#include <acts/blob/master/Core/include/Acts/Surfaces/LineSurface.hpp>

Inheritance diagram for Acts::LineSurface:

Collaboration diagram for Acts::LineSurface:

Public Member Functions
	~LineSurface () override=default
	Destructor - defaulted.

	LineSurface ()=delete
	Default Constructor - deleted.

LineSurface &	operator= (const LineSurface &other)

const Vector3D	normal (const GeometryContext &gctx, const Vector2D &lposition) const final

const Vector3D	binningPosition (const GeometryContext &gctx, BinningValue bValue) const final

const RotationMatrix3D	referenceFrame (const GeometryContext &gctx, const Vector3D &position, const Vector3D &momentum) const final

void	initJacobianToGlobal (const GeometryContext &gctx, BoundToFreeMatrix &jacobian, const Vector3D &position, const Vector3D &direction, const BoundVector &pars) const final

const BoundRowVector	derivativeFactors (const GeometryContext &gctx, const Vector3D &position, const Vector3D &direction, const RotationMatrix3D &rft, const BoundToFreeMatrix &jacobian) const final

void	localToGlobal (const GeometryContext &gctx, const Vector2D &lposition, const Vector3D &momentum, Vector3D &position) const final

bool	globalToLocal (const GeometryContext &gctx, const Vector3D &position, const Vector3D &momentum, Vector2D &lposition) const final

Intersection	intersectionEstimate (const GeometryContext &gctx, const Vector3D &position, const Vector3D &direction, const BoundaryCheck &bcheck=false) const final
	Straight line intersection schema.

double	pathCorrection (const GeometryContext &gctx, const Vector3D &position, const Vector3D &momentum) const override

const SurfaceBounds &	bounds () const final
	This method returns the bounds of the Surface by reference */.

std::string	name () const override
	Return properly formatted class name for screen output */.

Public Member Functions inherited from Acts::Surface
virtual	~Surface ()

std::shared_ptr< Surface >	getSharedPtr ()

std::shared_ptr< const Surface >	getSharedPtr () const

Surface &	operator= (const Surface &other)

virtual bool	operator== (const Surface &other) const

virtual bool	operator!= (const Surface &sf) const

virtual SurfaceType	type () const =0
	Return method for the Surface type to avoid dynamic casts.

virtual const Transform3D &	transform (const GeometryContext &gctx) const

virtual const Vector3D	center (const GeometryContext &gctx) const

virtual const Vector3D	normal (const GeometryContext &gctx, const Vector3D &position) const

virtual const Vector3D	normal (const GeometryContext &gctx) const

const DetectorElementBase *	associatedDetectorElement () const

const Layer *	associatedLayer () const

void	associateLayer (const Layer &lay)

const ISurfaceMaterial *	surfaceMaterial () const

const std::shared_ptr< const ISurfaceMaterial > &	surfaceMaterialSharedPtr () const

void	assignSurfaceMaterial (std::shared_ptr< const ISurfaceMaterial > material)

bool	isOnSurface (const GeometryContext &gctx, const Vector3D &position, const Vector3D &momentum, const BoundaryCheck &bcheck=true) const

virtual bool	insideBounds (const Vector2D &lposition, const BoundaryCheck &bcheck=true) const

virtual const RotationMatrix3D	initJacobianToLocal (const GeometryContext &gctx, FreeToBoundMatrix &jacobian, const Vector3D &position, const Vector3D &direction) const

virtual SurfaceIntersection	intersect (const GeometryContext &gctx, const Vector3D &position, const Vector3D &direction, const BoundaryCheck &bcheck) const

virtual std::ostream &	toStream (const GeometryContext &gctx, std::ostream &sl) const

virtual Polyhedron	polyhedronRepresentation (const GeometryContext &gctx, size_t lseg) const =0

Public Member Functions inherited from Acts::GeometryObject
	GeometryObject ()=default
	Defaulted construrctor.

	GeometryObject (const GeometryObject &)=default
	Defaulted copy constructor.

