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TrajectoryStateClosestToPoint.cc
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TrajectoryStateClosestToPoint.cc
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#include "TrackingTools/TrajectoryState/interface/TrajectoryStateClosestToPoint.h"
// Private constructor
TrajectoryStateClosestToPoint::
TrajectoryStateClosestToPoint(const FTS& originalFTS, const GlobalPoint& referencePoint) :
theFTS(originalFTS), theFTSavailable(true), theRefPoint(referencePoint)
{
theParameters = perigeeConversions.ftsToPerigeeParameters(originalFTS, referencePoint, thePt);
if (theFTS.hasError()) {
thePerigeeError = perigeeConversions.ftsToPerigeeError(originalFTS);
errorIsAvailable = true;
}
else {
errorIsAvailable = false;
}
theField = &(originalFTS.parameters().magneticField());
}
/**
* Public constructor, which is used to convert perigee
* parameters to a FreeTrajectoryState. For the case where
* no error is provided.
*/
TrajectoryStateClosestToPoint::
TrajectoryStateClosestToPoint(const PerigeeTrajectoryParameters& perigeeParameters, double pt,
const GlobalPoint& referencePoint, const MagneticField* field) :
theField(field), theFTSavailable(false), theRefPoint(referencePoint),
theParameters(perigeeParameters), thePt( pt ), errorIsAvailable(false)
{}
/**
* Public constructor, which is used to convert perigee
* parameters to a FreeTrajectoryState. For the case where
* an error is provided.
*/
TrajectoryStateClosestToPoint::
TrajectoryStateClosestToPoint(const PerigeeTrajectoryParameters& perigeeParameters, double pt,
const PerigeeTrajectoryError& perigeeError, const GlobalPoint& referencePoint,
const MagneticField* field):
theField(field), theFTSavailable(false), theRefPoint(referencePoint), theParameters(perigeeParameters),
thePt( pt ), thePerigeeError(perigeeError), errorIsAvailable(true)
{}
void TrajectoryStateClosestToPoint::calculateFTS() const
{
GlobalTrajectoryParameters gtp(
perigeeConversions.positionFromPerigee(theParameters, theRefPoint),
perigeeConversions.momentumFromPerigee(theParameters, thePt, theRefPoint),
theParameters.charge(), theField);
if (errorIsAvailable) {
theFTS = FTS(gtp, perigeeConversions.curvilinearError(thePerigeeError, gtp));
} else {
theFTS = FTS(gtp);
}
theFTSavailable = true;
}

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