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Public Member Functions | Static Public Member Functions | Protected Attributes | List of all members
o2::trd::CoordinateTransformer Class Reference

#include <CoordinateTransformer.h>

Public Member Functions

std::array< float, 3 > Local2RCT (int det, float x, float y, float z)
 
std::array< float, 3 > Local2RCT (o2::trd::Hit &hit)
 Wrapper to conveniently calculate the row/column/time coordinate of a MC hit.
 
o2::trd::ChamberSpacePoint MakeSpacePoint (o2::trd::Hit &hit)
 
std::array< float, 3 > OrigLocal2RCT (int det, float x, float y, float z)
 
std::array< float, 3 > OrigLocal2RCT (o2::trd::Hit &hit)
 
float GetVdrift ()
 
void SetVdrift (float x)
 
float GetT0 ()
 
void SetT0 (float x)
 
float GetExB ()
 
void SetExB (float x)
 

Static Public Member Functions

static CoordinateTransformer * instance ()
 

Protected Attributes

o2::trd::Geometry * mGeo
 
float mVdrift {1.5625}
 drift velocity in cm/us
 
float mT0 {4.0}
 time offset of start of drift region
 
float mExB {0.140}
 tan(Lorentz angle): tan(8 deg) ~ 0.140
 

Detailed Description

CoordinateTransformer: translate between local spatial and pad/timebin coordinates

The intention of the CoordinateTransformer is to bundle calculations around coordinate transformations for the TRD and access to the calibration objects. So far it translates local spatial (x/y/z) coordinates within a TRD chamber (detector) to a tuple of pad row, pad column and time bin. In the future, it could translate e.g. track parameters to expected tracklet position and inclination. At the time of writing, only constant drift velocity, Lorentz angle and T0 are considered, and must be set by hand.

Definition at line 163 of file CoordinateTransformer.h.

Member Function Documentation

◆ GetExB()

float o2::trd::CoordinateTransformer::GetExB ( )
inline

Definition at line 207 of file CoordinateTransformer.h.

◆ GetT0()

float o2::trd::CoordinateTransformer::GetT0 ( )
inline

Definition at line 204 of file CoordinateTransformer.h.

◆ GetVdrift()

float o2::trd::CoordinateTransformer::GetVdrift ( )
inline

Definition at line 201 of file CoordinateTransformer.h.

◆ instance()

static CoordinateTransformer * o2::trd::CoordinateTransformer::instance ( )
inlinestatic

Definition at line 166 of file CoordinateTransformer.h.

◆ Local2RCT() [1/2]

std::array< float, 3 > CoordinateTransformer::Local2RCT ( int  det,
float  x,
float  y,
float  z 
)

Translate local spatial (x/y/z) coordinates within a TRD chamber (detector) to a tuple of pad row, column and time bin.

Local x,y,z coordinates follow the convention for MC hist and are assumed to be corrrected for alignment. The x-coordinate points in time direction, y in pad and z in row direction. The result is an array of three floating point numbers for row, column and timebin. Time and column can directly be compared with digit or tracklet data. The pad row is returned as a floating point number that indicates also the position within the padrow. The fractional part of the pad row is not available for digits and tracklets, and only

Definition at line 50 of file CoordinateTransformer.cxx.

◆ Local2RCT() [2/2]

std::array< float, 3 > o2::trd::CoordinateTransformer::Local2RCT ( o2::trd::Hit &  hit)
inline

Wrapper to conveniently calculate the row/column/time coordinate of a MC hit.

Definition at line 183 of file CoordinateTransformer.h.

◆ MakeSpacePoint()

o2::trd::ChamberSpacePoint CoordinateTransformer::MakeSpacePoint ( o2::trd::Hit &  hit)

Definition at line 132 of file CoordinateTransformer.cxx.

◆ OrigLocal2RCT() [1/2]

std::array< float, 3 > CoordinateTransformer::OrigLocal2RCT ( int  det,
float  x,
float  y,
float  z 
)

Legacy, less accurate method to convert local spatial to row/column/time coordinate. This method is only included for comparision, and should be removed in the future.

Definition at line 84 of file CoordinateTransformer.cxx.

◆ OrigLocal2RCT() [2/2]

std::array< float, 3 > o2::trd::CoordinateTransformer::OrigLocal2RCT ( o2::trd::Hit &  hit)
inline

Legacy, less accurate method to convert local spatial to row/column/time coordinate. This method is only included for comparision, and should be removed in the future.

Definition at line 196 of file CoordinateTransformer.h.

◆ SetExB()

void o2::trd::CoordinateTransformer::SetExB ( float  x)
inline

Definition at line 208 of file CoordinateTransformer.h.

◆ SetT0()

void o2::trd::CoordinateTransformer::SetT0 ( float  x)
inline

Definition at line 205 of file CoordinateTransformer.h.

◆ SetVdrift()

void o2::trd::CoordinateTransformer::SetVdrift ( float  x)
inline

Definition at line 202 of file CoordinateTransformer.h.

Member Data Documentation

◆ mExB

float o2::trd::CoordinateTransformer::mExB {0.140}
protected

tan(Lorentz angle): tan(8 deg) ~ 0.140

Definition at line 214 of file CoordinateTransformer.h.

◆ mGeo

o2::trd::Geometry* o2::trd::CoordinateTransformer::mGeo
protected

Definition at line 211 of file CoordinateTransformer.h.

◆ mT0

float o2::trd::CoordinateTransformer::mT0 {4.0}
protected

time offset of start of drift region

Definition at line 213 of file CoordinateTransformer.h.

◆ mVdrift

float o2::trd::CoordinateTransformer::mVdrift {1.5625}
protected

drift velocity in cm/us

Definition at line 212 of file CoordinateTransformer.h.

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