	GeometryObject (const GeometryID &geoID)

GeometryObject &	operator= (const GeometryObject &geoID)

const GeometryID &	geoID () const

virtual double	binningPositionValue (const GeometryContext &gctx, BinningValue bValue) const

void	assignGeoID (const GeometryID &geoID)

Protected Member Functions
	LineSurface (std::shared_ptr< const Transform3D > htrans, double radius, double halez)

	LineSurface (std::shared_ptr< const Transform3D > htrans, std::shared_ptr< const LineBounds > lbounds=nullptr)

	LineSurface (const std::shared_ptr< const LineBounds > &lbounds, const DetectorElementBase &detelement)

	LineSurface (const LineSurface &other)

	LineSurface (const GeometryContext &gctx, const LineSurface &other, const Transform3D &transf)

Protected Member Functions inherited from Acts::Surface
	Surface (std::shared_ptr< const Transform3D > tform=nullptr)

	Surface (const Surface &other)

	Surface (const DetectorElementBase &detelement)

	Surface (const GeometryContext &gctx, const Surface &other, const Transform3D &shift)

Protected Attributes
std::shared_ptr< const LineBounds >	m_bounds
	bounds (shared)

Protected Attributes inherited from Acts::Surface
std::shared_ptr< const Transform3D >	m_transform

const DetectorElementBase *	m_associatedDetElement {nullptr}
	Pointer to the a DetectorElementBase.

const Layer *	m_associatedLayer {nullptr}

const TrackingVolume *	m_associatedTrackingVolume {nullptr}

std::shared_ptr< const ISurfaceMaterial >	m_surfaceMaterial
	Possibility to attach a material descrption.

Protected Attributes inherited from Acts::GeometryObject
GeometryID	m_geoID

Private Member Functions
bool	globalToLocalPlain (const GeometryContext &gctx, const Vector3D &position, const Vector3D &momentum, Vector2D &lposition) const

Private Attributes
friend	Surface

Additional Inherited Members
Public Types inherited from Acts::Surface
enum	SurfaceType { Cone = 0, Cylinder = 1, Disc = 2, Perigee = 3, Plane = 4, Straw = 5, Curvilinear = 6, Other = 7 }

Static Public Member Functions inherited from Acts::Surface
template<class T , typename... Args>
static std::shared_ptr< T >	makeShared (Args &&...args)

Detailed Description

Base class for a linear surfaces in the TrackingGeometry to describe dirft tube, straw like detectors or the Perigee It inherits from Surface.

Note: It leaves the type() method virtual, so it can not be instantiated

Definition at line 31 of file LineSurface.hpp.

View newest version in sPHENIX GitHub at line 31 of file LineSurface.hpp

Constructor & Destructor Documentation

Acts::LineSurface::LineSurface	(	std::shared_ptr< const Transform3D >	htrans,
		double	radius,
		double	halez
	)

protected

Constructor from Transform3D and bounds

Parameters

htrans	The transform that positions the surface in the global frame
radius	The straw radius
halez	The half length in z

Definition at line 18 of file LineSurface.cpp.

View newest version in sPHENIX GitHub at line 18 of file LineSurface.cpp

Acts::LineSurface::LineSurface	(	std::shared_ptr< const Transform3D >	htrans,
		std::shared_ptr< const LineBounds >	lbounds = `nullptr`
	)

protected

Constructor from Transform3D and a shared bounds object

Parameters

htrans	The transform that positions the surface in the global frame
lbounds	The bounds describing the straw dimensions, can be optionally nullptr

Definition at line 24 of file LineSurface.cpp.

View newest version in sPHENIX GitHub at line 24 of file LineSurface.cpp

Acts::LineSurface::LineSurface	(	const std::shared_ptr< const LineBounds > &	lbounds,
		const DetectorElementBase &	detelement
	)

protected

Constructor from DetectorElementBase : Element proxy

Parameters

lbounds	The bounds describing the straw dimensions
detelement	for which this surface is (at least) one representation

Definition at line 30 of file LineSurface.cpp.

View newest version in sPHENIX GitHub at line 30 of file LineSurface.cpp

References throw_assert.

Acts::LineSurface::LineSurface ( const LineSurface & other )

protected

Copy constructor

Parameters

other The source surface for copying

Definition at line 36 of file LineSurface.cpp.

