MuonCalib::MuonCalibSLPropagator Class Reference

straight line propagator More...

#include <MuonCalibSLPropagator.h>

Collaboration diagram for MuonCalib::MuonCalibSLPropagator:

Public Member Functions
Amg::Vector3D	propagateToPlane (const Amg::Vector3D &pos, const Amg::Vector3D &dir, const Amg::Vector3D &planePos, const Amg::Vector3D &planeNormal) const
	Propagator track parameters to a plane. More...
Amg::Vector3D	propagateToPlane (const Amg::Vector3D &pos, const Amg::Vector3D &dir, double zPosPlane) const
	Propagator track parameters to a plane paralel to the xy plane. More...
Amg::Vector3D	propagateToCylinder (const Amg::Vector3D &pos, const Amg::Vector3D &dir, double radiusCylinder) const
	Propagator track parameters to a cylinder paralel to the z-axis, centered at (0.,0.) in the xy plane. More...
Amg::Vector3D	propagateToStraightLine (const Amg::Vector3D &pos, const Amg::Vector3D &dir, const Amg::Vector3D &posLine, const Amg::Vector3D &dirLine) const
	Propagator track parameters to a straight line. More...
Amg::Vector3D	propagateToPerigee (const Amg::Vector3D &pos, const Amg::Vector3D &dir) const
	Propagator track parameters to the perigee. More...
Amg::Vector3D	propagate (const Amg::Vector3D &pos, const Amg::Vector3D &dir, const MuonCalibSurface &surf) const
	Propagator track parameters to a plane paralel to the xy plane. More...
Amg::Vector3D	propagate (const Amg::Vector3D &pos, const Amg::Vector3D &dir, const MuonCalibDisk &disk) const
	Propagator track parameters to a plane paralel to the xy plane. More...
Amg::Vector3D	propagate (const Amg::Vector3D &pos, const Amg::Vector3D &dir, const MuonCalibCylinder &cylinder) const
	Propagator track parameters to a plane paralel to the xy plane. More...

Detailed Description

straight line propagator

Definition at line 17 of file MuonCalibSLPropagator.h.

Member Function Documentation

propagate() [1/3]

Amg::Vector3D MuonCalib::MuonCalibSLPropagator::propagate	(	const Amg::Vector3D &	pos,
		const Amg::Vector3D &	dir,
		const MuonCalibCylinder &	cylinder
	)		const

Propagator track parameters to a plane paralel to the xy plane.

Parameters

pos	position on the parameters
dir	direction of the parameters
cylinder	destination cylinder

Returns

position on the cylinder

Definition at line 59 of file MuonCalibSLPropagator.cxx.

                                                                                            {
        return propagateToCylinder(pos, dir, cylinder.radius);
    }

propagate() [2/3]

Amg::Vector3D MuonCalib::MuonCalibSLPropagator::propagate	(	const Amg::Vector3D &	pos,
		const Amg::Vector3D &	dir,
		const MuonCalibDisk &	disk
	)		const

Propagator track parameters to a plane paralel to the xy plane.

Parameters

pos	position on the parameters
dir	direction of the parameters
disk	destination disk

Returns

position on the plane

Definition at line 55 of file MuonCalibSLPropagator.cxx.

                                                                                                                                {
        return propagateToPlane(pos, dir, disk.zPos);
    }

propagate() [3/3]

Amg::Vector3D MuonCalib::MuonCalibSLPropagator::propagate	(	const Amg::Vector3D &	pos,
		const Amg::Vector3D &	dir,
		const MuonCalibSurface &	surf
	)		const

Propagator track parameters to a plane paralel to the xy plane.

Parameters

pos	position on the parameters
dir	direction of the parameters
disk	destination disk

Returns

position on the surface

Definition at line 64 of file MuonCalibSLPropagator.cxx.

                                                                                                                                   {
        const MuonCalibDisk* disk = dynamic_cast<const MuonCalibDisk*>(&surf);
        if (disk) return propagate(pos, dir, *disk);
 
        const MuonCalibCylinder* cylinder = dynamic_cast<const MuonCalibCylinder*>(&surf);
        if (cylinder) return propagate(pos, dir, *cylinder);
        MsgStream log(Athena::getMessageSvc(), "MuonCalibSLPropagator");
        log << MSG::WARNING << "propagation failed, unkown surface type" << endmsg;
        return Amg::Vector3D(0., 0., 0.);
    }

propagateToCylinder()

Amg::Vector3D MuonCalib::MuonCalibSLPropagator::propagateToCylinder	(	const Amg::Vector3D &	pos,
		const Amg::Vector3D &	dir,
		double	radiusCylinder
	)		const

Propagator track parameters to a cylinder paralel to the z-axis, centered at (0.,0.) in the xy plane.

