InPhi0ImpactBox Class Reference

Checker if a position is contained in a family of curves over phi0 and impact. More...

#include <InPhi0ImpactBox.h>

Public Types
using	HoughBox = Box< DiscretePhi0, ContinuousImpact >
	The box to which this object corresponds.

Public Member Functions
	InPhi0ImpactBox (float curlCurv=NAN)
	Constructor taking the curler curvature - give a zero greater 0 to activate one arm exclusive finding.
ESign	getDistanceSign (const HoughBox &houghBox, float x, float y, float l, float=0, float=0, ILayer=-1) const
	Function that gives the sign of the distance from an observed drift circle to the family of curves.

Private Attributes
float	m_curlCurv
	Curler curvature - set to value greater zero to activate one arm exclusive finding.

Detailed Description

Checker if a position is contained in a family of curves over phi0 and impact.

Definition at line 24 of file InPhi0ImpactBox.h.

Member Typedef Documentation

HoughBox

using HoughBox = Box<DiscretePhi0, ContinuousImpact>

The box to which this object corresponds.

Definition at line 34 of file InPhi0ImpactBox.h.

Constructor & Destructor Documentation

InPhi0ImpactBox()

InPhi0ImpactBox ( float  curlCurv = NAN )

inlineexplicit

Constructor taking the curler curvature - give a zero greater 0 to activate one arm exclusive finding.

Definition at line 28 of file InPhi0ImpactBox.h.

        : m_curlCurv(curlCurv)
      {}

Member Function Documentation

getDistanceSign()

ESign getDistanceSign ( const HoughBox &  houghBox, float  x, float  y, float  l, float  = 0, float  = 0, ILayer  = -1  ) const

inline

Function that gives the sign of the distance from an observed drift circle to the family of curves.

Returns

• ESign::c_Plus if the drift circle is always on the positive / right site
• ESign::c_Minus means the drift circle is always on the negative / left site
• ESign::c_Zero if the drift circle lies on any of the curves
• ESign::c_Invalid if the drift circle is on the wrong arm of the curve.

Definition at line 45 of file InPhi0ImpactBox.h.

      {
        const std::array<DiscretePhi0, 2>& phi0Vec = houghBox.getBounds<DiscretePhi0>();
        const std::array<ContinuousImpact, 2>& impact = houghBox.getBounds<ContinuousImpact>();
 
        std::array<float, 2> xRot;
        xRot[0] = x * phi0Vec[0]->x() + y * phi0Vec[0]->y();
        xRot[1] = x * phi0Vec[1]->x() + y * phi0Vec[1]->y();
 
        const bool onlyPositiveArm = 0 < m_curlCurv;
        if (onlyPositiveArm) {
          // Reject hit if it is on the inward going branch but the curvature suggest it is no curler
          if (xRot[0] < 0 and xRot[1] < 0) return ESign::c_Invalid;
        }
 
        std::array<float, 2> yRotPlusL;
        yRotPlusL[0] = -x * phi0Vec[0]->y() + y * phi0Vec[0]->x() + l;
        yRotPlusL[1] = -x * phi0Vec[1]->y() + y * phi0Vec[1]->x() + l;
 
        // Using binary notation encoding lower and upper box bounds to fill the flat array.
        std::array<float, 4> dist;
        dist[0b00] = yRotPlusL[0] - static_cast<float>(impact[0]);
        dist[0b10] = yRotPlusL[1] - static_cast<float>(impact[0]);
        dist[0b01] = yRotPlusL[0] - static_cast<float>(impact[1]);
        dist[0b11] = yRotPlusL[1] - static_cast<float>(impact[1]);
 
        return ESignUtil::common(dist);
      }

Member Data Documentation

m_curlCurv

float m_curlCurv

private

Curler curvature - set to value greater zero to activate one arm exclusive finding.

Definition at line 82 of file InPhi0ImpactBox.h.

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

• tracking/trackFindingCDC/hough/algorithms/include/InPhi0ImpactBox.h