View newest version in sPHENIX GitHub at line 36 of file LineSurface.cpp

Acts::LineSurface::LineSurface	(	const GeometryContext &	gctx,
		const LineSurface &	other,
		const Transform3D &	transf
	)

protected

Copy constructor - with shift

Parameters

gctx	The current geometry context object, e.g. alignment
other	is the source cone surface
transf	is the additional transfrom applied after copying

Definition at line 39 of file LineSurface.cpp.

View newest version in sPHENIX GitHub at line 39 of file LineSurface.cpp

Acts::LineSurface::~LineSurface ( )

overridedefault

Destructor - defaulted.

Acts::LineSurface::LineSurface ( )

delete

Default Constructor - deleted.

Member Function Documentation

const Vector3D LineSurface::binningPosition	(	const GeometryContext &	gctx,
		BinningValue	bValue
	)		const

inlinefinalvirtual

The binning position is the position calcualted for a certain binning type

Parameters

gctx	The current geometry context object, e.g. alignment
bValue	is the binning type to be used

Returns: position that can beused for this binning

Implements Acts::GeometryObject.

Definition at line 76 of file LineSurface.ipp.

View newest version in sPHENIX GitHub at line 76 of file LineSurface.ipp

const SurfaceBounds & LineSurface::bounds ( ) const

inlinefinalvirtual

This method returns the bounds of the Surface by reference */.

Implements Acts::Surface.

Definition at line 87 of file LineSurface.ipp.

View newest version in sPHENIX GitHub at line 87 of file LineSurface.ipp

References Acts::s_noBounds.

Referenced by Acts::Test::BOOST_AUTO_TEST_CASE().

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const BoundRowVector LineSurface::derivativeFactors	(	const GeometryContext &	gctx,
		const Vector3D &	position,
		const Vector3D &	direction,
		const RotationMatrix3D &	rft,
		const BoundToFreeMatrix &	jacobian
	)		const

inlinefinalvirtual

Calculate the form factors for the derivatives the calculation is identical for all surfaces where the reference frame does not depend on the direction

Parameters

gctx	The current geometry context object, e.g. alignment
position	is the position of the paramters in global
direction	is the direction of the track
rft	is the transposed reference frame (avoids recalculation)
jacobian	is the transport jacobian

Returns: a five-dim vector

Reimplemented from Acts::Surface.

Definition at line 189 of file LineSurface.ipp.

View newest version in sPHENIX GitHub at line 189 of file LineSurface.ipp

References Acts::eBoundParametersSize, norm, and pc.

bool LineSurface::globalToLocal	(	const GeometryContext &	gctx,
		const Vector3D &	position,
		const Vector3D &	momentum,
		Vector2D &	lposition
	)		const

inlinefinalvirtual

Specified for LineSurface: global to local method without dynamic memory allocation

This method is the true global->local transformation.
makes use of globalToLocal and indicates the sign of the Acts::eLOC_R by the given momentum

The calculation of the sign of the radius (or $ d_0 $ ) can be done as follows:
May $\vec d = \vec m - \vec c$ denote the difference between the center of the line and the global position of the measurement/predicted state, then $\vec d$ lies within the so called measurement plane. The measurement plane is determined by the two orthogonal vectors $\vec{measY}= \vec{Acts::eLOC_Z}$ and $\vec{measX} = \vec{measY} \times \frac{\vec{p}}{|\vec{p}|}$ .

The sign of the radius ( $d_{0}$ ) is then defined by the projection of $\vec{d}$ onto $\vec{measX}$ :
$sign = -sign(\vec{d} \cdot \vec{measX})$

Parameters

gctx	The current geometry context object, e.g. alignment
position	global 3D position - considered to be on surface but not inside bounds (check is done)
momentum	global 3D momentum representation (optionally ignored)
lposition	local 2D position to be filled (given by reference for method symmetry)

Returns: boolean indication if operation was successful (fail means global position was not on surface)

Implements Acts::Surface.

Definition at line 29 of file LineSurface.ipp.

