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// -*- C++ -*-
//
// Package: CalibTracker/SiStripHitResolution
// Class: SiStripOverlapHit
//
/**\class SiStripOverlapHit SiStripOverlapHit.h CalibTracker/SiStripHitResolution/interface/SiStripOverlapHit.cc
Description: A pair of hits on overlaping modules
Implementation:
Designed for CPE studies. Includes methods to compute residuals, etc.
*/
//
// Original Author: Christophe Delaere
// Created: Fri, 20 Sep 2019 14:45:00 GMT
//
//
#ifndef CalibTracker_SiStripHitResolution_SiStripOverlapHit_H
#define CalibTracker_SiStripHitResolution_SiStripOverlapHit_H
#include "DataFormats/TrackerRecHit2D/interface/SiStripRecHit1D.h"
#include "DataFormats/TrackingRecHit/interface/TrackingRecHit.h"
#include "TrackingTools/PatternTools/interface/Trajectory.h"
#include "TrackingTools/PatternTools/interface/TrajectoryMeasurement.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
class SiStripOverlapHit {
public:
using RecHitPointer = TrackingRecHit::RecHitPointer;
using ConstRecHitPointer = TrackingRecHit::ConstRecHitPointer;
// constructes an overlap from 2 hits and a track. Hits are internally sorted inside-out
explicit SiStripOverlapHit(TrajectoryMeasurement const& measA, TrajectoryMeasurement const& measB);
// destructor
virtual ~SiStripOverlapHit() {}
// access to indivitual hits and to the trajectory state
inline ConstRecHitPointer const& hitA() const { return measA_.recHit(); }
inline ConstRecHitPointer const& hitB() const { return measB_.recHit(); }
inline ConstRecHitPointer const& hit(unsigned int hit) const { return hit ? hitB() : hitA(); }
TrajectoryStateOnSurface const& trajectoryStateOnSurface(unsigned int hit = 0, bool updated = true) const;
// utilities
// track local angle
double getTrackLocalAngle(unsigned int hit) const; // 0: average, 1: hit A, 2: hit B
// raw local distance between hit and strajectory state
double offset(unsigned int hit) const;
// distance between the two hits in the "trajectory frame"
double shift() const;
// absolute global distance between the hits (useful to debug pair finding)
double distance(bool fromTrajectory = false) const;
// global position (averaged over the two hits)
GlobalPoint position() const;
private:
TrajectoryMeasurement measA_;
TrajectoryMeasurement measB_;
};
#endif
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