Parameters

pos	position on the parameters
dir	direction of the parameters
radius	of the cylinder

Returns

position on the cylinder

Definition at line 31 of file MuonCalibSLPropagator.cxx.

                                                                                          {
        double sinThsqinv = 1. / dir.perp2();
        double stepLength = (-pos.x() * dir.x() - pos.y() * dir.y()) * sinThsqinv;
        double deltaRSq = (radiusCylinder * radiusCylinder - pos.perp2()) * sinThsqinv + stepLength * stepLength;
        if (deltaRSq > 0.) stepLength += std::sqrt(deltaRSq);
 
        return pos + dir * stepLength;
    }

propagateToPerigee()

Amg::Vector3D MuonCalib::MuonCalibSLPropagator::propagateToPerigee	(	const Amg::Vector3D &	pos,
		const Amg::Vector3D &	dir
	)		const

Propagator track parameters to the perigee.

Parameters

pos	position on the parameters
dir	direction of the parameters

Returns

position at perigee

Definition at line 48 of file MuonCalibSLPropagator.cxx.

                                                                                                              {
        // calculate distance to perigee
        Amg::Vector3D dirLine(0., 0., 1.);
        Amg::Vector3D posLine(0., 0., 0.);
        return propagateToStraightLine(pos, dir, posLine, dirLine);
    }

propagateToPlane() [1/2]

Amg::Vector3D MuonCalib::MuonCalibSLPropagator::propagateToPlane	(	const Amg::Vector3D &	pos,
		const Amg::Vector3D &	dir,
		const Amg::Vector3D &	planePos,
		const Amg::Vector3D &	planeNormal
	)		const

Propagator track parameters to a plane.

Parameters

pos	position on the parameters
dir	direction of the parameters
planePos	position of the plane
normal	of the plane

Returns

position on the plane

Definition at line 15 of file MuonCalibSLPropagator.cxx.

                                                                                                {
        double denom = dir.dot(planeNormal);
        if (std::abs(denom) < 0.00001) denom = 0.00001;
        double u = (planeNormal.dot(planePos - pos)) / (denom);
        return pos + u * dir;
    }

propagateToPlane() [2/2]

Amg::Vector3D MuonCalib::MuonCalibSLPropagator::propagateToPlane	(	const Amg::Vector3D &	pos,
		const Amg::Vector3D &	dir,
		double	zPosPlane
	)		const

Propagator track parameters to a plane paralel to the xy plane.

Parameters

pos	position on the parameters
dir	direction of the parameters
zPosPlane	z position of the plane

Returns

position on the plane

Definition at line 23 of file MuonCalibSLPropagator.cxx.

                                                                                                                              {
        // calculate intersect pattern measurement plane
        Amg::Vector3D planePos(0., 0., zPosPlane);
        Amg::Vector3D planeNormal(0., 0., 1.);
 
        return propagateToPlane(pos, dir, planePos, planeNormal);
    }

propagateToStraightLine()

Amg::Vector3D MuonCalib::MuonCalibSLPropagator::propagateToStraightLine	(	const Amg::Vector3D &	pos,
		const Amg::Vector3D &	dir,
		const Amg::Vector3D &	posLine,
		const Amg::Vector3D &	dirLine
	)		const

Propagator track parameters to a straight line.

Parameters

pos	position on the parameters
dir	direction of the parameters
posLine	position on the line
dirLine	direction of the line

Returns

point of closest approach to line

Definition at line 41 of file MuonCalibSLPropagator.cxx.

                                                                                                                               {
        double cosAngle = dirLine.dot(dir);
        double stepLength = (posLine - pos).dot(dir - dirLine * cosAngle) / (1. - cosAngle * cosAngle);
        return pos + stepLength * dir;
    }

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

• MuonCalibSLPropagator.h
• MuonCalibSLPropagator.cxx