View newest version in sPHENIX GitHub at line 29 of file LineSurface.ipp

References Acts::eLOC_R, Acts::VectorHelpers::perp(), position, sign(), and Acts::Test::transform.

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bool Acts::LineSurface::globalToLocalPlain	(	const GeometryContext &	gctx,
		const Vector3D &	position,
		const Vector3D &	momentum,
		Vector2D &	lposition
	)		const

private

helper function to apply the globalToLocal with out transform

Parameters

gctx	The current geometry context object, e.g. alignment
position	is the global position
momentum	is the momentum
lposition	is the local position to be filled

void LineSurface::initJacobianToGlobal	(	const GeometryContext &	gctx,
		BoundToFreeMatrix &	jacobian,
		const Vector3D &	position,
		const Vector3D &	direction,
		const BoundVector &	pars
	)		const

inlinefinalvirtual

Initialize the jacobian from local to global the surface knows best, hence the calculation is done here. The jacobian is assumed to be initialised, so only the relevant entries are filled

Parameters

gctx	The current geometry context object, e.g. alignment
jacobian	is the jacobian to be initialized
position	is the global position of the parameters
direction	is the direction at of the parameters
pars	is the paranmeters vector

Reimplemented from Acts::Surface.

Definition at line 138 of file LineSurface.ipp.

View newest version in sPHENIX GitHub at line 138 of file LineSurface.ipp

References Acts::VectorHelpers::cross(), Acts::eLOC_0, Acts::ePHI, Acts::eQOP, Acts::eT, Acts::eTHETA, x, y, and z.

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Intersection LineSurface::intersectionEstimate	(	const GeometryContext &	gctx,
		const Vector3D &	position,
		const Vector3D &	direction,
		const BoundaryCheck &	bcheck = `false`
	)		const

inlinefinalvirtual

Straight line intersection schema.

Parameters

gctx	The current geometry context object, e.g. alignment
position	The global position as a starting point
direction	The global direction at the starting point

Note: exptected to be normalized

Parameters

bcheck The boundary check directive for the estimate

mathematical motivation: Given two lines in parameteric form:

$\vec l_{a}(\lambda) = \vec m_a + \lambda \cdot \vec e_{a}$
$\vec l_{b}(\mu) = \vec m_b + \mu \cdot \vec e_{b}$
the vector between any two points on the two lines is given by:
$\vec s(\lambda, \mu) = \vec l_{b} - l_{a} = \vec m_{ab} + \mu \cdot \vec e_{b} - \lambda \cdot \vec e_{a}$ ,
when $\vec m_{ab} = \vec m_{b} - \vec m_{a}$ .
$\vec s(u, \mu_0)$ denotes the vector between the two closest points
$\vec l_{a,0} = l_{a}(u)$ and $\vec l_{b,0} = l_{b}(\mu_0)$
and is perpendicular to both, $\vec e_{a}$ and $\vec e_{b}$ .

This results in a system of two linear equations:

(i) $0 = \vec s(u, \mu_0) \cdot \vec e_a = \vec m_ab \cdot \vec e_a + \mu_0 \vec e_a \cdot \vec e_b - u$
(ii) $0 = \vec s(u, \mu_0) \cdot \vec e_b = \vec m_ab \cdot \vec e_b + \mu_0 - u \vec e_b \cdot \vec e_a$

Solving (i), (ii) for $ u $ and $\mu_0$ yields:

$u = \frac{(\vec m_ab \cdot \vec e_a)-(\vec m_ab \cdot \vec e_b)(\vec e_a \cdot \vec e_b)}{1-(\vec e_a \cdot \vec e_b)^2}$
$\mu_0 = - \frac{(\vec m_ab \cdot \vec e_b)-(\vec m_ab \cdot \vec e_a)(\vec e_a \cdot \vec e_b)}{1-(\vec e_a \cdot \vec e_b)^2}$

Returns: is the intersection object

Implements Acts::Surface.

Definition at line 94 of file LineSurface.ipp.

