// Copyright 2019-2020 CERN and copyright holders of ALICE O2.

// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.

// All rights not expressly granted are reserved.

//

// This software is distributed under the terms of the GNU General Public

// License v3 (GPL Version 3), copied verbatim in the file "COPYING".

//

// In applying this license CERN does not waive the privileges and immunities

// granted to it by virtue of its status as an Intergovernmental Organization

// or submit itself to any jurisdiction.

/// @file EventVertex.h

/// @author ruben.shahoyan@cern.ch, michael.lettrich@cern.ch

/// @since 2021-02-01

/// @brief Special fake "sensor" for event vertex.

/**

* Special fake "sensor" for event vertex.

* It is needed to allow adjustement of the global IP position

* if the event event is used as a measured point.

* Its degrees of freedom of LOCAL X,Y,Z, coinciding with

* GLOBAL X,Y,Z.

* Since the vertex added to the track as a mesured point must be

* defined in the frame with X axis along the tracks, the T2L

* matrix of this sensor need to be recalculated for each track!

*/

#ifndef EVENTVERTEX_H

#define EVENTVERTEX_H

#include "Align/AlignableSensor.h"

class AlignmentPoint;

namespace o2

{

namespace align

{

class Controller;

class EventVertex : public AlignableSensor

{

public:

EventVertex() = default;

EventVertex(Controller* ctr);

//

void applyCorrection(double* vtx) const;

bool isSensor() const final { return true; }

//

void setAlpha(double alp)

{

mAlp = alp;

prepareMatrixT2L();

}

void prepareMatrixL2G(bool = 0) final { mMatL2G.Clear(); } // unit matrix

void prepareMatrixL2GIdeal() final { mMatL2GIdeal.Clear(); } // unit matrix

void prepareMatrixT2L() final;

//

protected:

EventVertex(const EventVertex&);

EventVertex& operator=(const EventVertex&);

//

protected:

//

ClassDef(EventVertex, 1);

};

} // namespace align

} // namespace o2

#endif