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#include "TrackingTools/PatternTools/interface/TwoTrackMinimumDistance.h"
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#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
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#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
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#include "FWCore/MessageLogger/interface/MessageLogger.h"
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#include "FWCore/Utilities/interface/Exception.h"
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#include "MagneticField/Engine/interface/MagneticField.h"
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using namespace std;
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namespace {
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inline GlobalPoint mean ( pair<GlobalPoint, GlobalPoint> pr ) {
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return GlobalPoint ( 0.5*(pr.first.basicVector() + pr.second.basicVector()) );
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}
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inline double dist ( pair<GlobalPoint, GlobalPoint> pr ) {
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return ( pr.first - pr.second ).mag();
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}
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}
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double TwoTrackMinimumDistance::firstAngle() const
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{
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if (!status_)
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throw cms::Exception("TrackingTools/PatternTools","TwoTrackMinimumDistance::could not compute track crossing. Check status before calling this method!");
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switch ( theCharge ) {
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case (hh): return theTTMDhh.firstAngle(); break;
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case (hl): return theTTMDhl.firstAngle(); break;
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case (ll): return theTTMDll.firstAngle(); break;
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}
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return 0;
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}
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double TwoTrackMinimumDistance::secondAngle() const
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{
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if (!status_)
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throw cms::Exception("TrackingTools/PatternTools","TwoTrackMinimumDistance::could not compute track crossing. Check status before calling this method!");
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switch ( theCharge ) {
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case (hh): return theTTMDhh.secondAngle(); break;
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case (hl): return theTTMDhl.secondAngle(); break;
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case (ll): return theTTMDll.secondAngle(); break;
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}
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return 0;
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}
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pair <double, double> TwoTrackMinimumDistance::pathLength() const
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{
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if (!status_)
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throw cms::Exception("TrackingTools/PatternTools","TwoTrackMinimumDistance::could not compute track crossing. Check status before calling this method!");
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switch ( theCharge ) {
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case (hh): return theTTMDhh.pathLength(); break;
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case (hl): return theTTMDhl.pathLength(); break;
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case (ll): return theTTMDll.pathLength(); break;
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}
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return std::pair<double,double>(0,0);
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}
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pair<GlobalPoint, GlobalPoint> TwoTrackMinimumDistance::points() const
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{
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if (!status_)
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throw cms::Exception("TrackingTools/PatternTools","TwoTrackMinimumDistance::could not compute track crossing. Check status before calling this method!");
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return points_;
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}
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bool
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TwoTrackMinimumDistance::calculate(const TrajectoryStateOnSurface & sta,
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const TrajectoryStateOnSurface & stb)
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{
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return calculate ( sta.globalParameters(), stb.globalParameters() );
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}
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bool
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TwoTrackMinimumDistance::calculate(const FreeTrajectoryState & sta,
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const FreeTrajectoryState & stb)
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{
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// pair<GlobalPoint, GlobalPoint> ret = theIniAlgo.points ( sta, stb );
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return calculate ( sta.parameters(), stb.parameters() );
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}
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bool
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TwoTrackMinimumDistance::calculate(const GlobalTrajectoryParameters & sta,
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const GlobalTrajectoryParameters & stb)
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{
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if ((sta.magneticField().inTesla(sta.position()).z() == 0.)||
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(stb.magneticField().inTesla(stb.position()).z() == 0.)) {
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status_ = pointsLineLine(sta, stb);
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} else if ( sta.charge() != 0. && stb.charge() != 0. ) {
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status_ = pointsHelixHelix(sta, stb);
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} else if ( sta.charge() == 0. && stb.charge() == 0. ) {
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status_ = pointsLineLine(sta, stb);
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} else {
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status_ = pointsHelixLine(sta, stb);
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}
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return status_;
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}
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bool
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TwoTrackMinimumDistance::pointsLineLine(const GlobalTrajectoryParameters & sta,
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const GlobalTrajectoryParameters & stb)
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{
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theCharge = ll;
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if (theTTMDll.calculate(sta, stb)) return false;
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points_ = theTTMDll.points();
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return true;
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}
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bool
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TwoTrackMinimumDistance::pointsHelixLine(const GlobalTrajectoryParameters & sta,
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const GlobalTrajectoryParameters & stb)
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{
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theCharge = hl;
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if (theTTMDhl.calculate(sta, stb, 0.000001)) return false;
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points_ = theTTMDhl.points();
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return true;
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}
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bool
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TwoTrackMinimumDistance::pointsHelixHelix(const GlobalTrajectoryParameters & sta,
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const GlobalTrajectoryParameters & stb)
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{
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if ( ( sta.position() - stb.position() ).mag2() < 1e-7f &&
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( sta.momentum() - stb.momentum() ).mag2() < 1e-7f &&
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sta.charge()==stb.charge()
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)
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{
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edm::LogWarning ( "TwoTrackMinimumDistance") << "comparing track with itself!";
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};
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theCharge = hh;
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if ( theModus == FastMode )
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{
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// first we try directly - in FastMode only ...
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if ( !(theTTMDhh.calculate ( sta, stb, .0001 )) )
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{
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points_ = theTTMDhh.points();
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return true;
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};
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};
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// okay. did not work. so we use CAIR, and then TTMD again.
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bool cairStat = theIniAlgo.calculate ( sta, stb );
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if (!cairStat) { // yes. CAIR may fail.
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edm::LogWarning ( "TwoTrackMinimumDistance" ) << "Computation HelixHelix::CAIR failed.";
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if ( theModus == SlowMode ) { // we can still try ttmd here.
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if ( !(theTTMDhh.calculate ( sta, stb, .0001 )) ) {
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points_ = theTTMDhh.points();
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return true;
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}
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};
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// we can try with more sloppy settings
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if ( !(theTTMDhh.calculate ( sta, stb, .1 )) ) {
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points_ = theTTMDhh.points();
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return true;
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}
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return false;
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edm::LogWarning ( "TwoTrackMinimumDistance" ) << "TwoTrackMinimumDistanceHelixHelix failed";
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};
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pair<GlobalTrajectoryParameters, GlobalTrajectoryParameters >
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ini = theIniAlgo.trajectoryParameters();
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pair<GlobalPoint, GlobalPoint> inip ( ini.first.position(),
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ini.second.position() );
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if ( theTTMDhh.calculate ( ini.first, ini.second, .0001 ) ) {
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points_ = inip;
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} else {
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points_ = theTTMDhh.points();
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// if we are still worse than CAIR, we use CAIR results.
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if ( dist ( points_ ) > dist ( inip ) ) points_ = inip;
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};
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return true;
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}
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GlobalPoint TwoTrackMinimumDistance::crossingPoint() const
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{
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return mean ( points_ );
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}
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float TwoTrackMinimumDistance::distance() const
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{
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return dist ( points_ );
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}
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