View newest version in sPHENIX GitHub at line 94 of file LineSurface.ipp

References denom, max, norm, position, Acts::s_onSurfaceTolerance, Acts::Test::transform, and Acts::UnitConstants::u.

void LineSurface::localToGlobal	(	const GeometryContext &	gctx,
		const Vector2D &	lposition,
		const Vector3D &	momentum,
		Vector3D &	position
	)		const

inlinefinalvirtual

Local to global transformation for line surfaces the momentum is used in order to interpret the drift radius

Parameters

gctx	The current geometry context object, e.g. alignment
lposition	is the local position to be transformed
momentum	is the global momentum (used to sign the closest approach)
position	is the global position which is filled

Implements Acts::Surface.

Definition at line 13 of file LineSurface.ipp.

View newest version in sPHENIX GitHub at line 13 of file LineSurface.ipp

References Acts::eLOC_R, Acts::eLOC_Z, and Acts::Test::transform.

std::string LineSurface::name ( ) const

inlineoverridevirtual

Return properly formatted class name for screen output */.

Implements Acts::Surface.

Reimplemented in Acts::StrawSurface, and Acts::PerigeeSurface.

Definition at line 50 of file LineSurface.ipp.

View newest version in sPHENIX GitHub at line 50 of file LineSurface.ipp

const Vector3D LineSurface::normal	(	const GeometryContext &	gctx,
		const Vector2D &	lposition
	)		const

inlinefinalvirtual

Normal vector return

Parameters

gctx	The current geometry context object, e.g. alignment
lposition	is the local position is ignored

Returns: a Vector3D by value

Implements Acts::Surface.

Definition at line 81 of file LineSurface.ipp.

View newest version in sPHENIX GitHub at line 81 of file LineSurface.ipp

References Acts::Test::transform.

Acts::LineSurface & Acts::LineSurface::operator= ( const LineSurface & other )

Assignment operator

Parameters

slsf	is the source surface dor copying

Definition at line 46 of file LineSurface.cpp.

View newest version in sPHENIX GitHub at line 46 of file LineSurface.cpp

References m_bounds, and Acts::Surface::operator=().

Referenced by Acts::Test::LineSurfaceStub::operator=(), Acts::PerigeeSurface::operator=(), and Acts::StrawSurface::operator=().

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double LineSurface::pathCorrection	(	const GeometryContext &	gctx,
		const Vector3D &	position,
		const Vector3D &	momentum
	)		const

inlineoverridevirtual

the pathCorrection for derived classes with thickness is by definition 1 for LineSurfaces

Note: input parameters are ignored; there's no material associated to the line surface

Implements Acts::Surface.

Definition at line 70 of file LineSurface.ipp.

View newest version in sPHENIX GitHub at line 70 of file LineSurface.ipp

const RotationMatrix3D LineSurface::referenceFrame	(	const GeometryContext &	gctx,
		const Vector3D &	position,
		const Vector3D &	momentum
	)		const

inlinefinalvirtual

Return the measurement frame - this is needed for alignment, in particular

for StraightLine and Perigee Surface

the default implementation is the the RotationMatrix3D of the transform

Parameters

gctx	The current geometry context object, e.g. alignment
position	is the global position where the measurement frame is constructed
momentum	is the momentum used for the measurement frame construction

Returns: is a rotation matrix that indicates the measurement frame

Reimplemented from Acts::Surface.

Definition at line 54 of file LineSurface.ipp.

View newest version in sPHENIX GitHub at line 54 of file LineSurface.ipp

References Acts::Test::transform.

Member Data Documentation

std::shared_ptr<const LineBounds> Acts::LineSurface::m_bounds

protected

bounds (shared)

Definition at line 261 of file LineSurface.hpp.

View newest version in sPHENIX GitHub at line 261 of file LineSurface.hpp

Referenced by operator=(), and Acts::StrawSurface::operator=().

friend Acts::LineSurface::Surface

private

Definition at line 32 of file LineSurface.hpp.

View newest version in sPHENIX GitHub at line 32 of file LineSurface.hpp

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

acts/blob/master/Core/include/Acts/Surfaces/LineSurface.hpp
acts/blob/master/Core/include/Acts/Surfaces/detail/LineSurface.ipp
acts/blob/master/Core/src/Surfaces/LineSurface.cpp

Public Member Functions

Protected Member Functions

Protected Attributes

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation