition at line 85 of file SegmentInPhi0CurvBox.h.

      {
 
        const Vector2D& lowerPhi0Vec = phi0CurvBox->getLowerPhi0Vec();
        const Vector2D& upperPhi0Vec = phi0CurvBox->getUpperPhi0Vec();
 
        // Allow containment to keep the reversal symmetry
        if (phi0CurvBox->isIn<1>(curvature)) {
          return phi0Vec.isBetween(lowerPhi0Vec, upperPhi0Vec);
 
        } else if (phi0CurvBox->isIn<1>(-curvature)) {
          return (-phi0Vec).isBetween(lowerPhi0Vec, upperPhi0Vec);
 
        } else {
          return false;
 
        }
 
      }

operator()() [1/3]

Weight operator() ( const CDCFacet *  facet, const Phi0CurvBox *  phi0CurvBox  )

inlineprivate

Checks if the given hit triplet is considered part of the hough box in phi0, curvature space.

Returns a finit weight if it is contained, NAN if not contained.

Definition at line 63 of file SegmentInPhi0CurvBox.h.

      {
        const ParameterLine2D& line = facet->getStartToEndLine();
 
        const Vector2D pos2D = facet->getMiddleRecoPos2D();
        const Vector2D phiVec = line.tangential().unit();
 
        // Calculate the curvature and phi0 of the circle through the origin
        // that touches the position pos2D under the angle phiVec.
        double curvature = 2 * pos2D.cross(phiVec) / pos2D.normSquared();
        Vector2D phi0Vec = phiVec.flippedOver(pos2D);
 
        bool in = isPhi0CurvPointIn(phi0Vec, curvature, phi0CurvBox);
        return in ? 1 : NAN;
        // All facets are currently worth the same weight
        // Facets contain three hits but in general contribute only one
        // additional hit due to overlaps with neighboring facets.
        // Hence we stick with 1 as weight here.
      }

operator()() [2/3]

Weight operator() ( const CDCSegment2D *  segment, const Phi0CurvBox *  phi0CurvBox  )

inlineprivate

Checks if the segment is contained in a phi0 curv hough space.

Returns the size of the segment if it is contained, returns NAN if it is not contained. The method simply assumes that the segment has been fitted with origin constraint and simply uses the values from the contained trajectory The calling code has to ensure this situation

Definition at line 35 of file SegmentInPhi0CurvBox.h.

      {
        if (segment->empty()) return NAN;
        const CDCTrajectory2D& trajectory2D = segment->getTrajectory2D();
        Weight weight = operator()(&trajectory2D, phi0CurvBox);
        return weight * segment->size();
      }

operator()() [3/3]

Weight operator() ( const CDCTrajectory2D *  trajectory2D, const Phi0CurvBox *  phi0CurvBox  )

inlineprivate

Checks if the given trajectory is considered part of the hough box in phi0, curvature space.

Returns a finit weight if it is contained, NAN if not contained.

Definition at line 48 of file SegmentInPhi0CurvBox.h.

      {
        double curvature = trajectory2D->getCurvature();
        const Vector2D& phi0Vec = trajectory2D->getStartUnitMom2D();
 
        bool in = isPhi0CurvPointIn(phi0Vec, curvature, phi0CurvBox);
        return in ? 1 : NAN;
      }

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

• tracking/trackFindingCDC/hough/algorithms/include/SegmentInPhi0CurvBox.h